git-svn.perl

   1 #!/usr/bin/perl
   2 # Copyright (C) 2006, Eric Wong <normalperson@yhbt.net>
   3 # License: GPL v2 or later
   4 use 5.008;
   5 use warnings;
   6 use strict;
   7 use vars qw/    $AUTHOR $VERSION
   8                 $sha1 $sha1_short $_revision $_repository
   9                 $_q $_authors $_authors_prog %users/;
  10 $AUTHOR = 'Eric Wong <normalperson@yhbt.net>';
  11 $VERSION = '@@GIT_VERSION@@';
  12
  13 use Carp qw/croak/;
  14 use File::Basename qw/dirname basename/;
  15 use File::Path qw/mkpath/;
  16 use File::Spec;
  17 use Getopt::Long qw/:config gnu_getopt no_ignore_case auto_abbrev/;
  18 use Memoize;
  19
  20 use Git::SVN;
  21 use Git::SVN::Editor;
  22 use Git::SVN::Fetcher;
  23 use Git::SVN::Ra;
  24 use Git::SVN::Prompt;
  25 use Git::SVN::Log;
  26 use Git::SVN::Migration;
  27
  28 use Git::SVN::Utils qw(
  29         fatal
  30         can_compress
  31         canonicalize_path
  32         canonicalize_url
  33         join_paths
  34         add_path_to_url
  35         join_paths
  36 );
  37
  38 use Git qw(
  39         git_cmd_try
  40         command
  41         command_oneline
  42         command_noisy
  43         command_output_pipe
  44         command_close_pipe
  45         command_bidi_pipe
  46         command_close_bidi_pipe
  47 );
  48
  49 BEGIN {
  50         Memoize::memoize 'Git::config';
  51         Memoize::memoize 'Git::config_bool';
  52 }
  53
  54
  55 # From which subdir have we been invoked?
  56 my $cmd_dir_prefix = eval {
  57         command_oneline([qw/rev-parse --show-prefix/], STDERR => 0)
  58 } || '';
  59
  60 $Git::SVN::Ra::_log_window_size = 100;
  61
  62 if (! exists $ENV{SVN_SSH} && exists $ENV{GIT_SSH}) {
  63         $ENV{SVN_SSH} = $ENV{GIT_SSH};
  64 }
  65
  66 if (exists $ENV{SVN_SSH} && $^O eq 'msys') {
  67         $ENV{SVN_SSH} =~ s/\\/\\\\/g;
  68         $ENV{SVN_SSH} =~ s/(.*)/"$1"/;
  69 }
  70
  71 $Git::SVN::Log::TZ = $ENV{TZ};
  72 $ENV{TZ} = 'UTC';
  73 $| = 1; # unbuffer STDOUT
  74
  75 # All SVN commands do it.  Otherwise we may die on SIGPIPE when the remote
  76 # repository decides to close the connection which we expect to be kept alive.
  77 $SIG{PIPE} = 'IGNORE';
  78
  79 # Given a dot separated version number, "subtract" it from
  80 # the SVN::Core::VERSION; non-negaitive return means the SVN::Core
  81 # is at least at the version the caller asked for.
  82 sub compare_svn_version {
  83         my (@ours) = split(/\./, $SVN::Core::VERSION);
  84         my (@theirs) = split(/\./, $_[0]);
  85         my ($i, $diff);
  86
  87         for ($i = 0; $i < @ours && $i < @theirs; $i++) {
  88                 $diff = $ours[$i] - $theirs[$i];
  89                 return $diff if ($diff);
  90         }
  91         return 1 if ($i < @ours);
  92         return -1 if ($i < @theirs);
  93         return 0;
  94 }
  95
  96 sub _req_svn {
  97         require SVN::Core; # use()-ing this causes segfaults for me... *shrug*
  98         require SVN::Ra;
  99         require SVN::Delta;
 100         if (::compare_svn_version('1.1.0') < 0) {
 101                 fatal "Need SVN::Core 1.1.0 or better (got $SVN::Core::VERSION)";
 102         }
 103 }
 104
 105 $sha1 = qr/[a-f\d]{40}/;
 106 $sha1_short = qr/[a-f\d]{4,40}/;
 107 my ($_stdin, $_help, $_edit,
 108         $_message, $_file, $_branch_dest,
 109         $_template, $_shared,
 110         $_version, $_fetch_all, $_no_rebase, $_fetch_parent,
 111         $_before, $_after,
 112         $_merge, $_strategy, $_preserve_merges, $_dry_run, $_parents, $_local,
 113         $_prefix, $_no_checkout, $_url, $_verbose,
 114         $_commit_url, $_tag, $_merge_info, $_interactive, $_set_svn_props);
 115
 116 # This is a refactoring artifact so Git::SVN can get at this git-svn switch.
 117 sub opt_prefix { return $_prefix || '' }
 118
 119 $Git::SVN::Fetcher::_placeholder_filename = ".gitignore";
 120 $_q ||= 0;
 121 my %remote_opts = ( 'username=s' => \$Git::SVN::Prompt::_username,
 122                     'config-dir=s' => \$Git::SVN::Ra::config_dir,
 123                     'no-auth-cache' => \$Git::SVN::Prompt::_no_auth_cache,
 124                     'ignore-paths=s' => \$Git::SVN::Fetcher::_ignore_regex,
 125                     'include-paths=s' => \$Git::SVN::Fetcher::_include_regex,
 126                     'ignore-refs=s' => \$Git::SVN::Ra::_ignore_refs_regex );
 127 my %fc_opts = ( 'follow-parent|follow!' => \$Git::SVN::_follow_parent,
 128                 'authors-file|A=s' => \$_authors,
 129                 'authors-prog=s' => \$_authors_prog,
 130                 'repack:i' => \$Git::SVN::_repack,
 131                 'noMetadata' => \$Git::SVN::_no_metadata,
 132                 'useSvmProps' => \$Git::SVN::_use_svm_props,
 133                 'useSvnsyncProps' => \$Git::SVN::_use_svnsync_props,
 134                 'log-window-size=i' => \$Git::SVN::Ra::_log_window_size,
 135                 'no-checkout' => \$_no_checkout,
 136                 'quiet|q+' => \$_q,
 137                 'repack-flags|repack-args|repack-opts=s' =>
 138                    \$Git::SVN::_repack_flags,
 139                 'use-log-author' => \$Git::SVN::_use_log_author,
 140                 'add-author-from' => \$Git::SVN::_add_author_from,
 141                 'localtime' => \$Git::SVN::_localtime,
 142                 %remote_opts );
 143
 144 my ($_trunk, @_tags, @_branches, $_stdlayout);
 145 my %icv;
 146 my %init_opts = ( 'template=s' => \$_template, 'shared:s' => \$_shared,
 147                   'trunk|T=s' => \$_trunk, 'tags|t=s@' => \@_tags,
 148                   'branches|b=s@' => \@_branches, 'prefix=s' => \$_prefix,
 149                   'stdlayout|s' => \$_stdlayout,
 150                   'minimize-url|m!' => \$Git::SVN::_minimize_url,
 151                   'no-metadata' => sub { $icv{noMetadata} = 1 },
 152                   'use-svm-props' => sub { $icv{useSvmProps} = 1 },
 153                   'use-svnsync-props' => sub { $icv{useSvnsyncProps} = 1 },
 154                   'rewrite-root=s' => sub { $icv{rewriteRoot} = $_[1] },
 155                   'rewrite-uuid=s' => sub { $icv{rewriteUUID} = $_[1] },
 156                   %remote_opts );
 157 my %cmt_opts = ( 'edit|e' => \$_edit,
 158                 'rmdir' => \$Git::SVN::Editor::_rmdir,
 159                 'find-copies-harder' => \$Git::SVN::Editor::_find_copies_harder,
 160                 'l=i' => \$Git::SVN::Editor::_rename_limit,
 161                 'copy-similarity|C=i'=> \$Git::SVN::Editor::_cp_similarity
 162 );
 163
 164 my %cmd = (
 165         fetch => [ \&cmd_fetch, "Download new revisions from SVN",
 166                         { 'revision|r=s' => \$_revision,
 167                           'fetch-all|all' => \$_fetch_all,
 168                           'parent|p' => \$_fetch_parent,
 169                            %fc_opts } ],
 170         clone => [ \&cmd_clone, "Initialize and fetch revisions",
 171                         { 'revision|r=s' => \$_revision,
 172                           'preserve-empty-dirs' =>
 173                                 \$Git::SVN::Fetcher::_preserve_empty_dirs,
 174                           'placeholder-filename=s' =>
 175                                 \$Git::SVN::Fetcher::_placeholder_filename,
 176                            %fc_opts, %init_opts } ],
 177         init => [ \&cmd_init, "Initialize a repo for tracking" .
 178                           " (requires URL argument)",
 179                           \%init_opts ],
 180         'multi-init' => [ \&cmd_multi_init,
 181                           "Deprecated alias for ".
