Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: 3328acedc6
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

executable file 1135 lines (981 sloc) 36.893 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
#!/usr/bin/perl
#
# This tool is copyright (c) 2005, Martin Langhoff.
# It is released under the Gnu Public License, version 2.
#
# The basic idea is to walk the output of tla abrowse,
# fetch the changesets and apply them.
#

=head1 Invocation

git archimport [ -h ] [ -v ] [ -o ] [ -a ] [ -f ] [ -T ]
[ -D depth] [ -t tempdir ] <archive>/<branch> [ <archive>/<branch> ]

Imports a project from one or more Arch repositories. It will follow branches
and repositories within the namespaces defined by the <archive/branch>
parameters supplied. If it cannot find the remote branch a merge comes from
it will just import it as a regular commit. If it can find it, it will mark it
as a merge whenever possible.

See man (1) git-archimport for more details.

=head1 TODO

- create tag objects instead of ref tags
- audit shell-escaping of filenames
- hide our private tags somewhere smarter
- find a way to make "cat *patches | patch" safe even when patchfiles are missing newlines
- sort and apply patches by graphing ancestry relations instead of just
relying in dates supplied in the changeset itself.
tla ancestry-graph -m could be helpful here...

=head1 Devel tricks

Add print in front of the shell commands invoked via backticks.

=head1 Devel Notes

There are several places where Arch and git terminology are intermixed
and potentially confused.

The notion of a "branch" in git is approximately equivalent to
a "archive/category--branch--version" in Arch. Also, it should be noted
that the "--branch" portion of "archive/category--branch--version" is really
optional in Arch although not many people (nor tools!) seem to know this.
This means that "archive/category--version" is also a valid "branch"
in git terms.

We always refer to Arch names by their fully qualified variant (which
means the "archive" name is prefixed.

For people unfamiliar with Arch, an "archive" is the term for "repository",
and can contain multiple, unrelated branches.

=cut

use 5.008;
use strict;
use warnings;
use Getopt::Std;
use File::Temp qw(tempdir);
use File::Path qw(mkpath rmtree);
use File::Basename qw(basename dirname);
use Data::Dumper qw/ Dumper /;
use IPC::Open2;

$SIG{'PIPE'}="IGNORE";
$ENV{'TZ'}="UTC";

my $git_dir = $ENV{"GIT_DIR"} || ".git";
$ENV{"GIT_DIR"} = $git_dir;
my $ptag_dir = "$git_dir/archimport/tags";

our($opt_h,$opt_f,$opt_v,$opt_T,$opt_t,$opt_D,$opt_a,$opt_o);

sub usage() {
    print STDERR <<END;
Usage: git archimport # fetch/update GIT from Arch
[ -h ] [ -v ] [ -o ] [ -a ] [ -f ] [ -T ] [ -D depth ] [ -t tempdir ]
repository/arch-branch [ repository/arch-branch] ...
END
    exit(1);
}

getopts("fThvat:D:") or usage();
usage if $opt_h;

@ARGV >= 1 or usage();
# $arch_branches:
# values associated with keys:
# =1 - Arch version / git 'branch' detected via abrowse on a limit
# >1 - Arch version / git 'branch' of an auxiliary branch we've merged
my %arch_branches = map { my $branch = $_; $branch =~ s/:[^:]*$//; $branch => 1 } @ARGV;

# $branch_name_map:
# maps arch branches to git branch names
my %branch_name_map = map { m/^(.*):([^:]*)$/; $1 => $2 } grep { m/:/ } @ARGV;

$ENV{'TMPDIR'} = $opt_t if $opt_t; # $ENV{TMPDIR} will affect tempdir() calls:
my $tmp = tempdir('git-archimport-XXXXXX', TMPDIR => 1, CLEANUP => 1);
$opt_v && print "+ Using $tmp as temporary directory\n";

unless (-d $git_dir) { # initial import needs empty directory
    opendir DIR, '.' or die "Unable to open current directory: $!\n";
    while (my $entry = readdir DIR) {
        $entry =~ /^\.\.?$/ or
            die "Initial import needs an empty current working directory.\n"
    }
    closedir DIR
}

my $default_archive; # default Arch archive
my %reachable = (); # Arch repositories we can access
my %unreachable = (); # Arch repositories we can't access :<
my @psets = (); # the collection
my %psets = (); # the collection, by name
my %stats = ( # Track which strategy we used to import:
get_tag => 0, replay => 0, get_new => 0, get_delta => 0,
        simple_changeset => 0, import_or_tag => 0
);

my %rptags = (); # my reverse private tags
                                # to map a SHA1 to a commitid
my $TLA = $ENV{'ARCH_CLIENT'} || 'tla';

sub do_abrowse {
    my $stage = shift;
    while (my ($limit, $level) = each %arch_branches) {
        next unless $level == $stage;

open ABROWSE, "$TLA abrowse -fkD --merges $limit |"
                                or die "Problems with tla abrowse: $!";

        my %ps = (); # the current one
        my $lastseen = '';

        while (<ABROWSE>) {
            chomp;

