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