5f23d6b228d56db039569062b0aa05dff7eed4cd
1#!/usr/bin/env perl
2use warnings;
3use strict;
4use vars qw/ $AUTHOR $VERSION
5 $SVN_URL $SVN_INFO $SVN_WC
6 $GIT_SVN_INDEX $GIT_SVN
7 $GIT_DIR $REV_DIR/;
8$AUTHOR = 'Eric Wong <normalperson@yhbt.net>';
9$VERSION = '0.9.0';
10$GIT_DIR = $ENV{GIT_DIR} || "$ENV{PWD}/.git";
11$GIT_SVN = $ENV{GIT_SVN_ID} || 'git-svn';
12$GIT_SVN_INDEX = "$GIT_DIR/$GIT_SVN/index";
13$ENV{GIT_DIR} ||= $GIT_DIR;
14$SVN_URL = undef;
15$REV_DIR = "$GIT_DIR/$GIT_SVN/revs";
16$SVN_WC = "$GIT_DIR/$GIT_SVN/tree";
17# make sure the svn binary gives consistent output between locales and TZs:
19$ENV{TZ} = 'UTC';
20$ENV{LC_ALL} = 'C';
21# If SVN:: library support is added, please make the dependencies
23# optional and preserve the capability to use the command-line client.
24# See what I do with XML::Simple to make the dependency optional.
25use Carp qw/croak/;
26use IO::File qw//;
27use File::Basename qw/dirname basename/;
28use File::Path qw/mkpath/;
29use Getopt::Long qw/:config gnu_getopt no_ignore_case auto_abbrev/;
30use File::Spec qw//;
31my $sha1 = qr/[a-f\d]{40}/;
32my $sha1_short = qr/[a-f\d]{6,40}/;
33my ($_revision,$_stdin,$_no_ignore_ext,$_no_stop_copy,$_help,$_rmdir,$_edit,
34 $_find_copies_harder, $_l);
35GetOptions( 'revision|r=s' => \$_revision,
37 'no-ignore-externals' => \$_no_ignore_ext,
38 'stdin|' => \$_stdin,
39 'edit|e' => \$_edit,
40 'rmdir' => \$_rmdir,
41 'help|H|h' => \$_help,
42 'find-copies-harder' => \$_find_copies_harder,
43 'l=i' => \$_l,
44 'no-stop-on-copy' => \$_no_stop_copy );
45my %cmd = (
46 fetch => [ \&fetch, "Download new revisions from SVN" ],
47 init => [ \&init, "Initialize and fetch (import)"],
48 commit => [ \&commit, "Commit git revisions to SVN" ],
49 rebuild => [ \&rebuild, "Rebuild git-svn metadata (after git clone)" ],
50 help => [ \&usage, "Show help" ],
51);
52my $cmd;
53for (my $i = 0; $i < @ARGV; $i++) {
54 if (defined $cmd{$ARGV[$i]}) {
55 $cmd = $ARGV[$i];
56 splice @ARGV, $i, 1;
57 last;
58 }
59};
60# we may be called as git-svn-(command), or git-svn(command).
62foreach (keys %cmd) {
63 if (/git\-svn\-?($_)(?:\.\w+)?$/) {
64 $cmd = $1;
65 last;
66 }
67}
68usage(0) if $_help;
69usage(1) unless (defined $cmd);
70svn_check_ignore_externals();
71$cmd{$cmd}->[0]->(@ARGV);
72exit 0;
73####################### primary functions ######################
75sub usage {
76 my $exit = shift || 0;
77 my $fd = $exit ? \*STDERR : \*STDOUT;
78 print $fd <<"";
79git-svn - bidirectional operations between a single Subversion tree and git
80Usage: $0 <command> [options] [arguments]\n
81Available commands:
82 foreach (sort keys %cmd) {
84 print $fd ' ',pack('A10',$_),$cmd{$_}->[1],"\n";
85 }
86 print $fd <<"";
87\nGIT_SVN_ID may be set in the environment to an arbitrary identifier if
88you're tracking multiple SVN branches/repositories in one git repository
89and want to keep them separate.
