git-archimport.perl

   1 #!/usr/bin/perl -w
   2 #
   3 # This tool is copyright (c) 2005, Martin Langhoff.
   4 # It is released under the Gnu Public License, version 2.
   5 #
   6 # The basic idea is to walk the output of tla abrowse,
   7 # fetch the changesets and apply them.
   8 #
   9
  10 =head1 Invocation
  11
  12     git-archimport [ -h ] [ -v ] [ -o ] [ -a ] [ -f ] [ -T ]
  13         [ -D depth] [ -t tempdir ] <archive>/<branch> [ <archive>/<branch> ]
  14
  15 Imports a project from one or more Arch repositories. It will follow branches
  16 and repositories within the namespaces defined by the <archive/branch>
  17 parameters supplied. If it cannot find the remote branch a merge comes from
  18 it will just import it as a regular commit. If it can find it, it will mark it
  19 as a merge whenever possible.
  20
  21 See man (1) git-archimport for more details.
  22
  23 =head1 TODO
  24
  25  - create tag objects instead of ref tags
  26  - audit shell-escaping of filenames
  27  - hide our private tags somewhere smarter
  28  - find a way to make "cat *patches | patch" safe even when patchfiles are missing newlines
  29  - sort and apply patches by graphing ancestry relations instead of just
  30    relying in dates supplied in the changeset itself.
  31    tla ancestry-graph -m could be helpful here...
  32
  33 =head1 Devel tricks
  34
  35 Add print in front of the shell commands invoked via backticks.
  36
  37 =head1 Devel Notes
  38
  39 There are several places where Arch and git terminology are intermixed
  40 and potentially confused.
  41
  42 The notion of a "branch" in git is approximately equivalent to
  43 a "archive/category--branch--version" in Arch.  Also, it should be noted
  44 that the "--branch" portion of "archive/category--branch--version" is really
  45 optional in Arch although not many people (nor tools!) seem to know this.
  46 This means that "archive/category--version" is also a valid "branch"
  47 in git terms.
  48
  49 We always refer to Arch names by their fully qualified variant (which
  50 means the "archive" name is prefixed.
  51
  52 For people unfamiliar with Arch, an "archive" is the term for "repository",
  53 and can contain multiple, unrelated branches.
  54
  55 =cut
  56
  57 use strict;
  58 use warnings;
  59 use Getopt::Std;
  60 use File::Temp qw(tempdir);
  61 use File::Path qw(mkpath rmtree);
  62 use File::Basename qw(basename dirname);
  63 use Data::Dumper qw/ Dumper /;
  64 use IPC::Open2;
  65
  66 $SIG{'PIPE'}="IGNORE";
  67 $ENV{'TZ'}="UTC";
  68
  69 my $git_dir = $ENV{"GIT_DIR"} || ".git";
  70 $ENV{"GIT_DIR"} = $git_dir;
  71 my $ptag_dir = "$git_dir/archimport/tags";
  72
  73 our($opt_h,$opt_f,$opt_v,$opt_T,$opt_t,$opt_D,$opt_a,$opt_o);
  74
  75 sub usage() {
  76     print STDERR <<END;
  77 Usage: ${\basename $0}     # fetch/update GIT from Arch
  78        [ -h ] [ -v ] [ -o ] [ -a ] [ -f ] [ -T ] [ -D depth ] [ -t tempdir ]
  79        repository/arch-branch [ repository/arch-branch] ...
  80 END
  81     exit(1);
  82 }
  83
  84 getopts("fThvat:D:") or usage();
  85 usage if $opt_h;
  86
  87 @ARGV >= 1 or usage();
  88 # $arch_branches:
  89 # values associated with keys:
  90 #   =1 - Arch version / git 'branch' detected via abrowse on a limit
  91 #   >1 - Arch version / git 'branch' of an auxiliary branch we've merged
  92 my %arch_branches = map { my $branch = $_; $branch =~ s/:[^:]*$//; $branch => 1 } @ARGV;
  93
  94 # $branch_name_map:
  95 # maps arch branches to git branch names
  96 my %branch_name_map = map { m/^(.*):([^:]*)$/; $1 => $2 } grep { m/:/ } @ARGV;
  97
  98 $ENV{'TMPDIR'} = $opt_t if $opt_t; # $ENV{TMPDIR} will affect tempdir() calls:
  99 my $tmp = tempdir('git-archimport-XXXXXX', TMPDIR => 1, CLEANUP => 1);
 100 $opt_v && print "+ Using $tmp as temporary directory\n";
 101
 102 unless (-d $git_dir) { # initial import needs empty directory
 103     opendir DIR, '.' or die "Unable to open current directory: $!\n";
 104     while (my $entry = readdir DIR) {
 105         $entry =~ /^\.\.?$/ or
 106             die "Initial import needs an empty current working directory.\n"
 107     }
 108     closedir DIR
 109 }
 110
 111 my $default_archive;            # default Arch archive
 112 my %reachable = ();             # Arch repositories we can access
 113 my %unreachable = ();           # Arch repositories we can't access :<
 114 my @psets  = ();                # the collection
 115 my %psets  = ();                # the collection, by name
 116 my %stats  = (                  # Track which strategy we used to import:
 117         get_tag => 0, replay => 0, get_new => 0, get_delta => 0,
 118         simple_changeset => 0, import_or_tag => 0
 119 );
 120
 121 my %rptags = ();                # my reverse private tags
 122                                 # to map a SHA1 to a commitid
 123 my $TLA = $ENV{'ARCH_CLIENT'} || 'tla';
 124
 125 sub do_abrowse {
 126     my $stage = shift;
 127     while (my ($limit, $level) = each %arch_branches) {
 128         next unless $level == $stage;
 129
 130         open ABROWSE, "$TLA abrowse -fkD --merges $limit |"
 131                                 or die "Problems with tla abrowse: $!";
 132
 133         my %ps        = ();         # the current one
 134         my $lastseen  = '';
 135
 136         while (<ABROWSE>) {
 137             chomp;
 138
 139             # first record padded w 8 spaces
 140             if (s/^\s{8}\b//) {
 141                 my ($id, $type) = split(m/\s+/, $_, 2);
 142
 143                 my %last_ps;
 144                 # store the record we just captured
 145                 if (%ps && !exists $psets{ $ps{id} }) {
