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# use eval { require SVN::... } to make it lazy load
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 my $svn_log = svn_log_raw(@log_args);
181 @$svn_log = sort { $a->{revision} <=> $b->{revision} } @$svn_log;
182 my $base = shift @$svn_log or croak "No base revision!\n";
184 my $last_commit = undef;
185 unless (-d $SVN_WC) {
186 my @svn_co = ('svn','co',"-r$base->{revision}");
187 push @svn_co,'--ignore-externals' unless $_no_ignore_ext;
188 sys(@svn_co, $SVN_URL, $SVN_WC);
189 chdir $SVN_WC or croak $!;
190 $last_commit = git_commit($base, @parents);
191 unless (-f "$GIT_DIR/refs/heads/master") {
192 sys(qw(git-update-ref refs/heads/master),$last_commit);
193 }
194 assert_svn_wc_clean($base->{revision}, $last_commit);
195 } else {
196 chdir $SVN_WC or croak $!;
197 $last_commit = file_to_s("$REV_DIR/$base->{revision}");
198 }
199 my @svn_up = qw(svn up);
200 push @svn_up, '--ignore-externals' unless $_no_ignore_ext;
201 my $last_rev = $base->{revision};
202 foreach my $log_msg (@$svn_log) {
203 assert_svn_wc_clean($last_rev, $last_commit);
204 $last_rev = $log_msg->{revision};
205 sys(@svn_up,"-r$last_rev");
206 $last_commit = git_commit($log_msg, $last_commit, @parents);
207 }
208 assert_svn_wc_clean($last_rev, $last_commit);
209 return pop @$svn_log;
210}
211sub commit {
213 my (@commits) = @_;
214 if ($_stdin || !@commits) {
215 print "Reading from stdin...\n";
216 @commits = ();
217 while (<STDIN>) {
218 if (/\b([a-f\d]{6,40})\b/) {
219 unshift @commits, $1;
220 }
221 }
222 }
223 my @revs;
224 foreach my $c (@commits) {
225 chomp(my @tmp = safe_qx('git-rev-parse',$c));
226 if (scalar @tmp == 1) {
227 push @revs, $tmp[0];
228 } elsif (scalar @tmp > 1) {
229 push @revs, reverse (safe_qx('git-rev-list',@tmp));
230 } else {
231 die "Failed to rev-parse $c\n";
232 }
233 }
234 chomp @revs;
235 fetch();
237 chdir $SVN_WC or croak $!;
238 my $svn_current_rev = svn_info('.')->{'Last Changed Rev'};
239 foreach my $c (@revs) {
240 print "Committing $c\n";
241 my $mods = svn_checkout_tree($svn_current_rev, $c);
242 if (scalar @$mods == 0) {
243 print "Skipping, no changes detected\n";
244 next;
245 }
246 $svn_current_rev = svn_commit_tree($svn_current_rev, $c);
247 }
248 print "Done committing ",scalar @revs," revisions to SVN\n";
249}
251########################### utility functions #########################
253sub setup_git_svn {
255 defined $SVN_URL or croak "SVN repository location required\n";
256 unless (-d $GIT_DIR) {
257 croak "GIT_DIR=$GIT_DIR does not exist!\n";
258 }
259 mkpath(["$GIT_DIR/$GIT_SVN"]);
260 mkpath(["$GIT_DIR/$GIT_SVN/info"]);
261 mkpath([$REV_DIR]);
262 s_to_file($SVN_URL,"$GIT_DIR/$GIT_SVN/info/url");
263 my $uuid = svn_info($SVN_URL)->{'Repository UUID'} or
264 croak "Repository UUID unreadable\n";
265 s_to_file($uuid,"$GIT_DIR/$GIT_SVN/info/uuid");
266 open my $fd, '>>', "$GIT_DIR/$GIT_SVN/info/exclude" or croak $!;
268 print $fd '.svn',"\n";
269 close $fd or croak $!;
270 return $uuid;
271}
272sub assert_svn_wc_clean {
274 my ($svn_rev, $treeish) = @_;