 182                           "'$0 init -T<trunk> -b<branches> -t<tags>'",
 183                           \%init_opts ],
 184         dcommit => [ \&cmd_dcommit,
 185                      'Commit several diffs to merge with upstream',
 186                         { 'merge|m|M' => \$_merge,
 187                           'strategy|s=s' => \$_strategy,
 188                           'verbose|v' => \$_verbose,
 189                           'dry-run|n' => \$_dry_run,
 190                           'fetch-all|all' => \$_fetch_all,
 191                           'commit-url=s' => \$_commit_url,
 192                           'set-svn-props=s' => \$_set_svn_props,
 193                           'revision|r=i' => \$_revision,
 194                           'no-rebase' => \$_no_rebase,
 195                           'mergeinfo=s' => \$_merge_info,
 196                           'interactive|i' => \$_interactive,
 197                         %cmt_opts, %fc_opts } ],
 198         branch => [ \&cmd_branch,
 199                     'Create a branch in the SVN repository',
 200                     { 'message|m=s' => \$_message,
 201                       'destination|d=s' => \$_branch_dest,
 202                       'dry-run|n' => \$_dry_run,
 203                       'parents' => \$_parents,
 204                       'tag|t' => \$_tag,
 205                       'username=s' => \$Git::SVN::Prompt::_username,
 206                       'commit-url=s' => \$_commit_url } ],
 207         tag => [ sub { $_tag = 1; cmd_branch(@_) },
 208                  'Create a tag in the SVN repository',
 209                  { 'message|m=s' => \$_message,
 210                    'destination|d=s' => \$_branch_dest,
 211                    'dry-run|n' => \$_dry_run,
 212                    'parents' => \$_parents,
 213                    'username=s' => \$Git::SVN::Prompt::_username,
 214                    'commit-url=s' => \$_commit_url } ],
 215         'set-tree' => [ \&cmd_set_tree,
 216                         "Set an SVN repository to a git tree-ish",
 217                         { 'stdin' => \$_stdin, %cmt_opts, %fc_opts, } ],
 218         'create-ignore' => [ \&cmd_create_ignore,
 219                              'Create a .gitignore per svn:ignore',
 220                              { 'revision|r=i' => \$_revision
 221                              } ],
 222         'mkdirs' => [ \&cmd_mkdirs ,
 223                       "recreate empty directories after a checkout",
 224                       { 'revision|r=i' => \$_revision } ],
 225         'propget' => [ \&cmd_propget,
 226                        'Print the value of a property on a file or directory',
 227                        { 'revision|r=i' => \$_revision } ],
 228         'propset' => [ \&cmd_propset,
 229                        'Set the value of a property on a file or directory - will be set on commit',
 230                        {} ],
 231         'proplist' => [ \&cmd_proplist,
 232                        'List all properties of a file or directory',
 233                        { 'revision|r=i' => \$_revision } ],
 234         'show-ignore' => [ \&cmd_show_ignore, "Show svn:ignore listings",
 235                         { 'revision|r=i' => \$_revision
 236                         } ],
 237         'show-externals' => [ \&cmd_show_externals, "Show svn:externals listings",
 238                         { 'revision|r=i' => \$_revision
 239                         } ],
 240         'multi-fetch' => [ \&cmd_multi_fetch,
 241                            "Deprecated alias for $0 fetch --all",
 242                            { 'revision|r=s' => \$_revision, %fc_opts } ],
 243         'migrate' => [ sub { },
 244                        # no-op, we automatically run this anyways,
 245                        'Migrate configuration/metadata/layout from
 246                         previous versions of git-svn',
 247                        { 'minimize' => \$Git::SVN::Migration::_minimize,
 248                          %remote_opts } ],
 249         'log' => [ \&Git::SVN::Log::cmd_show_log, 'Show commit logs',
 250                         { 'limit=i' => \$Git::SVN::Log::limit,
 251                           'revision|r=s' => \$_revision,
 252                           'verbose|v' => \$Git::SVN::Log::verbose,
 253                           'incremental' => \$Git::SVN::Log::incremental,
 254                           'oneline' => \$Git::SVN::Log::oneline,
 255                           'show-commit' => \$Git::SVN::Log::show_commit,
 256                           'non-recursive' => \$Git::SVN::Log::non_recursive,
 257                           'authors-file|A=s' => \$_authors,
 258                           'color' => \$Git::SVN::Log::color,
 259                           'pager=s' => \$Git::SVN::Log::pager
 260                         } ],
 261         'find-rev' => [ \&cmd_find_rev,
 262                         "Translate between SVN revision numbers and tree-ish",
 263                         { 'B|before' => \$_before,
 264                           'A|after' => \$_after } ],
 265         'rebase' => [ \&cmd_rebase, "Fetch and rebase your working directory",
 266                         { 'merge|m|M' => \$_merge,
 267                           'verbose|v' => \$_verbose,
 268                           'strategy|s=s' => \$_strategy,
 269                           'local|l' => \$_local,
 270                           'fetch-all|all' => \$_fetch_all,
 271                           'dry-run|n' => \$_dry_run,
 272                           'preserve-merges|p' => \$_preserve_merges,
 273                           %fc_opts } ],
 274         'commit-diff' => [ \&cmd_commit_diff,
 275                            'Commit a diff between two trees',
 276                         { 'message|m=s' => \$_message,
 277                           'file|F=s' => \$_file,
 278                           'revision|r=s' => \$_revision,
 279                         %cmt_opts } ],
 280         'info' => [ \&cmd_info,
 281                     "Show info about the latest SVN revision
 282                      on the current branch",
 283                     { 'url' => \$_url, } ],
 284         'blame' => [ \&Git::SVN::Log::cmd_blame,
 285                     "Show what revision and author last modified each line of a file",
 286                     { 'git-format' => \$Git::SVN::Log::_git_format } ],
 287         'reset' => [ \&cmd_reset,
 288                      "Undo fetches back to the specified SVN revision",
 289                      { 'revision|r=s' => \$_revision,
 290                        'parent|p' => \$_fetch_parent } ],
 291         'gc' => [ \&cmd_gc,
 292                   "Compress unhandled.log files in .git/svn and remove " .
 293                   "index files in .git/svn",
 294                 {} ],
 295 );
 296
 297 package FakeTerm;
 298 sub new {
 299         my ($class, $reason) = @_;
 300         return bless \$reason, shift;
 301 }
 302 sub readline {
 303         my $self = shift;
 304         die "Cannot use readline on FakeTerm: $$self";
 305 }
 306 package main;
 307
 308 my $term;
 309 sub term_init {
 310         $term = eval {
 311                 require Term::ReadLine;
 312                 $ENV{"GIT_SVN_NOTTY"}
 313                         ? new Term::ReadLine 'git-svn', \*STDIN, \*STDOUT
 314                         : new Term::ReadLine 'git-svn';
 315         };
 316         if ($@) {
 317                 $term = new FakeTerm "$@: going non-interactive";
 318         }
 319 }
 320
 321 my $cmd;
 322 for (my $i = 0; $i < @ARGV; $i++) {
 323         if (defined $cmd{$ARGV[$i]}) {
 324                 $cmd = $ARGV[$i];
 325                 splice @ARGV, $i, 1;
 326                 last;
 327         } elsif ($ARGV[$i] eq 'help') {
 328                 $cmd = $ARGV[$i+1];
 329                 usage(0);
 330         }
 331 };
 332
 333 # make sure we're always running at the top-level working directory
 334 if ($cmd && $cmd =~ /(?:clone|init|multi-init)$/) {
 335         $ENV{GIT_DIR} ||= ".git";
 336         # catch the submodule case
 337         if (-f $ENV{GIT_DIR}) {
 338                 open(my $fh, '<', $ENV{GIT_DIR}) or
 339                         die "failed to open $ENV{GIT_DIR}: $!\n";
 340                 $ENV{GIT_DIR} = $1 if <$fh> =~ /^gitdir: (.+)$/;
 341         }
 342 } else {
 343         my ($git_dir, $cdup);
 344         git_cmd_try {
 345                 $git_dir = command_oneline([qw/rev-parse --git-dir/]);
 346         } "Unable to find .git directory\n";
 347         git_cmd_try {
 348                 $cdup = command_oneline(qw/rev-parse --show-cdup/);
 349                 chomp $cdup if ($cdup);
 350                 $cdup = "." unless ($cdup && length $cdup);
 351         } "Already at toplevel, but $git_dir not found\n";
 352         $ENV{GIT_DIR} = $git_dir;
 353         chdir $cdup or die "Unable to chdir up to '$cdup'\n";
 354         $_repository = Git->repository(Repository => $ENV{GIT_DIR});
 355 }
 356
 357 my %opts = %{$cmd{$cmd}->[2]} if (defined $cmd);
 358
 359 read_git_config(\%opts);
 360 if ($cmd && ($cmd eq 'log' || $cmd eq 'blame')) {
 361         Getopt::Long::Configure('pass_through');
 362 }
 363 my $rv = GetOptions(%opts, 'h|H' => \$_help, 'version|V' => \$_version,
 364                     'minimize-connections' => \$Git::SVN::Migration::_minimize,
 365                     'id|i=s' => \$Git::SVN::default_ref_id,
 366                     'svn-remote|remote|R=s' => sub {
 367                        $Git::SVN::no_reuse_existing = 1;
 368                        $Git::SVN::default_repo_id = $_[1] });
 369 exit 1 if (!$rv && $cmd && $cmd ne 'log');
 370
 371 usage(0) if $_help;
 372 version() if $_version;
 373 usage(1) unless defined $cmd;
 374 load_authors() if $_authors;
 375 if (defined $_authors_prog) {
 376         $_authors_prog = "'" . File::Spec->rel2abs($_authors_prog) . "'";
 377 }
 378
 379 unless ($cmd =~ /^(?:clone|init|multi-init|commit-diff)$/) {
 380         Git::SVN::Migration::migration_check();
 381 }
 382 Git::SVN::init_vars();
 383 eval {
 384         Git::SVN::verify_remotes_sanity();
 385         $cmd{$cmd}->[0]->(@ARGV);
 386         post_fetch_checkout();
 387 };
 388 fatal $@ if $@;
 389 exit 0;
 390
 391 ####################### primary functions ######################
 392 sub usage {
 393         my $exit = shift || 0;
 394         my $fd = $exit ? \*STDERR : \*STDOUT;
 395         print $fd <<"";
 396 git-svn - bidirectional operations between a single Subversion tree and git
 397 usage: git svn <command> [options] [arguments]\n
 398
 399         print $fd "Available commands:\n" unless $cmd;
 400
 401         foreach (sort keys %cmd) {
 402                 next if $cmd && $cmd ne $_;
 403                 next if /^multi-/; # don't show deprecated commands
 404                 print $fd '  ',pack('A17',$_),$cmd{$_}->[1],"\n";
 405                 foreach (sort keys %{$cmd{$_}->[2]}) {
 406                         # mixed-case options are for .git/config only
 407                         next if /[A-Z]/ && /^[a-z]+$/i;
 408                         # prints out arguments as they should be passed:
 409                         my $x = s#[:=]s$## ? '<arg>' : s#[:=]i$## ? '<num>' : '';
 410                         print $fd ' ' x 21, join(', ', map { length $_ > 1 ?
 411                                                         "--$_" : "-$_" }
 412                                                 split /\|/,$_)," $x\n";
 413                 }
 414         }
 415         print $fd <<"";
 416 \nGIT_SVN_ID may be set in the environment or via the --id/-i switch to an
 417 arbitrary identifier if you're tracking multiple SVN branches/repositories in
 418 one git repository and want to keep them separate.  See git-svn(1) for more
 419 information.