 146                     %last_ps = %ps; # break references
 147                     push (@psets, \%last_ps);
 148                     $psets{ $last_ps{id} } = \%last_ps;
 149                 }
 150
 151                 my $branch = extract_versionname($id);
 152                 %ps = ( id => $id, branch => $branch );
 153                 if (%last_ps && ($last_ps{branch} eq $branch)) {
 154                     $ps{parent_id} = $last_ps{id};
 155                 }
 156
 157                 $arch_branches{$branch} = 1;
 158                 $lastseen = 'id';
 159
 160                 # deal with types (should work with baz or tla):
 161                 if ($type =~ m/\(.*changeset\)/) {
 162                     $ps{type} = 's';
 163                 } elsif ($type =~ /\(.*import\)/) {
 164                     $ps{type} = 'i';
 165                 } elsif ($type =~ m/\(tag.*?(\S+\@\S+).*?\)/) {
 166                     $ps{type} = 't';
 167                     # read which revision we've tagged when we parse the log
 168                     $ps{tag}  = $1;
 169                 } else {
 170                     warn "Unknown type $type";
 171                 }
 172
 173                 $arch_branches{$branch} = 1;
 174                 $lastseen = 'id';
 175             } elsif (s/^\s{10}//) {
 176                 # 10 leading spaces or more
 177                 # indicate commit metadata
 178
 179                 # date
 180                 if ($lastseen eq 'id' && m/^(\d{4}-\d\d-\d\d \d\d:\d\d:\d\d)/){
 181                     $ps{date}   = $1;
 182                     $lastseen = 'date';
 183                 } elsif ($_ eq 'merges in:') {
 184                     $ps{merges} = [];
 185                     $lastseen = 'merges';
 186                 } elsif ($lastseen eq 'merges' && s/^\s{2}//) {
 187                     my $id = $_;
 188                     push (@{$ps{merges}}, $id);
 189
 190                     # aggressive branch finding:
 191                     if ($opt_D) {
 192                         my $branch = extract_versionname($id);
 193                         my $repo = extract_reponame($branch);
 194
 195                         if (archive_reachable($repo) &&
 196                                 !defined $arch_branches{$branch}) {
 197                             $arch_branches{$branch} = $stage + 1;
 198                         }
 199                     }
 200                 } else {
 201                     warn "more metadata after merges!?: $_\n" unless /^\s*$/;
 202                 }
 203             }
 204         }
 205
 206         if (%ps && !exists $psets{ $ps{id} }) {
 207             my %temp = %ps;         # break references
 208             if (@psets && $psets[$#psets]{branch} eq $ps{branch}) {
 209                 $temp{parent_id} = $psets[$#psets]{id};
 210             }
 211             push (@psets, \%temp);
 212             $psets{ $temp{id} } = \%temp;
 213         }
 214
 215         close ABROWSE or die "$TLA abrowse failed on $limit\n";
 216     }
 217 }                               # end foreach $root
 218
 219 do_abrowse(1);
 220 my $depth = 2;
 221 $opt_D ||= 0;
 222 while ($depth <= $opt_D) {
 223     do_abrowse($depth);
 224     $depth++;
 225 }
 226
 227 ## Order patches by time
 228 # FIXME see if we can find a more optimal way to do this by graphing
 229 # the ancestry data and walking it, that way we won't have to rely on
 230 # client-supplied dates
 231 @psets = sort {$a->{date}.$b->{id} cmp $b->{date}.$b->{id}} @psets;
 232
 233 #print Dumper \@psets;
 234
 235 ##
 236 ## TODO cleanup irrelevant patches
 237 ##      and put an initial import
 238 ##      or a full tag
 239 my $import = 0;
 240 unless (-d $git_dir) { # initial import
 241     if ($psets[0]{type} eq 'i' || $psets[0]{type} eq 't') {
 242         print "Starting import from $psets[0]{id}\n";
 243         `git-init`;
 244         die $! if $?;
 245         $import = 1;
 246     } else {
 247         die "Need to start from an import or a tag -- cannot use $psets[0]{id}";
 248     }
 249 } else {    # progressing an import
 250     # load the rptags
 251     opendir(DIR, $ptag_dir)
 252         || die "can't opendir: $!";
 253     while (my $file = readdir(DIR)) {
 254         # skip non-interesting-files
 255         next unless -f "$ptag_dir/$file";
 256
 257         # convert first '--' to '/' from old git-archimport to use
 258         # as an archivename/c--b--v private tag
 259         if ($file !~ m!,!) {
 260             my $oldfile = $file;
 261             $file =~ s!--!,!;
 262             print STDERR "converting old tag $oldfile to $file\n";
 263             rename("$ptag_dir/$oldfile", "$ptag_dir/$file") or die $!;
 264         }
 265         my $sha = ptag($file);
 266         chomp $sha;
 267         $rptags{$sha} = $file;
 268     }
 269     closedir DIR;
 270 }
 271
 272 # process patchsets
 273 # extract the Arch repository name (Arch "archive" in Arch-speak)
 274 sub extract_reponame {
 275     my $fq_cvbr = shift; # archivename/[[[[category]branch]version]revision]
 276     return (split(/\//, $fq_cvbr))[0];
 277 }
 278
 279 sub extract_versionname {
 280     my $name = shift;
 281     $name =~ s/--(?:patch|version(?:fix)?|base)-\d+$//;
 282     return $name;
 283 }
 284
 285 # convert a fully-qualified revision or version to a unique dirname:
 286 #   normalperson@yhbt.net-05/mpd--uclinux--1--patch-2
 287 # becomes: normalperson@yhbt.net-05,mpd--uclinux--1
 288 #
 289 # the git notion of a branch is closer to
 290 # archive/category--branch--version than archive/category--branch, so we
 291 # use this to convert to git branch names.