90 exit $exit;
92}
93sub rebuild {
95 $SVN_URL = shift or undef;
96 my $repo_uuid;
97 my $newest_rev = 0;
98 my $pid = open(my $rev_list,'-|');
100 defined $pid or croak $!;
101 if ($pid == 0) {
102 exec("git-rev-list","$GIT_SVN-HEAD") or croak $!;
103 }
104 my $first;
105 while (<$rev_list>) {
106 chomp;
107 my $c = $_;
108 croak "Non-SHA1: $c\n" unless $c =~ /^$sha1$/o;
109 my @commit = grep(/^git-svn-id: /,`git-cat-file commit $c`);
110 next if (!@commit); # skip merges
111 my $id = $commit[$#commit];
112 my ($url, $rev, $uuid) = ($id =~ /^git-svn-id:\s(\S+?)\@(\d+)
113 \s([a-f\d\-]+)$/x);
114 if (!$rev || !$uuid || !$url) {
115 # some of the original repositories I made had
116 # indentifiers like this:
117 ($rev, $uuid) = ($id =~/^git-svn-id:\s(\d+)
118 \@([a-f\d\-]+)/x);
119 if (!$rev || !$uuid) {
120 croak "Unable to extract revision or UUID from ",
121 "$c, $id\n";
122 }
123 }
124 print "r$rev = $c\n";
125 unless (defined $first) {
126 if (!$SVN_URL && !$url) {
127 croak "SVN repository location required: $url\n";
128 }
129 $SVN_URL ||= $url;
130 $repo_uuid = setup_git_svn();
131 $first = $rev;
132 }
133 if ($uuid ne $repo_uuid) {
134 croak "Repository UUIDs do not match!\ngot: $uuid\n",
135 "expected: $repo_uuid\n";
136 }
137 assert_revision_eq_or_unknown($rev, $c);
138 sys('git-update-ref',"$GIT_SVN/revs/$rev",$c);
139 $newest_rev = $rev if ($rev > $newest_rev);
140 }
141 close $rev_list or croak $?;
142 if (!chdir $SVN_WC) {
143 my @svn_co = ('svn','co',"-r$first");
144 push @svn_co, '--ignore-externals' unless $_no_ignore_ext;
145 sys(@svn_co, $SVN_URL, $SVN_WC);
146 chdir $SVN_WC or croak $!;
147 }
148 $pid = fork;
150 defined $pid or croak $!;
151 if ($pid == 0) {
152 my @svn_up = qw(svn up);
153 push @svn_up, '--ignore-externals' unless $_no_ignore_ext;
154 sys(@svn_up,"-r$newest_rev");
155 $ENV{GIT_INDEX_FILE} = $GIT_SVN_INDEX;
156 git_addremove();
157 exec('git-write-tree');
158 }
159 waitpid $pid, 0;
160}
161sub init {
163 $SVN_URL = shift or croak "SVN repository location required\n";
164 unless (-d $GIT_DIR) {
165 sys('git-init-db');
166 }
167 setup_git_svn();
168}
169sub fetch {
171 my (@parents) = @_;
172 $SVN_URL ||= file_to_s("$GIT_DIR/$GIT_SVN/info/url");
173 my @log_args = -d $SVN_WC ? ($SVN_WC) : ($SVN_URL);
174 unless ($_revision) {
175 $_revision = -d $SVN_WC ? 'BASE:HEAD' : '0:HEAD';
176 }
177 push @log_args, "-r$_revision";
178 push @log_args, '--stop-on-copy' unless $_no_stop_copy;
179 eval { require XML::Simple or croak $! };
181 my $svn_log = $@ ? svn_log_raw(@log_args) : svn_log_xml(@log_args);
182 @$svn_log = sort { $a->{revision} <=> $b->{revision} } @$svn_log;
183 my $base = shift @$svn_log or croak "No base revision!\n";
185 my $last_commit = undef;
186 unless (-d $SVN_WC) {
187 my @svn_co = ('svn','co',"-r$base->{revision}");
188 push @svn_co,'--ignore-externals' unless $_no_ignore_ext;
