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 Digest::MD5;
  15 use IO::File qw//;
  16 use File::Basename qw/dirname basename/;
  17 use File::Path qw/mkpath/;
  18 use File::Spec;
  19 use File::Find;
  20 use Getopt::Long qw/:config gnu_getopt no_ignore_case auto_abbrev/;
  21 use IPC::Open3;
  22 use Memoize;
  23
  24 use Git::SVN;
  25 use Git::SVN::Editor;
  26 use Git::SVN::Fetcher;
  27 use Git::SVN::Ra;
  28 use Git::SVN::Prompt;
  29 use Git::SVN::Log;
  30 use Git::SVN::Migration;
  31
  32 use Git::SVN::Utils qw(
  33         fatal
  34         can_compress
  35         canonicalize_path
  36         canonicalize_url
  37         join_paths
  38         add_path_to_url
  39         join_paths
  40 );
  41
  42 use Git qw(
  43         git_cmd_try
  44         command
  45         command_oneline
  46         command_noisy
  47         command_output_pipe
  48         command_close_pipe
  49         command_bidi_pipe
  50         command_close_bidi_pipe
  51 );
  52
  53 BEGIN {
  54         Memoize::memoize 'Git::config';
  55         Memoize::memoize 'Git::config_bool';
  56 }
  57
  58
  59 # From which subdir have we been invoked?
  60 my $cmd_dir_prefix = eval {
  61         command_oneline([qw/rev-parse --show-prefix/], STDERR => 0)
  62 } || '';
  63
  64 my $git_dir_user_set = 1 if defined $ENV{GIT_DIR};
  65 $ENV{GIT_DIR} ||= '.git';
  66 $Git::SVN::Ra::_log_window_size = 100;
  67
  68 if (! exists $ENV{SVN_SSH} && exists $ENV{GIT_SSH}) {
  69         $ENV{SVN_SSH} = $ENV{GIT_SSH};
  70 }
  71
  72 if (exists $ENV{SVN_SSH} && $^O eq 'msys') {
  73         $ENV{SVN_SSH} =~ s/\\/\\\\/g;
  74         $ENV{SVN_SSH} =~ s/(.*)/"$1"/;
  75 }
  76
  77 $Git::SVN::Log::TZ = $ENV{TZ};
  78 $ENV{TZ} = 'UTC';
  79 $| = 1; # unbuffer STDOUT
  80
  81 # All SVN commands do it.  Otherwise we may die on SIGPIPE when the remote
  82 # repository decides to close the connection which we expect to be kept alive.
  83 $SIG{PIPE} = 'IGNORE';
  84
  85 # Given a dot separated version number, "subtract" it from
  86 # the SVN::Core::VERSION; non-negaitive return means the SVN::Core
  87 # is at least at the version the caller asked for.
  88 sub compare_svn_version {
  89         my (@ours) = split(/\./, $SVN::Core::VERSION);
  90         my (@theirs) = split(/\./, $_[0]);
  91         my ($i, $diff);
  92
  93         for ($i = 0; $i < @ours && $i < @theirs; $i++) {
  94                 $diff = $ours[$i] - $theirs[$i];
  95                 return $diff if ($diff);
  96         }
  97         return 1 if ($i < @ours);
  98         return -1 if ($i < @theirs);
  99         return 0;
 100 }
 101
 102 sub _req_svn {
 103         require SVN::Core; # use()-ing this causes segfaults for me... *shrug*
 104         require SVN::Ra;
 105         require SVN::Delta;
 106         if (::compare_svn_version('1.1.0') < 0) {
 107                 fatal "Need SVN::Core 1.1.0 or better (got $SVN::Core::VERSION)";
 108         }
 109 }
 110
 111 $sha1 = qr/[a-f\d]{40}/;
 112 $sha1_short = qr/[a-f\d]{4,40}/;
 113 my ($_stdin, $_help, $_edit,
 114         $_message, $_file, $_branch_dest,
 115         $_template, $_shared,
 116         $_version, $_fetch_all, $_no_rebase, $_fetch_parent,
 117         $_before, $_after,
 118         $_merge, $_strategy, $_preserve_merges, $_dry_run, $_local,
 119         $_prefix, $_no_checkout, $_url, $_verbose,
 120         $_commit_url, $_tag, $_merge_info, $_interactive);
 121
 122 # This is a refactoring artifact so Git::SVN can get at this git-svn switch.
 123 sub opt_prefix { return $_prefix || '' }
 124
 125 $Git::SVN::Fetcher::_placeholder_filename = ".gitignore";
 126 $_q ||= 0;
 127 my %remote_opts = ( 'username=s' => \$Git::SVN::Prompt::_username,
 128                     'config-dir=s' => \$Git::SVN::Ra::config_dir,
 129                     'no-auth-cache' => \$Git::SVN::Prompt::_no_auth_cache,
 130                     'ignore-paths=s' => \$Git::SVN::Fetcher::_ignore_regex,
 131                     'ignore-refs=s' => \$Git::SVN::Ra::_ignore_refs_regex );
 132 my %fc_opts = ( 'follow-parent|follow!' => \$Git::SVN::_follow_parent,
 133                 'authors-file|A=s' => \$_authors,
 134                 'authors-prog=s' => \$_authors_prog,
 135                 'repack:i' => \$Git::SVN::_repack,
 136                 'noMetadata' => \$Git::SVN::_no_metadata,
 137                 'useSvmProps' => \$Git::SVN::_use_svm_props,
 138                 'useSvnsyncProps' => \$Git::SVN::_use_svnsync_props,
 139                 'log-window-size=i' => \$Git::SVN::Ra::_log_window_size,
 140                 'no-checkout' => \$_no_checkout,
 141                 'quiet|q+' => \$_q,
 142                 'repack-flags|repack-args|repack-opts=s' =>
 143                    \$Git::SVN::_repack_flags,
 144                 'use-log-author' => \$Git::SVN::_use_log_author,
 145                 'add-author-from' => \$Git::SVN::_add_author_from,
 146                 'localtime' => \$Git::SVN::_localtime,
 147                 %remote_opts );
 148
 149 my ($_trunk, @_tags, @_branches, $_stdlayout);
 150 my %icv;
 151 my %init_opts = ( 'template=s' => \$_template, 'shared:s' => \$_shared,
 152                   'trunk|T=s' => \$_trunk, 'tags|t=s@' => \@_tags,
 153                   'branches|b=s@' => \@_branches, 'prefix=s' => \$_prefix,
 154                   'stdlayout|s' => \$_stdlayout,
 155                   'minimize-url|m!' => \$Git::SVN::_minimize_url,
 156                   'no-metadata' => sub { $icv{noMetadata} = 1 },
 157                   'use-svm-props' => sub { $icv{useSvmProps} = 1 },
 158                   'use-svnsync-props' => sub { $icv{useSvnsyncProps} = 1 },
 159                   'rewrite-root=s' => sub { $icv{rewriteRoot} = $_[1] },
 160                   'rewrite-uuid=s' => sub { $icv{rewriteUUID} = $_[1] },
 161                   %remote_opts );
 162 my %cmt_opts = ( 'edit|e' => \$_edit,
 163                 'rmdir' => \$Git::SVN::Editor::_rmdir,
 164                 'find-copies-harder' => \$Git::SVN::Editor::_find_copies_harder,
 165                 'l=i' => \$Git::SVN::Editor::_rename_limit,
 166                 'copy-similarity|C=i'=> \$Git::SVN::Editor::_cp_similarity
 167 );
 168
 169 my %cmd = (
 170         fetch => [ \&cmd_fetch, "Download new revisions from SVN",
 171                         { 'revision|r=s' => \$_revision,
 172                           'fetch-all|all' => \$_fetch_all,
 173                           'parent|p' => \$_fetch_parent,
 174                            %fc_opts } ],
 175         clone => [ \&cmd_clone, "Initialize and fetch revisions",
 176                         { 'revision|r=s' => \$_revision,
 177                           'preserve-empty-dirs' =>
 178                                 \$Git::SVN::Fetcher::_preserve_empty_dirs,
 179                           'placeholder-filename=s' =>
 180                                 \$Git::SVN::Fetcher::_placeholder_filename,
 181                            %fc_opts, %init_opts } ],
 182         init => [ \&cmd_init, "Initialize a repo for tracking" .
 183                           " (requires URL argument)",
 184                           \%init_opts ],
 185         'multi-init' => [ \&cmd_multi_init,
 186                           "Deprecated alias for ".