 292 # Also, keep archive names but replace '/' with ',' since it won't require
 293 # subdirectories, and is safer than swapping '--' which could confuse
 294 # reverse-mapping when dealing with bastard branches that
 295 # are just archive/category--version  (no --branch)
 296 sub tree_dirname {
 297     my $revision = shift;
 298     my $name = extract_versionname($revision);
 299     $name =~ s#/#,#;
 300     return $name;
 301 }
 302
 303 # old versions of git-archimport just use the <category--branch> part:
 304 sub old_style_branchname {
 305     my $id = shift;
 306     my $ret = safe_pipe_capture($TLA,'parse-package-name','-p',$id);
 307     chomp $ret;
 308     return $ret;
 309 }
 310
 311 *git_default_branchname = $opt_o ? *old_style_branchname : *tree_dirname;
 312
 313 # retrieve default archive, since $branch_name_map keys might not include it
 314 sub get_default_archive {
 315     if (!defined $default_archive) {
 316         $default_archive = safe_pipe_capture($TLA,'my-default-archive');
 317         chomp $default_archive;
 318     }
 319     return $default_archive;
 320 }
 321
 322 sub git_branchname {
 323     my $revision = shift;
 324     my $name = extract_versionname($revision);
 325
 326     if (exists $branch_name_map{$name}) {
 327         return $branch_name_map{$name};
 328
 329     } elsif ($name =~ m#^([^/]*)/(.*)$#
 330              && $1 eq get_default_archive()
 331              && exists $branch_name_map{$2}) {
 332         # the names given in the command-line lacked the archive.
 333         return $branch_name_map{$2};
 334
 335     } else {
 336         return git_default_branchname($revision);
 337     }
 338 }
 339
 340 sub process_patchset_accurate {
 341     my $ps = shift;
 342
 343     # switch to that branch if we're not already in that branch:
 344     if (-e "$git_dir/refs/heads/$ps->{branch}") {
 345        system('git-checkout','-f',$ps->{branch}) == 0 or die "$! $?\n";
 346
 347        # remove any old stuff that got leftover:
 348        my $rm = safe_pipe_capture('git-ls-files','--others','-z');
 349        rmtree(split(/\0/,$rm)) if $rm;
 350     }
 351
 352     # Apply the import/changeset/merge into the working tree
 353     my $dir = sync_to_ps($ps);
 354     # read the new log entry:
 355     my @commitlog = safe_pipe_capture($TLA,'cat-log','-d',$dir,$ps->{id});
 356     die "Error in cat-log: $!" if $?;
 357     chomp @commitlog;
 358
 359     # grab variables we want from the log, new fields get added to $ps:
 360     # (author, date, email, summary, message body ...)
 361     parselog($ps, \@commitlog);
 362
 363     if ($ps->{id} =~ /--base-0$/ && $ps->{id} ne $psets[0]{id}) {
 364         # this should work when importing continuations
 365         if ($ps->{tag} && (my $branchpoint = eval { ptag($ps->{tag}) })) {
 366
 367             # find where we are supposed to branch from
 368             if (! -e "$git_dir/refs/heads/$ps->{branch}") {
 369                 system('git-branch',$ps->{branch},$branchpoint) == 0 or die "$! $?\n";
 370
 371                 # We trust Arch with the fact that this is just a tag,
 372                 # and it does not affect the state of the tree, so
 373                 # we just tag and move on.  If the user really wants us
 374                 # to consolidate more branches into one, don't tag because
 375                 # the tag name would be already taken.
 376                 tag($ps->{id}, $branchpoint);
 377                 ptag($ps->{id}, $branchpoint);
 378                 print " * Tagged $ps->{id} at $branchpoint\n";
 379             }
 380             system('git-checkout','-f',$ps->{branch}) == 0 or die "$! $?\n";
 381
 382             # remove any old stuff that got leftover:
 383             my $rm = safe_pipe_capture('git-ls-files','--others','-z');
 384             rmtree(split(/\0/,$rm)) if $rm;
 385             return 0;
 386         } else {
 387             warn "Tagging from unknown id unsupported\n" if $ps->{tag};
 388         }
 389         # allow multiple bases/imports here since Arch supports cherry-picks
 390         # from unrelated trees
 391     }
 392
 393     # update the index with all the changes we got
 394     system('git-diff-files --name-only -z | '.
 395             'git-update-index --remove -z --stdin') == 0 or die "$! $?\n";
 396     system('git-ls-files --others -z | '.