189 sys(@svn_co, $SVN_URL, $SVN_WC);
190 chdir $SVN_WC or croak $!;
191 $last_commit = git_commit($base, @parents);
192 unless (-f "$GIT_DIR/refs/heads/master") {
193 sys(qw(git-update-ref refs/heads/master),$last_commit);
194 }
195 assert_svn_wc_clean($base->{revision}, $last_commit);
196 } else {
197 chdir $SVN_WC or croak $!;
198 $last_commit = file_to_s("$REV_DIR/$base->{revision}");
199 }
200 my @svn_up = qw(svn up);
201 push @svn_up, '--ignore-externals' unless $_no_ignore_ext;
202 my $last_rev = $base->{revision};
203 foreach my $log_msg (@$svn_log) {
204 assert_svn_wc_clean($last_rev, $last_commit);
205 $last_rev = $log_msg->{revision};
206 sys(@svn_up,"-r$last_rev");
207 $last_commit = git_commit($log_msg, $last_commit, @parents);
208 }
209 assert_svn_wc_clean($last_rev, $last_commit);
210 return pop @$svn_log;
211}
212sub commit {
214 my (@commits) = @_;
215 if ($_stdin || !@commits) {
216 print "Reading from stdin...\n";
217 @commits = ();
218 while (<STDIN>) {
219 if (/\b([a-f\d]{6,40})\b/) {
220 unshift @commits, $1;
221 }
222 }
223 }
224 my @revs;
225 foreach my $c (@commits) {
226 chomp(my @tmp = safe_qx('git-rev-parse',$c));
227 if (scalar @tmp == 1) {
228 push @revs, $tmp[0];
229 } elsif (scalar @tmp > 1) {
230 push @revs, reverse (safe_qx('git-rev-list',@tmp));
231 } else {
232 die "Failed to rev-parse $c\n";
233 }
234 }
235 chomp @revs;
236 fetch();
238 chdir $SVN_WC or croak $!;
239 my $svn_current_rev = svn_info('.')->{'Last Changed Rev'};
240 foreach my $c (@revs) {
241 print "Committing $c\n";
242 svn_checkout_tree($svn_current_rev, $c);
243 $svn_current_rev = svn_commit_tree($svn_current_rev, $c);
244 }
245 print "Done committing ",scalar @revs," revisions to SVN\n";
246}
248########################### utility functions #########################
250sub setup_git_svn {
252 defined $SVN_URL or croak "SVN repository location required\n";
253 unless (-d $GIT_DIR) {
254 croak "GIT_DIR=$GIT_DIR does not exist!\n";
255 }
256 mkpath(["$GIT_DIR/$GIT_SVN"]);
257 mkpath(["$GIT_DIR/$GIT_SVN/info"]);
258 mkpath([$REV_DIR]);
259 s_to_file($SVN_URL,"$GIT_DIR/$GIT_SVN/info/url");
260 my $uuid = svn_info($SVN_URL)->{'Repository UUID'} or
261 croak "Repository UUID unreadable\n";
262 s_to_file($uuid,"$GIT_DIR/$GIT_SVN/info/uuid");
263 open my $fd, '>>', "$GIT_DIR/$GIT_SVN/info/exclude" or croak $!;
265 print $fd '.svn',"\n";
266 close $fd or croak $!;
267 return $uuid;
268}
269sub assert_svn_wc_clean {
271 my ($svn_rev, $commit) = @_;
272 croak "$svn_rev is not an integer!\n" unless ($svn_rev =~ /^\d+$/);
273 croak "$commit is not a sha1!\n" unless ($commit =~ /^$sha1$/o);
274 my $svn_info = svn_info('.');
275 if ($svn_rev != $svn_info->{'Last Changed Rev'}) {
276 croak "Expected r$svn_rev, got r",
277 $svn_info->{'Last Changed Rev'},"\n";
278 }
279 my @status = grep(!/^Performing status on external/,(`svn status`));