            # first record padded w 8 spaces
            if (s/^\s{8}\b//) {
                my ($id, $type) = split(m/\s+/, $_, 2);

                my %last_ps;
                # store the record we just captured
                if (%ps && !exists $psets{ $ps{id} }) {
                    %last_ps = %ps; # break references
                    push (@psets, \%last_ps);
                    $psets{ $last_ps{id} } = \%last_ps;
                }

                my $branch = extract_versionname($id);
                %ps = ( id => $id, branch => $branch );
                if (%last_ps && ($last_ps{branch} eq $branch)) {
                    $ps{parent_id} = $last_ps{id};
                }

                $arch_branches{$branch} = 1;
                $lastseen = 'id';

                # deal with types (should work with baz or tla):
                if ($type =~ m/\(.*changeset\)/) {
                    $ps{type} = 's';
                } elsif ($type =~ /\(.*import\)/) {
                    $ps{type} = 'i';
                } elsif ($type =~ m/\(tag.*?(\S+\@\S+).*?\)/) {
                    $ps{type} = 't';
                    # read which revision we've tagged when we parse the log
                    $ps{tag} = $1;
                } else {
                    warn "Unknown type $type";
                }

                $arch_branches{$branch} = 1;
                $lastseen = 'id';
            } elsif (s/^\s{10}//) {
                # 10 leading spaces or more
                # indicate commit metadata

                # date
                if ($lastseen eq 'id' && m/^(\d{4}-\d\d-\d\d \d\d:\d\d:\d\d)/){
                    $ps{date} = $1;
                    $lastseen = 'date';
                } elsif ($_ eq 'merges in:') {
                    $ps{merges} = [];
                    $lastseen = 'merges';
                } elsif ($lastseen eq 'merges' && s/^\s{2}//) {
                    my $id = $_;
                    push (@{$ps{merges}}, $id);

                    # aggressive branch finding:
                    if ($opt_D) {
                        my $branch = extract_versionname($id);
                        my $repo = extract_reponame($branch);

                        if (archive_reachable($repo) &&
                                !defined $arch_branches{$branch}) {
                            $arch_branches{$branch} = $stage + 1;
                        }
                    }
                } else {
                    warn "more metadata after merges!?: $_\n" unless /^\s*$/;
                }
            }
        }

        if (%ps && !exists $psets{ $ps{id} }) {
            my %temp = %ps; # break references
            if (@psets && $psets[$#psets]{branch} eq $ps{branch}) {
                $temp{parent_id} = $psets[$#psets]{id};
            }
            push (@psets, \%temp);
            $psets{ $temp{id} } = \%temp;
        }

        close ABROWSE or die "$TLA abrowse failed on $limit\n";
    }
} # end foreach $root

do_abrowse(1);
my $depth = 2;
$opt_D ||= 0;
while ($depth <= $opt_D) {
    do_abrowse($depth);
    $depth++;
}

## Order patches by time
# FIXME see if we can find a more optimal way to do this by graphing
# the ancestry data and walking it, that way we won't have to rely on
# client-supplied dates
@psets = sort {$a->{date}.$b->{id} cmp $b->{date}.$b->{id}} @psets;

#print Dumper \@psets;

##
## TODO cleanup irrelevant patches
## and put an initial import
## or a full tag
my $import = 0;
unless (-d $git_dir) { # initial import
    if ($psets[0]{type} eq 'i' || $psets[0]{type} eq 't') {
        print "Starting import from $psets[0]{id}\n";
`git-init`;
die $! if $?;
$import = 1;
    } else {
        die "Need to start from an import or a tag -- cannot use $psets[0]{id}";
    }
} else { # progressing an import
    # load the rptags
    opendir(DIR, $ptag_dir)
|| die "can't opendir: $!";
    while (my $file = readdir(DIR)) {
        # skip non-interesting-files
        next unless -f "$ptag_dir/$file";

        # convert first '--' to '/' from old git-archimport to use
        # as an archivename/c--b--v private tag
        if ($file !~ m!,!) {
            my $oldfile = $file;
            $file =~ s!--!,!;
            print STDERR "converting old tag $oldfile to $file\n";
            rename("$ptag_dir/$oldfile", "$ptag_dir/$file") or die $!;
        }
my $sha = ptag($file);
chomp $sha;
$rptags{$sha} = $file;
    }
    closedir DIR;
}