 187                           "'$0 init -T<trunk> -b<branches> -t<tags>'",
 188                           \%init_opts ],
 189         dcommit => [ \&cmd_dcommit,
 190                      'Commit several diffs to merge with upstream',
 191                         { 'merge|m|M' => \$_merge,
 192                           'strategy|s=s' => \$_strategy,
 193                           'verbose|v' => \$_verbose,
 194                           'dry-run|n' => \$_dry_run,
 195                           'fetch-all|all' => \$_fetch_all,
 196                           'commit-url=s' => \$_commit_url,
 197                           'revision|r=i' => \$_revision,
 198                           'no-rebase' => \$_no_rebase,
 199                           'mergeinfo=s' => \$_merge_info,
 200                           'interactive|i' => \$_interactive,
 201                         %cmt_opts, %fc_opts } ],
 202         branch => [ \&cmd_branch,
 203                     'Create a branch in the SVN repository',
 204                     { 'message|m=s' => \$_message,
 205                       'destination|d=s' => \$_branch_dest,
 206                       'dry-run|n' => \$_dry_run,
 207                       'tag|t' => \$_tag,
 208                       'username=s' => \$Git::SVN::Prompt::_username,
 209                       'commit-url=s' => \$_commit_url } ],
 210         tag => [ sub { $_tag = 1; cmd_branch(@_) },
 211                  'Create a tag in the SVN repository',
 212                  { 'message|m=s' => \$_message,
 213                    'destination|d=s' => \$_branch_dest,
 214                    'dry-run|n' => \$_dry_run,
 215                    'username=s' => \$Git::SVN::Prompt::_username,
 216                    'commit-url=s' => \$_commit_url } ],
 217         'set-tree' => [ \&cmd_set_tree,
 218                         "Set an SVN repository to a git tree-ish",
 219                         { 'stdin' => \$_stdin, %cmt_opts, %fc_opts, } ],
 220         'create-ignore' => [ \&cmd_create_ignore,
 221                              'Create a .gitignore per svn:ignore',
 222                              { 'revision|r=i' => \$_revision
 223                              } ],
 224         'mkdirs' => [ \&cmd_mkdirs ,
 225                       "recreate empty directories after a checkout",
 226                       { 'revision|r=i' => \$_revision } ],
 227         'propget' => [ \&cmd_propget,
 228                        'Print the value of a property on a file or directory',
 229                        { 'revision|r=i' => \$_revision } ],
 230         'proplist' => [ \&cmd_proplist,
 231                        'List all properties of a file or directory',
 232                        { 'revision|r=i' => \$_revision } ],
 233         'show-ignore' => [ \&cmd_show_ignore, "Show svn:ignore listings",
 234                         { 'revision|r=i' => \$_revision
 235                         } ],
 236         'show-externals' => [ \&cmd_show_externals, "Show svn:externals listings",
 237                         { 'revision|r=i' => \$_revision
 238                         } ],
 239         'multi-fetch' => [ \&cmd_multi_fetch,
 240                            "Deprecated alias for $0 fetch --all",
 241                            { 'revision|r=s' => \$_revision, %fc_opts } ],
 242         'migrate' => [ sub { },
 243                        # no-op, we automatically run this anyways,
 244                        'Migrate configuration/metadata/layout from
 245                         previous versions of git-svn',
 246                        { 'minimize' => \$Git::SVN::Migration::_minimize,
 247                          %remote_opts } ],
 248         'log' => [ \&Git::SVN::Log::cmd_show_log, 'Show commit logs',
 249                         { 'limit=i' => \$Git::SVN::Log::limit,
 250                           'revision|r=s' => \$_revision,
 251                           'verbose|v' => \$Git::SVN::Log::verbose,
 252                           'incremental' => \$Git::SVN::Log::incremental,
 253                           'oneline' => \$Git::SVN::Log::oneline,
 254                           'show-commit' => \$Git::SVN::Log::show_commit,
 255                           'non-recursive' => \$Git::SVN::Log::non_recursive,
 256                           'authors-file|A=s' => \$_authors,
 257                           'color' => \$Git::SVN::Log::color,
 258                           'pager=s' => \$Git::SVN::Log::pager
 259                         } ],
 260         'find-rev' => [ \&cmd_find_rev,
 261                         "Translate between SVN revision numbers and tree-ish",
 262                         { 'before' => \$_before,
 263                           'after' => \$_after } ],
 264         'rebase' => [ \&cmd_rebase, "Fetch and rebase your working directory",
 265                         { 'merge|m|M' => \$_merge,
 266                           'verbose|v' => \$_verbose,
 267                           'strategy|s=s' => \$_strategy,
 268                           'local|l' => \$_local,
 269                           'fetch-all|all' => \$_fetch_all,
 270                           'dry-run|n' => \$_dry_run,
 271                           'preserve-merges|p' => \$_preserve_merges,
 272                           %fc_opts } ],
 273         'commit-diff' => [ \&cmd_commit_diff,
 274                            'Commit a diff between two trees',
 275                         { 'message|m=s' => \$_message,
 276                           'file|F=s' => \$_file,
 277                           'revision|r=s' => \$_revision,
 278                         %cmt_opts } ],
 279         'info' => [ \&cmd_info,
 280                     "Show info about the latest SVN revision
 281                      on the current branch",
 282                     { 'url' => \$_url, } ],
 283         'blame' => [ \&Git::SVN::Log::cmd_blame,
 284                     "Show what revision and author last modified each line of a file",
 285                     { 'git-format' => \$Git::SVN::Log::_git_format } ],
 286         'reset' => [ \&cmd_reset,
 287                      "Undo fetches back to the specified SVN revision",
 288                      { 'revision|r=s' => \$_revision,
 289                        'parent|p' => \$_fetch_parent } ],
 290         'gc' => [ \&cmd_gc,
 291                   "Compress unhandled.log files in .git/svn and remove " .
 292                   "index files in .git/svn",
 293                 {} ],
 294 );
 295
 296 use Term::ReadLine;
 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 = eval {
 309         $ENV{"GIT_SVN_NOTTY"}
 310                 ? new Term::ReadLine 'git-svn', \*STDIN, \*STDOUT
 311                 : new Term::ReadLine 'git-svn';
 312 };
 313 if ($@) {
 314         $term = new FakeTerm "$@: going non-interactive";
 315 }
 316
 317 my $cmd;
 318 for (my $i = 0; $i < @ARGV; $i++) {
 319         if (defined $cmd{$ARGV[$i]}) {
 320                 $cmd = $ARGV[$i];
 321                 splice @ARGV, $i, 1;
 322                 last;
 323         } elsif ($ARGV[$i] eq 'help') {
 324                 $cmd = $ARGV[$i+1];
 325                 usage(0);
 326         }
 327 };
 328
 329 # make sure we're always running at the top-level working directory
 330 unless ($cmd && $cmd =~ /(?:clone|init|multi-init)$/) {
 331         unless (-d $ENV{GIT_DIR}) {
 332                 if ($git_dir_user_set) {
 333                         die "GIT_DIR=$ENV{GIT_DIR} explicitly set, ",
 334                             "but it is not a directory\n";
 335                 }
 336                 my $git_dir = delete $ENV{GIT_DIR};
 337                 my $cdup = undef;
 338                 git_cmd_try {
 339                         $cdup = command_oneline(qw/rev-parse --show-cdup/);
 340                         $git_dir = '.' unless ($cdup);
 341                         chomp $cdup if ($cdup);
 342                         $cdup = "." unless ($cdup && length $cdup);
 343                 } "Already at toplevel, but $git_dir not found\n";
 344                 chdir $cdup or die "Unable to chdir up to '$cdup'\n";
 345                 unless (-d $git_dir) {
 346                         die "$git_dir still not found after going to ",
 347                             "'$cdup'\n";
 348                 }
 349                 $ENV{GIT_DIR} = $git_dir;
 350         }
 351         $_repository = Git->repository(Repository => $ENV{GIT_DIR});
 352 }
 353
 354 my %opts = %{$cmd{$cmd}->[2]} if (defined $cmd);
 355
 356 read_git_config(\%opts);
 357 if ($cmd && ($cmd eq 'log' || $cmd eq 'blame')) {
 358         Getopt::Long::Configure('pass_through');
 359 }
 360 my $rv = GetOptions(%opts, 'h|H' => \$_help, 'version|V' => \$_version,
 361                     'minimize-connections' => \$Git::SVN::Migration::_minimize,
 362                     'id|i=s' => \$Git::SVN::default_ref_id,
 363                     'svn-remote|remote|R=s' => sub {
 364                        $Git::SVN::no_reuse_existing = 1;
 365                        $Git::SVN::default_repo_id = $_[1] });
 366 exit 1 if (!$rv && $cmd && $cmd ne 'log');
 367
 368 usage(0) if $_help;
 369 version() if $_version;
 370 usage(1) unless defined $cmd;
 371 load_authors() if $_authors;
 372 if (defined $_authors_prog) {
 373         $_authors_prog = "'" . File::Spec->rel2abs($_authors_prog) . "'";
 374 }
 375
 376 unless ($cmd =~ /^(?:clone|init|multi-init|commit-diff)$/) {
 377         Git::SVN::Migration::migration_check();
 378 }
 379 Git::SVN::init_vars();
 380 eval {
 381         Git::SVN::verify_remotes_sanity();
 382         $cmd{$cmd}->[0]->(@ARGV);
 383         post_fetch_checkout();
 384 };
 385 fatal $@ if $@;
 386 exit 0;
 387
 388 ####################### primary functions ######################
 389 sub usage {
 390         my $exit = shift || 0;
 391         my $fd = $exit ? \*STDERR : \*STDOUT;
 392         print $fd <<"";
 393 git-svn - bidirectional operations between a single Subversion tree and git
 394 Usage: git svn <command> [options] [arguments]\n
 395
 396         print $fd "Available commands:\n" unless $cmd;
 397
 398         foreach (sort keys %cmd) {
 399                 next if $cmd && $cmd ne $_;
 400                 next if /^multi-/; # don't show deprecated commands
 401                 print $fd '  ',pack('A17',$_),$cmd{$_}->[1],"\n";
 402                 foreach (sort keys %{$cmd{$_}->[2]}) {
 403                         # mixed-case options are for .git/config only
 404                         next if /[A-Z]/ && /^[a-z]+$/i;
 405                         # prints out arguments as they should be passed:
 406                         my $x = s#[:=]s$## ? '<arg>' : s#[:=]i$## ? '<num>' : '';
 407                         print $fd ' ' x 21, join(', ', map { length $_ > 1 ?
 408                                                         "--$_" : "-$_" }
 409                                                 split /\|/,$_)," $x\n";
 410                 }
 411         }
 412         print $fd <<"";
 413 \nGIT_SVN_ID may be set in the environment or via the --id/-i switch to an
 414 arbitrary identifier if you're tracking multiple SVN branches/repositories in
 415 one git repository and want to keep them separate.  See git-svn(1) for more
 416 information.