 420
 421         exit $exit;
 422 }
 423
 424 sub version {
 425         ::_req_svn();
 426         print "git-svn version $VERSION (svn $SVN::Core::VERSION)\n";
 427         exit 0;
 428 }
 429
 430 sub ask {
 431         my ($prompt, %arg) = @_;
 432         my $valid_re = $arg{valid_re};
 433         my $default = $arg{default};
 434         my $resp;
 435         my $i = 0;
 436         term_init() unless $term;
 437
 438         if ( !( defined($term->IN)
 439             && defined( fileno($term->IN) )
 440             && defined( $term->OUT )
 441             && defined( fileno($term->OUT) ) ) ){
 442                 return defined($default) ? $default : undef;
 443         }
 444
 445         while ($i++ < 10) {
 446                 $resp = $term->readline($prompt);
 447                 if (!defined $resp) { # EOF
 448                         print "\n";
 449                         return defined $default ? $default : undef;
 450                 }
 451                 if ($resp eq '' and defined $default) {
 452                         return $default;
 453                 }
 454                 if (!defined $valid_re or $resp =~ /$valid_re/) {
 455                         return $resp;
 456                 }
 457         }
 458         return undef;
 459 }
 460
 461 sub do_git_init_db {
 462         unless (-d $ENV{GIT_DIR}) {
 463                 my @init_db = ('init');
 464                 push @init_db, "--template=$_template" if defined $_template;
 465                 if (defined $_shared) {
 466                         if ($_shared =~ /[a-z]/) {
 467                                 push @init_db, "--shared=$_shared";
 468                         } else {
 469                                 push @init_db, "--shared";
 470                         }
 471                 }
 472                 command_noisy(@init_db);
 473                 $_repository = Git->repository(Repository => ".git");
 474         }
 475         my $set;
 476         my $pfx = "svn-remote.$Git::SVN::default_repo_id";
 477         foreach my $i (keys %icv) {
 478                 die "'$set' and '$i' cannot both be set\n" if $set;
 479                 next unless defined $icv{$i};
 480                 command_noisy('config', "$pfx.$i", $icv{$i});
 481                 $set = $i;
 482         }
 483         my $ignore_paths_regex = \$Git::SVN::Fetcher::_ignore_regex;
 484         command_noisy('config', "$pfx.ignore-paths", $$ignore_paths_regex)
 485                 if defined $$ignore_paths_regex;
 486         my $include_paths_regex = \$Git::SVN::Fetcher::_include_regex;
 487         command_noisy('config', "$pfx.include-paths", $$include_paths_regex)
 488                 if defined $$include_paths_regex;
 489         my $ignore_refs_regex = \$Git::SVN::Ra::_ignore_refs_regex;
 490         command_noisy('config', "$pfx.ignore-refs", $$ignore_refs_regex)
 491                 if defined $$ignore_refs_regex;
 492
 493         if (defined $Git::SVN::Fetcher::_preserve_empty_dirs) {
 494                 my $fname = \$Git::SVN::Fetcher::_placeholder_filename;
 495                 command_noisy('config', "$pfx.preserve-empty-dirs", 'true');
 496                 command_noisy('config', "$pfx.placeholder-filename", $$fname);
 497         }
 498 }
 499
 500 sub init_subdir {
 501         my $repo_path = shift or return;
 502         mkpath([$repo_path]) unless -d $repo_path;
 503         chdir $repo_path or die "Couldn't chdir to $repo_path: $!\n";
 504         $ENV{GIT_DIR} = '.git';
 505         $_repository = Git->repository(Repository => $ENV{GIT_DIR});
 506 }
 507
 508 sub cmd_clone {
 509         my ($url, $path) = @_;
 510         if (!defined $path &&
 511             (defined $_trunk || @_branches || @_tags ||
 512              defined $_stdlayout) &&
 513             $url !~ m#^[a-z\+]+://#) {
 514                 $path = $url;
 515         }
 516         $path = basename($url) if !defined $path || !length $path;
 517         my $authors_absolute = $_authors ? File::Spec->rel2abs($_authors) : "";
 518         cmd_init($url, $path);
 519         command_oneline('config', 'svn.authorsfile', $authors_absolute)
 520             if $_authors;
 521         Git::SVN::fetch_all($Git::SVN::default_repo_id);
 522 }
 523
 524 sub cmd_init {
 525         if (defined $_stdlayout) {
 526                 $_trunk = 'trunk' if (!defined $_trunk);
 527                 @_tags = 'tags' if (! @_tags);
 528                 @_branches = 'branches' if (! @_branches);
 529         }
 530         if (defined $_trunk || @_branches || @_tags) {
 531                 return cmd_multi_init(@_);
 532         }
 533         my $url = shift or die "SVN repository location required ",
 534                                "as a command-line argument\n";
 535         $url = canonicalize_url($url);
 536         init_subdir(@_);
 537         do_git_init_db();
 538
 539         if ($Git::SVN::_minimize_url eq 'unset') {
 540                 $Git::SVN::_minimize_url = 0;
 541         }
 542
 543         Git::SVN->init($url);
 544 }
 545
 546 sub cmd_fetch {
 547         if (grep /^\d+=./, @_) {
 548                 die "'<rev>=<commit>' fetch arguments are ",
 549                     "no longer supported.\n";
 550         }
 551         my ($remote) = @_;
 552         if (@_ > 1) {
 553                 die "usage: $0 fetch [--all] [--parent] [svn-remote]\n";
 554         }
 555         $Git::SVN::no_reuse_existing = undef;
 556         if ($_fetch_parent) {
 557                 my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
 558                 unless ($gs) {
 559                         die "Unable to determine upstream SVN information from ",
 560                             "working tree history\n";
 561                 }
 562                 # just fetch, don't checkout.
 563                 $_no_checkout = 'true';
 564                 $_fetch_all ? $gs->fetch_all : $gs->fetch;
 565         } elsif ($_fetch_all) {
 566                 cmd_multi_fetch();
 567         } else {
 568                 $remote ||= $Git::SVN::default_repo_id;
 569                 Git::SVN::fetch_all($remote, Git::SVN::read_all_remotes());
 570         }
 571 }
 572
 573 sub cmd_set_tree {
 574         my (@commits) = @_;
 575         if ($_stdin || !@commits) {
 576                 print "Reading from stdin...\n";
 577                 @commits = ();
 578                 while (<STDIN>) {
 579                         if (/\b($sha1_short)\b/o) {
 580                                 unshift @commits, $1;
 581                         }
 582                 }
 583         }
 584         my @revs;
 585         foreach my $c (@commits) {
 586                 my @tmp = command('rev-parse',$c);
 587                 if (scalar @tmp == 1) {
 588                         push @revs, $tmp[0];
 589                 } elsif (scalar @tmp > 1) {
 590                         push @revs, reverse(command('rev-list',@tmp));
 591                 } else {
 592                         fatal "Failed to rev-parse $c";
 593                 }
 594         }
 595         my $gs = Git::SVN->new;
 596         my ($r_last, $cmt_last) = $gs->last_rev_commit;
 597         $gs->fetch;
 598         if (defined $gs->{last_rev} && $r_last != $gs->{last_rev}) {
 599                 fatal "There are new revisions that were fetched ",
 600                       "and need to be merged (or acknowledged) ",
 601                       "before committing.\nlast rev: $r_last\n",
 602                       " current: $gs->{last_rev}";
 603         }
 604         $gs->set_tree($_) foreach @revs;
 605         print "Done committing ",scalar @revs," revisions to SVN\n";
 606         unlink $gs->{index};
 607 }
 608
 609 sub split_merge_info_range {
 610         my ($range) = @_;
 611         if ($range =~ /(\d+)-(\d+)/) {
 612                 return (int($1), int($2));
 613         } else {
 614                 return (int($range), int($range));
 615         }
 616 }
 617
 618 sub combine_ranges {
 619         my ($in) = @_;
 620
 621         my @fnums = ();
 622         my @arr = split(/,/, $in);
 623         for my $element (@arr) {
 624                 my ($start, $end) = split_merge_info_range($element);
 625                 push @fnums, $start;
 626         }
 627
 628         my @sorted = @arr [ sort {
 629                 $fnums[$a] <=> $fnums[$b]
 630         } 0..$#arr ];
 631
 632         my @return = ();
 633         my $last = -1;
 634         my $first = -1;
 635         for my $element (@sorted) {
 636                 my ($start, $end) = split_merge_info_range($element);
 637
 638                 if ($last == -1) {
 639                         $first = $start;
 640                         $last = $end;
 641                         next;
 642                 }
 643                 if ($start <= $last+1) {
 644                         if ($end > $last) {
 645                                 $last = $end;
 646                         }
 647                         next;
 648                 }
 649                 if ($first == $last) {
 650                         push @return, "$first";
 651                 } else {
 652                         push @return, "$first-$last";
 653                 }
 654                 $first = $start;
 655                 $last = $end;
 656         }
 657
 658         if ($first != -1) {
 659                 if ($first == $last) {
 660                         push @return, "$first";
 661                 } else {
 662                         push @return, "$first-$last";
 663                 }
 664         }
 665
 666         return join(',', @return);
 667 }
 668
 669 sub merge_revs_into_hash {
 670         my ($hash, $minfo) = @_;
 671         my @lines = split(' ', $minfo);
 672
 673         for my $line (@lines) {
 674                 my ($branchpath, $revs) = split(/:/, $line);
 675
 676                 if (exists($hash->{$branchpath})) {
 677                         # Merge the two revision sets
 678                         my $combined = "$hash->{$branchpath},$revs";
 679                         $hash->{$branchpath} = combine_ranges($combined);
 680                 } else {
 681                         # Just do range combining for consolidation
 682                         $hash->{$branchpath} = combine_ranges($revs);
 683                 }
 684         }
 685 }
 686
 687 sub merge_merge_info {
 688         my ($mergeinfo_one, $mergeinfo_two, $ignore_branch) = @_;
 689         my %result_hash = ();
 690
 691         merge_revs_into_hash(\%result_hash, $mergeinfo_one);
 692         merge_revs_into_hash(\%result_hash, $mergeinfo_two);
 693
 694         delete $result_hash{$ignore_branch} if $ignore_branch;
 695
 696         my $result = '';
 697         # Sort below is for consistency's sake
 698         for my $branchname (sort keys(%result_hash)) {
 699                 my $revlist = $result_hash{$branchname};
 700                 $result .= "$branchname:$revlist\n"
 701         }
 702         return $result;
 703 }
 704
 705 sub populate_merge_info {
 706         my ($d, $gs, $uuid, $linear_refs, $rewritten_parent) = @_;
 707
 708         my %parentshash;
 709         read_commit_parents(\%parentshash, $d);
 710         my @parents = @{$parentshash{$d}};
 711         if ($#parents > 0) {
 712                 # Merge commit
 713                 my $all_parents_ok = 1;
 714                 my $aggregate_mergeinfo = '';
 715                 my $rooturl = $gs->repos_root;
 716                 my ($target_branch) = $gs->full_pushurl =~ /^\Q$rooturl\E(.*)/;
 717
 718                 if (defined($rewritten_parent)) {
 719                         # Replace first parent with newly-rewritten version
 720                         shift @parents;
 721                         unshift @parents, $rewritten_parent;
 722                 }
 723
 724                 foreach my $parent (@parents) {
 725                         my ($branchurl, $svnrev, $paruuid) =
 726                                 cmt_metadata($parent);
 727
 728                         unless (defined($svnrev)) {
 729                                 # Should have been caught be preflight check
 730                                 fatal "merge commit $d has ancestor $parent, but that change "
 731                      ."does not have git-svn metadata!";
 732                         }
 733                         unless ($branchurl =~ /^\Q$rooturl\E(.*)/) {
 734                                 fatal "commit $parent git-svn metadata changed mid-run!";
 735                         }
 736                         my $branchpath = $1;
 737
 738                         my $ra = Git::SVN::Ra->new($branchurl);
 739                         my (undef, undef, $props) =
 740                                 $ra->get_dir(canonicalize_path("."), $svnrev);
 741                         my $par_mergeinfo = $props->{'svn:mergeinfo'};
 742                         unless (defined $par_mergeinfo) {
 743                                 $par_mergeinfo = '';
 744                         }
 745                         # Merge previous mergeinfo values
 746                         $aggregate_mergeinfo =
 747                                 merge_merge_info($aggregate_mergeinfo,
 748                                                                 $par_mergeinfo,
 749                                                                 $target_branch);
 750
 751                         next if $parent eq $parents[0]; # Skip first parent
 752                         # Add new changes being placed in tree by merge
 753                         my @cmd = (qw/rev-list --reverse/,
 754                                            $parent, qw/--not/);
 755                         foreach my $par (@parents) {
 756                                 unless ($par eq $parent) {
 757                                         push @cmd, $par;
 758                                 }
 759                         }
 760                         my @revsin = ();
 761                         my ($revlist, $ctx) = command_output_pipe(@cmd);
 762                         while (<$revlist>) {
 763                                 my $irev = $_;
 764                                 chomp $irev;
 765                                 my (undef, $csvnrev, undef) =
 766                                         cmt_metadata($irev);
 767                                 unless (defined $csvnrev) {
 768                                         # A child is missing SVN annotations...
 769                                         # this might be OK, or might not be.
 770                                         warn "W:child $irev is merged into revision "
 771                                                  ."$d but does not have git-svn metadata. "
 772                                                  ."This means git-svn cannot determine the "
 773                                                  ."svn revision numbers to place into the "
 774                                                  ."svn:mergeinfo property. You must ensure "
 775                                                  ."a branch is entirely committed to "
 776                                                  ."SVN before merging it in order for "
 777                                                  ."svn:mergeinfo population to function "
 778                                                  ."properly";
 779                                 }
 780                                 push @revsin, $csvnrev;
 781                         }
 782                         command_close_pipe($revlist, $ctx);
 783
 784                         last unless $all_parents_ok;
 785
 786                         # We now have a list of all SVN revnos which are
 787                         # merged by this particular parent. Integrate them.