# process patchsets
# extract the Arch repository name (Arch "archive" in Arch-speak)
sub extract_reponame {
    my $fq_cvbr = shift; # archivename/[[[[category]branch]version]revision]
    return (split(/\//, $fq_cvbr))[0];
}

sub extract_versionname {
    my $name = shift;
    $name =~ s/--(?:patch|version(?:fix)?|base)-\d+$//;
    return $name;
}

# convert a fully-qualified revision or version to a unique dirname:
# normalperson@yhbt.net-05/mpd--uclinux--1--patch-2
# becomes: normalperson@yhbt.net-05,mpd--uclinux--1
#
# the git notion of a branch is closer to
# archive/category--branch--version than archive/category--branch, so we
# use this to convert to git branch names.
# Also, keep archive names but replace '/' with ',' since it won't require
# subdirectories, and is safer than swapping '--' which could confuse
# reverse-mapping when dealing with bastard branches that
# are just archive/category--version (no --branch)
sub tree_dirname {
    my $revision = shift;
    my $name = extract_versionname($revision);
    $name =~ s#/#,#;
    return $name;
}

# old versions of git-archimport just use the <category--branch> part:
sub old_style_branchname {
    my $id = shift;
    my $ret = safe_pipe_capture($TLA,'parse-package-name','-p',$id);
    chomp $ret;
    return $ret;
}

*git_default_branchname = $opt_o ? *old_style_branchname : *tree_dirname;

# retrieve default archive, since $branch_name_map keys might not include it
sub get_default_archive {
    if (!defined $default_archive) {
        $default_archive = safe_pipe_capture($TLA,'my-default-archive');
        chomp $default_archive;
    }
    return $default_archive;
}

sub git_branchname {
    my $revision = shift;
    my $name = extract_versionname($revision);

    if (exists $branch_name_map{$name}) {
return $branch_name_map{$name};

    } elsif ($name =~ m#^([^/]*)/(.*)$#
&& $1 eq get_default_archive()
&& exists $branch_name_map{$2}) {
# the names given in the command-line lacked the archive.
return $branch_name_map{$2};

    } else {
return git_default_branchname($revision);
    }
}

sub process_patchset_accurate {
    my $ps = shift;

    # switch to that branch if we're not already in that branch:
    if (-e "$git_dir/refs/heads/$ps->{branch}") {
       system('git-checkout','-f',$ps->{branch}) == 0 or die "$! $?\n";

       # remove any old stuff that got leftover:
       my $rm = safe_pipe_capture('git-ls-files','--others','-z');
       rmtree(split(/\0/,$rm)) if $rm;
    }

    # Apply the import/changeset/merge into the working tree
    my $dir = sync_to_ps($ps);
    # read the new log entry:
    my @commitlog = safe_pipe_capture($TLA,'cat-log','-d',$dir,$ps->{id});
    die "Error in cat-log: $!" if $?;
    chomp @commitlog;

    # grab variables we want from the log, new fields get added to $ps:
    # (author, date, email, summary, message body ...)
    parselog($ps, \@commitlog);

    if ($ps->{id} =~ /--base-0$/ && $ps->{id} ne $psets[0]{id}) {
        # this should work when importing continuations
        if ($ps->{tag} && (my $branchpoint = eval { ptag($ps->{tag}) })) {

            # find where we are supposed to branch from
if (! -e "$git_dir/refs/heads/$ps->{branch}") {
system('git-branch',$ps->{branch},$branchpoint) == 0 or die "$! $?\n";

# We trust Arch with the fact that this is just a tag,
# and it does not affect the state of the tree, so
# we just tag and move on. If the user really wants us
# to consolidate more branches into one, don't tag because
# the tag name would be already taken.
tag($ps->{id}, $branchpoint);
ptag($ps->{id}, $branchpoint);
print " * Tagged $ps->{id} at $branchpoint\n";
}
system('git-checkout','-f',$ps->{branch}) == 0 or die "$! $?\n";

            # remove any old stuff that got leftover:
            my $rm = safe_pipe_capture('git-ls-files','--others','-z');
            rmtree(split(/\0/,$rm)) if $rm;
            return 0;
        } else {
            warn "Tagging from unknown id unsupported\n" if $ps->{tag};
        }
        # allow multiple bases/imports here since Arch supports cherry-picks
        # from unrelated trees
    }

    # update the index with all the changes we got
    system('git-diff-files --name-only -z | '.
            'git-update-index --remove -z --stdin') == 0 or die "$! $?\n";
    system('git-ls-files --others -z | '.
            'git-update-index --add -z --stdin') == 0 or die "$! $?\n";
    return 1;
}