275 croak "$svn_rev is not an integer!\n" unless ($svn_rev =~ /^\d+$/);
276 croak "$treeish is not a sha1!\n" unless ($treeish =~ /^$sha1$/o);
277 my $svn_info = svn_info('.');
278 if ($svn_rev != $svn_info->{'Last Changed Rev'}) {
279 croak "Expected r$svn_rev, got r",
280 $svn_info->{'Last Changed Rev'},"\n";
281 }
282 my @status = grep(!/^Performing status on external/,(`svn status`));
283 @status = grep(!/^\s*$/,@status);
284 if (scalar @status) {
285 print STDERR "Tree ($SVN_WC) is not clean:\n";
286 print STDERR $_ foreach @status;
287 croak;
288 }
289 assert_tree($treeish);
290}
291sub assert_tree {
293 my ($treeish) = @_;
294 croak "Not a sha1: $treeish\n" unless $treeish =~ /^$sha1$/o;
295 chomp(my $type = `git-cat-file -t $treeish`);
296 my $expected;
297 while ($type eq 'tag') {
298 chomp(($treeish, $type) = `git-cat-file tag $treeish`);
299 }
300 if ($type eq 'commit') {
301 $expected = (grep /^tree /,`git-cat-file commit $treeish`)[0];
302 ($expected) = ($expected =~ /^tree ($sha1)$/);
303 die "Unable to get tree from $treeish\n" unless $expected;
304 } elsif ($type eq 'tree') {
305 $expected = $treeish;
306 } else {
307 die "$treeish is a $type, expected tree, tag or commit\n";
308 }
309 my $old_index = $ENV{GIT_INDEX_FILE};
311 my $tmpindex = $GIT_SVN_INDEX.'.assert-tmp';
312 if (-e $tmpindex) {
313 unlink $tmpindex or croak $!;
314 }
315 $ENV{GIT_INDEX_FILE} = $tmpindex;
316 git_addremove();
317 chomp(my $tree = `git-write-tree`);
318 if ($old_index) {
319 $ENV{GIT_INDEX_FILE} = $old_index;
320 } else {
321 delete $ENV{GIT_INDEX_FILE};
322 }
323 if ($tree ne $expected) {
324 croak "Tree mismatch, Got: $tree, Expected: $expected\n";
325 }
326}
327sub parse_diff_tree {
329 my $diff_fh = shift;
330 local $/ = "\0";
331 my $state = 'meta';
332 my @mods;
333 while (<$diff_fh>) {
334 chomp $_; # this gets rid of the trailing "\0"
335 if ($state eq 'meta' && /^:(\d{6})\s(\d{6})\s
336 $sha1\s($sha1)\s([MTCRAD])\d*$/xo) {
337 push @mods, { mode_a => $1, mode_b => $2,
338 sha1_b => $3, chg => $4 };
339 if ($4 =~ /^(?:C|R)$/) {
340 $state = 'file_a';
341 } else {
342 $state = 'file_b';
343 }
344 } elsif ($state eq 'file_a') {
345 my $x = $mods[$#mods] or croak "Empty array\n";
346 if ($x->{chg} !~ /^(?:C|R)$/) {
347 croak "Error parsing $_, $x->{chg}\n";
348 }
349 $x->{file_a} = $_;
350 $state = 'file_b';
351 } elsif ($state eq 'file_b') {
352 my $x = $mods[$#mods] or croak "Empty array\n";
353 if (exists $x->{file_a} && $x->{chg} !~ /^(?:C|R)$/) {
354 croak "Error parsing $_, $x->{chg}\n";
355 }
356 if (!exists $x->{file_a} && $x->{chg} =~ /^(?:C|R)$/) {
357 croak "Error parsing $_, $x->{chg}\n";
358 }
359 $x->{file_b} = $_;
360 $state = 'meta';
361 } else {
362 croak "Error parsing $_\n";
363 }
364 }
365 close $diff_fh or croak $!;
366 return \@mods;
368}
369sub svn_check_prop_executable {
371 my $m = shift;
372 return if -l $m->{file_b};
373 if ($m->{mode_b} =~ /755$/) {
374 chmod((0755 &~ umask),$m->{file_b}) or croak $!;
375 if ($m->{mode_a} !~ /755$/) {
376 sys(qw(svn propset svn:executable 1), $m->{file_b});
377 }