 417
 418         exit $exit;
 419 }
 420
 421 sub version {
 422         ::_req_svn();
 423         print "git-svn version $VERSION (svn $SVN::Core::VERSION)\n";
 424         exit 0;
 425 }
 426
 427 sub ask {
 428         my ($prompt, %arg) = @_;
 429         my $valid_re = $arg{valid_re};
 430         my $default = $arg{default};
 431         my $resp;
 432         my $i = 0;
 433
 434         if ( !( defined($term->IN)
 435             && defined( fileno($term->IN) )
 436             && defined( $term->OUT )
 437             && defined( fileno($term->OUT) ) ) ){
 438                 return defined($default) ? $default : undef;
 439         }
 440
 441         while ($i++ < 10) {
 442                 $resp = $term->readline($prompt);
 443                 if (!defined $resp) { # EOF
 444                         print "\n";
 445                         return defined $default ? $default : undef;
 446                 }
 447                 if ($resp eq '' and defined $default) {
 448                         return $default;
 449                 }
 450                 if (!defined $valid_re or $resp =~ /$valid_re/) {
 451                         return $resp;
 452                 }
 453         }
 454         return undef;
 455 }
 456
 457 sub do_git_init_db {
 458         unless (-d $ENV{GIT_DIR}) {
 459                 my @init_db = ('init');
 460                 push @init_db, "--template=$_template" if defined $_template;
 461                 if (defined $_shared) {
 462                         if ($_shared =~ /[a-z]/) {
 463                                 push @init_db, "--shared=$_shared";
 464                         } else {
 465                                 push @init_db, "--shared";
 466                         }
 467                 }
 468                 command_noisy(@init_db);
 469                 $_repository = Git->repository(Repository => ".git");
 470         }
 471         my $set;
 472         my $pfx = "svn-remote.$Git::SVN::default_repo_id";
 473         foreach my $i (keys %icv) {
 474                 die "'$set' and '$i' cannot both be set\n" if $set;
 475                 next unless defined $icv{$i};
 476                 command_noisy('config', "$pfx.$i", $icv{$i});
 477                 $set = $i;
 478         }
 479         my $ignore_paths_regex = \$Git::SVN::Fetcher::_ignore_regex;
 480         command_noisy('config', "$pfx.ignore-paths", $$ignore_paths_regex)
 481                 if defined $$ignore_paths_regex;
 482         my $ignore_refs_regex = \$Git::SVN::Ra::_ignore_refs_regex;
 483         command_noisy('config', "$pfx.ignore-refs", $$ignore_refs_regex)
 484                 if defined $$ignore_refs_regex;
 485
 486         if (defined $Git::SVN::Fetcher::_preserve_empty_dirs) {
 487                 my $fname = \$Git::SVN::Fetcher::_placeholder_filename;
 488                 command_noisy('config', "$pfx.preserve-empty-dirs", 'true');
 489                 command_noisy('config', "$pfx.placeholder-filename", $$fname);
 490         }
 491 }
 492
 493 sub init_subdir {
 494         my $repo_path = shift or return;
 495         mkpath([$repo_path]) unless -d $repo_path;
 496         chdir $repo_path or die "Couldn't chdir to $repo_path: $!\n";
 497         $ENV{GIT_DIR} = '.git';
 498         $_repository = Git->repository(Repository => $ENV{GIT_DIR});
 499 }
 500
 501 sub cmd_clone {
 502         my ($url, $path) = @_;
 503         if (!defined $path &&
 504             (defined $_trunk || @_branches || @_tags ||
 505              defined $_stdlayout) &&
 506             $url !~ m#^[a-z\+]+://#) {
 507                 $path = $url;
 508         }
 509         $path = basename($url) if !defined $path || !length $path;
 510         my $authors_absolute = $_authors ? File::Spec->rel2abs($_authors) : "";
 511         cmd_init($url, $path);
 512         command_oneline('config', 'svn.authorsfile', $authors_absolute)
 513             if $_authors;
 514         Git::SVN::fetch_all($Git::SVN::default_repo_id);
 515 }
 516
 517 sub cmd_init {
 518         if (defined $_stdlayout) {
 519                 $_trunk = 'trunk' if (!defined $_trunk);
 520                 @_tags = 'tags' if (! @_tags);
 521                 @_branches = 'branches' if (! @_branches);
 522         }
 523         if (defined $_trunk || @_branches || @_tags) {
 524                 return cmd_multi_init(@_);
 525         }
 526         my $url = shift or die "SVN repository location required ",
 527                                "as a command-line argument\n";
 528         $url = canonicalize_url($url);
 529         init_subdir(@_);
 530         do_git_init_db();
 531
 532         if ($Git::SVN::_minimize_url eq 'unset') {
 533                 $Git::SVN::_minimize_url = 0;
 534         }
 535
 536         Git::SVN->init($url);
 537 }
 538
 539 sub cmd_fetch {
 540         if (grep /^\d+=./, @_) {
 541                 die "'<rev>=<commit>' fetch arguments are ",
 542                     "no longer supported.\n";
 543         }
 544         my ($remote) = @_;
 545         if (@_ > 1) {
 546                 die "Usage: $0 fetch [--all] [--parent] [svn-remote]\n";
 547         }
 548         $Git::SVN::no_reuse_existing = undef;
 549         if ($_fetch_parent) {
 550                 my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
 551                 unless ($gs) {
 552                         die "Unable to determine upstream SVN information from ",
 553                             "working tree history\n";
 554                 }
 555                 # just fetch, don't checkout.
 556                 $_no_checkout = 'true';
 557                 $_fetch_all ? $gs->fetch_all : $gs->fetch;
 558         } elsif ($_fetch_all) {
 559                 cmd_multi_fetch();
 560         } else {
 561                 $remote ||= $Git::SVN::default_repo_id;
 562                 Git::SVN::fetch_all($remote, Git::SVN::read_all_remotes());
 563         }
 564 }
 565
 566 sub cmd_set_tree {
 567         my (@commits) = @_;
 568         if ($_stdin || !@commits) {
 569                 print "Reading from stdin...\n";
 570                 @commits = ();
 571                 while (<STDIN>) {
 572                         if (/\b($sha1_short)\b/o) {
 573                                 unshift @commits, $1;
 574                         }
 575                 }
 576         }
 577         my @revs;
 578         foreach my $c (@commits) {
 579                 my @tmp = command('rev-parse',$c);
 580                 if (scalar @tmp == 1) {
 581                         push @revs, $tmp[0];
 582                 } elsif (scalar @tmp > 1) {
 583                         push @revs, reverse(command('rev-list',@tmp));
 584                 } else {
 585                         fatal "Failed to rev-parse $c";
 586                 }
 587         }
 588         my $gs = Git::SVN->new;
 589         my ($r_last, $cmt_last) = $gs->last_rev_commit;
 590         $gs->fetch;
 591         if (defined $gs->{last_rev} && $r_last != $gs->{last_rev}) {
 592                 fatal "There are new revisions that were fetched ",
 593                       "and need to be merged (or acknowledged) ",
 594                       "before committing.\nlast rev: $r_last\n",
 595                       " current: $gs->{last_rev}";
 596         }
 597         $gs->set_tree($_) foreach @revs;
 598         print "Done committing ",scalar @revs," revisions to SVN\n";
 599         unlink $gs->{index};
 600 }
 601
 602 sub split_merge_info_range {
 603         my ($range) = @_;
 604         if ($range =~ /(\d+)-(\d+)/) {
 605                 return (int($1), int($2));
 606         } else {
 607                 return (int($range), int($range));
 608         }
 609 }
 610
 611 sub combine_ranges {
 612         my ($in) = @_;
 613
 614         my @fnums = ();
 615         my @arr = split(/,/, $in);
 616         for my $element (@arr) {
 617                 my ($start, $end) = split_merge_info_range($element);
 618                 push @fnums, $start;
 619         }
 620
 621         my @sorted = @arr [ sort {
 622                 $fnums[$a] <=> $fnums[$b]
 623         } 0..$#arr ];
 624
 625         my @return = ();
 626         my $last = -1;
 627         my $first = -1;
 628         for my $element (@sorted) {
 629                 my ($start, $end) = split_merge_info_range($element);
 630
 631                 if ($last == -1) {
 632                         $first = $start;
 633                         $last = $end;
 634                         next;
 635                 }
 636                 if ($start <= $last+1) {
 637                         if ($end > $last) {
 638                                 $last = $end;
 639                         }
 640                         next;
 641                 }
 642                 if ($first == $last) {
 643                         push @return, "$first";
 644                 } else {
 645                         push @return, "$first-$last";
 646                 }
 647                 $first = $start;
 648                 $last = $end;
 649         }
 650
 651         if ($first != -1) {
 652                 if ($first == $last) {
 653                         push @return, "$first";
 654                 } else {
 655                         push @return, "$first-$last";
 656                 }
 657         }
 658
 659         return join(',', @return);
 660 }
 661
 662 sub merge_revs_into_hash {
 663         my ($hash, $minfo) = @_;
 664         my @lines = split(' ', $minfo);
 665
 666         for my $line (@lines) {
 667                 my ($branchpath, $revs) = split(/:/, $line);
 668
 669                 if (exists($hash->{$branchpath})) {
 670                         # Merge the two revision sets
 671                         my $combined = "$hash->{$branchpath},$revs";
 672                         $hash->{$branchpath} = combine_ranges($combined);
 673                 } else {
 674                         # Just do range combining for consolidation
 675                         $hash->{$branchpath} = combine_ranges($revs);
 676                 }
 677         }
 678 }
 679
 680 sub merge_merge_info {
 681         my ($mergeinfo_one, $mergeinfo_two) = @_;
 682         my %result_hash = ();
 683
 684         merge_revs_into_hash(\%result_hash, $mergeinfo_one);
 685         merge_revs_into_hash(\%result_hash, $mergeinfo_two);
 686
 687         my $result = '';
 688         # Sort below is for consistency's sake
 689         for my $branchname (sort keys(%result_hash)) {
 690                 my $revlist = $result_hash{$branchname};
 691                 $result .= "$branchname:$revlist\n"
 692         }
 693         return $result;
 694 }
 695
 696 sub populate_merge_info {
 697         my ($d, $gs, $uuid, $linear_refs, $rewritten_parent) = @_;
 698
 699         my %parentshash;
 700         read_commit_parents(\%parentshash, $d);
 701         my @parents = @{$parentshash{$d}};
 702         if ($#parents > 0) {
 703                 # Merge commit
 704                 my $all_parents_ok = 1;
 705                 my $aggregate_mergeinfo = '';
 706                 my $rooturl = $gs->repos_root;
 707
 708                 if (defined($rewritten_parent)) {
 709                         # Replace first parent with newly-rewritten version
 710                         shift @parents;
 711                         unshift @parents, $rewritten_parent;
 712                 }
 713
 714                 foreach my $parent (@parents) {
 715                         my ($branchurl, $svnrev, $paruuid) =
 716                                 cmt_metadata($parent);
 717
 718                         unless (defined($svnrev)) {
 719                                 # Should have been caught be preflight check
 720                                 fatal "merge commit $d has ancestor $parent, but that change "
 721                      ."does not have git-svn metadata!";
 722                         }
 723                         unless ($branchurl =~ /^\Q$rooturl\E(.*)/) {
 724                                 fatal "commit $parent git-svn metadata changed mid-run!";
 725                         }
 726                         my $branchpath = $1;
 727
 728                         my $ra = Git::SVN::Ra->new($branchurl);
 729                         my (undef, undef, $props) =
 730                                 $ra->get_dir(canonicalize_path("."), $svnrev);
 731                         my $par_mergeinfo = $props->{'svn:mergeinfo'};
 732                         unless (defined $par_mergeinfo) {
 733                                 $par_mergeinfo = '';
 734                         }
 735                         # Merge previous mergeinfo values
 736                         $aggregate_mergeinfo =
 737                                 merge_merge_info($aggregate_mergeinfo,
 738                                                                  $par_mergeinfo, 0);
 739
 740                         next if $parent eq $parents[0]; # Skip first parent
 741                         # Add new changes being placed in tree by merge
 742                         my @cmd = (qw/rev-list --reverse/,
 743                                            $parent, qw/--not/);
 744                         foreach my $par (@parents) {
 745                                 unless ($par eq $parent) {
 746                                         push @cmd, $par;
 747                                 }
 748                         }
 749                         my @revsin = ();
 750                         my ($revlist, $ctx) = command_output_pipe(@cmd);
 751                         while (<$revlist>) {
 752                                 my $irev = $_;
 753                                 chomp $irev;
 754                                 my (undef, $csvnrev, undef) =
 755                                         cmt_metadata($irev);
 756                                 unless (defined $csvnrev) {
 757                                         # A child is missing SVN annotations...
 758                                         # this might be OK, or might not be.
 759                                         warn "W:child $irev is merged into revision "
 760                                                  ."$d but does not have git-svn metadata. "
 761                                                  ."This means git-svn cannot determine the "
 762                                                  ."svn revision numbers to place into the "
 763                                                  ."svn:mergeinfo property. You must ensure "
 764                                                  ."a branch is entirely committed to "
 765                                                  ."SVN before merging it in order for "
 766                                                  ."svn:mergeinfo population to function "
 767                                                  ."properly";
 768                                 }
 769                                 push @revsin, $csvnrev;
 770                         }
 771                         command_close_pipe($revlist, $ctx);
 772
 773                         last unless $all_parents_ok;
 774
 775                         # We now have a list of all SVN revnos which are
 776                         # merged by this particular parent. Integrate them.