# the native changeset processing strategy. This is very fast, but
# does not handle permissions or any renames involving directories
sub process_patchset_fast {
    my $ps = shift;
    #
    # create the branch if needed
    #
    if ($ps->{type} eq 'i' && !$import) {
        die "Should not have more than one 'Initial import' per GIT import: $ps->{id}";
    }

    unless ($import) { # skip for import
        if ( -e "$git_dir/refs/heads/$ps->{branch}") {
            # we know about this branch
            system('git-checkout',$ps->{branch});
        } else {
            # new branch! we need to verify a few things
            die "Branch on a non-tag!" unless $ps->{type} eq 't';
            my $branchpoint = ptag($ps->{tag});
            die "Tagging from unknown id unsupported: $ps->{tag}"
                unless $branchpoint;

            # find where we are supposed to branch from
if (! -e "$git_dir/refs/heads/$ps->{branch}") {
system('git-branch',$ps->{branch},$branchpoint) == 0 or die "$! $?\n";

# We trust Arch with the fact that this is just a tag,
# and it does not affect the state of the tree, so
# we just tag and move on. If the user really wants us
# to consolidate more branches into one, don't tag because
# the tag name would be already taken.
tag($ps->{id}, $branchpoint);
ptag($ps->{id}, $branchpoint);
print " * Tagged $ps->{id} at $branchpoint\n";
            }
            system('git-checkout',$ps->{branch}) == 0 or die "$! $?\n";
            return 0;
        }
        die $! if $?;
    }

    #
    # Apply the import/changeset/merge into the working tree
    #
    if ($ps->{type} eq 'i' || $ps->{type} eq 't') {
        apply_import($ps) or die $!;
        $stats{import_or_tag}++;
        $import=0;
    } elsif ($ps->{type} eq 's') {
        apply_cset($ps);
        $stats{simple_changeset}++;
    }

    #
    # prepare update git's index, based on what arch knows
    # about the pset, resolve parents, etc
    #

    my @commitlog = safe_pipe_capture($TLA,'cat-archive-log',$ps->{id});
    die "Error in cat-archive-log: $!" if $?;

    parselog($ps,\@commitlog);

    # imports don't give us good info
    # on added files. Shame on them
    if ($ps->{type} eq 'i' || $ps->{type} eq 't') {
        system('git-ls-files --deleted -z | '.
                'git-update-index --remove -z --stdin') == 0 or die "$! $?\n";
        system('git-ls-files --others -z | '.
                'git-update-index --add -z --stdin') == 0 or die "$! $?\n";
    }

    # TODO: handle removed_directories and renamed_directories:

    if (my $del = $ps->{removed_files}) {
        unlink @$del;
        while (@$del) {
            my @slice = splice(@$del, 0, 100);
            system('git-update-index','--remove','--',@slice) == 0 or
                            die "Error in git-update-index --remove: $! $?\n";
        }
    }

    if (my $ren = $ps->{renamed_files}) { # renamed
        if (@$ren % 2) {
            die "Odd number of entries in rename!?";
        }

        while (@$ren) {
            my $from = shift @$ren;
            my $to = shift @$ren;

            unless (-d dirname($to)) {
                mkpath(dirname($to)); # will die on err
            }
            # print "moving $from $to";
            rename($from, $to) or die "Error renaming '$from' '$to': $!\n";
            system('git-update-index','--remove','--',$from) == 0 or
                            die "Error in git-update-index --remove: $! $?\n";
            system('git-update-index','--add','--',$to) == 0 or
                            die "Error in git-update-index --add: $! $?\n";
        }
    }

    if (my $add = $ps->{new_files}) {
        while (@$add) {
            my @slice = splice(@$add, 0, 100);
            system('git-update-index','--add','--',@slice) == 0 or
                            die "Error in git-update-index --add: $! $?\n";
        }
    }

    if (my $mod = $ps->{modified_files}) {
        while (@$mod) {
            my @slice = splice(@$mod, 0, 100);
            system('git-update-index','--',@slice) == 0 or
                            die "Error in git-update-index: $! $?\n";
        }
    }
    return 1; # we successfully applied the changeset
}

if ($opt_f) {
    print "Will import patchsets using the fast strategy\n",
            "Renamed directories and permission changes will be missed\n";
    *process_patchset = *process_patchset_fast;
} else {
    print "Using the default (accurate) import strategy.\n",
            "Things may be a bit slow\n";
    *process_patchset = *process_patchset_accurate;
}

foreach my $ps (@psets) {
    # process patchsets
    $ps->{branch} = git_branchname($ps->{id});

    #
    # ensure we have a clean state
    #
    if (my $dirty = `git-diff-files`) {
        die "Unclean tree when about to process $ps->{id} " .
            " - did we fail to commit cleanly before?\n$dirty";
    }
    die $! if $?;

    #
    # skip commits already in repo
    #
    if (ptag($ps->{id})) {
      $opt_v && print " * Skipping already imported: $ps->{id}\n";
      next;
    }

    print " * Starting to work on $ps->{id}\n";

    process_patchset($ps) or next;