 788                         next if $#revsin == -1;
 789                         my $newmergeinfo = "$branchpath:" . join(',', @revsin);
 790                         $aggregate_mergeinfo =
 791                                 merge_merge_info($aggregate_mergeinfo,
 792                                                                 $newmergeinfo,
 793                                                                 $target_branch);
 794                 }
 795                 if ($all_parents_ok and $aggregate_mergeinfo) {
 796                         return $aggregate_mergeinfo;
 797                 }
 798         }
 799
 800         return undef;
 801 }
 802
 803 sub dcommit_rebase {
 804         my ($is_last, $current, $fetched_ref, $svn_error) = @_;
 805         my @diff;
 806
 807         if ($svn_error) {
 808                 print STDERR "\nERROR from SVN:\n",
 809                                 $svn_error->expanded_message, "\n";
 810         }
 811         unless ($_no_rebase) {
 812                 # we always want to rebase against the current HEAD,
 813                 # not any head that was passed to us
 814                 @diff = command('diff-tree', $current,
 815                            $fetched_ref, '--');
 816                 my @finish;
 817                 if (@diff) {
 818                         @finish = rebase_cmd();
 819                         print STDERR "W: $current and ", $fetched_ref,
 820                                      " differ, using @finish:\n",
 821                                      join("\n", @diff), "\n";
 822                 } elsif ($is_last) {
 823                         print "No changes between ", $current, " and ",
 824                               $fetched_ref,
 825                               "\nResetting to the latest ",
 826                               $fetched_ref, "\n";
 827                         @finish = qw/reset --mixed/;
 828                 }
 829                 command_noisy(@finish, $fetched_ref) if @finish;
 830         }
 831         if ($svn_error) {
 832                 die "ERROR: Not all changes have been committed into SVN"
 833                         .($_no_rebase ? ".\n" : ", however the committed\n"
 834                         ."ones (if any) seem to be successfully integrated "
 835                         ."into the working tree.\n")
 836                         ."Please see the above messages for details.\n";
 837         }
 838         return @diff;
 839 }
 840
 841 sub cmd_dcommit {
 842         my $head = shift;
 843         command_noisy(qw/update-index --refresh/);
 844         git_cmd_try { command_oneline(qw/diff-index --quiet HEAD --/) }
 845                 'Cannot dcommit with a dirty index.  Commit your changes first, '
 846                 . "or stash them with `git stash'.\n";
 847         $head ||= 'HEAD';
 848
 849         my $old_head;
 850         if ($head ne 'HEAD') {
 851                 $old_head = eval {
 852                         command_oneline([qw/symbolic-ref -q HEAD/])
 853                 };
 854                 if ($old_head) {
 855                         $old_head =~ s{^refs/heads/}{};
 856                 } else {
 857                         $old_head = eval { command_oneline(qw/rev-parse HEAD/) };
 858                 }
 859                 command(['checkout', $head], STDERR => 0);
 860         }
 861
 862         my @refs;
 863         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD', \@refs);
 864         unless ($gs) {
 865                 die "Unable to determine upstream SVN information from ",
 866                     "$head history.\nPerhaps the repository is empty.";
 867         }
 868
 869         if (defined $_commit_url) {
 870                 $url = $_commit_url;
 871         } else {
 872                 $url = eval { command_oneline('config', '--get',
 873                               "svn-remote.$gs->{repo_id}.commiturl") };
 874                 if (!$url) {
 875                         $url = $gs->full_pushurl
 876                 }
 877         }
 878
 879         my $last_rev = $_revision if defined $_revision;
 880         if ($url) {
 881                 print "Committing to $url ...\n";
 882         }
 883         my ($linear_refs, $parents) = linearize_history($gs, \@refs);
 884         if ($_no_rebase && scalar(@$linear_refs) > 1) {
 885                 warn "Attempting to commit more than one change while ",
 886                      "--no-rebase is enabled.\n",
 887                      "If these changes depend on each other, re-running ",
 888                      "without --no-rebase may be required."
 889         }
 890
 891         if (defined $_interactive){
 892                 my $ask_default = "y";
 893                 foreach my $d (@$linear_refs){
 894                         my ($fh, $ctx) = command_output_pipe(qw(show --summary), "$d");
 895                         while (<$fh>){
 896                                 print $_;
 897                         }
 898                         command_close_pipe($fh, $ctx);
 899                         $_ = ask("Commit this patch to SVN? ([y]es (default)|[n]o|[q]uit|[a]ll): ",
 900                                  valid_re => qr/^(?:yes|y|no|n|quit|q|all|a)/i,
 901                                  default => $ask_default);
 902                         die "Commit this patch reply required" unless defined $_;
 903                         if (/^[nq]/i) {
 904                                 exit(0);
 905                         } elsif (/^a/i) {
 906                                 last;
 907                         }
 908                 }
 909         }
 910
 911         my $expect_url = $url;
 912
 913         my $push_merge_info = eval {
 914                 command_oneline(qw/config --get svn.pushmergeinfo/)
 915                 };
 916         if (not defined($push_merge_info)
 917                         or $push_merge_info eq "false"
 918                         or $push_merge_info eq "no"
 919                         or $push_merge_info eq "never") {
 920                 $push_merge_info = 0;
 921         }
 922
 923         unless (defined($_merge_info) || ! $push_merge_info) {
 924                 # Preflight check of changes to ensure no issues with mergeinfo
 925                 # This includes check for uncommitted-to-SVN parents
 926                 # (other than the first parent, which we will handle),
 927                 # information from different SVN repos, and paths
 928                 # which are not underneath this repository root.
 929                 my $rooturl = $gs->repos_root;
 930                 foreach my $d (@$linear_refs) {
 931                         my %parentshash;
 932                         read_commit_parents(\%parentshash, $d);
 933                         my @realparents = @{$parentshash{$d}};
 934                         if ($#realparents > 0) {
 935                                 # Merge commit
 936                                 shift @realparents; # Remove/ignore first parent
 937                                 foreach my $parent (@realparents) {
 938                                         my ($branchurl, $svnrev, $paruuid) = cmt_metadata($parent);
 939                                         unless (defined $paruuid) {
 940                                                 # A parent is missing SVN annotations...
 941                                                 # abort the whole operation.
 942                                                 fatal "$parent is merged into revision $d, "
 943                                                          ."but does not have git-svn metadata. "
 944                                                          ."Either dcommit the branch or use a "
 945                                                          ."local cherry-pick, FF merge, or rebase "
 946                                                          ."instead of an explicit merge commit.";
 947                                         }
 948
 949                                         unless ($paruuid eq $uuid) {
 950                                                 # Parent has SVN metadata from different repository
 951                                                 fatal "merge parent $parent for change $d has "
 952                                                          ."git-svn uuid $paruuid, while current change "
 953                                                          ."has uuid $uuid!";
 954                                         }
 955
 956                                         unless ($branchurl =~ /^\Q$rooturl\E(.*)/) {
 957                                                 # This branch is very strange indeed.
 958                                                 fatal "merge parent $parent for $d is on branch "
 959                                                          ."$branchurl, which is not under the "
 960                                                          ."git-svn root $rooturl!";
 961                                         }
 962                                 }
 963                         }
 964                 }
 965         }
 966
 967         my $rewritten_parent;
 968         my $current_head = command_oneline(qw/rev-parse HEAD/);
 969         Git::SVN::remove_username($expect_url);
 970         if (defined($_merge_info)) {
 971                 $_merge_info =~ tr{ }{\n};
 972         }
 973         while (1) {
 974                 my $d = shift @$linear_refs or last;
 975                 unless (defined $last_rev) {
 976                         (undef, $last_rev, undef) = cmt_metadata("$d~1");
 977                         unless (defined $last_rev) {
 978                                 fatal "Unable to extract revision information ",
 979                                       "from commit $d~1";
 980                         }
 981                 }
 982                 if ($_dry_run) {
 983                         print "diff-tree $d~1 $d\n";
 984                 } else {
 985                         my $cmt_rev;
 986
 987                         unless (defined($_merge_info) || ! $push_merge_info) {
 988                                 $_merge_info = populate_merge_info($d, $gs,
 989                                                              $uuid,
 990                                                              $linear_refs,
 991                                                              $rewritten_parent);
 992                         }
 993
 994                         my %ed_opts = ( r => $last_rev,
 995                                         log => get_commit_entry($d)->{log},
 996                                         ra => Git::SVN::Ra->new($url),
 997                                         config => SVN::Core::config_get_config(
 998                                                 $Git::SVN::Ra::config_dir
 999                                         ),
1000                                         tree_a => "$d~1",
1001                                         tree_b => $d,
1002                                         editor_cb => sub {
1003                                                print "Committed r$_[0]\n";
1004                                                $cmt_rev = $_[0];
1005                                         },
1006                                         mergeinfo => $_merge_info,
1007                                         svn_path => '');
1008
1009                         my $err_handler = $SVN::Error::handler;
1010                         $SVN::Error::handler = sub {
1011                                 my $err = shift;
1012                                 dcommit_rebase(1, $current_head, $gs->refname,
1013                                         $err);
1014                         };
1015
1016                         if (!Git::SVN::Editor->new(\%ed_opts)->apply_diff) {
1017                                 print "No changes\n$d~1 == $d\n";
1018                         } elsif ($parents->{$d} && @{$parents->{$d}}) {
1019                                 $gs->{inject_parents_dcommit}->{$cmt_rev} =
1020                                                                $parents->{$d};
1021                         }
1022                         $_fetch_all ? $gs->fetch_all : $gs->fetch;
1023                         $SVN::Error::handler = $err_handler;
1024                         $last_rev = $cmt_rev;
1025                         next if $_no_rebase;
1026
1027                         my @diff = dcommit_rebase(@$linear_refs == 0, $d,
1028                                                 $gs->refname, undef);
1029
1030                         $rewritten_parent = command_oneline(qw/rev-parse/,
1031                                                         $gs->refname);
1032
1033                         if (@diff) {
1034                                 $current_head = command_oneline(qw/rev-parse
1035                                                                 HEAD/);
1036                                 @refs = ();
1037                                 my ($url_, $rev_, $uuid_, $gs_) =
1038                                               working_head_info('HEAD', \@refs);
1039                                 my ($linear_refs_, $parents_) =
1040                                               linearize_history($gs_, \@refs);
1041                                 if (scalar(@$linear_refs) !=
1042                                     scalar(@$linear_refs_)) {
1043                                         fatal "# of revisions changed ",
1044                                           "\nbefore:\n",
1045                                           join("\n", @$linear_refs),
1046                                           "\n\nafter:\n",
1047                                           join("\n", @$linear_refs_), "\n",
1048                                           'If you are attempting to commit ',
1049                                           "merges, try running:\n\t",
1050                                           'git rebase --interactive',
1051                                           '--preserve-merges ',
1052                                           $gs->refname,
1053                                           "\nBefore dcommitting";
1054                                 }
1055                                 if ($url_ ne $expect_url) {