 397             'git-update-index --add -z --stdin') == 0 or die "$! $?\n";
 398     return 1;
 399 }
 400
 401 # the native changeset processing strategy.  This is very fast, but
 402 # does not handle permissions or any renames involving directories
 403 sub process_patchset_fast {
 404     my $ps = shift;
 405     #
 406     # create the branch if needed
 407     #
 408     if ($ps->{type} eq 'i' && !$import) {
 409         die "Should not have more than one 'Initial import' per GIT import: $ps->{id}";
 410     }
 411
 412     unless ($import) { # skip for import
 413         if ( -e "$git_dir/refs/heads/$ps->{branch}") {
 414             # we know about this branch
 415             system('git-checkout',$ps->{branch});
 416         } else {
 417             # new branch! we need to verify a few things
 418             die "Branch on a non-tag!" unless $ps->{type} eq 't';
 419             my $branchpoint = ptag($ps->{tag});
 420             die "Tagging from unknown id unsupported: $ps->{tag}"
 421                 unless $branchpoint;
 422
 423             # find where we are supposed to branch from
 424             if (! -e "$git_dir/refs/heads/$ps->{branch}") {
 425                 system('git-branch',$ps->{branch},$branchpoint) == 0 or die "$! $?\n";
 426
 427                 # We trust Arch with the fact that this is just a tag,
 428                 # and it does not affect the state of the tree, so
 429                 # we just tag and move on.  If the user really wants us
 430                 # to consolidate more branches into one, don't tag because
 431                 # the tag name would be already taken.
 432                 tag($ps->{id}, $branchpoint);
 433                 ptag($ps->{id}, $branchpoint);
 434                 print " * Tagged $ps->{id} at $branchpoint\n";
 435             }
 436             system('git-checkout',$ps->{branch}) == 0 or die "$! $?\n";
 437             return 0;
 438         }
 439         die $! if $?;
 440     }
 441
 442     #
 443     # Apply the import/changeset/merge into the working tree
 444     #
 445     if ($ps->{type} eq 'i' || $ps->{type} eq 't') {
 446         apply_import($ps) or die $!;
 447         $stats{import_or_tag}++;
 448         $import=0;
 449     } elsif ($ps->{type} eq 's') {
 450         apply_cset($ps);
 451         $stats{simple_changeset}++;
 452     }
 453
 454     #
 455     # prepare update git's index, based on what arch knows
 456     # about the pset, resolve parents, etc
 457     #
 458
 459     my @commitlog = safe_pipe_capture($TLA,'cat-archive-log',$ps->{id});
 460     die "Error in cat-archive-log: $!" if $?;
 461
 462     parselog($ps,\@commitlog);
 463
 464     # imports don't give us good info
 465     # on added files. Shame on them
 466     if ($ps->{type} eq 'i' || $ps->{type} eq 't') {
 467         system('git-ls-files --deleted -z | '.
 468                 'git-update-index --remove -z --stdin') == 0 or die "$! $?\n";
 469         system('git-ls-files --others -z | '.
 470                 'git-update-index --add -z --stdin') == 0 or die "$! $?\n";
 471     }
 472
 473     # TODO: handle removed_directories and renamed_directories:
 474
 475     if (my $del = $ps->{removed_files}) {
 476         unlink @$del;
 477         while (@$del) {
 478             my @slice = splice(@$del, 0, 100);
 479             system('git-update-index','--remove','--',@slice) == 0 or
 480                             die "Error in git-update-index --remove: $! $?\n";
 481         }
 482     }
 483
 484     if (my $ren = $ps->{renamed_files}) {                # renamed
 485         if (@$ren % 2) {
 486             die "Odd number of entries in rename!?";
 487         }
 488
 489         while (@$ren) {
 490             my $from = shift @$ren;
 491             my $to   = shift @$ren;
 492
 493             unless (-d dirname($to)) {
 494                 mkpath(dirname($to)); # will die on err
 495             }
 496             # print "moving $from $to";
 497             rename($from, $to) or die "Error renaming '$from' '$to': $!\n";
 498             system('git-update-index','--remove','--',$from) == 0 or
 499                             die "Error in git-update-index --remove: $! $?\n";
 500             system('git-update-index','--add','--',$to) == 0 or
 501                             die "Error in git-update-index --add: $! $?\n";
 502         }
 503     }
 504
 505     if (my $add = $ps->{new_files}) {
 506         while (@$add) {
 507             my @slice = splice(@$add, 0, 100);
 508             system('git-update-index','--add','--',@slice) == 0 or
 509                             die "Error in git-update-index --add: $! $?\n";
 510         }
 511     }
 512
 513     if (my $mod = $ps->{modified_files}) {
 514         while (@$mod) {
 515             my @slice = splice(@$mod, 0, 100);
 516             system('git-update-index','--',@slice) == 0 or
 517                             die "Error in git-update-index: $! $?\n";
 518         }
 519     }
 520     return 1; # we successfully applied the changeset
 521 }
 522
 523 if ($opt_f) {
 524     print "Will import patchsets using the fast strategy\n",
 525             "Renamed directories and permission changes will be missed\n";
 526     *process_patchset = *process_patchset_fast;
 527 } else {
 528     print "Using the default (accurate) import strategy.\n",
 529             "Things may be a bit slow\n";
 530     *process_patchset = *process_patchset_accurate;
 531 }
 532
 533 foreach my $ps (@psets) {
 534     # process patchsets
 535     $ps->{branch} = git_branchname($ps->{id});
 536
 537     #
 538     # ensure we have a clean state
 539     #
 540     if (my $dirty = `git-diff-files`) {
 541         die "Unclean tree when about to process $ps->{id} " .
 542             " - did we fail to commit cleanly before?\n$dirty";
 543     }
 544     die $! if $?;
 545
 546     #
 547     # skip commits already in repo
 548     #
 549     if (ptag($ps->{id})) {
 550       $opt_v && print " * Skipping already imported: $ps->{id}\n";
 551       next;
 552     }
 553
 554     print " * Starting to work on $ps->{id}\n";
 555
 556     process_patchset($ps) or next;
 557
 558     # warn "errors when running git-update-index! $!";
 559     my $tree = `git-write-tree`;
 560     die "cannot write tree $!" if $?;
 561     chomp $tree;
 562
 563     #
 564     # Who's your daddy?