    # warn "errors when running git-update-index! $!";
    my $tree = `git-write-tree`;
    die "cannot write tree $!" if $?;
    chomp $tree;

    #
    # Who's your daddy?
    #
    my @par;
    if ( -e "$git_dir/refs/heads/$ps->{branch}") {
        if (open HEAD, "<","$git_dir/refs/heads/$ps->{branch}") {
            my $p = <HEAD>;
            close HEAD;
            chomp $p;
            push @par, '-p', $p;
        } else {
            if ($ps->{type} eq 's') {
                warn "Could not find the right head for the branch $ps->{branch}";
            }
        }
    }

    if ($ps->{merges}) {
        push @par, find_parents($ps);
    }

    #
    # Commit, tag and clean state
    #
    $ENV{TZ} = 'GMT';
    $ENV{GIT_AUTHOR_NAME} = $ps->{author};
    $ENV{GIT_AUTHOR_EMAIL} = $ps->{email};
    $ENV{GIT_AUTHOR_DATE} = $ps->{date};
    $ENV{GIT_COMMITTER_NAME} = $ps->{author};
    $ENV{GIT_COMMITTER_EMAIL} = $ps->{email};
    $ENV{GIT_COMMITTER_DATE} = $ps->{date};

    my $pid = open2(*READER, *WRITER,'git-commit-tree',$tree,@par)
        or die $!;
    print WRITER $ps->{summary},"\n\n";

    # only print message if it's not empty, to avoid a spurious blank line;
    # also append an extra newline, so there's a blank line before the
    # following "git-archimport-id:" line.
    print WRITER $ps->{message},"\n\n" if ($ps->{message} ne "");

    # make it easy to backtrack and figure out which Arch revision this was:
    print WRITER 'git-archimport-id: ',$ps->{id},"\n";

    close WRITER;
    my $commitid = <READER>; # read
    chomp $commitid;
    close READER;
    waitpid $pid,0; # close;

    if (length $commitid != 40) {
        die "Something went wrong with the commit! $! $commitid";
    }
    #
    # Update the branch
    #
    open HEAD, ">","$git_dir/refs/heads/$ps->{branch}";
    print HEAD $commitid;
    close HEAD;
    system('git-update-ref', 'HEAD', "$ps->{branch}");

    # tag accordingly
    ptag($ps->{id}, $commitid); # private tag
    if ($opt_T || $ps->{type} eq 't' || $ps->{type} eq 'i') {
        tag($ps->{id}, $commitid);
    }
    print " * Committed $ps->{id}\n";
    print " + tree $tree\n";
    print " + commit $commitid\n";
    $opt_v && print " + commit date is $ps->{date} \n";
    $opt_v && print " + parents: ",join(' ',@par),"\n";
}

if ($opt_v) {
    foreach (sort keys %stats) {
        print" $_: $stats{$_}\n";
    }
}
exit 0;

# used by the accurate strategy:
sub sync_to_ps {
    my $ps = shift;
    my $tree_dir = $tmp.'/'.tree_dirname($ps->{id});

    $opt_v && print "sync_to_ps($ps->{id}) method: ";

    if (-d $tree_dir) {
        if ($ps->{type} eq 't') {
$opt_v && print "get (tag)\n";
            # looks like a tag-only or (worse,) a mixed tags/changeset branch,
            # can't rely on replay to work correctly on these
            rmtree($tree_dir);
            safe_pipe_capture($TLA,'get','--no-pristine',$ps->{id},$tree_dir);
            $stats{get_tag}++;
        } else {
                my $tree_id = arch_tree_id($tree_dir);
                if ($ps->{parent_id} && ($ps->{parent_id} eq $tree_id)) {
                    # the common case (hopefully)
$opt_v && print "replay\n";
                    safe_pipe_capture($TLA,'replay','-d',$tree_dir,$ps->{id});
                    $stats{replay}++;
                } else {
                    # getting one tree is usually faster than getting two trees
                    # and applying the delta ...
                    rmtree($tree_dir);
$opt_v && print "apply-delta\n";
                    safe_pipe_capture($TLA,'get','--no-pristine',
                                        $ps->{id},$tree_dir);
                    $stats{get_delta}++;
                }
        }
    } else {
        # new branch work
        $opt_v && print "get (new tree)\n";
        safe_pipe_capture($TLA,'get','--no-pristine',$ps->{id},$tree_dir);
        $stats{get_new}++;
    }