 777                         next if $#revsin == -1;
 778                         my $newmergeinfo = "$branchpath:" . join(',', @revsin);
 779                         $aggregate_mergeinfo =
 780                                 merge_merge_info($aggregate_mergeinfo,
 781                                                                  $newmergeinfo, 1);
 782                 }
 783                 if ($all_parents_ok and $aggregate_mergeinfo) {
 784                         return $aggregate_mergeinfo;
 785                 }
 786         }
 787
 788         return undef;
 789 }
 790
 791 sub dcommit_rebase {
 792         my ($is_last, $current, $fetched_ref, $svn_error) = @_;
 793         my @diff;
 794
 795         if ($svn_error) {
 796                 print STDERR "\nERROR from SVN:\n",
 797                                 $svn_error->expanded_message, "\n";
 798         }
 799         unless ($_no_rebase) {
 800                 # we always want to rebase against the current HEAD,
 801                 # not any head that was passed to us
 802                 @diff = command('diff-tree', $current,
 803                            $fetched_ref, '--');
 804                 my @finish;
 805                 if (@diff) {
 806                         @finish = rebase_cmd();
 807                         print STDERR "W: $current and ", $fetched_ref,
 808                                      " differ, using @finish:\n",
 809                                      join("\n", @diff), "\n";
 810                 } elsif ($is_last) {
 811                         print "No changes between ", $current, " and ",
 812                               $fetched_ref,
 813                               "\nResetting to the latest ",
 814                               $fetched_ref, "\n";
 815                         @finish = qw/reset --mixed/;
 816                 }
 817                 command_noisy(@finish, $fetched_ref) if @finish;
 818         }
 819         if ($svn_error) {
 820                 die "ERROR: Not all changes have been committed into SVN"
 821                         .($_no_rebase ? ".\n" : ", however the committed\n"
 822                         ."ones (if any) seem to be successfully integrated "
 823                         ."into the working tree.\n")
 824                         ."Please see the above messages for details.\n";
 825         }
 826         return @diff;
 827 }
 828
 829 sub cmd_dcommit {
 830         my $head = shift;
 831         command_noisy(qw/update-index --refresh/);
 832         git_cmd_try { command_oneline(qw/diff-index --quiet HEAD/) }
 833                 'Cannot dcommit with a dirty index.  Commit your changes first, '
 834                 . "or stash them with `git stash'.\n";
 835         $head ||= 'HEAD';
 836
 837         my $old_head;
 838         if ($head ne 'HEAD') {
 839                 $old_head = eval {
 840                         command_oneline([qw/symbolic-ref -q HEAD/])
 841                 };
 842                 if ($old_head) {
 843                         $old_head =~ s{^refs/heads/}{};
 844                 } else {
 845                         $old_head = eval { command_oneline(qw/rev-parse HEAD/) };
 846                 }
 847                 command(['checkout', $head], STDERR => 0);
 848         }
 849
 850         my @refs;
 851         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD', \@refs);
 852         unless ($gs) {
 853                 die "Unable to determine upstream SVN information from ",
 854                     "$head history.\nPerhaps the repository is empty.";
 855         }
 856
 857         if (defined $_commit_url) {
 858                 $url = $_commit_url;
 859         } else {
 860                 $url = eval { command_oneline('config', '--get',
 861                               "svn-remote.$gs->{repo_id}.commiturl") };
 862                 if (!$url) {
 863                         $url = $gs->full_pushurl
 864                 }
 865         }
 866
 867         my $last_rev = $_revision if defined $_revision;
 868         if ($url) {
 869                 print "Committing to $url ...\n";
 870         }
 871         my ($linear_refs, $parents) = linearize_history($gs, \@refs);
 872         if ($_no_rebase && scalar(@$linear_refs) > 1) {
 873                 warn "Attempting to commit more than one change while ",
 874                      "--no-rebase is enabled.\n",
 875                      "If these changes depend on each other, re-running ",
 876                      "without --no-rebase may be required."
 877         }
 878
 879         if (defined $_interactive){
 880                 my $ask_default = "y";
 881                 foreach my $d (@$linear_refs){
 882                         my ($fh, $ctx) = command_output_pipe(qw(show --summary), "$d");
 883                         while (<$fh>){
 884                                 print $_;
 885                         }
 886                         command_close_pipe($fh, $ctx);
 887                         $_ = ask("Commit this patch to SVN? ([y]es (default)|[n]o|[q]uit|[a]ll): ",
 888                                  valid_re => qr/^(?:yes|y|no|n|quit|q|all|a)/i,
 889                                  default => $ask_default);
 890                         die "Commit this patch reply required" unless defined $_;
 891                         if (/^[nq]/i) {
 892                                 exit(0);
 893                         } elsif (/^a/i) {
 894                                 last;
 895                         }
 896                 }
 897         }
 898
 899         my $expect_url = $url;
 900
 901         my $push_merge_info = eval {
 902                 command_oneline(qw/config --get svn.pushmergeinfo/)
 903                 };
 904         if (not defined($push_merge_info)
 905                         or $push_merge_info eq "false"
 906                         or $push_merge_info eq "no"
 907                         or $push_merge_info eq "never") {
 908                 $push_merge_info = 0;
 909         }
 910
 911         unless (defined($_merge_info) || ! $push_merge_info) {
 912                 # Preflight check of changes to ensure no issues with mergeinfo
 913                 # This includes check for uncommitted-to-SVN parents
 914                 # (other than the first parent, which we will handle),
 915                 # information from different SVN repos, and paths
 916                 # which are not underneath this repository root.
 917                 my $rooturl = $gs->repos_root;
 918                 foreach my $d (@$linear_refs) {
 919                         my %parentshash;
 920                         read_commit_parents(\%parentshash, $d);
 921                         my @realparents = @{$parentshash{$d}};
 922                         if ($#realparents > 0) {
 923                                 # Merge commit
 924                                 shift @realparents; # Remove/ignore first parent
 925                                 foreach my $parent (@realparents) {
 926                                         my ($branchurl, $svnrev, $paruuid) = cmt_metadata($parent);
 927                                         unless (defined $paruuid) {
 928                                                 # A parent is missing SVN annotations...
 929                                                 # abort the whole operation.
 930                                                 fatal "$parent is merged into revision $d, "
 931                                                          ."but does not have git-svn metadata. "
 932                                                          ."Either dcommit the branch or use a "
 933                                                          ."local cherry-pick, FF merge, or rebase "
 934                                                          ."instead of an explicit merge commit.";
 935                                         }
 936
 937                                         unless ($paruuid eq $uuid) {
 938                                                 # Parent has SVN metadata from different repository
 939                                                 fatal "merge parent $parent for change $d has "
 940                                                          ."git-svn uuid $paruuid, while current change "
 941                                                          ."has uuid $uuid!";
 942                                         }
 943
 944                                         unless ($branchurl =~ /^\Q$rooturl\E(.*)/) {
 945                                                 # This branch is very strange indeed.
 946                                                 fatal "merge parent $parent for $d is on branch "
 947                                                          ."$branchurl, which is not under the "
 948                                                          ."git-svn root $rooturl!";
 949                                         }
 950                                 }
 951                         }
 952                 }
 953         }
 954
 955         my $rewritten_parent;
 956         my $current_head = command_oneline(qw/rev-parse HEAD/);
 957         Git::SVN::remove_username($expect_url);
 958         if (defined($_merge_info)) {
 959                 $_merge_info =~ tr{ }{\n};
 960         }
 961         while (1) {
 962                 my $d = shift @$linear_refs or last;
 963                 unless (defined $last_rev) {
 964                         (undef, $last_rev, undef) = cmt_metadata("$d~1");
 965                         unless (defined $last_rev) {
 966                                 fatal "Unable to extract revision information ",
 967                                       "from commit $d~1";
 968                         }
 969                 }
 970                 if ($_dry_run) {
 971                         print "diff-tree $d~1 $d\n";
 972                 } else {
 973                         my $cmt_rev;
 974
 975                         unless (defined($_merge_info) || ! $push_merge_info) {
 976                                 $_merge_info = populate_merge_info($d, $gs,
 977                                                              $uuid,
 978                                                              $linear_refs,
 979                                                              $rewritten_parent);
 980                         }
 981
 982                         my %ed_opts = ( r => $last_rev,
 983                                         log => get_commit_entry($d)->{log},
 984                                         ra => Git::SVN::Ra->new($url),
 985                                         config => SVN::Core::config_get_config(
 986                                                 $Git::SVN::Ra::config_dir
 987                                         ),
 988                                         tree_a => "$d~1",
 989                                         tree_b => $d,
 990                                         editor_cb => sub {
 991                                                print "Committed r$_[0]\n";
 992                                                $cmt_rev = $_[0];
 993                                         },
 994                                         mergeinfo => $_merge_info,
 995                                         svn_path => '');
 996
 997                         my $err_handler = $SVN::Error::handler;
 998                         $SVN::Error::handler = sub {
 999                                 my $err = shift;
1000                                 dcommit_rebase(1, $current_head, $gs->refname,
1001                                         $err);
1002                         };
1003
1004                         if (!Git::SVN::Editor->new(\%ed_opts)->apply_diff) {
1005                                 print "No changes\n$d~1 == $d\n";
1006                         } elsif ($parents->{$d} && @{$parents->{$d}}) {
1007                                 $gs->{inject_parents_dcommit}->{$cmt_rev} =
1008                                                                $parents->{$d};
1009                         }
1010                         $_fetch_all ? $gs->fetch_all : $gs->fetch;
1011                         $SVN::Error::handler = $err_handler;
1012                         $last_rev = $cmt_rev;
1013                         next if $_no_rebase;
1014
1015                         my @diff = dcommit_rebase(@$linear_refs == 0, $d,
1016                                                 $gs->refname, undef);
1017
1018                         $rewritten_parent = command_oneline(qw/rev-parse/,
1019                                                         $gs->refname);
1020
1021                         if (@diff) {
1022                                 $current_head = command_oneline(qw/rev-parse
1023                                                                 HEAD/);
1024                                 @refs = ();
1025                                 my ($url_, $rev_, $uuid_, $gs_) =
1026                                               working_head_info('HEAD', \@refs);
1027                                 my ($linear_refs_, $parents_) =
1028                                               linearize_history($gs_, \@refs);
1029                                 if (scalar(@$linear_refs) !=