280 @status = grep(!/^\s*$/,@status);
281 if (scalar @status) {
282 print STDERR "Tree ($SVN_WC) is not clean:\n";
283 print STDERR $_ foreach @status;
284 croak;
285 }
286 my ($tree_a) = grep(/^tree $sha1$/o,`git-cat-file commit $commit`);
287 $tree_a =~ s/^tree //;
288 chomp $tree_a;
289 chomp(my $tree_b = `GIT_INDEX_FILE=$GIT_SVN_INDEX git-write-tree`);
290 if ($tree_a ne $tree_b) {
291 croak "$svn_rev != $commit, $tree_a != $tree_b\n";
292 }
293}
294sub parse_diff_tree {
296 my $diff_fh = shift;
297 local $/ = "\0";
298 my $state = 'meta';
299 my @mods;
300 while (<$diff_fh>) {
301 chomp $_; # this gets rid of the trailing "\0"
302 print $_,"\n";
303 if ($state eq 'meta' && /^:(\d{6})\s(\d{6})\s
304 $sha1\s($sha1)\s([MTCRAD])\d*$/xo) {
305 push @mods, { mode_a => $1, mode_b => $2,
306 sha1_b => $3, chg => $4 };
307 if ($4 =~ /^(?:C|R)$/) {
308 $state = 'file_a';
309 } else {
310 $state = 'file_b';
311 }
312 } elsif ($state eq 'file_a') {
313 my $x = $mods[$#mods] or croak __LINE__,": Empty array\n";
314 if ($x->{chg} !~ /^(?:C|R)$/) {
315 croak __LINE__,": Error parsing $_, $x->{chg}\n";
316 }
317 $x->{file_a} = $_;
318 $state = 'file_b';
319 } elsif ($state eq 'file_b') {
320 my $x = $mods[$#mods] or croak __LINE__,": Empty array\n";
321 if (exists $x->{file_a} && $x->{chg} !~ /^(?:C|R)$/) {
322 croak __LINE__,": Error parsing $_, $x->{chg}\n";
323 }
324 if (!exists $x->{file_a} && $x->{chg} =~ /^(?:C|R)$/) {
325 croak __LINE__,": Error parsing $_, $x->{chg}\n";
326 }
327 $x->{file_b} = $_;
328 $state = 'meta';
329 } else {
330 croak __LINE__,": Error parsing $_\n";
331 }
332 }
333 close $diff_fh or croak $!;
334 return \@mods;
335}
336sub svn_check_prop_executable {
338 my $m = shift;
339 if ($m->{mode_b} =~ /755$/ && $m->{mode_a} !~ /755$/) {
340 sys(qw(svn propset svn:executable 1), $m->{file_b});
341 } elsif ($m->{mode_b} !~ /755$/ && $m->{mode_a} =~ /755$/) {
342 sys(qw(svn propdel svn:executable), $m->{file_b});
343 }
344}
345sub svn_ensure_parent_path {
347 my $dir_b = dirname(shift);
348 svn_ensure_parent_path($dir_b) if ($dir_b ne File::Spec->curdir);
349 mkpath([$dir_b]) unless (-d $dir_b);
350 sys(qw(svn add -N), $dir_b) unless (-d "$dir_b/.svn");
351}
352sub svn_checkout_tree {
354 my ($svn_rev, $commit) = @_;
355 my $from = file_to_s("$REV_DIR/$svn_rev");
356 assert_svn_wc_clean($svn_rev,$from);
357 print "diff-tree '$from' '$commit'\n";
358 my $pid = open my $diff_fh, '-|';
359 defined $pid or croak $!;
360 if ($pid == 0) {
361 my @diff_tree = qw(git-diff-tree -z -r -C);
362 push @diff_tree, '--find-copies-harder' if $_find_copies_harder;
363 push @diff_tree, "-l$_l" if defined $_l;
364 exec(@diff_tree, $from, $commit) or croak $!;
365 }
366 my $mods = parse_diff_tree($diff_fh);
367 unless (@$mods) {
368 # git can do empty commits, SVN doesn't allow it...