    # added -I flag to rsync since we're going to fast! AIEEEEE!!!!
    system('rsync','-aI','--delete','--exclude',$git_dir,
# '--exclude','.arch-inventory',
                '--exclude','.arch-ids','--exclude','{arch}',
                '--exclude','+*','--exclude',',*',
                "$tree_dir/",'./') == 0 or die "Cannot rsync $tree_dir: $! $?";
    return $tree_dir;
}

sub apply_import {
    my $ps = shift;
    my $bname = git_branchname($ps->{id});

    mkpath($tmp);

    safe_pipe_capture($TLA,'get','-s','--no-pristine',$ps->{id},"$tmp/import");
    die "Cannot get import: $!" if $?;
    system('rsync','-aI','--delete', '--exclude',$git_dir,
'--exclude','.arch-ids','--exclude','{arch}',
"$tmp/import/", './');
    die "Cannot rsync import:$!" if $?;

    rmtree("$tmp/import");
    die "Cannot remove tempdir: $!" if $?;


    return 1;
}

sub apply_cset {
    my $ps = shift;

    mkpath($tmp);

    # get the changeset
    safe_pipe_capture($TLA,'get-changeset',$ps->{id},"$tmp/changeset");
    die "Cannot get changeset: $!" if $?;

    # apply patches
    if (`find $tmp/changeset/patches -type f -name '*.patch'`) {
        # this can be sped up considerably by doing
        # (find | xargs cat) | patch
        # but that can get mucked up by patches
        # with missing trailing newlines or the standard
        # 'missing newline' flag in the patch - possibly
        # produced with an old/buggy diff.
        # slow and safe, we invoke patch once per patchfile
        `find $tmp/changeset/patches -type f -name '*.patch' -print0 | grep -zv '{arch}' | xargs -iFILE -0 --no-run-if-empty patch -p1 --forward -iFILE`;
        die "Problem applying patches! $!" if $?;
    }

    # apply changed binary files
    if (my @modified = `find $tmp/changeset/patches -type f -name '*.modified'`) {
        foreach my $mod (@modified) {
            chomp $mod;
            my $orig = $mod;
            $orig =~ s/\.modified$//; # lazy
            $orig =~ s!^\Q$tmp\E/changeset/patches/!!;
            #print "rsync -p '$mod' '$orig'";
            system('rsync','-p',$mod,"./$orig");
            die "Problem applying binary changes! $!" if $?;
        }
    }

    # bring in new files
    system('rsync','-aI','--exclude',$git_dir,
'--exclude','.arch-ids',
'--exclude', '{arch}',
"$tmp/changeset/new-files-archive/",'./');

    # deleted files are hinted from the commitlog processing

    rmtree("$tmp/changeset");
}


# =for reference
# notes: *-files/-directories keys cannot have spaces, they're always
# pika-escaped. Everything after the first newline
# A log entry looks like:
# Revision: moodle-org--moodle--1.3.3--patch-15
# Archive: arch-eduforge@catalyst.net.nz--2004
# Creator: Penny Leach <penny@catalyst.net.nz>
# Date: Wed May 25 14:15:34 NZST 2005
# Standard-date: 2005-05-25 02:15:34 GMT
# New-files: lang/de/.arch-ids/block_glossary_random.php.id
# lang/de/.arch-ids/block_html.php.id
# New-directories: lang/de/help/questionnaire
# lang/de/help/questionnaire/.arch-ids
# Renamed-files: .arch-ids/db_sears.sql.id db/.arch-ids/db_sears.sql.id
# db_sears.sql db/db_sears.sql
# Removed-files: lang/be/docs/.arch-ids/release.html.id
# lang/be/docs/.arch-ids/releaseold.html.id
# Modified-files: admin/cron.php admin/delete.php
# admin/editor.html backup/lib.php backup/restore.php
# New-patches: arch-eduforge@catalyst.net.nz--2004/moodle-org--moodle--1.3.3--patch-15
# Summary: Updating to latest from MOODLE_14_STABLE (1.4.5+)
# summary can be multiline with a leading space just like the above fields
# Keywords:
#
# Updating yadda tadda tadda madda
sub parselog {
    my ($ps, $log) = @_;
    my $key = undef;

    # headers we want that contain filenames:
    my %want_headers = (
        new_files => 1,
        modified_files => 1,
        renamed_files => 1,
        renamed_directories => 1,
        removed_files => 1,
        removed_directories => 1,
    );

    chomp (@$log);
    while ($_ = shift @$log) {
        if (/^Continuation-of:\s*(.*)/) {
            $ps->{tag} = $1;
            $key = undef;
        } elsif (/^Summary:\s*(.*)$/ ) {
            # summary can be multiline as long as it has a leading space.
# we squeeze it onto a single line, though.
            $ps->{summary} = [ $1 ];
            $key = 'summary';
        } elsif (/^Creator: (.*)\s*<([^\>]+)>/) {
            $ps->{author} = $1;
            $ps->{email} = $2;
            $key = undef;
        # any *-files or *-directories can be read here:
        } elsif (/^([A-Z][a-z\-]+):\s*(.*)$/) {
            my $val = $2;
            $key = lc $1;
            $key =~ tr/-/_/; # too lazy to quote :P
            if ($want_headers{$key}) {
                push @{$ps->{$key}}, split(/\s+/, $val);
            } else {
                $key = undef;
            }
        } elsif (/^$/) {
            last; # remainder of @$log that didn't get shifted off is message
        } elsif ($key) {
            if (/^\s+(.*)$/) {
                if ($key eq 'summary') {
                    push @{$ps->{$key}}, $1;
                } else { # files/directories:
                    push @{$ps->{$key}}, split(/\s+/, $1);
                }
            } else {
                $key = undef;
            }
        }
    }