1056                                         if ($url_ eq $gs->metadata_url) {
1057                                                 print
1058                                                   "Accepting rewritten URL:",
1059                                                   " $url_\n";
1060                                         } else {
1061                                                 fatal
1062                                                   "URL mismatch after rebase:",
1063                                                   " $url_ != $expect_url";
1064                                         }
1065                                 }
1066                                 if ($uuid_ ne $uuid) {
1067                                         fatal "uuid mismatch after rebase: ",
1068                                               "$uuid_ != $uuid";
1069                                 }
1070                                 # remap parents
1071                                 my (%p, @l, $i);
1072                                 for ($i = 0; $i < scalar @$linear_refs; $i++) {
1073                                         my $new = $linear_refs_->[$i] or next;
1074                                         $p{$new} =
1075                                                 $parents->{$linear_refs->[$i]};
1076                                         push @l, $new;
1077                                 }
1078                                 $parents = \%p;
1079                                 $linear_refs = \@l;
1080                                 undef $last_rev;
1081                         }
1082                 }
1083         }
1084
1085         if ($old_head) {
1086                 my $new_head = command_oneline(qw/rev-parse HEAD/);
1087                 my $new_is_symbolic = eval {
1088                         command_oneline(qw/symbolic-ref -q HEAD/);
1089                 };
1090                 if ($new_is_symbolic) {
1091                         print "dcommitted the branch ", $head, "\n";
1092                 } else {
1093                         print "dcommitted on a detached HEAD because you gave ",
1094                               "a revision argument.\n",
1095                               "The rewritten commit is: ", $new_head, "\n";
1096                 }
1097                 command(['checkout', $old_head], STDERR => 0);
1098         }
1099
1100         unlink $gs->{index};
1101 }
1102
1103 sub cmd_branch {
1104         my ($branch_name, $head) = @_;
1105
1106         unless (defined $branch_name && length $branch_name) {
1107                 die(($_tag ? "tag" : "branch") . " name required\n");
1108         }
1109         $head ||= 'HEAD';
1110
1111         my (undef, $rev, undef, $gs) = working_head_info($head);
1112         my $src = $gs->full_pushurl;
1113
1114         my $remote = Git::SVN::read_all_remotes()->{$gs->{repo_id}};
1115         my $allglobs = $remote->{ $_tag ? 'tags' : 'branches' };
1116         my $glob;
1117         if ($#{$allglobs} == 0) {
1118                 $glob = $allglobs->[0];
1119         } else {
1120                 unless(defined $_branch_dest) {
1121                         die "Multiple ",
1122                             $_tag ? "tag" : "branch",
1123                             " paths defined for Subversion repository.\n",
1124                             "You must specify where you want to create the ",
1125                             $_tag ? "tag" : "branch",
1126                             " with the --destination argument.\n";
1127                 }
1128                 foreach my $g (@{$allglobs}) {
1129                         my $re = Git::SVN::Editor::glob2pat($g->{path}->{left});
1130                         if ($_branch_dest =~ /$re/) {
1131                                 $glob = $g;
1132                                 last;
1133                         }
1134                 }
1135                 unless (defined $glob) {
1136                         my $dest_re = qr/\b\Q$_branch_dest\E\b/;
1137                         foreach my $g (@{$allglobs}) {
1138                                 $g->{path}->{left} =~ /$dest_re/ or next;
1139                                 if (defined $glob) {
1140                                         die "Ambiguous destination: ",
1141                                             $_branch_dest, "\nmatches both '",
1142                                             $glob->{path}->{left}, "' and '",
1143                                             $g->{path}->{left}, "'\n";
1144                                 }
1145                                 $glob = $g;
1146                         }
1147                         unless (defined $glob) {
1148                                 die "Unknown ",
1149                                     $_tag ? "tag" : "branch",
1150                                     " destination $_branch_dest\n";
1151                         }
1152                 }
1153         }
1154         my ($lft, $rgt) = @{ $glob->{path} }{qw/left right/};
1155         my $url;
1156         if (defined $_commit_url) {
1157                 $url = $_commit_url;
1158         } else {
1159                 $url = eval { command_oneline('config', '--get',
1160                         "svn-remote.$gs->{repo_id}.commiturl") };
1161                 if (!$url) {
1162                         $url = $remote->{pushurl} || $remote->{url};
1163                 }
1164         }
1165         my $dst = join '/', $url, $lft, $branch_name, ($rgt || ());
1166
1167         if ($dst =~ /^https:/ && $src =~ /^http:/) {
1168                 $src=~s/^http:/https:/;
1169         }
1170
1171         ::_req_svn();
1172         require SVN::Client;
1173
1174         my $ctx = SVN::Client->new(
1175                 config => SVN::Core::config_get_config(
1176                         $Git::SVN::Ra::config_dir
1177                 ),
1178                 log_msg => sub {
1179                         ${ $_[0] } = defined $_message
1180                                 ? $_message
1181                                 : 'Create ' . ($_tag ? 'tag ' : 'branch ' )
1182                                 . $branch_name;
1183                 },
1184         );
1185
1186         eval {
1187                 $ctx->ls($dst, 'HEAD', 0);
1188         } and die "branch ${branch_name} already exists\n";
1189
1190         if ($_parents) {
1191                 mk_parent_dirs($ctx, $dst);
1192         }
1193
1194         print "Copying ${src} at r${rev} to ${dst}...\n";
1195         $ctx->copy($src, $rev, $dst)
1196                 unless $_dry_run;
1197
1198         $gs->fetch_all;
1199 }
1200
1201 sub mk_parent_dirs {
1202         my ($ctx, $parent) = @_;
1203         $parent =~ s{/[^/]*$}{};
1204
1205         if (!eval{$ctx->ls($parent, 'HEAD', 0)}) {
1206                 mk_parent_dirs($ctx, $parent);
1207                 print "Creating parent folder ${parent} ...\n";
1208                 $ctx->mkdir($parent) unless $_dry_run;
1209         }
1210 }
1211
1212 sub cmd_find_rev {
1213         my $revision_or_hash = shift or die "SVN or git revision required ",
1214                                             "as a command-line argument\n";
1215         my $result;
1216         if ($revision_or_hash =~ /^r\d+$/) {
1217                 my $head = shift;
1218                 $head ||= 'HEAD';
1219                 my @refs;
1220                 my (undef, undef, $uuid, $gs) = working_head_info($head, \@refs);
1221                 unless ($gs) {
1222                         die "Unable to determine upstream SVN information from ",
1223                             "$head history\n";
1224                 }
1225                 my $desired_revision = substr($revision_or_hash, 1);
1226                 if ($_before) {
1227                         $result = $gs->find_rev_before($desired_revision, 1);
1228                 } elsif ($_after) {
1229                         $result = $gs->find_rev_after($desired_revision, 1);
1230                 } else {
1231                         $result = $gs->rev_map_get($desired_revision, $uuid);
1232                 }
1233         } else {
1234                 my (undef, $rev, undef) = cmt_metadata($revision_or_hash);
1235                 $result = $rev;
1236         }
1237         print "$result\n" if $result;
1238 }
1239
1240 sub auto_create_empty_directories {
1241         my ($gs) = @_;
1242         my $var = eval { command_oneline('config', '--get', '--bool',
1243                                          "svn-remote.$gs->{repo_id}.automkdirs") };
1244         # By default, create empty directories by consulting the unhandled log,
1245         # but allow setting it to 'false' to skip it.
1246         return !($var && $var eq 'false');
1247 }
1248
1249 sub cmd_rebase {
1250         command_noisy(qw/update-index --refresh/);
1251         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1252         unless ($gs) {
1253                 die "Unable to determine upstream SVN information from ",
1254                     "working tree history\n";
1255         }
1256         if ($_dry_run) {
1257                 print "Remote Branch: " . $gs->refname . "\n";
1258                 print "SVN URL: " . $url . "\n";
1259                 return;
1260         }
1261         if (command(qw/diff-index HEAD --/)) {
1262                 print STDERR "Cannot rebase with uncommitted changes:\n";
1263                 command_noisy('status');
1264                 exit 1;
1265         }
1266         unless ($_local) {
1267                 # rebase will checkout for us, so no need to do it explicitly
1268                 $_no_checkout = 'true';
1269                 $_fetch_all ? $gs->fetch_all : $gs->fetch;
1270         }
1271         command_noisy(rebase_cmd(), $gs->refname);
1272         if (auto_create_empty_directories($gs)) {
1273                 $gs->mkemptydirs;
1274         }
1275 }
1276
1277 sub cmd_show_ignore {
1278         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1279         $gs ||= Git::SVN->new;
1280         my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
1281         $gs->prop_walk($gs->path, $r, sub {
1282                 my ($gs, $path, $props) = @_;
1283                 print STDOUT "\n# $path\n";
1284                 my $s = $props->{'svn:ignore'} or return;
1285                 $s =~ s/[\r\n]+/\n/g;
1286                 $s =~ s/^\n+//;
1287                 chomp $s;
1288                 $s =~ s#^#$path#gm;
1289                 print STDOUT "$s\n";
1290         });
1291 }
1292
1293 sub cmd_show_externals {
1294         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1295         $gs ||= Git::SVN->new;
1296         my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
1297         $gs->prop_walk($gs->path, $r, sub {
1298                 my ($gs, $path, $props) = @_;
1299                 print STDOUT "\n# $path\n";
1300                 my $s = $props->{'svn:externals'} or return;
1301                 $s =~ s/[\r\n]+/\n/g;
1302                 chomp $s;
1303                 $s =~ s#^#$path#gm;
1304                 print STDOUT "$s\n";
1305         });
1306 }
1307
1308 sub cmd_create_ignore {
1309         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1310         $gs ||= Git::SVN->new;
1311         my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
1312         $gs->prop_walk($gs->path, $r, sub {
1313                 my ($gs, $path, $props) = @_;
1314                 # $path is of the form /path/to/dir/
1315                 $path = '.' . $path;
1316                 # SVN can have attributes on empty directories,
1317                 # which git won't track
1318                 mkpath([$path]) unless -d $path;
1319                 my $ignore = $path . '.gitignore';
1320                 my $s = $props->{'svn:ignore'} or return;
1321                 open(GITIGNORE, '>', $ignore)
1322                   or fatal("Failed to open `$ignore' for writing: $!");
1323                 $s =~ s/[\r\n]+/\n/g;
1324                 $s =~ s/^\n+//;
1325                 chomp $s;
1326                 # Prefix all patterns so that the ignore doesn't apply
1327                 # to sub-directories.
1328                 $s =~ s#^#/#gm;
1329                 print GITIGNORE "$s\n";
1330                 close(GITIGNORE)
1331                   or fatal("Failed to close `$ignore': $!");
1332                 command_noisy('add', '-f', $ignore);
1333         });
1334 }
1335
1336 sub cmd_mkdirs {
1337         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1338         $gs ||= Git::SVN->new;
1339         $gs->mkemptydirs($_revision);
1340 }
1341
1342 # get_svnprops(PATH)
1343 # ------------------
1344 # Helper for cmd_propget and cmd_proplist below.
1345 sub get_svnprops {
1346         my $path = shift;
1347         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1348         $gs ||= Git::SVN->new;
1349
1350         # prefix THE PATH by the sub-directory from which the user
1351         # invoked us.
1352         $path = $cmd_dir_prefix . $path;
1353         fatal("No such file or directory: $path") unless -e $path;
1354         my $is_dir = -d $path ? 1 : 0;
1355         $path = join_paths($gs->path, $path);
1356
1357         # canonicalize the path (otherwise libsvn will abort or fail to
1358         # find the file)
1359         $path = canonicalize_path($path);
1360
1361         my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
1362         my $props;
1363         if ($is_dir) {
1364                 (undef, undef, $props) = $gs->ra->get_dir($path, $r);
1365         }
1366         else {
1367                 (undef, $props) = $gs->ra->get_file($path, $r, undef);
1368         }
1369         return $props;
1370 }
1371
1372 # cmd_propget (PROP, PATH)
1373 # ------------------------
1374 # Print the SVN property PROP for PATH.
1375 sub cmd_propget {
1376         my ($prop, $path) = @_;
1377         $path = '.' if not defined $path;
1378         usage(1) if not defined $prop;
1379         my $props = get_svnprops($path);
1380         if (not defined $props->{$prop}) {
1381                 fatal("`$path' does not have a `$prop' SVN property.");
1382         }
1383         print $props->{$prop} . "\n";
1384 }
1385
1386 # cmd_propset (PROPNAME, PROPVAL, PATH)
1387 # ------------------------
1388 # Adjust the SVN property PROPNAME to PROPVAL for PATH.