1030                                     scalar(@$linear_refs_)) {
1031                                         fatal "# of revisions changed ",
1032                                           "\nbefore:\n",
1033                                           join("\n", @$linear_refs),
1034                                           "\n\nafter:\n",
1035                                           join("\n", @$linear_refs_), "\n",
1036                                           'If you are attempting to commit ',
1037                                           "merges, try running:\n\t",
1038                                           'git rebase --interactive',
1039                                           '--preserve-merges ',
1040                                           $gs->refname,
1041                                           "\nBefore dcommitting";
1042                                 }
1043                                 if ($url_ ne $expect_url) {
1044                                         if ($url_ eq $gs->metadata_url) {
1045                                                 print
1046                                                   "Accepting rewritten URL:",
1047                                                   " $url_\n";
1048                                         } else {
1049                                                 fatal
1050                                                   "URL mismatch after rebase:",
1051                                                   " $url_ != $expect_url";
1052                                         }
1053                                 }
1054                                 if ($uuid_ ne $uuid) {
1055                                         fatal "uuid mismatch after rebase: ",
1056                                               "$uuid_ != $uuid";
1057                                 }
1058                                 # remap parents
1059                                 my (%p, @l, $i);
1060                                 for ($i = 0; $i < scalar @$linear_refs; $i++) {
1061                                         my $new = $linear_refs_->[$i] or next;
1062                                         $p{$new} =
1063                                                 $parents->{$linear_refs->[$i]};
1064                                         push @l, $new;
1065                                 }
1066                                 $parents = \%p;
1067                                 $linear_refs = \@l;
1068                                 undef $last_rev;
1069                         }
1070                 }
1071         }
1072
1073         if ($old_head) {
1074                 my $new_head = command_oneline(qw/rev-parse HEAD/);
1075                 my $new_is_symbolic = eval {
1076                         command_oneline(qw/symbolic-ref -q HEAD/);
1077                 };
1078                 if ($new_is_symbolic) {
1079                         print "dcommitted the branch ", $head, "\n";
1080                 } else {
1081                         print "dcommitted on a detached HEAD because you gave ",
1082                               "a revision argument.\n",
1083                               "The rewritten commit is: ", $new_head, "\n";
1084                 }
1085                 command(['checkout', $old_head], STDERR => 0);
1086         }
1087
1088         unlink $gs->{index};
1089 }
1090
1091 sub cmd_branch {
1092         my ($branch_name, $head) = @_;
1093
1094         unless (defined $branch_name && length $branch_name) {
1095                 die(($_tag ? "tag" : "branch") . " name required\n");
1096         }
1097         $head ||= 'HEAD';
1098
1099         my (undef, $rev, undef, $gs) = working_head_info($head);
1100         my $src = $gs->full_pushurl;
1101
1102         my $remote = Git::SVN::read_all_remotes()->{$gs->{repo_id}};
1103         my $allglobs = $remote->{ $_tag ? 'tags' : 'branches' };
1104         my $glob;
1105         if ($#{$allglobs} == 0) {
1106                 $glob = $allglobs->[0];
1107         } else {
1108                 unless(defined $_branch_dest) {
1109                         die "Multiple ",
1110                             $_tag ? "tag" : "branch",
1111                             " paths defined for Subversion repository.\n",
1112                             "You must specify where you want to create the ",
1113                             $_tag ? "tag" : "branch",
1114                             " with the --destination argument.\n";
1115                 }
1116                 foreach my $g (@{$allglobs}) {
1117                         my $re = Git::SVN::Editor::glob2pat($g->{path}->{left});
1118                         if ($_branch_dest =~ /$re/) {
1119                                 $glob = $g;
1120                                 last;
1121                         }
1122                 }
1123                 unless (defined $glob) {
1124                         my $dest_re = qr/\b\Q$_branch_dest\E\b/;
1125                         foreach my $g (@{$allglobs}) {
1126                                 $g->{path}->{left} =~ /$dest_re/ or next;
1127                                 if (defined $glob) {
1128                                         die "Ambiguous destination: ",
1129                                             $_branch_dest, "\nmatches both '",
1130                                             $glob->{path}->{left}, "' and '",
1131                                             $g->{path}->{left}, "'\n";
1132                                 }
1133                                 $glob = $g;
1134                         }
1135                         unless (defined $glob) {
1136                                 die "Unknown ",
1137                                     $_tag ? "tag" : "branch",
1138                                     " destination $_branch_dest\n";
1139                         }
1140                 }
1141         }
1142         my ($lft, $rgt) = @{ $glob->{path} }{qw/left right/};
1143         my $url;
1144         if (defined $_commit_url) {
1145                 $url = $_commit_url;
1146         } else {
1147                 $url = eval { command_oneline('config', '--get',
1148                         "svn-remote.$gs->{repo_id}.commiturl") };
1149                 if (!$url) {
1150                         $url = $remote->{pushurl} || $remote->{url};
1151                 }
1152         }
1153         my $dst = join '/', $url, $lft, $branch_name, ($rgt || ());
1154
1155         if ($dst =~ /^https:/ && $src =~ /^http:/) {
1156                 $src=~s/^http:/https:/;
1157         }
1158
1159         ::_req_svn();
1160
1161         my $ctx = SVN::Client->new(
1162                 auth    => Git::SVN::Ra::_auth_providers(),
1163                 log_msg => sub {
1164                         ${ $_[0] } = defined $_message
1165                                 ? $_message
1166                                 : 'Create ' . ($_tag ? 'tag ' : 'branch ' )
1167                                 . $branch_name;
1168                 },
1169         );
1170
1171         eval {
1172                 $ctx->ls($dst, 'HEAD', 0);
1173         } and die "branch ${branch_name} already exists\n";
1174
1175         print "Copying ${src} at r${rev} to ${dst}...\n";
1176         $ctx->copy($src, $rev, $dst)
1177                 unless $_dry_run;
1178
1179         $gs->fetch_all;
1180 }
1181
1182 sub cmd_find_rev {
1183         my $revision_or_hash = shift or die "SVN or git revision required ",
1184                                             "as a command-line argument\n";
1185         my $result;
1186         if ($revision_or_hash =~ /^r\d+$/) {
1187                 my $head = shift;
1188                 $head ||= 'HEAD';
1189                 my @refs;
1190                 my (undef, undef, $uuid, $gs) = working_head_info($head, \@refs);
1191                 unless ($gs) {
1192                         die "Unable to determine upstream SVN information from ",
1193                             "$head history\n";
1194                 }
1195                 my $desired_revision = substr($revision_or_hash, 1);
1196                 if ($_before) {
1197                         $result = $gs->find_rev_before($desired_revision, 1);
1198                 } elsif ($_after) {
1199                         $result = $gs->find_rev_after($desired_revision, 1);
1200                 } else {
1201                         $result = $gs->rev_map_get($desired_revision, $uuid);
1202                 }
1203         } else {
1204                 my (undef, $rev, undef) = cmt_metadata($revision_or_hash);
1205                 $result = $rev;
1206         }
1207         print "$result\n" if $result;
1208 }
1209
1210 sub auto_create_empty_directories {
1211         my ($gs) = @_;
1212         my $var = eval { command_oneline('config', '--get', '--bool',
1213                                          "svn-remote.$gs->{repo_id}.automkdirs") };
1214         # By default, create empty directories by consulting the unhandled log,
1215         # but allow setting it to 'false' to skip it.
1216         return !($var && $var eq 'false');
1217 }
1218
1219 sub cmd_rebase {
1220         command_noisy(qw/update-index --refresh/);
1221         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1222         unless ($gs) {
1223                 die "Unable to determine upstream SVN information from ",
1224                     "working tree history\n";
1225         }
1226         if ($_dry_run) {
1227                 print "Remote Branch: " . $gs->refname . "\n";
1228                 print "SVN URL: " . $url . "\n";
1229                 return;
1230         }
1231         if (command(qw/diff-index HEAD --/)) {
1232                 print STDERR "Cannot rebase with uncommited changes:\n";
1233                 command_noisy('status');
1234                 exit 1;
1235         }
1236         unless ($_local) {
1237                 # rebase will checkout for us, so no need to do it explicitly
1238                 $_no_checkout = 'true';
1239                 $_fetch_all ? $gs->fetch_all : $gs->fetch;
1240         }
1241         command_noisy(rebase_cmd(), $gs->refname);
1242         if (auto_create_empty_directories($gs)) {
1243                 $gs->mkemptydirs;
1244         }
1245 }
1246
1247 sub cmd_show_ignore {
1248         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1249         $gs ||= Git::SVN->new;
1250         my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
1251         $gs->prop_walk($gs->path, $r, sub {
1252                 my ($gs, $path, $props) = @_;
1253                 print STDOUT "\n# $path\n";
1254                 my $s = $props->{'svn:ignore'} or return;
1255                 $s =~ s/[\r\n]+/\n/g;
1256                 $s =~ s/^\n+//;
1257                 chomp $s;
1258                 $s =~ s#^#$path#gm;
1259                 print STDOUT "$s\n";
1260         });
1261 }
1262
1263 sub cmd_show_externals {
1264         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1265         $gs ||= Git::SVN->new;
1266         my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
1267         $gs->prop_walk($gs->path, $r, sub {
1268                 my ($gs, $path, $props) = @_;
1269                 print STDOUT "\n# $path\n";
1270                 my $s = $props->{'svn:externals'} or return;
1271                 $s =~ s/[\r\n]+/\n/g;
1272                 chomp $s;
1273                 $s =~ s#^#$path#gm;
1274                 print STDOUT "$s\n";
1275         });
1276 }
1277
1278 sub cmd_create_ignore {
1279         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1280         $gs ||= Git::SVN->new;
1281         my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
1282         $gs->prop_walk($gs->path, $r, sub {
1283                 my ($gs, $path, $props) = @_;
1284                 # $path is of the form /path/to/dir/
1285                 $path = '.' . $path;
1286                 # SVN can have attributes on empty directories,
1287                 # which git won't track
1288                 mkpath([$path]) unless -d $path;
1289                 my $ignore = $path . '.gitignore';
1290                 my $s = $props->{'svn:ignore'} or return;
1291                 open(GITIGNORE, '>', $ignore)
1292                   or fatal("Failed to open `$ignore' for writing: $!");
1293                 $s =~ s/[\r\n]+/\n/g;
1294                 $s =~ s/^\n+//;
1295                 chomp $s;
1296                 # Prefix all patterns so that the ignore doesn't apply
1297                 # to sub-directories.
1298                 $s =~ s#^#/#gm;
1299                 print GITIGNORE "$s\n";
1300                 close(GITIGNORE)
1301                   or fatal("Failed to close `$ignore': $!");
1302                 command_noisy('add', '-f', $ignore);
1303         });
1304 }
1305
1306 sub cmd_mkdirs {
1307         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1308         $gs ||= Git::SVN->new;
1309         $gs->mkemptydirs($_revision);
1310 }
1311
1312 # get_svnprops(PATH)
1313 # ------------------
1314 # Helper for cmd_propget and cmd_proplist below.
1315 sub get_svnprops {
1316         my $path = shift;
1317         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1318         $gs ||= Git::SVN->new;
1319
1320         # prefix THE PATH by the sub-directory from which the user
1321         # invoked us.