 565     #
 566     my @par;
 567     if ( -e "$git_dir/refs/heads/$ps->{branch}") {
 568         if (open HEAD, "<","$git_dir/refs/heads/$ps->{branch}") {
 569             my $p = <HEAD>;
 570             close HEAD;
 571             chomp $p;
 572             push @par, '-p', $p;
 573         } else {
 574             if ($ps->{type} eq 's') {
 575                 warn "Could not find the right head for the branch $ps->{branch}";
 576             }
 577         }
 578     }
 579
 580     if ($ps->{merges}) {
 581         push @par, find_parents($ps);
 582     }
 583
 584     #
 585     # Commit, tag and clean state
 586     #
 587     $ENV{TZ}                  = 'GMT';
 588     $ENV{GIT_AUTHOR_NAME}     = $ps->{author};
 589     $ENV{GIT_AUTHOR_EMAIL}    = $ps->{email};
 590     $ENV{GIT_AUTHOR_DATE}     = $ps->{date};
 591     $ENV{GIT_COMMITTER_NAME}  = $ps->{author};
 592     $ENV{GIT_COMMITTER_EMAIL} = $ps->{email};
 593     $ENV{GIT_COMMITTER_DATE}  = $ps->{date};
 594
 595     my $pid = open2(*READER, *WRITER,'git-commit-tree',$tree,@par)
 596         or die $!;
 597     print WRITER $ps->{summary},"\n\n";
 598     print WRITER $ps->{message},"\n";
 599
 600     # make it easy to backtrack and figure out which Arch revision this was:
 601     print WRITER 'git-archimport-id: ',$ps->{id},"\n";
 602
 603     close WRITER;
 604     my $commitid = <READER>;    # read
 605     chomp $commitid;
 606     close READER;
 607     waitpid $pid,0;             # close;
 608
 609     if (length $commitid != 40) {
 610         die "Something went wrong with the commit! $! $commitid";
 611     }
 612     #
 613     # Update the branch
 614     #
 615     open  HEAD, ">","$git_dir/refs/heads/$ps->{branch}";
 616     print HEAD $commitid;
 617     close HEAD;
 618     system('git-update-ref', 'HEAD', "$ps->{branch}");
 619
 620     # tag accordingly
 621     ptag($ps->{id}, $commitid); # private tag
 622     if ($opt_T || $ps->{type} eq 't' || $ps->{type} eq 'i') {
 623         tag($ps->{id}, $commitid);
 624     }
 625     print " * Committed $ps->{id}\n";
 626     print "   + tree   $tree\n";
 627     print "   + commit $commitid\n";
 628     $opt_v && print "   + commit date is  $ps->{date} \n";
 629     $opt_v && print "   + parents:  ",join(' ',@par),"\n";
 630 }
 631
 632 if ($opt_v) {
 633     foreach (sort keys %stats) {
 634         print" $_: $stats{$_}\n";
 635     }
 636 }
 637 exit 0;
 638
 639 # used by the accurate strategy:
 640 sub sync_to_ps {
 641     my $ps = shift;
 642     my $tree_dir = $tmp.'/'.tree_dirname($ps->{id});
 643
 644     $opt_v && print "sync_to_ps($ps->{id}) method: ";
 645
 646     if (-d $tree_dir) {
 647         if ($ps->{type} eq 't') {
 648             $opt_v && print "get (tag)\n";
 649             # looks like a tag-only or (worse,) a mixed tags/changeset branch,
 650             # can't rely on replay to work correctly on these
 651             rmtree($tree_dir);
 652             safe_pipe_capture($TLA,'get','--no-pristine',$ps->{id},$tree_dir);
 653             $stats{get_tag}++;
 654         } else {
 655                 my $tree_id = arch_tree_id($tree_dir);
 656                 if ($ps->{parent_id} && ($ps->{parent_id} eq $tree_id)) {
 657                     # the common case (hopefully)
 658                     $opt_v && print "replay\n";
 659                     safe_pipe_capture($TLA,'replay','-d',$tree_dir,$ps->{id});
 660                     $stats{replay}++;
 661                 } else {
 662                     # getting one tree is usually faster than getting two trees
 663                     # and applying the delta ...
 664                     rmtree($tree_dir);
 665                     $opt_v && print "apply-delta\n";
 666                     safe_pipe_capture($TLA,'get','--no-pristine',
 667                                         $ps->{id},$tree_dir);
 668                     $stats{get_delta}++;
 669                 }
 670         }
 671     } else {
 672         # new branch work
 673         $opt_v && print "get (new tree)\n";
 674         safe_pipe_capture($TLA,'get','--no-pristine',$ps->{id},$tree_dir);
 675         $stats{get_new}++;
 676     }
 677
 678     # added -I flag to rsync since we're going to fast! AIEEEEE!!!!