378 -x $m->{file_b} or croak "$m->{file_b} is not executable!\n";
379 } elsif ($m->{mode_b} !~ /755$/ && $m->{mode_a} =~ /755$/) {
380 sys(qw(svn propdel svn:executable), $m->{file_b});
381 chmod((0644 &~ umask),$m->{file_b}) or croak $!;
382 -x $m->{file_b} and croak "$m->{file_b} is executable!\n";
383 }
384}
385sub svn_ensure_parent_path {
387 my $dir_b = dirname(shift);
388 svn_ensure_parent_path($dir_b) if ($dir_b ne File::Spec->curdir);
389 mkpath([$dir_b]) unless (-d $dir_b);
390 sys(qw(svn add -N), $dir_b) unless (-d "$dir_b/.svn");
391}
392sub precommit_check {
394 my $mods = shift;
395 my (%rm_file, %rmdir_check, %added_check);
396 my %o = ( D => 0, R => 1, C => 2, A => 3, M => 3, T => 3 );
398 foreach my $m (sort { $o{$a->{chg}} <=> $o{$b->{chg}} } @$mods) {
399 if ($m->{chg} eq 'R') {
400 if (-d $m->{file_b}) {
401 err_dir_to_file("$m->{file_a} => $m->{file_b}");
402 }
403 # dir/$file => dir/file/$file
404 my $dirname = dirname($m->{file_b});
405 while ($dirname ne File::Spec->curdir) {
406 if ($dirname ne $m->{file_a}) {
407 $dirname = dirname($dirname);
408 next;
409 }
410 err_file_to_dir("$m->{file_a} => $m->{file_b}");
411 }
412 # baz/zzz => baz (baz is a file)
413 $dirname = dirname($m->{file_a});
414 while ($dirname ne File::Spec->curdir) {
415 if ($dirname ne $m->{file_b}) {
416 $dirname = dirname($dirname);
417 next;
418 }
419 err_dir_to_file("$m->{file_a} => $m->{file_b}");
420 }
421 }
422 if ($m->{chg} =~ /^(D|R)$/) {
423 my $t = $1 eq 'D' ? 'file_b' : 'file_a';
424 $rm_file{ $m->{$t} } = 1;
425 my $dirname = dirname( $m->{$t} );
426 my $basename = basename( $m->{$t} );
427 $rmdir_check{$dirname}->{$basename} = 1;
428 } elsif ($m->{chg} =~ /^(?:A|C)$/) {
429 if (-d $m->{file_b}) {
430 err_dir_to_file($m->{file_b});
431 }
432 my $dirname = dirname( $m->{file_b} );
433 my $basename = basename( $m->{file_b} );
434 $added_check{$dirname}->{$basename} = 1;
435 while ($dirname ne File::Spec->curdir) {
436 if ($rm_file{$dirname}) {
437 err_file_to_dir($m->{file_b});
438 }
439 $dirname = dirname $dirname;
440 }
441 }
442 }
443 return (\%rmdir_check, \%added_check);
444 sub err_dir_to_file {
446 my $file = shift;
447 print STDERR "Node change from directory to file ",
448 "is not supported by Subversion: ",$file,"\n";
449 exit 1;
450 }
451 sub err_file_to_dir {
452 my $file = shift;
453 print STDERR "Node change from file to directory ",
454 "is not supported by Subversion: ",$file,"\n";
455 exit 1;
456 }
457}
458sub svn_checkout_tree {
460 my ($svn_rev, $treeish) = @_;
461 my $from = file_to_s("$REV_DIR/$svn_rev");
462 assert_svn_wc_clean($svn_rev,$from);
463 print "diff-tree '$from' '$treeish'\n";
464 my $pid = open my $diff_fh, '-|';
465 defined $pid or croak $!;
466 if ($pid == 0) {
467 my @diff_tree = qw(git-diff-tree -z -r -C);
468 push @diff_tree, '--find-copies-harder' if $_find_copies_harder;
469 push @diff_tree, "-l$_l" if defined $_l;
470 exec(@diff_tree, $from, $treeish) or croak $!;
471 }
472 my $mods = parse_diff_tree($diff_fh);
473 unless (@$mods) {
474 # git can do empty commits, SVN doesn't allow it...