369 return $svn_rev;
370 }
371 my %rm;
372 foreach my $m (@$mods) {
373 if ($m->{chg} eq 'C') {
374 svn_ensure_parent_path( $m->{file_b} );
375 sys(qw(svn cp), $m->{file_a}, $m->{file_b});
376 blob_to_file( $m->{sha1_b}, $m->{file_b});
377 svn_check_prop_executable($m);
378 } elsif ($m->{chg} eq 'D') {
379 $rm{dirname $m->{file_b}}->{basename $m->{file_b}} = 1;
380 sys(qw(svn rm --force), $m->{file_b});
381 } elsif ($m->{chg} eq 'R') {
382 svn_ensure_parent_path( $m->{file_b} );
383 sys(qw(svn mv --force), $m->{file_a}, $m->{file_b});
384 blob_to_file( $m->{sha1_b}, $m->{file_b});
385 svn_check_prop_executable($m);
386 $rm{dirname $m->{file_a}}->{basename $m->{file_a}} = 1;
387 } elsif ($m->{chg} eq 'M') {
388 if ($m->{mode_b} =~ /^120/ && $m->{mode_a} =~ /^120/) {
389 unlink $m->{file_b} or croak $!;
390 blob_to_symlink($m->{sha1_b}, $m->{file_b});
391 } else {
392 blob_to_file($m->{sha1_b}, $m->{file_b});
393 }
394 svn_check_prop_executable($m);
395 } elsif ($m->{chg} eq 'T') {
396 sys(qw(svn rm --force),$m->{file_b});
397 if ($m->{mode_b} =~ /^120/ && $m->{mode_a} =~ /^100/) {
398 blob_to_symlink($m->{sha1_b}, $m->{file_b});
399 } else {
400 blob_to_file($m->{sha1_b}, $m->{file_b});
401 }
402 svn_check_prop_executable($m);
403 sys(qw(svn add --force), $m->{file_b});
404 } elsif ($m->{chg} eq 'A') {
405 svn_ensure_parent_path( $m->{file_b} );
406 blob_to_file( $m->{sha1_b}, $m->{file_b});
407 if ($m->{mode_b} =~ /755$/) {
408 chmod 0755, $m->{file_b};
409 }
410 sys(qw(svn add --force), $m->{file_b});
411 } else {
412 croak "Invalid chg: $m->{chg}\n";
413 }
414 }
415 if ($_rmdir) {
416 my $old_index = $ENV{GIT_INDEX_FILE};
417 $ENV{GIT_INDEX_FILE} = $GIT_SVN_INDEX;
418 foreach my $dir (keys %rm) {
419 my $files = $rm{$dir};
420 my @files;
421 foreach (safe_qx('svn','ls',$dir)) {
422 chomp;
423 push @files, $_ unless $files->{$_};
424 }
425 sys(qw(svn rm),$dir) unless @files;
426 }
427 if ($old_index) {
428 $ENV{GIT_INDEX_FILE} = $old_index;
429 } else {
430 delete $ENV{GIT_INDEX_FILE};
431 }
432 }
433}
434sub svn_commit_tree {
436 my ($svn_rev, $commit) = @_;
437 my $commit_msg = "$GIT_DIR/$GIT_SVN/.svn-commit.tmp.$$";
438 open my $msg, '>', $commit_msg or croak $!;
439 chomp(my $type = `git-cat-file -t $commit`);
441 if ($type eq 'commit') {
442 my $pid = open my $msg_fh, '-|';
443 defined $pid or croak $!;
444 if ($pid == 0) {
446 exec(qw(git-cat-file commit), $commit) or croak $!;
447 }
448 my $in_msg = 0;
449 while (<$msg_fh>) {
450 if (!$in_msg) {
451 $in_msg = 1 if (/^\s*$/);
452 } else {
453 print $msg $_ or croak $!;
454 }
455 }
456 close $msg_fh or croak $!;
457 }
458 close $msg or croak $!;
459 if ($_edit || ($type eq 'tree')) {
461 my $editor = $ENV{VISUAL} || $ENV{EDITOR} || 'vi';
462 system($editor, $commit_msg);
463 }
464 my @ci_output = safe_qx(qw(svn commit -F),$commit_msg);
465 my ($committed) = grep(/^Committed revision \d+\./,@ci_output);
466 unlink $commit_msg;
467 defined $committed or croak
468 "Commit output failed to parse committed revision!\n",
469 join("\n",@ci_output),"\n";
