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