1389 sub cmd_propset {
1390         my ($propname, $propval, $path) = @_;
1391         $path = '.' if not defined $path;
1392         $path = $cmd_dir_prefix . $path;
1393         usage(1) if not defined $propname;
1394         usage(1) if not defined $propval;
1395         my $file = basename($path);
1396         my $dn = dirname($path);
1397         my $cur_props = Git::SVN::Editor::check_attr( "svn-properties", $path );
1398         my @new_props;
1399         if (!$cur_props || $cur_props eq "unset" || $cur_props eq "" || $cur_props eq "set") {
1400                 push @new_props, "$propname=$propval";
1401         } else {
1402                 # TODO: handle combining properties better
1403                 my @props = split(/;/, $cur_props);
1404                 my $replaced_prop;
1405                 foreach my $prop (@props) {
1406                         # Parse 'name=value' syntax and set the property.
1407                         if ($prop =~ /([^=]+)=(.*)/) {
1408                                 my ($n,$v) = ($1,$2);
1409                                 if ($n eq $propname) {
1410                                         $v = $propval;
1411                                         $replaced_prop = 1;
1412                                 }
1413                                 push @new_props, "$n=$v";
1414                         }
1415                 }
1416                 if (!$replaced_prop) {
1417                         push @new_props, "$propname=$propval";
1418                 }
1419         }
1420         my $attrfile = "$dn/.gitattributes";
1421         open my $attrfh, '>>', $attrfile or die "Can't open $attrfile: $!\n";
1422         # TODO: don't simply append here if $file already has svn-properties
1423         my $new_props = join(';', @new_props);
1424         print $attrfh "$file svn-properties=$new_props\n" or
1425                 die "write to $attrfile: $!\n";
1426         close $attrfh or die "close $attrfile: $!\n";
1427 }
1428
1429 # cmd_proplist (PATH)
1430 # -------------------
1431 # Print the list of SVN properties for PATH.
1432 sub cmd_proplist {
1433         my $path = shift;
1434         $path = '.' if not defined $path;
1435         my $props = get_svnprops($path);
1436         print "Properties on '$path':\n";
1437         foreach (sort keys %{$props}) {
1438                 print "  $_\n";
1439         }
1440 }
1441
1442 sub cmd_multi_init {
1443         my $url = shift;
1444         unless (defined $_trunk || @_branches || @_tags) {
1445                 usage(1);
1446         }
1447
1448         $_prefix = 'origin/' unless defined $_prefix;
1449         if (defined $url) {
1450                 $url = canonicalize_url($url);
1451                 init_subdir(@_);
1452         }
1453         do_git_init_db();
1454         if (defined $_trunk) {
1455                 $_trunk =~ s#^/+##;
1456                 my $trunk_ref = 'refs/remotes/' . $_prefix . 'trunk';
1457                 # try both old-style and new-style lookups:
1458                 my $gs_trunk = eval { Git::SVN->new($trunk_ref) };
1459                 unless ($gs_trunk) {
1460                         my ($trunk_url, $trunk_path) =
1461                                               complete_svn_url($url, $_trunk);
1462                         $gs_trunk = Git::SVN->init($trunk_url, $trunk_path,
1463                                                    undef, $trunk_ref);
1464                 }
1465         }
1466         return unless @_branches || @_tags;
1467         my $ra = $url ? Git::SVN::Ra->new($url) : undef;
1468         foreach my $path (@_branches) {
1469                 complete_url_ls_init($ra, $path, '--branches/-b', $_prefix);
1470         }
1471         foreach my $path (@_tags) {
1472                 complete_url_ls_init($ra, $path, '--tags/-t', $_prefix.'tags/');
1473         }
1474 }
1475
1476 sub cmd_multi_fetch {
1477         $Git::SVN::no_reuse_existing = undef;
1478         my $remotes = Git::SVN::read_all_remotes();
1479         foreach my $repo_id (sort keys %$remotes) {
1480                 if ($remotes->{$repo_id}->{url}) {
1481                         Git::SVN::fetch_all($repo_id, $remotes);
1482                 }
1483         }
1484 }
1485
1486 # this command is special because it requires no metadata
1487 sub cmd_commit_diff {
1488         my ($ta, $tb, $url) = @_;
1489         my $usage = "usage: $0 commit-diff -r<revision> ".
1490                     "<tree-ish> <tree-ish> [<URL>]";
1491         fatal($usage) if (!defined $ta || !defined $tb);
1492         my $svn_path = '';
1493         if (!defined $url) {
1494                 my $gs = eval { Git::SVN->new };
1495                 if (!$gs) {
1496                         fatal("Needed URL or usable git-svn --id in ",
1497                               "the command-line\n", $usage);
1498                 }
1499                 $url = $gs->url;
1500                 $svn_path = $gs->path;
1501         }
1502         unless (defined $_revision) {
1503                 fatal("-r|--revision is a required argument\n", $usage);
1504         }
1505         if (defined $_message && defined $_file) {
1506                 fatal("Both --message/-m and --file/-F specified ",
1507                       "for the commit message.\n",
1508                       "I have no idea what you mean");
1509         }
1510         if (defined $_file) {
1511                 $_message = file_to_s($_file);
1512         } else {
1513                 $_message ||= get_commit_entry($tb)->{log};
1514         }
1515         my $ra ||= Git::SVN::Ra->new($url);
1516         my $r = $_revision;
1517         if ($r eq 'HEAD') {
1518                 $r = $ra->get_latest_revnum;
1519         } elsif ($r !~ /^\d+$/) {
1520                 die "revision argument: $r not understood by git-svn\n";
1521         }
1522         my %ed_opts = ( r => $r,
1523                         log => $_message,
1524                         ra => $ra,
1525                         tree_a => $ta,
1526                         tree_b => $tb,
1527                         editor_cb => sub { print "Committed r$_[0]\n" },
1528                         svn_path => $svn_path );
1529         if (!Git::SVN::Editor->new(\%ed_opts)->apply_diff) {
1530                 print "No changes\n$ta == $tb\n";
1531         }
1532 }
1533
1534 sub cmd_info {
1535         my $path_arg = defined($_[0]) ? $_[0] : '.';
1536         my $path = $path_arg;
1537         if (File::Spec->file_name_is_absolute($path)) {
1538                 $path = canonicalize_path($path);
1539
1540                 my $toplevel = eval {
1541                         my @cmd = qw/rev-parse --show-toplevel/;
1542                         command_oneline(\@cmd, STDERR => 0);
1543                 };
1544
1545                 # remove $toplevel from the absolute path:
1546                 my ($vol, $dirs, $file) = File::Spec->splitpath($path);
1547                 my (undef, $tdirs, $tfile) = File::Spec->splitpath($toplevel);
1548                 my @dirs = File::Spec->splitdir($dirs);
1549                 my @tdirs = File::Spec->splitdir($tdirs);
1550                 pop @dirs if $dirs[-1] eq '';
1551                 pop @tdirs if $tdirs[-1] eq '';
1552                 push @dirs, $file;
1553                 push @tdirs, $tfile;
1554                 while (@tdirs && @dirs && $tdirs[0] eq $dirs[0]) {
1555                         shift @dirs;
1556                         shift @tdirs;
1557                 }
1558                 $dirs = File::Spec->catdir(@dirs);
1559                 $path = File::Spec->catpath($vol, $dirs);
1560
1561                 $path = canonicalize_path($path);
1562         } else {
1563                 $path = canonicalize_path($cmd_dir_prefix . $path);
1564         }
1565         if (exists $_[1]) {
1566                 die "Too many arguments specified\n";
1567         }
1568
1569         my ($file_type, $diff_status) = find_file_type_and_diff_status($path);
1570
1571         if (!$file_type && !$diff_status) {
1572                 print STDERR "svn: '$path' is not under version control\n";
1573                 exit 1;
1574         }
1575
1576         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1577         unless ($gs) {
1578                 die "Unable to determine upstream SVN information from ",
1579                     "working tree history\n";
1580         }
1581
1582         # canonicalize_path() will return "" to make libsvn 1.5.x happy,
1583         $path = "." if $path eq "";
1584
1585         my $full_url = canonicalize_url( add_path_to_url( $url, $path ) );
1586
1587         if ($_url) {
1588                 print "$full_url\n";
1589                 return;
1590         }
1591
1592         my $result = "Path: $path_arg\n";
1593         $result .= "Name: " . basename($path) . "\n" if $file_type ne "dir";
1594         $result .= "URL: $full_url\n";
1595
1596         eval {
1597                 my $repos_root = $gs->repos_root;
1598                 Git::SVN::remove_username($repos_root);
1599                 $result .= "Repository Root: " . canonicalize_url($repos_root) . "\n";
1600         };
1601         if ($@) {
1602                 $result .= "Repository Root: (offline)\n";
1603         }
1604         ::_req_svn();
1605         $result .= "Repository UUID: $uuid\n" unless $diff_status eq "A" &&
1606                 (::compare_svn_version('1.5.4') <= 0 || $file_type ne "dir");
1607         $result .= "Revision: " . ($diff_status eq "A" ? 0 : $rev) . "\n";
1608
1609         $result .= "Node Kind: " .
1610                    ($file_type eq "dir" ? "directory" : "file") . "\n";
1611
1612         my $schedule = $diff_status eq "A"
1613                        ? "add"
1614                        : ($diff_status eq "D" ? "delete" : "normal");
1615         $result .= "Schedule: $schedule\n";
1616
1617         if ($diff_status eq "A") {
1618                 print $result, "\n";
1619                 return;
1620         }
1621
1622         my ($lc_author, $lc_rev, $lc_date_utc);
1623         my @args = Git::SVN::Log::git_svn_log_cmd($rev, $rev, "--", $path);
1624         my $log = command_output_pipe(@args);
1625         my $esc_color = qr/(?:\033\[(?:(?:\d+;)*\d*)?m)*/;
1626         while (<$log>) {
1627                 if (/^${esc_color}author (.+) <[^>]+> (\d+) ([\-\+]?\d+)$/o) {
1628                         $lc_author = $1;
1629                         $lc_date_utc = Git::SVN::Log::parse_git_date($2, $3);
1630                 } elsif (/^${esc_color}    (git-svn-id:.+)$/o) {
1631                         (undef, $lc_rev, undef) = ::extract_metadata($1);
1632                 }
1633         }
1634         close $log;
1635
1636         Git::SVN::Log::set_local_timezone();
1637
1638         $result .= "Last Changed Author: $lc_author\n";
1639         $result .= "Last Changed Rev: $lc_rev\n";
1640         $result .= "Last Changed Date: " .
1641                    Git::SVN::Log::format_svn_date($lc_date_utc) . "\n";
1642
1643         if ($file_type ne "dir") {
1644                 my $text_last_updated_date =
1645                     ($diff_status eq "D" ? $lc_date_utc : (stat $path)[9]);
1646                 $result .=
1647                     "Text Last Updated: " .