470 my ($rev_committed) = ($committed =~ /^Committed revision (\d+)\./);
471 # resync immediately
473 my @svn_up = (qw(svn up), "-r$svn_rev");
474 push @svn_up, '--ignore-externals' unless $_no_ignore_ext;
475 sys(@svn_up);
476 return fetch("$rev_committed=$commit")->{revision};
477}
478sub svn_log_xml {
480 my (@log_args) = @_;
481 my $log_fh = IO::File->new_tmpfile or croak $!;
482 my $pid = fork;
484 defined $pid or croak $!;
485 if ($pid == 0) {
487 open STDOUT, '>&', $log_fh or croak $!;
488 exec (qw(svn log --xml), @log_args) or croak $!
489 }
490 waitpid $pid, 0;
492 croak $? if $?;
493 seek $log_fh, 0, 0;
495 my @svn_log;
496 my $log = XML::Simple::XMLin( $log_fh,
497 ForceArray => ['path','revision','logentry'],
498 KeepRoot => 0,
499 KeyAttr => { logentry => '+revision',
500 paths => '+path' },
501 )->{logentry};
502 foreach my $r (sort {$a <=> $b} keys %$log) {
503 my $log_msg = $log->{$r};
504 my ($Y,$m,$d,$H,$M,$S) = ($log_msg->{date} =~
505 /(\d{4})\-(\d\d)\-(\d\d)T
506 (\d\d)\:(\d\d)\:(\d\d)\.\d+Z$/x)
507 or croak "Failed to parse date: ",
508 $log->{$r}->{date};
509 $log_msg->{date} = "+0000 $Y-$m-$d $H:$M:$S";
510 # XML::Simple can't handle <msg></msg> as a string:
512 if (ref $log_msg->{msg} eq 'HASH') {
513 $log_msg->{msg} = "\n";
514 } else {
515 $log_msg->{msg} .= "\n";
516 }
517 push @svn_log, $log->{$r};
518 }
519 return \@svn_log;
520}
521sub svn_log_raw {
523 my (@log_args) = @_;
524 my $pid = open my $log_fh,'-|';
525 defined $pid or croak $!;
526 if ($pid == 0) {
528 exec (qw(svn log), @log_args) or croak $!
529 }
530 my @svn_log;
532 my $state;
533 while (<$log_fh>) {
534 chomp;
535 if (/^\-{72}$/) {
536 $state = 'rev';
537 # if we have an empty log message, put something there:
539 if (@svn_log) {
540 $svn_log[$#svn_log]->{msg} ||= "\n";
541 }
542 next;
543 }
544 if ($state eq 'rev' && s/^r(\d+)\s*\|\s*//) {
545 my $rev = $1;
546 my ($author, $date) = split(/\s*\|\s*/, $_, 2);
547 my ($Y,$m,$d,$H,$M,$S,$tz) = ($date =~
548 /(\d{4})\-(\d\d)\-(\d\d)\s
549 (\d\d)\:(\d\d)\:(\d\d)\s([\-\+]\d+)/x)
550 or croak "Failed to parse date: $date\n";
551 my %log_msg = ( revision => $rev,
552 date => "$tz $Y-$m-$d $H:$M:$S",
553 author => $author,
554 msg => '' );
555 push @svn_log, \%log_msg;
556 $state = 'msg_start';
557 next;
558 }
559 # skip the first blank line of the message:
560 if ($state eq 'msg_start' && /^$/) {
561 $state = 'msg';
562 } elsif ($state eq 'msg') {
563 $svn_log[$#svn_log]->{msg} .= $_."\n";
564 }
565 }
566 close $log_fh or croak $?;
567 return \@svn_log;
568}
569sub svn_info {
571 my $url = shift || $SVN_URL;
572 my $pid = open my $info_fh, '-|';
574 defined $pid or croak $!;
575 if ($pid == 0) {
577 exec(qw(svn info),$url) or croak $!;
578 }
579 my $ret = {};
581 # only single-lines seem to exist in svn info output
582 while (<$info_fh>) {
583 chomp $_;
584 if (m#^([^:]+)\s*:\s*(\S*)$#) {
585 $ret->{$1} = $2;
586 push @{$ret->{-order}}, $1;
587 }
588 }
589 close $info_fh or croak $!;
590 return $ret;
591}
592sub sys { system(@_) == 0 or croak $? }
594sub git_addremove {
596 system( "git-diff-files --name-only -z ".