 679     system('rsync','-aI','--delete','--exclude',$git_dir,
 680 #               '--exclude','.arch-inventory',
 681                 '--exclude','.arch-ids','--exclude','{arch}',
 682                 '--exclude','+*','--exclude',',*',
 683                 "$tree_dir/",'./') == 0 or die "Cannot rsync $tree_dir: $! $?";
 684     return $tree_dir;
 685 }
 686
 687 sub apply_import {
 688     my $ps = shift;
 689     my $bname = git_branchname($ps->{id});
 690
 691     mkpath($tmp);
 692
 693     safe_pipe_capture($TLA,'get','-s','--no-pristine',$ps->{id},"$tmp/import");
 694     die "Cannot get import: $!" if $?;
 695     system('rsync','-aI','--delete', '--exclude',$git_dir,
 696                 '--exclude','.arch-ids','--exclude','{arch}',
 697                 "$tmp/import/", './');
 698     die "Cannot rsync import:$!" if $?;
 699
 700     rmtree("$tmp/import");
 701     die "Cannot remove tempdir: $!" if $?;
 702
 703
 704     return 1;
 705 }
 706
 707 sub apply_cset {
 708     my $ps = shift;
 709
 710     mkpath($tmp);
 711
 712     # get the changeset
 713     safe_pipe_capture($TLA,'get-changeset',$ps->{id},"$tmp/changeset");
 714     die "Cannot get changeset: $!" if $?;
 715
 716     # apply patches
 717     if (`find $tmp/changeset/patches -type f -name '*.patch'`) {
 718         # this can be sped up considerably by doing
 719         #    (find | xargs cat) | patch
 720         # but that can get mucked up by patches
 721         # with missing trailing newlines or the standard
 722         # 'missing newline' flag in the patch - possibly
 723         # produced with an old/buggy diff.
 724         # slow and safe, we invoke patch once per patchfile
 725         `find $tmp/changeset/patches -type f -name '*.patch' -print0 | grep -zv '{arch}' | xargs -iFILE -0 --no-run-if-empty patch -p1 --forward -iFILE`;
 726         die "Problem applying patches! $!" if $?;
 727     }
 728
 729     # apply changed binary files
 730     if (my @modified = `find $tmp/changeset/patches -type f -name '*.modified'`) {
 731         foreach my $mod (@modified) {
 732             chomp $mod;
 733             my $orig = $mod;
 734             $orig =~ s/\.modified$//; # lazy
 735             $orig =~ s!^\Q$tmp\E/changeset/patches/!!;
 736             #print "rsync -p '$mod' '$orig'";
 737             system('rsync','-p',$mod,"./$orig");
 738             die "Problem applying binary changes! $!" if $?;
 739         }
 740     }
 741
 742     # bring in new files
 743     system('rsync','-aI','--exclude',$git_dir,
 744                 '--exclude','.arch-ids',
 745                 '--exclude', '{arch}',
 746                 "$tmp/changeset/new-files-archive/",'./');
 747
 748     # deleted files are hinted from the commitlog processing
 749
 750     rmtree("$tmp/changeset");
 751 }
 752
 753
 754 # =for reference
 755 # notes: *-files/-directories keys cannot have spaces, they're always
 756 # pika-escaped.  Everything after the first newline
 757 # A log entry looks like:
 758 # Revision: moodle-org--moodle--1.3.3--patch-15
 759 # Archive: arch-eduforge@catalyst.net.nz--2004
 760 # Creator: Penny Leach <penny@catalyst.net.nz>
 761 # Date: Wed May 25 14:15:34 NZST 2005
 762 # Standard-date: 2005-05-25 02:15:34 GMT
 763 # New-files: lang/de/.arch-ids/block_glossary_random.php.id
 764 #     lang/de/.arch-ids/block_html.php.id
 765 # New-directories: lang/de/help/questionnaire
 766 #     lang/de/help/questionnaire/.arch-ids
 767 # Renamed-files: .arch-ids/db_sears.sql.id db/.arch-ids/db_sears.sql.id
 768 #    db_sears.sql db/db_sears.sql
 769 # Removed-files: lang/be/docs/.arch-ids/release.html.id
 770 #     lang/be/docs/.arch-ids/releaseold.html.id
 771 # Modified-files: admin/cron.php admin/delete.php
 772 #     admin/editor.html backup/lib.php backup/restore.php
 773 # New-patches: arch-eduforge@catalyst.net.nz--2004/moodle-org--moodle--1.3.3--patch-15
 774 # Summary: Updating to latest from MOODLE_14_STABLE (1.4.5+)
 775 #   summary can be multiline with a leading space just like the above fields
 776 # Keywords:
 777 #
 778 # Updating yadda tadda tadda madda
 779 sub parselog {
 780     my ($ps, $log) = @_;
 781     my $key = undef;
 782
 783     # headers we want that contain filenames:
 784     my %want_headers = (
 785         new_files => 1,
 786         modified_files => 1,
 787         renamed_files => 1,
 788         renamed_directories => 1,
 789         removed_files => 1,
 790         removed_directories => 1,
 791     );
 792
 793     chomp (@$log);
 794     while ($_ = shift @$log) {
 795         if (/^Continuation-of:\s*(.*)/) {
 796             $ps->{tag} = $1;
 797             $key = undef;
 798         } elsif (/^Summary:\s*(.*)$/ ) {
 799             # summary can be multiline as long as it has a leading space.
 800             # we squeeze it onto a single line, though.