    # drop leading empty lines from the log message
    while (@$log && $log->[0] eq '') {
shift @$log;
    }
    if (exists $ps->{summary} && @{$ps->{summary}}) {
$ps->{summary} = join(' ', @{$ps->{summary}});
    }
    elsif (@$log == 0) {
$ps->{summary} = 'empty commit message';
    } else {
$ps->{summary} = $log->[0] . '...';
    }
    $ps->{message} = join("\n",@$log);

    # skip Arch control files, unescape pika-escaped files
    foreach my $k (keys %want_headers) {
        next unless (defined $ps->{$k});
        my @tmp = ();
        foreach my $t (@{$ps->{$k}}) {
           next unless length ($t);
           next if $t =~ m!\{arch\}/!;
           next if $t =~ m!\.arch-ids/!;
           # should we skip this?
           next if $t =~ m!\.arch-inventory$!;
           # tla cat-archive-log will give us filenames with spaces as file\(sp)name - why?
           # we can assume that any filename with \ indicates some pika escaping that we want to get rid of.
           if ($t =~ /\\/ ){
               $t = (safe_pipe_capture($TLA,'escape','--unescaped',$t))[0];
           }
           push @tmp, $t;
        }
        $ps->{$k} = \@tmp;
    }
}

# write/read a tag
sub tag {
    my ($tag, $commit) = @_;

    if ($opt_o) {
        $tag =~ s|/|--|g;
    } else {
my $patchname = $tag;
$patchname =~ s/.*--//;
        $tag = git_branchname ($tag) . '--' . $patchname;
    }

    if ($commit) {
        open(C,">","$git_dir/refs/tags/$tag")
            or die "Cannot create tag $tag: $!\n";
        print C "$commit\n"
            or die "Cannot write tag $tag: $!\n";
        close(C)
            or die "Cannot write tag $tag: $!\n";
        print " * Created tag '$tag' on '$commit'\n" if $opt_v;
    } else { # read
        open(C,"<","$git_dir/refs/tags/$tag")
            or die "Cannot read tag $tag: $!\n";
        $commit = <C>;
        chomp $commit;
        die "Error reading tag $tag: $!\n" unless length $commit == 40;
        close(C)
            or die "Cannot read tag $tag: $!\n";
        return $commit;
    }
}

# write/read a private tag
# reads fail softly if the tag isn't there
sub ptag {
    my ($tag, $commit) = @_;

    # don't use subdirs for tags yet, it could screw up other porcelains
    $tag =~ s|/|,|g;

    my $tag_file = "$ptag_dir/$tag";
    my $tag_branch_dir = dirname($tag_file);
    mkpath($tag_branch_dir) unless (-d $tag_branch_dir);

    if ($commit) { # write
        open(C,">",$tag_file)
            or die "Cannot create tag $tag: $!\n";
        print C "$commit\n"
            or die "Cannot write tag $tag: $!\n";
        close(C)
            or die "Cannot write tag $tag: $!\n";
$rptags{$commit} = $tag
unless $tag =~ m/--base-0$/;
    } else { # read
        # if the tag isn't there, return 0
        unless ( -s $tag_file) {
            return 0;
        }
        open(C,"<",$tag_file)
            or die "Cannot read tag $tag: $!\n";
        $commit = <C>;
        chomp $commit;
        die "Error reading tag $tag: $!\n" unless length $commit == 40;
        close(C)
            or die "Cannot read tag $tag: $!\n";
unless (defined $rptags{$commit}) {
$rptags{$commit} = $tag;
}
        return $commit;
    }
}

sub find_parents {
    #
    # Identify what branches are merging into me
    # and whether we are fully merged
    # git-merge-base <headsha> <headsha> should tell
    # me what the base of the merge should be
    #
    my $ps = shift;

    my %branches; # holds an arrayref per branch
                  # the arrayref contains a list of
                  # merged patches between the base
                  # of the merge and the current head

    my @parents; # parents found for this commit

    # simple loop to split the merges
    # per branch
    foreach my $merge (@{$ps->{merges}}) {
my $branch = git_branchname($merge);
unless (defined $branches{$branch} ){
$branches{$branch} = [];
}
push @{$branches{$branch}}, $merge;
    }