597 " | git-update-index --remove -z --stdin; ".
598 "git-ls-files -z --others ".
599 "'--exclude-from=$GIT_DIR/$GIT_SVN/info/exclude'".
600 " | git-update-index --add -z --stdin; "
601 ) == 0 or croak $?
602}
603sub s_to_file {
605 my ($str, $file, $mode) = @_;
606 open my $fd,'>',$file or croak $!;
607 print $fd $str,"\n" or croak $!;
608 close $fd or croak $!;
609 chmod ($mode &~ umask, $file) if (defined $mode);
610}
611sub file_to_s {
613 my $file = shift;
614 open my $fd,'<',$file or croak "$!: file: $file\n";
615 local $/;
616 my $ret = <$fd>;
617 close $fd or croak $!;
618 $ret =~ s/\s*$//s;
619 return $ret;
620}
621sub assert_revision_unknown {
623 my $revno = shift;
624 if (-f "$REV_DIR/$revno") {
625 croak "$REV_DIR/$revno already exists! ",
626 "Why are we refetching it?";
627 }
628}
629sub assert_revision_eq_or_unknown {
631 my ($revno, $commit) = @_;
632 if (-f "$REV_DIR/$revno") {
633 my $current = file_to_s("$REV_DIR/$revno");
634 if ($commit ne $current) {
635 croak "$REV_DIR/$revno already exists!\n",
636 "current: $current\nexpected: $commit\n";
637 }
638 return;
639 }
640}
641sub git_commit {
643 my ($log_msg, @parents) = @_;
644 assert_revision_unknown($log_msg->{revision});
645 my $out_fh = IO::File->new_tmpfile or croak $!;
646 my $info = svn_info('.');
647 my $uuid = $info->{'Repository UUID'};
648 defined $uuid or croak "Unable to get Repository UUID\n";
649 # commit parents can be conditionally bound to a particular
651 # svn revision via: "svn_revno=commit_sha1", filter them out here:
652 my @exec_parents;
653 foreach my $p (@parents) {
654 next unless defined $p;
655 if ($p =~ /^(\d+)=($sha1_short)$/o) {
656 if ($1 == $log_msg->{revision}) {
657 push @exec_parents, $2;
658 }
659 } else {
660 push @exec_parents, $p if $p =~ /$sha1_short/o;
661 }
662 }
663 my $pid = fork;
665 defined $pid or croak $!;
666 if ($pid == 0) {
667 $ENV{GIT_INDEX_FILE} = $GIT_SVN_INDEX;
668 git_addremove();
669 chomp(my $tree = `git-write-tree`);
670 croak if $?;
671 my $msg_fh = IO::File->new_tmpfile or croak $!;
672 print $msg_fh $log_msg->{msg}, "\ngit-svn-id: ",
673 "$SVN_URL\@$log_msg->{revision}",
674 " $uuid\n" or croak $!;
675 $msg_fh->flush == 0 or croak $!;
676 seek $msg_fh, 0, 0 or croak $!;
677 $ENV{GIT_AUTHOR_NAME} = $ENV{GIT_COMMITTER_NAME} =
679 $log_msg->{author};
680 $ENV{GIT_AUTHOR_EMAIL} = $ENV{GIT_COMMITTER_EMAIL} =
681 $log_msg->{author}."\@$uuid";
682 $ENV{GIT_AUTHOR_DATE} = $ENV{GIT_COMMITTER_DATE} =
683 $log_msg->{date};
684 my @exec = ('git-commit-tree',$tree);
685 push @exec, '-p', $_ foreach @exec_parents;
686 open STDIN, '<&', $msg_fh or croak $!;
687 open STDOUT, '>&', $out_fh or croak $!;