1322         $path = $cmd_dir_prefix . $path;
1323         fatal("No such file or directory: $path") unless -e $path;
1324         my $is_dir = -d $path ? 1 : 0;
1325         $path = join_paths($gs->path, $path);
1326
1327         # canonicalize the path (otherwise libsvn will abort or fail to
1328         # find the file)
1329         $path = canonicalize_path($path);
1330
1331         my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
1332         my $props;
1333         if ($is_dir) {
1334                 (undef, undef, $props) = $gs->ra->get_dir($path, $r);
1335         }
1336         else {
1337                 (undef, $props) = $gs->ra->get_file($path, $r, undef);
1338         }
1339         return $props;
1340 }
1341
1342 # cmd_propget (PROP, PATH)
1343 # ------------------------
1344 # Print the SVN property PROP for PATH.
1345 sub cmd_propget {
1346         my ($prop, $path) = @_;
1347         $path = '.' if not defined $path;
1348         usage(1) if not defined $prop;
1349         my $props = get_svnprops($path);
1350         if (not defined $props->{$prop}) {
1351                 fatal("`$path' does not have a `$prop' SVN property.");
1352         }
1353         print $props->{$prop} . "\n";
1354 }
1355
1356 # cmd_proplist (PATH)
1357 # -------------------
1358 # Print the list of SVN properties for PATH.
1359 sub cmd_proplist {
1360         my $path = shift;
1361         $path = '.' if not defined $path;
1362         my $props = get_svnprops($path);
1363         print "Properties on '$path':\n";
1364         foreach (sort keys %{$props}) {
1365                 print "  $_\n";
1366         }
1367 }
1368
1369 sub cmd_multi_init {
1370         my $url = shift;
1371         unless (defined $_trunk || @_branches || @_tags) {
1372                 usage(1);
1373         }
1374
1375         $_prefix = '' unless defined $_prefix;
1376         if (defined $url) {
1377                 $url = canonicalize_url($url);
1378                 init_subdir(@_);
1379         }
1380         do_git_init_db();
1381         if (defined $_trunk) {
1382                 $_trunk =~ s#^/+##;
1383                 my $trunk_ref = 'refs/remotes/' . $_prefix . 'trunk';
1384                 # try both old-style and new-style lookups:
1385                 my $gs_trunk = eval { Git::SVN->new($trunk_ref) };
1386                 unless ($gs_trunk) {
1387                         my ($trunk_url, $trunk_path) =
1388                                               complete_svn_url($url, $_trunk);
1389                         $gs_trunk = Git::SVN->init($trunk_url, $trunk_path,
1390                                                    undef, $trunk_ref);
1391                 }
1392         }
1393         return unless @_branches || @_tags;
1394         my $ra = $url ? Git::SVN::Ra->new($url) : undef;
1395         foreach my $path (@_branches) {
1396                 complete_url_ls_init($ra, $path, '--branches/-b', $_prefix);
1397         }
1398         foreach my $path (@_tags) {
1399                 complete_url_ls_init($ra, $path, '--tags/-t', $_prefix.'tags/');
1400         }
1401 }
1402
1403 sub cmd_multi_fetch {
1404         $Git::SVN::no_reuse_existing = undef;
1405         my $remotes = Git::SVN::read_all_remotes();
1406         foreach my $repo_id (sort keys %$remotes) {
1407                 if ($remotes->{$repo_id}->{url}) {
1408                         Git::SVN::fetch_all($repo_id, $remotes);
1409                 }
1410         }
1411 }
1412
1413 # this command is special because it requires no metadata
1414 sub cmd_commit_diff {
1415         my ($ta, $tb, $url) = @_;
1416         my $usage = "Usage: $0 commit-diff -r<revision> ".
1417                     "<tree-ish> <tree-ish> [<URL>]";
1418         fatal($usage) if (!defined $ta || !defined $tb);
1419         my $svn_path = '';
1420         if (!defined $url) {
1421                 my $gs = eval { Git::SVN->new };
1422                 if (!$gs) {
1423                         fatal("Needed URL or usable git-svn --id in ",
1424                               "the command-line\n", $usage);
1425                 }
1426                 $url = $gs->url;
1427                 $svn_path = $gs->path;
1428         }
1429         unless (defined $_revision) {
1430                 fatal("-r|--revision is a required argument\n", $usage);
1431         }
1432         if (defined $_message && defined $_file) {
1433                 fatal("Both --message/-m and --file/-F specified ",
1434                       "for the commit message.\n",
1435                       "I have no idea what you mean");
1436         }
1437         if (defined $_file) {
1438                 $_message = file_to_s($_file);
1439         } else {
1440                 $_message ||= get_commit_entry($tb)->{log};
1441         }
1442         my $ra ||= Git::SVN::Ra->new($url);
1443         my $r = $_revision;
1444         if ($r eq 'HEAD') {
1445                 $r = $ra->get_latest_revnum;
1446         } elsif ($r !~ /^\d+$/) {
1447                 die "revision argument: $r not understood by git-svn\n";
1448         }
1449         my %ed_opts = ( r => $r,
1450                         log => $_message,
1451                         ra => $ra,
1452                         tree_a => $ta,
1453                         tree_b => $tb,
1454                         editor_cb => sub { print "Committed r$_[0]\n" },
1455                         svn_path => $svn_path );
1456         if (!Git::SVN::Editor->new(\%ed_opts)->apply_diff) {
1457                 print "No changes\n$ta == $tb\n";
1458         }
1459 }
1460
1461
1462 sub cmd_info {
1463         my $path = canonicalize_path(defined($_[0]) ? $_[0] : ".");
1464         my $fullpath = canonicalize_path($cmd_dir_prefix . $path);
1465         if (exists $_[1]) {
1466                 die "Too many arguments specified\n";
1467         }
1468
1469         my ($file_type, $diff_status) = find_file_type_and_diff_status($path);
1470
1471         if (!$file_type && !$diff_status) {
1472                 print STDERR "svn: '$path' is not under version control\n";
1473                 exit 1;
1474         }
1475
1476         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1477         unless ($gs) {
1478                 die "Unable to determine upstream SVN information from ",
1479                     "working tree history\n";
1480         }
1481
1482         # canonicalize_path() will return "" to make libsvn 1.5.x happy,
1483         $path = "." if $path eq "";
1484
1485         my $full_url = canonicalize_url( add_path_to_url( $url, $fullpath ) );
1486
1487         if ($_url) {
1488                 print "$full_url\n";
1489                 return;
1490         }
1491
1492         my $result = "Path: $path\n";
1493         $result .= "Name: " . basename($path) . "\n" if $file_type ne "dir";
1494         $result .= "URL: $full_url\n";
1495
1496         eval {
1497                 my $repos_root = $gs->repos_root;
1498                 Git::SVN::remove_username($repos_root);
1499                 $result .= "Repository Root: " . canonicalize_url($repos_root) . "\n";
1500         };
1501         if ($@) {
1502                 $result .= "Repository Root: (offline)\n";
1503         }
1504         ::_req_svn();
1505         $result .= "Repository UUID: $uuid\n" unless $diff_status eq "A" &&
1506                 (::compare_svn_version('1.5.4') <= 0 || $file_type ne "dir");
1507         $result .= "Revision: " . ($diff_status eq "A" ? 0 : $rev) . "\n";
1508
1509         $result .= "Node Kind: " .
1510                    ($file_type eq "dir" ? "directory" : "file") . "\n";
1511
1512         my $schedule = $diff_status eq "A"
1513                        ? "add"
1514                        : ($diff_status eq "D" ? "delete" : "normal");
1515         $result .= "Schedule: $schedule\n";
1516
1517         if ($diff_status eq "A") {
1518                 print $result, "\n";
1519                 return;
1520         }
1521
1522         my ($lc_author, $lc_rev, $lc_date_utc);
1523         my @args = Git::SVN::Log::git_svn_log_cmd($rev, $rev, "--", $fullpath);
1524         my $log = command_output_pipe(@args);
1525         my $esc_color = qr/(?:\033\[(?:(?:\d+;)*\d*)?m)*/;
1526         while (<$log>) {
1527                 if (/^${esc_color}author (.+) <[^>]+> (\d+) ([\-\+]?\d+)$/o) {
1528                         $lc_author = $1;
1529                         $lc_date_utc = Git::SVN::Log::parse_git_date($2, $3);
1530                 } elsif (/^${esc_color}    (git-svn-id:.+)$/o) {
1531                         (undef, $lc_rev, undef) = ::extract_metadata($1);
1532                 }
1533         }
1534         close $log;
1535
1536         Git::SVN::Log::set_local_timezone();
1537
1538         $result .= "Last Changed Author: $lc_author\n";
1539         $result .= "Last Changed Rev: $lc_rev\n";
1540         $result .= "Last Changed Date: " .
1541                    Git::SVN::Log::format_svn_date($lc_date_utc) . "\n";
1542
1543         if ($file_type ne "dir") {
1544                 my $text_last_updated_date =
1545                     ($diff_status eq "D" ? $lc_date_utc : (stat $path)[9]);
1546                 $result .=
1547                     "Text Last Updated: " .
1548                     Git::SVN::Log::format_svn_date($text_last_updated_date) .
1549                     "\n";
1550                 my $checksum;
1551                 if ($diff_status eq "D") {
1552                         my ($fh, $ctx) =
1553                             command_output_pipe(qw(cat-file blob), "HEAD:$path");
1554                         if ($file_type eq "link") {
1555                                 my $file_name = <$fh>;
1556                                 $checksum = md5sum("link $file_name");
1557                         } else {
1558                                 $checksum = md5sum($fh);
1559                         }
1560                         command_close_pipe($fh, $ctx);
1561                 } elsif ($file_type eq "link") {
1562                         my $file_name =
1563                             command(qw(cat-file blob), "HEAD:$path");
1564                         $checksum =
1565                             md5sum("link " . $file_name);
1566                 } else {
1567                         open FILE, "<", $path or die $!;
1568                         $checksum = md5sum(\*FILE);
1569                         close FILE or die $!;
1570                 }
1571                 $result .= "Checksum: " . $checksum . "\n";
1572         }
1573
1574         print $result, "\n";
1575 }
1576
1577 sub cmd_reset {
1578         my $target = shift || $_revision or die "SVN revision required\n";
1579         $target = $1 if $target =~ /^r(\d+)$/;
1580         $target =~ /^\d+$/ or die "Numeric SVN revision expected\n";
1581         my ($url, $rev, $uuid, $gs) = working_head_info('HEAD');
1582         unless ($gs) {
1583                 die "Unable to determine upstream SVN information from ".
1584                     "history\n";
1585         }
1586         my ($r, $c) = $gs->find_rev_before($target, not $_fetch_parent);
1587         die "Cannot find SVN revision $target\n" unless defined($c);
1588         $gs->rev_map_set($r, $c, 'reset', $uuid);
1589         print "r$r = $c ($gs->{ref_id})\n";
1590 }
1591
1592 sub cmd_gc {
1593         if (!can_compress()) {
1594                 warn "Compress::Zlib could not be found; unhandled.log " .