    #
    # foreach branch find a merge base and walk it to the
    # head where we are, collecting the merged patchsets that
    # Arch has recorded. Keep that in @have
    # Compare that with the commits on the other branch
    # between merge-base and the tip of the branch (@need)
    # and see if we have a series of consecutive patches
    # starting from the merge base. The tip of the series
    # of consecutive patches merged is our new parent for
    # that branch.
    #
    foreach my $branch (keys %branches) {

# check that we actually know about the branch
next unless -e "$git_dir/refs/heads/$branch";

my $mergebase = `git-merge-base $branch $ps->{branch}`;
if ($?) {
# Don't die here, Arch supports one-way cherry-picking
# between branches with no common base (or any relationship
# at all beforehand)
warn "Cannot find merge base for $branch and $ps->{branch}";
next;
}
chomp $mergebase;

# now walk up to the mergepoint collecting what patches we have
my $branchtip = git_rev_parse($ps->{branch});
my @ancestors = `git-rev-list --topo-order $branchtip ^$mergebase`;
my %have; # collected merges this branch has
foreach my $merge (@{$ps->{merges}}) {
$have{$merge} = 1;
}
my %ancestorshave;
foreach my $par (@ancestors) {
$par = commitid2pset($par);
if (defined $par->{merges}) {
foreach my $merge (@{$par->{merges}}) {
$ancestorshave{$merge}=1;
}
}
}
# print "++++ Merges in $ps->{id} are....\n";
# my @have = sort keys %have; print Dumper(\@have);

# merge what we have with what ancestors have
%have = (%have, %ancestorshave);

# see what the remote branch has - these are the merges we
# will want to have in a consecutive series from the mergebase
my $otherbranchtip = git_rev_parse($branch);
my @needraw = `git-rev-list --topo-order $otherbranchtip ^$mergebase`;
my @need;
foreach my $needps (@needraw) { # get the psets
$needps = commitid2pset($needps);
# git-rev-list will also
# list commits merged in via earlier
# merges. we are only interested in commits
# from the branch we're looking at
if ($branch eq $needps->{branch}) {
push @need, $needps->{id};
}
}

# print "++++ Merges from $branch we want are....\n";
# print Dumper(\@need);

my $newparent;
while (my $needed_commit = pop @need) {
if ($have{$needed_commit}) {
$newparent = $needed_commit;
} else {
last; # break out of the while
}
}
if ($newparent) {
push @parents, $newparent;
}


    } # end foreach branch

    # prune redundant parents
    my %parents;
    foreach my $p (@parents) {
$parents{$p} = 1;
    }
    foreach my $p (@parents) {
next unless exists $psets{$p}{merges};
next unless ref $psets{$p}{merges};
my @merges = @{$psets{$p}{merges}};
foreach my $merge (@merges) {
if ($parents{$merge}) {
delete $parents{$merge};
}
}
    }

    @parents = ();
    foreach (keys %parents) {
        push @parents, '-p', ptag($_);
    }
    return @parents;
}

sub git_rev_parse {
    my $name = shift;
    my $val = `git-rev-parse $name`;
    die "Error: git-rev-parse $name" if $?;
    chomp $val;
    return $val;
}

# resolve a SHA1 to a known patchset
sub commitid2pset {
    my $commitid = shift;
    chomp $commitid;
    my $name = $rptags{$commitid}
|| die "Cannot find reverse tag mapping for $commitid";
    $name =~ s|,|/|;
    my $ps = $psets{$name}
|| (print Dumper(sort keys %psets)) && die "Cannot find patchset for $name";
    return $ps;
}


# an alternative to `command` that allows input to be passed as an array
# to work around shell problems with weird characters in arguments
sub safe_pipe_capture {
    my @output;
    if (my $pid = open my $child, '-|') {
        @output = (<$child>);
        close $child or die join(' ',@_).": $! $?";
    } else {
exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
    }
    return wantarray ? @output : join('',@output);
}

# `tla logs -rf -d <dir> | head -n1` or `baz tree-id <dir>`
sub arch_tree_id {
    my $dir = shift;
    chomp( my $ret = (safe_pipe_capture($TLA,'logs','-rf','-d',$dir))[0] );
    return $ret;
}

sub archive_reachable {
    my $archive = shift;
    return 1 if $reachable{$archive};
    return 0 if $unreachable{$archive};

    if (system "$TLA whereis-archive $archive >/dev/null") {
        if ($opt_a && (system($TLA,'register-archive',
                      "http://mirrors.sourcecontrol.net/$archive") == 0)) {
            $reachable{$archive} = 1;
            return 1;
        }
        print STDERR "Archive is unreachable: $archive\n";
        $unreachable{$archive} = 1;
        return 0;
    } else {
        $reachable{$archive} = 1;
        return 1;
    }
}
Something went wrong with that request. Please try again.