 801             $ps->{summary} = [ $1 ];
 802             $key = 'summary';
 803         } elsif (/^Creator: (.*)\s*<([^\>]+)>/) {
 804             $ps->{author} = $1;
 805             $ps->{email} = $2;
 806             $key = undef;
 807         # any *-files or *-directories can be read here:
 808         } elsif (/^([A-Z][a-z\-]+):\s*(.*)$/) {
 809             my $val = $2;
 810             $key = lc $1;
 811             $key =~ tr/-/_/; # too lazy to quote :P
 812             if ($want_headers{$key}) {
 813                 push @{$ps->{$key}}, split(/\s+/, $val);
 814             } else {
 815                 $key = undef;
 816             }
 817         } elsif (/^$/) {
 818             last; # remainder of @$log that didn't get shifted off is message
 819         } elsif ($key) {
 820             if (/^\s+(.*)$/) {
 821                 if ($key eq 'summary') {
 822                     push @{$ps->{$key}}, $1;
 823                 } else { # files/directories:
 824                     push @{$ps->{$key}}, split(/\s+/, $1);
 825                 }
 826             } else {
 827                 $key = undef;
 828             }
 829         }
 830     }
 831
 832     # drop leading empty lines from the log message
 833     while (@$log && $log->[0] eq '') {
 834         shift @$log;
 835     }
 836     if (exists $ps->{summary} && @{$ps->{summary}}) {
 837         $ps->{summary} = join(' ', @{$ps->{summary}});
 838     }
 839     elsif (@$log == 0) {
 840         $ps->{summary} = 'empty commit message';
 841     } else {
 842         $ps->{summary} = $log->[0] . '...';
 843     }
 844     $ps->{message} = join("\n",@$log);
 845
 846     # skip Arch control files, unescape pika-escaped files
 847     foreach my $k (keys %want_headers) {
 848         next unless (defined $ps->{$k});
 849         my @tmp = ();
 850         foreach my $t (@{$ps->{$k}}) {
 851            next unless length ($t);
 852            next if $t =~ m!\{arch\}/!;
 853            next if $t =~ m!\.arch-ids/!;
 854            # should we skip this?
 855            next if $t =~ m!\.arch-inventory$!;
 856            # tla cat-archive-log will give us filenames with spaces as file\(sp)name - why?
 857            # we can assume that any filename with \ indicates some pika escaping that we want to get rid of.
 858            if ($t =~ /\\/ ){
 859                $t = (safe_pipe_capture($TLA,'escape','--unescaped',$t))[0];
 860            }
 861            push @tmp, $t;
 862         }
 863         $ps->{$k} = \@tmp;
 864     }
 865 }
 866
 867 # write/read a tag
 868 sub tag {
 869     my ($tag, $commit) = @_;
 870
 871     if ($opt_o) {
 872         $tag =~ s|/|--|g;
 873     } else {
 874         my $patchname = $tag;
 875         $patchname =~ s/.*--//;
 876         $tag = git_branchname ($tag) . '--' . $patchname;
 877     }
 878
 879     if ($commit) {
 880         open(C,">","$git_dir/refs/tags/$tag")
 881             or die "Cannot create tag $tag: $!\n";
 882         print C "$commit\n"
 883             or die "Cannot write tag $tag: $!\n";
 884         close(C)
 885             or die "Cannot write tag $tag: $!\n";
 886         print " * Created tag '$tag' on '$commit'\n" if $opt_v;
 887     } else {                    # read
 888         open(C,"<","$git_dir/refs/tags/$tag")
 889             or die "Cannot read tag $tag: $!\n";
 890         $commit = <C>;
 891         chomp $commit;
 892         die "Error reading tag $tag: $!\n" unless length $commit == 40;
 893         close(C)
 894             or die "Cannot read tag $tag: $!\n";
 895         return $commit;
 896     }
 897 }
 898
 899 # write/read a private tag
 900 # reads fail softly if the tag isn't there
 901 sub ptag {
 902     my ($tag, $commit) = @_;
 903
 904     # don't use subdirs for tags yet, it could screw up other porcelains
 905     $tag =~ s|/|,|g;
 906
 907     my $tag_file = "$ptag_dir/$tag";
 908     my $tag_branch_dir = dirname($tag_file);
 909     mkpath($tag_branch_dir) unless (-d $tag_branch_dir);
 910
 911     if ($commit) {              # write
 912         open(C,">",$tag_file)
 913             or die "Cannot create tag $tag: $!\n";
 914         print C "$commit\n"
 915             or die "Cannot write tag $tag: $!\n";
 916         close(C)
 917             or die "Cannot write tag $tag: $!\n";
 918         $rptags{$commit} = $tag
 919             unless $tag =~ m/--base-0$/;
 920     } else {                    # read
 921         # if the tag isn't there, return 0
 922         unless ( -s $tag_file) {
 923             return 0;
 924         }
 925         open(C,"<",$tag_file)
 926             or die "Cannot read tag $tag: $!\n";
 927         $commit = <C>;
 928         chomp $commit;
 929         die "Error reading tag $tag: $!\n" unless length $commit == 40;
 930         close(C)
 931             or die "Cannot read tag $tag: $!\n";
 932         unless (defined $rptags{$commit}) {
 933             $rptags{$commit} = $tag;
 934         }
 935         return $commit;
 936     }
 937 }
 938
 939 sub find_parents {
 940     #
 941     # Identify what branches are merging into me
 942     # and whether we are fully merged
 943     # git-merge-base <headsha> <headsha> should tell
 944     # me what the base of the merge should be
 945     #
 946     my $ps = shift;
 947
 948     my %branches; # holds an arrayref per branch
 949                   # the arrayref contains a list of
 950                   # merged patches between the base
 951                   # of the merge and the current head
 952
 953     my @parents;  # parents found for this commit
 954
 955     # simple loop to split the merges
 956     # per branch
 957     foreach my $merge (@{$ps->{merges}}) {
 958         my $branch = git_branchname($merge);
 959         unless (defined $branches{$branch} ){
 960             $branches{$branch} = [];
 961         }
 962         push @{$branches{$branch}}, $merge;
 963     }
 964
 965     #
 966     # foreach branch find a merge base and walk it to the
 967     # head where we are, collecting the merged patchsets that
 968     # Arch has recorded. Keep that in @have
 969     # Compare that with the commits on the other branch
 970     # between merge-base and the tip of the branch (@need)
 971     # and see if we have a series of consecutive patches
 972     # starting from the merge base. The tip of the series
 973     # of consecutive patches merged is our new parent for
 974     # that branch.