1648                     Git::SVN::Log::format_svn_date($text_last_updated_date) .
1649                     "\n";
1650                 my $checksum;
1651                 if ($diff_status eq "D") {
1652                         my ($fh, $ctx) =
1653                             command_output_pipe(qw(cat-file blob), "HEAD:$path");
1654                         if ($file_type eq "link") {
1655                                 my $file_name = <$fh>;
1656                                 $checksum = md5sum("link $file_name");
1657                         } else {
1658                                 $checksum = md5sum($fh);
1659                         }
1660                         command_close_pipe($fh, $ctx);
1661                 } elsif ($file_type eq "link") {
1662                         my $file_name =
1663                             command(qw(cat-file blob), "HEAD:$path");
1664                         $checksum =
1665                             md5sum("link " . $file_name);
1666                 } else {
1667                         open FILE, "<", $path or die $!;
1668                         $checksum = md5sum(\*FILE);
1669                         close FILE or die $!;
1670                 }
1671                 $result .= "Checksum: " . $checksum . "\n";
1672         }
1673
1674         print $result, "\n";
1675 }
1676
1677 sub cmd_reset {
1678         my $target = shift || $_revision or die "SVN revision required\n";
1679         $target = $1 if $target =~ /^r(\d+)$/;
1680         $target =~ /^\d+$/ or die "Numeric SVN revision expected\n";
1681         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1682         unless ($gs) {
1683                 die "Unable to determine upstream SVN information from ".
1684                     "history\n";
1685         }
1686         my ($r, $c) = $gs->find_rev_before($target, not $_fetch_parent);
1687         die "Cannot find SVN revision $target\n" unless defined($c);
1688         $gs->rev_map_set($r, $c, 'reset', $uuid);
1689         print "r$r = $c ($gs->{ref_id})\n";
1690 }
1691
1692 sub cmd_gc {
1693         require File::Find;
1694         if (!can_compress()) {
1695                 warn "Compress::Zlib could not be found; unhandled.log " .
1696                      "files will not be compressed.\n";
1697         }
1698         File::Find::find({ wanted => \&gc_directory, no_chdir => 1},
1699                          "$ENV{GIT_DIR}/svn");
1700 }
1701
1702 ########################### utility functions #########################
1703
1704 sub rebase_cmd {
1705         my @cmd = qw/rebase/;
1706         push @cmd, '-v' if $_verbose;
1707         push @cmd, qw/--merge/ if $_merge;
1708         push @cmd, "--strategy=$_strategy" if $_strategy;
1709         push @cmd, "--preserve-merges" if $_preserve_merges;
1710         @cmd;
1711 }
1712
1713 sub post_fetch_checkout {
1714         return if $_no_checkout;
1715         return if verify_ref('HEAD^0');
1716         my $gs = $Git::SVN::_head or return;
1717
1718         # look for "trunk" ref if it exists
1719         my $remote = Git::SVN::read_all_remotes()->{$gs->{repo_id}};
1720         my $fetch = $remote->{fetch};
1721         if ($fetch) {
1722                 foreach my $p (keys %$fetch) {
1723                         basename($fetch->{$p}) eq 'trunk' or next;
1724                         $gs = Git::SVN->new($fetch->{$p}, $gs->{repo_id}, $p);
1725                         last;
1726                 }
1727         }
1728
1729         command_noisy(qw(update-ref HEAD), $gs->refname);
1730         return unless verify_ref('HEAD^0');
1731
1732         return if $ENV{GIT_DIR} !~ m#^(?:.*/)?\.git$#;
1733         my $index = $ENV{GIT_INDEX_FILE} || "$ENV{GIT_DIR}/index";
1734         return if -f $index;
1735
1736         return if command_oneline(qw/rev-parse --is-inside-work-tree/) eq 'false';
1737         return if command_oneline(qw/rev-parse --is-inside-git-dir/) eq 'true';
1738         command_noisy(qw/read-tree -m -u -v HEAD HEAD/);
1739         print STDERR "Checked out HEAD:\n  ",
1740                      $gs->full_url, " r", $gs->last_rev, "\n";
1741         if (auto_create_empty_directories($gs)) {
1742                 $gs->mkemptydirs($gs->last_rev);
1743         }
1744 }
1745
1746 sub complete_svn_url {
1747         my ($url, $path) = @_;
1748
1749         if ($path =~ m#^[a-z\+]+://#i) { # path is a URL
1750                 $path = canonicalize_url($path);
1751         } else {
1752                 $path = canonicalize_path($path);
1753                 if (!defined $url || $url !~ m#^[a-z\+]+://#i) {
1754                         fatal("E: '$path' is not a complete URL ",
1755                               "and a separate URL is not specified");
1756                 }
1757                 return ($url, $path);
1758         }
1759         return ($path, '');
1760 }
1761
1762 sub complete_url_ls_init {
1763         my ($ra, $repo_path, $switch, $pfx) = @_;
1764         unless ($repo_path) {
1765                 print STDERR "W: $switch not specified\n";
1766                 return;
1767         }
1768         if ($repo_path =~ m#^[a-z\+]+://#i) {
1769                 $repo_path = canonicalize_url($repo_path);
1770                 $ra = Git::SVN::Ra->new($repo_path);
1771                 $repo_path = '';
1772         } else {
1773                 $repo_path = canonicalize_path($repo_path);
1774                 $repo_path =~ s#^/+##;
1775                 unless ($ra) {
1776                         fatal("E: '$repo_path' is not a complete URL ",
1777                               "and a separate URL is not specified");
1778                 }
1779         }
1780         my $url = $ra->url;
1781         my $gs = Git::SVN->init($url, undef, undef, undef, 1);
1782         my $k = "svn-remote.$gs->{repo_id}.url";
1783         my $orig_url = eval { command_oneline(qw/config --get/, $k) };
1784         if ($orig_url && ($orig_url ne $gs->url)) {
1785                 die "$k already set: $orig_url\n",
1786                     "wanted to set to: $gs->url\n";
1787         }
1788         command_oneline('config', $k, $gs->url) unless $orig_url;
1789
1790         my $remote_path = join_paths( $gs->path, $repo_path );
1791         $remote_path =~ s{%([0-9A-F]{2})}{chr hex($1)}ieg;
1792         $remote_path =~ s#^/##g;
1793         $remote_path .= "/*" if $remote_path !~ /\*/;
1794         my ($n) = ($switch =~ /^--(\w+)/);
1795         if (length $pfx && $pfx !~ m#/$#) {
1796                 die "--prefix='$pfx' must have a trailing slash '/'\n";
1797         }
1798         command_noisy('config',
1799                       '--add',
1800                       "svn-remote.$gs->{repo_id}.$n",
1801                       "$remote_path:refs/remotes/$pfx*" .
1802                         ('/*' x (($remote_path =~ tr/*/*/) - 1)) );
1803 }
1804
1805 sub verify_ref {
1806         my ($ref) = @_;
1807         eval { command_oneline([ 'rev-parse', '--verify', $ref ],
1808                                { STDERR => 0 }); };
1809 }
1810
1811 sub get_tree_from_treeish {
1812         my ($treeish) = @_;
1813         # $treeish can be a symbolic ref, too:
1814         my $type = command_oneline(qw/cat-file -t/, $treeish);
1815         my $expected;
1816         while ($type eq 'tag') {
1817                 ($treeish, $type) = command(qw/cat-file tag/, $treeish);
1818         }
1819         if ($type eq 'commit') {
1820                 $expected = (grep /^tree /, command(qw/cat-file commit/,
1821                                                     $treeish))[0];
1822                 ($expected) = ($expected =~ /^tree ($sha1)$/o);
1823                 die "Unable to get tree from $treeish\n" unless $expected;
1824         } elsif ($type eq 'tree') {
1825                 $expected = $treeish;
1826         } else {
1827                 die "$treeish is a $type, expected tree, tag or commit\n";
1828         }
1829         return $expected;
1830 }
1831
1832 sub get_commit_entry {
1833         my ($treeish) = shift;
1834         my %log_entry = ( log => '', tree => get_tree_from_treeish($treeish) );
1835         my $commit_editmsg = "$ENV{GIT_DIR}/COMMIT_EDITMSG";
1836         my $commit_msg = "$ENV{GIT_DIR}/COMMIT_MSG";
1837         open my $log_fh, '>', $commit_editmsg or croak $!;
1838
1839         my $type = command_oneline(qw/cat-file -t/, $treeish);
1840         if ($type eq 'commit' || $type eq 'tag') {
1841                 my ($msg_fh, $ctx) = command_output_pipe('cat-file',
1842                                                          $type, $treeish);
1843                 my $in_msg = 0;
1844                 my $author;
1845                 my $saw_from = 0;
1846                 my $msgbuf = "";
1847                 while (<$msg_fh>) {
1848                         if (!$in_msg) {
1849                                 $in_msg = 1 if (/^$/);
1850                                 $author = $1 if (/^author (.*>)/);
1851                         } elsif (/^git-svn-id: /) {
1852                                 # skip this for now, we regenerate the
1853                                 # correct one on re-fetch anyways
1854                                 # TODO: set *:merge properties or like...
1855                         } else {
1856                                 if (/^From:/ || /^Signed-off-by:/) {
1857                                         $saw_from = 1;
1858                                 }
1859                                 $msgbuf .= $_;
1860                         }
1861                 }
1862                 $msgbuf =~ s/\s+$//s;
1863                 if ($Git::SVN::_add_author_from && defined($author)
1864                     && !$saw_from) {
1865                         $msgbuf .= "\n\nFrom: $author";
1866                 }
1867                 print $log_fh $msgbuf or croak $!;
1868                 command_close_pipe($msg_fh, $ctx);
1869         }
1870         close $log_fh or croak $!;
1871
1872         if ($_edit || ($type eq 'tree')) {
1873                 chomp(my $editor = command_oneline(qw(var GIT_EDITOR)));
1874                 system('sh', '-c', $editor.' "$@"', $editor, $commit_editmsg);
1875         }
1876         rename $commit_editmsg, $commit_msg or croak $!;
1877         {
1878                 require Encode;
1879                 # SVN requires messages to be UTF-8 when entering the repo
1880                 local $/;
1881                 open $log_fh, '<', $commit_msg or croak $!;
1882                 binmode $log_fh;
1883                 chomp($log_entry{log} = <$log_fh>);
1884
1885                 my $enc = Git::config('i18n.commitencoding') || 'UTF-8';
1886                 my $msg = $log_entry{log};
1887
1888                 eval { $msg = Encode::decode($enc, $msg, 1) };
1889                 if ($@) {
1890                         die "Could not decode as $enc:\n", $msg,
1891                             "\nPerhaps you need to set i18n.commitencoding\n";
1892                 }
1893
1894                 eval { $msg = Encode::encode('UTF-8', $msg, 1) };
1895                 die "Could not encode as UTF-8:\n$msg\n" if $@;
1896
1897                 $log_entry{log} = $msg;
1898
1899                 close $log_fh or croak $!;
1900         }
1901         unlink $commit_msg;
1902         \%log_entry;
1903 }
1904
1905 sub s_to_file {
1906         my ($str, $file, $mode) = @_;
1907         open my $fd,'>',$file or croak $!;
1908         print $fd $str,"\n" or croak $!;
1909         close $fd or croak $!;
1910         chmod ($mode &~ umask, $file) if (defined $mode);
1911 }
1912
1913 sub file_to_s {
1914         my $file = shift;
1915         open my $fd,'<',$file or croak "$!: file: $file\n";
1916         local $/;
1917         my $ret = <$fd>;
1918         close $fd or croak $!;
1919         $ret =~ s/\s*$//s;
1920         return $ret;
1921 }
1922
1923 # '<svn username> = real-name <email address>' mapping based on git-svnimport:
1924 sub load_authors {
1925         open my $authors, '<', $_authors or die "Can't open $_authors $!\n";
1926         my $log = $cmd eq 'log';
1927         while (<$authors>) {
1928                 chomp;
1929                 next unless /^(.+?|\(no author\))\s*=\s*(.+?)\s*<(.*)>\s*$/;
1930                 my ($user, $name, $email) = ($1, $2, $3);
1931                 if ($log) {
1932                         $Git::SVN::Log::rusers{"$name <$email>"} = $user;
1933                 } else {
1934                         $users{$user} = [$name, $email];
1935                 }
1936         }
1937         close $authors or croak $!;
1938 }
1939
1940 # convert GetOpt::Long specs for use by git-config
1941 sub read_git_config {
1942         my $opts = shift;
1943         my @config_only;
1944         foreach my $o (keys %$opts) {
1945                 # if we have mixedCase and a long option-only, then
1946                 # it's a config-only variable that we don't need for
1947                 # the command-line.