1595                      "files will not be compressed.\n";
1596         }
1597         find({ wanted => \&gc_directory, no_chdir => 1}, "$ENV{GIT_DIR}/svn");
1598 }
1599
1600 ########################### utility functions #########################
1601
1602 sub rebase_cmd {
1603         my @cmd = qw/rebase/;
1604         push @cmd, '-v' if $_verbose;
1605         push @cmd, qw/--merge/ if $_merge;
1606         push @cmd, "--strategy=$_strategy" if $_strategy;
1607         push @cmd, "--preserve-merges" if $_preserve_merges;
1608         @cmd;
1609 }
1610
1611 sub post_fetch_checkout {
1612         return if $_no_checkout;
1613         return if verify_ref('HEAD^0');
1614         my $gs = $Git::SVN::_head or return;
1615
1616         # look for "trunk" ref if it exists
1617         my $remote = Git::SVN::read_all_remotes()->{$gs->{repo_id}};
1618         my $fetch = $remote->{fetch};
1619         if ($fetch) {
1620                 foreach my $p (keys %$fetch) {
1621                         basename($fetch->{$p}) eq 'trunk' or next;
1622                         $gs = Git::SVN->new($fetch->{$p}, $gs->{repo_id}, $p);
1623                         last;
1624                 }
1625         }
1626
1627         command_noisy(qw(update-ref HEAD), $gs->refname);
1628         return unless verify_ref('HEAD^0');
1629
1630         return if $ENV{GIT_DIR} !~ m#^(?:.*/)?\.git$#;
1631         my $index = $ENV{GIT_INDEX_FILE} || "$ENV{GIT_DIR}/index";
1632         return if -f $index;
1633
1634         return if command_oneline(qw/rev-parse --is-inside-work-tree/) eq 'false';
1635         return if command_oneline(qw/rev-parse --is-inside-git-dir/) eq 'true';
1636         command_noisy(qw/read-tree -m -u -v HEAD HEAD/);
1637         print STDERR "Checked out HEAD:\n  ",
1638                      $gs->full_url, " r", $gs->last_rev, "\n";
1639         if (auto_create_empty_directories($gs)) {
1640                 $gs->mkemptydirs($gs->last_rev);
1641         }
1642 }
1643
1644 sub complete_svn_url {
1645         my ($url, $path) = @_;
1646         $path = canonicalize_path($path);
1647
1648         # If the path is not a URL...
1649         if ($path !~ m#^[a-z\+]+://#) {
1650                 if (!defined $url || $url !~ m#^[a-z\+]+://#) {
1651                         fatal("E: '$path' is not a complete URL ",
1652                               "and a separate URL is not specified");
1653                 }
1654                 return ($url, $path);
1655         }
1656         return ($path, '');
1657 }
1658
1659 sub complete_url_ls_init {
1660         my ($ra, $repo_path, $switch, $pfx) = @_;
1661         unless ($repo_path) {
1662                 print STDERR "W: $switch not specified\n";
1663                 return;
1664         }
1665         $repo_path = canonicalize_path($repo_path);
1666         if ($repo_path =~ m#^[a-z\+]+://#) {
1667                 $ra = Git::SVN::Ra->new($repo_path);
1668                 $repo_path = '';
1669         } else {
1670                 $repo_path =~ s#^/+##;
1671                 unless ($ra) {
1672                         fatal("E: '$repo_path' is not a complete URL ",
1673                               "and a separate URL is not specified");
1674                 }
1675         }
1676         my $url = $ra->url;
1677         my $gs = Git::SVN->init($url, undef, undef, undef, 1);
1678         my $k = "svn-remote.$gs->{repo_id}.url";
1679         my $orig_url = eval { command_oneline(qw/config --get/, $k) };
1680         if ($orig_url && ($orig_url ne $gs->url)) {
1681                 die "$k already set: $orig_url\n",
1682                     "wanted to set to: $gs->url\n";
1683         }
1684         command_oneline('config', $k, $gs->url) unless $orig_url;
1685
1686         my $remote_path = join_paths( $gs->path, $repo_path );
1687         $remote_path =~ s{%([0-9A-F]{2})}{chr hex($1)}ieg;
1688         $remote_path =~ s#^/##g;
1689         $remote_path .= "/*" if $remote_path !~ /\*/;
1690         my ($n) = ($switch =~ /^--(\w+)/);
1691         if (length $pfx && $pfx !~ m#/$#) {
1692                 die "--prefix='$pfx' must have a trailing slash '/'\n";
1693         }
1694         command_noisy('config',
1695                       '--add',
1696                       "svn-remote.$gs->{repo_id}.$n",
1697                       "$remote_path:refs/remotes/$pfx*" .
1698                         ('/*' x (($remote_path =~ tr/*/*/) - 1)) );
1699 }
1700
1701 sub verify_ref {
1702         my ($ref) = @_;
1703         eval { command_oneline([ 'rev-parse', '--verify', $ref ],
1704                                { STDERR => 0 }); };
1705 }
1706
1707 sub get_tree_from_treeish {
1708         my ($treeish) = @_;
1709         # $treeish can be a symbolic ref, too:
1710         my $type = command_oneline(qw/cat-file -t/, $treeish);
1711         my $expected;
1712         while ($type eq 'tag') {
1713                 ($treeish, $type) = command(qw/cat-file tag/, $treeish);
1714         }
1715         if ($type eq 'commit') {
1716                 $expected = (grep /^tree /, command(qw/cat-file commit/,
1717                                                     $treeish))[0];
1718                 ($expected) = ($expected =~ /^tree ($sha1)$/o);
1719                 die "Unable to get tree from $treeish\n" unless $expected;
1720         } elsif ($type eq 'tree') {
1721                 $expected = $treeish;
1722         } else {
1723                 die "$treeish is a $type, expected tree, tag or commit\n";
1724         }
1725         return $expected;
1726 }
1727
1728 sub get_commit_entry {
1729         my ($treeish) = shift;
1730         my %log_entry = ( log => '', tree => get_tree_from_treeish($treeish) );
1731         my $commit_editmsg = "$ENV{GIT_DIR}/COMMIT_EDITMSG";
1732         my $commit_msg = "$ENV{GIT_DIR}/COMMIT_MSG";
1733         open my $log_fh, '>', $commit_editmsg or croak $!;
1734
1735         my $type = command_oneline(qw/cat-file -t/, $treeish);
1736         if ($type eq 'commit' || $type eq 'tag') {
1737                 my ($msg_fh, $ctx) = command_output_pipe('cat-file',
1738                                                          $type, $treeish);
1739                 my $in_msg = 0;
1740                 my $author;
1741                 my $saw_from = 0;
1742                 my $msgbuf = "";
1743                 while (<$msg_fh>) {
1744                         if (!$in_msg) {
1745                                 $in_msg = 1 if (/^\s*$/);
1746                                 $author = $1 if (/^author (.*>)/);
1747                         } elsif (/^git-svn-id: /) {
1748                                 # skip this for now, we regenerate the
1749                                 # correct one on re-fetch anyways
1750                                 # TODO: set *:merge properties or like...
1751                         } else {
1752                                 if (/^From:/ || /^Signed-off-by:/) {
1753                                         $saw_from = 1;
1754                                 }
1755                                 $msgbuf .= $_;
1756                         }
1757                 }
1758                 $msgbuf =~ s/\s+$//s;
1759                 if ($Git::SVN::_add_author_from && defined($author)
1760                     && !$saw_from) {
1761                         $msgbuf .= "\n\nFrom: $author";
1762                 }
1763                 print $log_fh $msgbuf or croak $!;
1764                 command_close_pipe($msg_fh, $ctx);
1765         }
1766         close $log_fh or croak $!;
1767
1768         if ($_edit || ($type eq 'tree')) {
1769                 chomp(my $editor = command_oneline(qw(var GIT_EDITOR)));
1770                 system('sh', '-c', $editor.' "$@"', $editor, $commit_editmsg);
1771         }
1772         rename $commit_editmsg, $commit_msg or croak $!;
1773         {
1774                 require Encode;
1775                 # SVN requires messages to be UTF-8 when entering the repo
1776                 local $/;
1777                 open $log_fh, '<', $commit_msg or croak $!;
1778                 binmode $log_fh;
1779                 chomp($log_entry{log} = <$log_fh>);
1780
1781                 my $enc = Git::config('i18n.commitencoding') || 'UTF-8';
1782                 my $msg = $log_entry{log};
1783
1784                 eval { $msg = Encode::decode($enc, $msg, 1) };
1785                 if ($@) {
1786                         die "Could not decode as $enc:\n", $msg,
1787                             "\nPerhaps you need to set i18n.commitencoding\n";
1788                 }
1789
1790                 eval { $msg = Encode::encode('UTF-8', $msg, 1) };
1791                 die "Could not encode as UTF-8:\n$msg\n" if $@;
1792
1793                 $log_entry{log} = $msg;
1794
1795                 close $log_fh or croak $!;
1796         }
1797         unlink $commit_msg;
1798         \%log_entry;
1799 }
1800
1801 sub s_to_file {
1802         my ($str, $file, $mode) = @_;
1803         open my $fd,'>',$file or croak $!;
1804         print $fd $str,"\n" or croak $!;
1805         close $fd or croak $!;
1806         chmod ($mode &~ umask, $file) if (defined $mode);
1807 }
1808
1809 sub file_to_s {
1810         my $file = shift;
1811         open my $fd,'<',$file or croak "$!: file: $file\n";
1812         local $/;
1813         my $ret = <$fd>;
1814         close $fd or croak $!;
1815         $ret =~ s/\s*$//s;
1816         return $ret;
1817 }
1818
1819 # '<svn username> = real-name <email address>' mapping based on git-svnimport:
1820 sub load_authors {
1821         open my $authors, '<', $_authors or die "Can't open $_authors $!\n";
1822         my $log = $cmd eq 'log';
1823         while (<$authors>) {
1824                 chomp;
1825                 next unless /^(.+?|\(no author\))\s*=\s*(.+?)\s*<(.+)>\s*$/;
1826                 my ($user, $name, $email) = ($1, $2, $3);
1827                 if ($log) {
1828                         $Git::SVN::Log::rusers{"$name <$email>"} = $user;
1829                 } else {
1830                         $users{$user} = [$name, $email];
1831                 }
1832         }
1833         close $authors or croak $!;
1834 }
1835
1836 # convert GetOpt::Long specs for use by git-config
1837 sub read_git_config {
1838         my $opts = shift;
1839         my @config_only;
1840         foreach my $o (keys %$opts) {
1841                 # if we have mixedCase and a long option-only, then
1842                 # it's a config-only variable that we don't need for
1843                 # the command-line.