 975     #
 976     foreach my $branch (keys %branches) {
 977
 978         # check that we actually know about the branch
 979         next unless -e "$git_dir/refs/heads/$branch";
 980
 981         my $mergebase = `git-merge-base $branch $ps->{branch}`;
 982         if ($?) {
 983             # Don't die here, Arch supports one-way cherry-picking
 984             # between branches with no common base (or any relationship
 985             # at all beforehand)
 986             warn "Cannot find merge base for $branch and $ps->{branch}";
 987             next;
 988         }
 989         chomp $mergebase;
 990
 991         # now walk up to the mergepoint collecting what patches we have
 992         my $branchtip = git_rev_parse($ps->{branch});
 993         my @ancestors = `git-rev-list --topo-order $branchtip ^$mergebase`;
 994         my %have; # collected merges this branch has
 995         foreach my $merge (@{$ps->{merges}}) {
 996             $have{$merge} = 1;
 997         }
 998         my %ancestorshave;
 999         foreach my $par (@ancestors) {
1000             $par = commitid2pset($par);
1001             if (defined $par->{merges}) {
1002                 foreach my $merge (@{$par->{merges}}) {
1003                     $ancestorshave{$merge}=1;
1004                 }
1005             }
1006         }
1007         # print "++++ Merges in $ps->{id} are....\n";
1008         # my @have = sort keys %have;   print Dumper(\@have);
1009
1010         # merge what we have with what ancestors have
1011         %have = (%have, %ancestorshave);
1012
1013         # see what the remote branch has - these are the merges we
1014         # will want to have in a consecutive series from the mergebase
1015         my $otherbranchtip = git_rev_parse($branch);
1016         my @needraw = `git-rev-list --topo-order $otherbranchtip ^$mergebase`;
1017         my @need;
1018         foreach my $needps (@needraw) {         # get the psets
1019             $needps = commitid2pset($needps);
1020             # git-rev-list will also
1021             # list commits merged in via earlier
1022             # merges. we are only interested in commits
1023             # from the branch we're looking at
1024             if ($branch eq $needps->{branch}) {
1025                 push @need, $needps->{id};
1026             }
1027         }
1028
1029         # print "++++ Merges from $branch we want are....\n";
1030         # print Dumper(\@need);
1031
1032         my $newparent;
1033         while (my $needed_commit = pop @need) {
1034             if ($have{$needed_commit}) {
1035                 $newparent = $needed_commit;
1036             } else {
1037                 last; # break out of the while
1038             }
1039         }
1040         if ($newparent) {
1041             push @parents, $newparent;
1042         }
1043
1044
1045     } # end foreach branch
1046
1047     # prune redundant parents
1048     my %parents;
1049     foreach my $p (@parents) {
1050         $parents{$p} = 1;
1051     }
1052     foreach my $p (@parents) {
1053         next unless exists $psets{$p}{merges};
1054         next unless ref    $psets{$p}{merges};
1055         my @merges = @{$psets{$p}{merges}};
1056         foreach my $merge (@merges) {
1057             if ($parents{$merge}) {
1058                 delete $parents{$merge};
1059             }
1060         }
1061     }
1062
1063     @parents = ();
1064     foreach (keys %parents) {
1065         push @parents, '-p', ptag($_);
1066     }
1067     return @parents;
1068 }
1069
1070 sub git_rev_parse {
1071     my $name = shift;
1072     my $val  = `git-rev-parse $name`;
1073     die "Error: git-rev-parse $name" if $?;
1074     chomp $val;
1075     return $val;
1076 }
1077
1078 # resolve a SHA1 to a known patchset
1079 sub commitid2pset {
1080     my $commitid = shift;
1081     chomp $commitid;
1082     my $name = $rptags{$commitid}
1083         || die "Cannot find reverse tag mapping for $commitid";
1084     $name =~ s|,|/|;
1085     my $ps   = $psets{$name}
1086         || (print Dumper(sort keys %psets)) && die "Cannot find patchset for $name";
1087     return $ps;
1088 }
1089
1090
1091 # an alternative to `command` that allows input to be passed as an array
1092 # to work around shell problems with weird characters in arguments
1093 sub safe_pipe_capture {
1094     my @output;
1095     if (my $pid = open my $child, '-|') {
1096         @output = (<$child>);
1097         close $child or die join(' ',@_).": $! $?";
1098     } else {
1099         exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
1100     }
1101     return wantarray ? @output : join('',@output);
1102 }
1103
1104 # `tla logs -rf -d <dir> | head -n1` or `baz tree-id <dir>`
1105 sub arch_tree_id {
1106     my $dir = shift;
1107     chomp( my $ret = (safe_pipe_capture($TLA,'logs','-rf','-d',$dir))[0] );
1108     return $ret;
1109 }
1110
1111 sub archive_reachable {
1112     my $archive = shift;
1113     return 1 if $reachable{$archive};
1114     return 0 if $unreachable{$archive};
1115
1116     if (system "$TLA whereis-archive $archive >/dev/null") {
1117         if ($opt_a && (system($TLA,'register-archive',
1118                       "http://mirrors.sourcecontrol.net/$archive") == 0)) {
1119             $reachable{$archive} = 1;
1120             return 1;
1121         }
1122         print STDERR "Archive is unreachable: $archive\n";
1123         $unreachable{$archive} = 1;
1124         return 0;
1125     } else {
1126         $reachable{$archive} = 1;
1127         return 1;
1128     }
1129 }