1948                 push @config_only, $o if ($o =~ /[A-Z]/ && $o =~ /^[a-z]+$/i);
1949                 my $v = $opts->{$o};
1950                 my ($key) = ($o =~ /^([a-zA-Z\-]+)/);
1951                 $key =~ s/-//g;
1952                 my $arg = 'git config';
1953                 $arg .= ' --int' if ($o =~ /[:=]i$/);
1954                 $arg .= ' --bool' if ($o !~ /[:=][sfi]$/);
1955                 if (ref $v eq 'ARRAY') {
1956                         chomp(my @tmp = `$arg --get-all svn.$key`);
1957                         @$v = @tmp if @tmp;
1958                 } else {
1959                         chomp(my $tmp = `$arg --get svn.$key`);
1960                         if ($tmp && !($arg =~ / --bool/ && $tmp eq 'false')) {
1961                                 $$v = $tmp;
1962                         }
1963                 }
1964         }
1965         delete @$opts{@config_only} if @config_only;
1966 }
1967
1968 sub extract_metadata {
1969         my $id = shift or return (undef, undef, undef);
1970         my ($url, $rev, $uuid) = ($id =~ /^\s*git-svn-id:\s+(.*)\@(\d+)
1971                                                         \s([a-f\d\-]+)$/ix);
1972         if (!defined $rev || !$uuid || !$url) {
1973                 # some of the original repositories I made had
1974                 # identifiers like this:
1975                 ($rev, $uuid) = ($id =~/^\s*git-svn-id:\s(\d+)\@([a-f\d\-]+)/i);
1976         }
1977         return ($url, $rev, $uuid);
1978 }
1979
1980 sub cmt_metadata {
1981         return extract_metadata((grep(/^git-svn-id: /,
1982                 command(qw/cat-file commit/, shift)))[-1]);
1983 }
1984
1985 sub cmt_sha2rev_batch {
1986         my %s2r;
1987         my ($pid, $in, $out, $ctx) = command_bidi_pipe(qw/cat-file --batch/);
1988         my $list = shift;
1989
1990         foreach my $sha (@{$list}) {
1991                 my $first = 1;
1992                 my $size = 0;
1993                 print $out $sha, "\n";
1994
1995                 while (my $line = <$in>) {
1996                         if ($first && $line =~ /^[[:xdigit:]]{40}\smissing$/) {
1997                                 last;
1998                         } elsif ($first &&
1999                                $line =~ /^[[:xdigit:]]{40}\scommit\s(\d+)$/) {
2000                                 $first = 0;
2001                                 $size = $1;
2002                                 next;
2003                         } elsif ($line =~ /^(git-svn-id: )/) {
2004                                 my (undef, $rev, undef) =
2005                                                       extract_metadata($line);
2006                                 $s2r{$sha} = $rev;
2007                         }
2008
2009                         $size -= length($line);
2010                         last if ($size == 0);
2011                 }
2012         }
2013
2014         command_close_bidi_pipe($pid, $in, $out, $ctx);
2015
2016         return \%s2r;
2017 }
2018
2019 sub working_head_info {
2020         my ($head, $refs) = @_;
2021         my @args = qw/rev-list --first-parent --pretty=medium/;
2022         my ($fh, $ctx) = command_output_pipe(@args, $head, "--");
2023         my $hash;
2024         my %max;
2025         while (<$fh>) {
2026                 if ( m{^commit ($::sha1)$} ) {
2027                         unshift @$refs, $hash if $hash and $refs;
2028                         $hash = $1;
2029                         next;
2030                 }
2031                 next unless s{^\s*(git-svn-id:)}{$1};
2032                 my ($url, $rev, $uuid) = extract_metadata($_);
2033                 if (defined $url && defined $rev) {
2034                         next if $max{$url} and $max{$url} < $rev;
2035                         if (my $gs = Git::SVN->find_by_url($url)) {
2036                                 my $c = $gs->rev_map_get($rev, $uuid);
2037                                 if ($c && $c eq $hash) {
2038                                         close $fh; # break the pipe
2039                                         return ($url, $rev, $uuid, $gs);
2040                                 } else {
2041                                         $max{$url} ||= $gs->rev_map_max;
2042                                 }
2043                         }
2044                 }
2045         }
2046         command_close_pipe($fh, $ctx);
2047         (undef, undef, undef, undef);
2048 }
2049
2050 sub read_commit_parents {
2051         my ($parents, $c) = @_;
2052         chomp(my $p = command_oneline(qw/rev-list --parents -1/, $c));
2053         $p =~ s/^($c)\s*// or die "rev-list --parents -1 $c failed!\n";
2054         @{$parents->{$c}} = split(/ /, $p);
2055 }
2056
2057 sub linearize_history {
2058         my ($gs, $refs) = @_;
2059         my %parents;
2060         foreach my $c (@$refs) {
2061                 read_commit_parents(\%parents, $c);
2062         }
2063
2064         my @linear_refs;
2065         my %skip = ();
2066         my $last_svn_commit = $gs->last_commit;
2067         foreach my $c (reverse @$refs) {
2068                 next if $c eq $last_svn_commit;
2069                 last if $skip{$c};
2070
2071                 unshift @linear_refs, $c;
2072                 $skip{$c} = 1;
2073
2074                 # we only want the first parent to diff against for linear
2075                 # history, we save the rest to inject when we finalize the
2076                 # svn commit
2077                 my $fp_a = verify_ref("$c~1");
2078                 my $fp_b = shift @{$parents{$c}} if $parents{$c};
2079                 if (!$fp_a || !$fp_b) {
2080                         die "Commit $c\n",
2081                             "has no parent commit, and therefore ",
2082                             "nothing to diff against.\n",
2083                             "You should be working from a repository ",
2084                             "originally created by git-svn\n";
2085                 }
2086                 if ($fp_a ne $fp_b) {
2087                         die "$c~1 = $fp_a, however parsing commit $c ",
2088                             "revealed that:\n$c~1 = $fp_b\nBUG!\n";
2089                 }
2090
2091                 foreach my $p (@{$parents{$c}}) {
2092                         $skip{$p} = 1;
2093                 }
2094         }
2095         (\@linear_refs, \%parents);
2096 }
2097
2098 sub find_file_type_and_diff_status {
2099         my ($path) = @_;
2100         return ('dir', '') if $path eq '';
2101
2102         my $diff_output =
2103             command_oneline(qw(diff --cached --name-status --), $path) || "";
2104         my $diff_status = (split(' ', $diff_output))[0] || "";
2105
2106         my $ls_tree = command_oneline(qw(ls-tree HEAD), $path) || "";
2107
2108         return (undef, undef) if !$diff_status && !$ls_tree;
2109
2110         if ($diff_status eq "A") {
2111                 return ("link", $diff_status) if -l $path;
2112                 return ("dir", $diff_status) if -d $path;
2113                 return ("file", $diff_status);
2114         }
2115
2116         my $mode = (split(' ', $ls_tree))[0] || "";
2117
2118         return ("link", $diff_status) if $mode eq "120000";
2119         return ("dir", $diff_status) if $mode eq "040000";
2120         return ("file", $diff_status);
2121 }
2122
2123 sub md5sum {
2124         my $arg = shift;
2125         my $ref = ref $arg;
2126         require Digest::MD5;
2127         my $md5 = Digest::MD5->new();
2128         if ($ref eq 'GLOB' || $ref eq 'IO::File' || $ref eq 'File::Temp') {
2129                 $md5->addfile($arg) or croak $!;
2130         } elsif ($ref eq 'SCALAR') {
2131                 $md5->add($$arg) or croak $!;
2132         } elsif (!$ref) {
2133                 $md5->add($arg) or croak $!;
2134         } else {
2135                 fatal "Can't provide MD5 hash for unknown ref type: '", $ref, "'";
2136         }
2137         return $md5->hexdigest();
2138 }
2139
2140 sub gc_directory {
2141         if (can_compress() && -f $_ && basename($_) eq "unhandled.log") {
2142                 my $out_filename = $_ . ".gz";
2143                 open my $in_fh, "<", $_ or die "Unable to open $_: $!\n";
2144                 binmode $in_fh;
2145                 my $gz = Compress::Zlib::gzopen($out_filename, "ab") or
2146                                 die "Unable to open $out_filename: $!\n";
2147
2148                 my $res;
2149                 while ($res = sysread($in_fh, my $str, 1024)) {
2150                         $gz->gzwrite($str) or
2151                                 die "Unable to write: ".$gz->gzerror()."!\n";
2152                 }
2153                 no warnings 'once'; # $File::Find::name would warn
2154                 unlink $_ or die "unlink $File::Find::name: $!\n";
2155         } elsif (-f $_ && basename($_) eq "index") {
2156                 unlink $_ or die "unlink $_: $!\n";
2157         }
2158 }
2159
2160 __END__
2161
2162 Data structures:
2163
2164
2165 $remotes = { # returned by read_all_remotes()
2166         'svn' => {
2167                 # svn-remote.svn.url=https://svn.musicpd.org
2168                 url => 'https://svn.musicpd.org',
2169                 # svn-remote.svn.fetch=mpd/trunk:trunk
2170                 fetch => {
2171                         'mpd/trunk' => 'trunk',
2172                 },
2173                 # svn-remote.svn.tags=mpd/tags/*:tags/*
2174                 tags => {
2175                         path => {
2176                                 left => 'mpd/tags',
2177                                 right => '',
2178                                 regex => qr!mpd/tags/([^/]+)$!,
2179                                 glob => 'tags/*',
2180                         },
2181                         ref => {
2182                                 left => 'tags',
2183                                 right => '',
2184                                 regex => qr!tags/([^/]+)$!,
2185                                 glob => 'tags/*',
2186                         },
2187                 }
2188         }
2189 };
2190
2191 $log_entry hashref as returned by libsvn_log_entry()
2192 {
2193         log => 'whitespace-formatted log entry
2194 ',                                              # trailing newline is preserved
2195         revision => '8',                        # integer
2196         date => '2004-02-24T17:01:44.108345Z',  # commit date
2197         author => 'committer name'
2198 };
2199
2200
2201 # this is generated by generate_diff();
2202 @mods = array of diff-index line hashes, each element represents one line
2203         of diff-index output
2204
2205 diff-index line ($m hash)
2206 {
2207         mode_a => first column of diff-index output, no leading ':',
2208         mode_b => second column of diff-index output,
2209         sha1_b => sha1sum of the final blob,
2210         chg => change type [MCRADT],
2211         file_a => original file name of a file (iff chg is 'C' or 'R')
2212         file_b => new/current file name of a file (any chg)
2213 }
2214 ;
2215
2216 # retval of read_url_paths{,_all}();
2217 $l_map = {
2218         # repository root url
2219         'https://svn.musicpd.org' => {
2220                 # repository path               # GIT_SVN_ID
2221                 'mpd/trunk'             =>      'trunk',
2222                 'mpd/tags/0.11.5'       =>      'tags/0.11.5',
2223         },
2224 }
2225
2226 Notes:
2227         I don't trust the each() function on unless I created %hash myself
2228         because the internal iterator may not have started at base.