1844                 push @config_only, $o if ($o =~ /[A-Z]/ && $o =~ /^[a-z]+$/i);
1845                 my $v = $opts->{$o};
1846                 my ($key) = ($o =~ /^([a-zA-Z\-]+)/);
1847                 $key =~ s/-//g;
1848                 my $arg = 'git config';
1849                 $arg .= ' --int' if ($o =~ /[:=]i$/);
1850                 $arg .= ' --bool' if ($o !~ /[:=][sfi]$/);
1851                 if (ref $v eq 'ARRAY') {
1852                         chomp(my @tmp = `$arg --get-all svn.$key`);
1853                         @$v = @tmp if @tmp;
1854                 } else {
1855                         chomp(my $tmp = `$arg --get svn.$key`);
1856                         if ($tmp && !($arg =~ / --bool/ && $tmp eq 'false')) {
1857                                 $$v = $tmp;
1858                         }
1859                 }
1860         }
1861         delete @$opts{@config_only} if @config_only;
1862 }
1863
1864 sub extract_metadata {
1865         my $id = shift or return (undef, undef, undef);
1866         my ($url, $rev, $uuid) = ($id =~ /^\s*git-svn-id:\s+(.*)\@(\d+)
1867                                                         \s([a-f\d\-]+)$/ix);
1868         if (!defined $rev || !$uuid || !$url) {
1869                 # some of the original repositories I made had
1870                 # identifiers like this:
1871                 ($rev, $uuid) = ($id =~/^\s*git-svn-id:\s(\d+)\@([a-f\d\-]+)/i);
1872         }
1873         return ($url, $rev, $uuid);
1874 }
1875
1876 sub cmt_metadata {
1877         return extract_metadata((grep(/^git-svn-id: /,
1878                 command(qw/cat-file commit/, shift)))[-1]);
1879 }
1880
1881 sub cmt_sha2rev_batch {
1882         my %s2r;
1883         my ($pid, $in, $out, $ctx) = command_bidi_pipe(qw/cat-file --batch/);
1884         my $list = shift;
1885
1886         foreach my $sha (@{$list}) {
1887                 my $first = 1;
1888                 my $size = 0;
1889                 print $out $sha, "\n";
1890
1891                 while (my $line = <$in>) {
1892                         if ($first && $line =~ /^[[:xdigit:]]{40}\smissing$/) {
1893                                 last;
1894                         } elsif ($first &&
1895                                $line =~ /^[[:xdigit:]]{40}\scommit\s(\d+)$/) {
1896                                 $first = 0;
1897                                 $size = $1;
1898                                 next;
1899                         } elsif ($line =~ /^(git-svn-id: )/) {
1900                                 my (undef, $rev, undef) =
1901                                                       extract_metadata($line);
1902                                 $s2r{$sha} = $rev;
1903                         }
1904
1905                         $size -= length($line);
1906                         last if ($size == 0);
1907                 }
1908         }
1909
1910         command_close_bidi_pipe($pid, $in, $out, $ctx);
1911
1912         return \%s2r;
1913 }
1914
1915 sub working_head_info {
1916         my ($head, $refs) = @_;
1917         my @args = qw/rev-list --first-parent --pretty=medium/;
1918         my ($fh, $ctx) = command_output_pipe(@args, $head);
1919         my $hash;
1920         my %max;
1921         while (<$fh>) {
1922                 if ( m{^commit ($::sha1)$} ) {
1923                         unshift @$refs, $hash if $hash and $refs;
1924                         $hash = $1;
1925                         next;
1926                 }
1927                 next unless s{^\s*(git-svn-id:)}{$1};
1928                 my ($url, $rev, $uuid) = extract_metadata($_);
1929                 if (defined $url && defined $rev) {
1930                         next if $max{$url} and $max{$url} < $rev;
1931                         if (my $gs = Git::SVN->find_by_url($url)) {
1932                                 my $c = $gs->rev_map_get($rev, $uuid);
1933                                 if ($c && $c eq $hash) {
1934                                         close $fh; # break the pipe
1935                                         return ($url, $rev, $uuid, $gs);
1936                                 } else {
1937                                         $max{$url} ||= $gs->rev_map_max;
1938                                 }
1939                         }
1940                 }
1941         }
1942         command_close_pipe($fh, $ctx);
1943         (undef, undef, undef, undef);
1944 }
1945
1946 sub read_commit_parents {
1947         my ($parents, $c) = @_;
1948         chomp(my $p = command_oneline(qw/rev-list --parents -1/, $c));
1949         $p =~ s/^($c)\s*// or die "rev-list --parents -1 $c failed!\n";
1950         @{$parents->{$c}} = split(/ /, $p);
1951 }
1952
1953 sub linearize_history {
1954         my ($gs, $refs) = @_;
1955         my %parents;
1956         foreach my $c (@$refs) {
1957                 read_commit_parents(\%parents, $c);
1958         }
1959
1960         my @linear_refs;
1961         my %skip = ();
1962         my $last_svn_commit = $gs->last_commit;
1963         foreach my $c (reverse @$refs) {
1964                 next if $c eq $last_svn_commit;
1965                 last if $skip{$c};
1966
1967                 unshift @linear_refs, $c;
1968                 $skip{$c} = 1;
1969
1970                 # we only want the first parent to diff against for linear
1971                 # history, we save the rest to inject when we finalize the
1972                 # svn commit
1973                 my $fp_a = verify_ref("$c~1");
1974                 my $fp_b = shift @{$parents{$c}} if $parents{$c};
1975                 if (!$fp_a || !$fp_b) {
1976                         die "Commit $c\n",
1977                             "has no parent commit, and therefore ",
1978                             "nothing to diff against.\n",
1979                             "You should be working from a repository ",
1980                             "originally created by git-svn\n";
1981                 }
1982                 if ($fp_a ne $fp_b) {
1983                         die "$c~1 = $fp_a, however parsing commit $c ",
1984                             "revealed that:\n$c~1 = $fp_b\nBUG!\n";
1985                 }
1986
1987                 foreach my $p (@{$parents{$c}}) {
1988                         $skip{$p} = 1;
1989                 }
1990         }
1991         (\@linear_refs, \%parents);
1992 }
1993
1994 sub find_file_type_and_diff_status {
1995         my ($path) = @_;
1996         return ('dir', '') if $path eq '';
1997
1998         my $diff_output =
1999             command_oneline(qw(diff --cached --name-status --), $path) || "";
2000         my $diff_status = (split(' ', $diff_output))[0] || "";
2001
2002         my $ls_tree = command_oneline(qw(ls-tree HEAD), $path) || "";
2003
2004         return (undef, undef) if !$diff_status && !$ls_tree;
2005
2006         if ($diff_status eq "A") {
2007                 return ("link", $diff_status) if -l $path;
2008                 return ("dir", $diff_status) if -d $path;
2009                 return ("file", $diff_status);
2010         }
2011
2012         my $mode = (split(' ', $ls_tree))[0] || "";
2013
2014         return ("link", $diff_status) if $mode eq "120000";
2015         return ("dir", $diff_status) if $mode eq "040000";
2016         return ("file", $diff_status);
2017 }
2018
2019 sub md5sum {
2020         my $arg = shift;
2021         my $ref = ref $arg;
2022         my $md5 = Digest::MD5->new();
2023         if ($ref eq 'GLOB' || $ref eq 'IO::File' || $ref eq 'File::Temp') {
2024                 $md5->addfile($arg) or croak $!;
2025         } elsif ($ref eq 'SCALAR') {
2026                 $md5->add($$arg) or croak $!;
2027         } elsif (!$ref) {
2028                 $md5->add($arg) or croak $!;
2029         } else {
2030                 fatal "Can't provide MD5 hash for unknown ref type: '", $ref, "'";
2031         }
2032         return $md5->hexdigest();
2033 }
2034
2035 sub gc_directory {
2036         if (can_compress() && -f $_ && basename($_) eq "unhandled.log") {
2037                 my $out_filename = $_ . ".gz";
2038                 open my $in_fh, "<", $_ or die "Unable to open $_: $!\n";
2039                 binmode $in_fh;
2040                 my $gz = Compress::Zlib::gzopen($out_filename, "ab") or
2041                                 die "Unable to open $out_filename: $!\n";
2042
2043                 my $res;
2044                 while ($res = sysread($in_fh, my $str, 1024)) {
2045                         $gz->gzwrite($str) or
2046                                 die "Unable to write: ".$gz->gzerror()."!\n";
2047                 }
2048                 unlink $_ or die "unlink $File::Find::name: $!\n";
2049         } elsif (-f $_ && basename($_) eq "index") {
2050                 unlink $_ or die "unlink $_: $!\n";
2051         }
2052 }
2053
2054 __END__
2055
2056 Data structures:
2057
2058
2059 $remotes = { # returned by read_all_remotes()
2060         'svn' => {
2061                 # svn-remote.svn.url=https://svn.musicpd.org
2062                 url => 'https://svn.musicpd.org',
2063                 # svn-remote.svn.fetch=mpd/trunk:trunk
2064                 fetch => {
2065                         'mpd/trunk' => 'trunk',
2066                 },
2067                 # svn-remote.svn.tags=mpd/tags/*:tags/*
2068                 tags => {
2069                         path => {
2070                                 left => 'mpd/tags',
2071                                 right => '',
2072                                 regex => qr!mpd/tags/([^/]+)$!,
2073                                 glob => 'tags/*',
2074                         },
2075                         ref => {
2076                                 left => 'tags',
2077                                 right => '',
2078                                 regex => qr!tags/([^/]+)$!,
2079                                 glob => 'tags/*',
2080                         },
2081                 }
2082         }
2083 };
2084
2085 $log_entry hashref as returned by libsvn_log_entry()
2086 {
2087         log => 'whitespace-formatted log entry
2088 ',                                              # trailing newline is preserved
2089         revision => '8',                        # integer
2090         date => '2004-02-24T17:01:44.108345Z',  # commit date
2091         author => 'committer name'
2092 };
2093
2094
2095 # this is generated by generate_diff();
2096 @mods = array of diff-index line hashes, each element represents one line
2097         of diff-index output
2098
2099 diff-index line ($m hash)
2100 {
2101         mode_a => first column of diff-index output, no leading ':',
2102         mode_b => second column of diff-index output,
2103         sha1_b => sha1sum of the final blob,
2104         chg => change type [MCRADT],
2105         file_a => original file name of a file (iff chg is 'C' or 'R')
2106         file_b => new/current file name of a file (any chg)
2107 }
2108 ;
2109
2110 # retval of read_url_paths{,_all}();
2111 $l_map = {
2112         # repository root url
2113         'https://svn.musicpd.org' => {
2114                 # repository path               # GIT_SVN_ID
2115                 'mpd/trunk'             =>      'trunk',
2116                 'mpd/tags/0.11.5'       =>      'tags/0.11.5',
2117         },
2118 }
2119
2120 Notes:
2121         I don't trust the each() function on unless I created %hash myself
2122         because the internal iterator may not have started at base.