688 exec @exec or croak $!;
689 }
690 waitpid($pid,0);
691 croak if $?;
692 $out_fh->flush == 0 or croak $!;
694 seek $out_fh, 0, 0 or croak $!;
695 chomp(my $commit = do { local $/; <$out_fh> });
696 if ($commit !~ /^$sha1$/o) {
697 croak "Failed to commit, invalid sha1: $commit\n";
698 }
699 my @update_ref = ('git-update-ref',"refs/heads/$GIT_SVN-HEAD",$commit);
700 if (my $primary_parent = shift @exec_parents) {
701 push @update_ref, $primary_parent;
702 }
703 sys(@update_ref);
704 sys('git-update-ref',"$GIT_SVN/revs/$log_msg->{revision}",$commit);
705 print "r$log_msg->{revision} = $commit\n";
706 return $commit;
707}
708sub blob_to_symlink {
710 my ($blob, $link) = @_;
711 defined $link or croak "\$link not defined!\n";
712 croak "Not a sha1: $blob\n" unless $blob =~ /^$sha1$/o;
713 my $dest = `git-cat-file blob $blob`; # no newline, so no chomp
714 symlink $dest, $link or croak $!;
715}
716sub blob_to_file {
718 my ($blob, $file) = @_;
719 defined $file or croak "\$file not defined!\n";
720 croak "Not a sha1: $blob\n" unless $blob =~ /^$sha1$/o;
721 open my $blob_fh, '>', $file or croak "$!: $file\n";
722 my $pid = fork;
723 defined $pid or croak $!;
724 if ($pid == 0) {
726 open STDOUT, '>&', $blob_fh or croak $!;
727 exec('git-cat-file','blob',$blob);
728 }
729 waitpid $pid, 0;
730 croak $? if $?;
731 close $blob_fh or croak $!;
733}
734sub safe_qx {
736 my $pid = open my $child, '-|';
737 defined $pid or croak $!;
738 if ($pid == 0) {
739 exec(@_) or croak $?;
740 }
741 my @ret = (<$child>);
742 close $child or croak $?;
743 die $? if $?; # just in case close didn't error out
744 return wantarray ? @ret : join('',@ret);
745}
746sub svn_check_ignore_externals {
748 return if $_no_ignore_ext;
749 unless (grep /ignore-externals/,(safe_qx(qw(svn co -h)))) {
750 print STDERR "W: Installed svn version does not support ",
751 "--ignore-externals\n";
752 $_no_ignore_ext = 1;
753 }
754}
755__END__
756Data structures:
758@svn_log = array of log_msg hashes
760$log_msg hash
762{
763 msg => 'whitespace-formatted log entry
764', # trailing newline is preserved
765 revision => '8', # integer
766 date => '2004-02-24T17:01:44.108345Z', # commit date
767 author => 'committer name'
768};
769@mods = array of diff-index line hashes, each element represents one line
772 of diff-index output
773diff-index line ($m hash)
775{
776 mode_a => first column of diff-index output, no leading ':',
777 mode_b => second column of diff-index output,
778 sha1_b => sha1sum of the final blob,
779 chg => change type [MCRAD],
780 file_a => original file name of a file (iff chg is 'C' or 'R')
781 file_b => new/current file name of a file (any chg)
782}
783;