475 return $mods;
476 }
477 my ($rm, $add) = precommit_check($mods);
478 my %o = ( D => 1, R => 0, C => -1, A => 3, M => 3, T => 3 );
480 foreach my $m (sort { $o{$a->{chg}} <=> $o{$b->{chg}} } @$mods) {
481 if ($m->{chg} eq 'C') {
482 svn_ensure_parent_path( $m->{file_b} );
483 sys(qw(svn cp), $m->{file_a}, $m->{file_b});
484 apply_mod_line_blob($m);
485 svn_check_prop_executable($m);
486 } elsif ($m->{chg} eq 'D') {
487 sys(qw(svn rm --force), $m->{file_b});
488 } elsif ($m->{chg} eq 'R') {
489 svn_ensure_parent_path( $m->{file_b} );
490 sys(qw(svn mv --force), $m->{file_a}, $m->{file_b});
491 apply_mod_line_blob($m);
492 svn_check_prop_executable($m);
493 } elsif ($m->{chg} eq 'M') {
494 apply_mod_line_blob($m);
495 svn_check_prop_executable($m);
496 } elsif ($m->{chg} eq 'T') {
497 sys(qw(svn rm --force),$m->{file_b});
498 apply_mod_line_blob($m);
499 sys(qw(svn add --force), $m->{file_b});
500 svn_check_prop_executable($m);
501 } elsif ($m->{chg} eq 'A') {
502 svn_ensure_parent_path( $m->{file_b} );
503 apply_mod_line_blob($m);
504 sys(qw(svn add --force), $m->{file_b});
505 svn_check_prop_executable($m);
506 } else {
507 croak "Invalid chg: $m->{chg}\n";
508 }
509 }
510 assert_tree($treeish);
512 if ($_rmdir) { # remove empty directories
513 handle_rmdir($rm, $add);
514 }
515 assert_tree($treeish);
516 return $mods;
517}
518# svn ls doesn't work with respect to the current working tree, but what's
520# in the repository. There's not even an option for it... *sigh*
521# (added files don't show up and removed files remain in the ls listing)
522sub svn_ls_current {
523 my ($dir, $rm, $add) = @_;
524 chomp(my @ls = safe_qx('svn','ls',$dir));
525 my @ret = ();
526 foreach (@ls) {
527 s#/$##; # trailing slashes are evil
528 push @ret, $_ unless $rm->{$dir}->{$_};
529 }
530 if (exists $add->{$dir}) {
531 push @ret, keys %{$add->{$dir}};
532 }
533 return \@ret;
534}
535sub handle_rmdir {
537 my ($rm, $add) = @_;
538 foreach my $dir (sort {length $b <=> length $a} keys %$rm) {
540 my $ls = svn_ls_current($dir, $rm, $add);
541 next if (scalar @$ls);
542 sys(qw(svn rm --force),$dir);
543 my $dn = dirname $dir;
545 $rm->{ $dn }->{ basename $dir } = 1;
546 $ls = svn_ls_current($dn, $rm, $add);
547 while (scalar @$ls == 0 && $dn ne File::Spec->curdir) {
548 sys(qw(svn rm --force),$dn);
549 $dir = basename $dn;
550 $dn = dirname $dn;
551 $rm->{ $dn }->{ $dir } = 1;
552 $ls = svn_ls_current($dn, $rm, $add);
553 }
554 }
555}
556sub svn_commit_tree {
558 my ($svn_rev, $commit) = @_;
559 my $commit_msg = "$GIT_DIR/$GIT_SVN/.svn-commit.tmp.$$";
560 open my $msg, '>', $commit_msg or croak $!;
561 chomp(my $type = `git-cat-file -t $commit`);
563 if ($type eq 'commit') {
564 my $pid = open my $msg_fh, '-|';
565 defined $pid or croak $!;
566 if ($pid == 0) {
568 exec(qw(git-cat-file commit), $commit) or croak $!;
569 }
570 my $in_msg = 0;
571 while (<$msg_fh>) {
572 if (!$in_msg) {
573 $in_msg = 1 if (/^\s*$/);
574 } else {
575 print $msg $_ or croak $!;
576 }
577 }
578 close $msg_fh or croak $!;
579 }
580 close $msg or croak $!;
581 if ($_edit || ($type eq 'tree')) {
583 my $editor = $ENV{VISUAL} || $ENV{EDITOR} || 'vi';
584 system($editor, $commit_msg);
585 }
586 my @ci_output = safe_qx(qw(svn commit -F),$commit_msg);
587 my ($committed) = grep(/^Committed revision \d+\./,@ci_output);
588 unlink $commit_msg;
589 defined $committed or croak
590 "Commit output failed to parse committed revision!\n",
591 join("\n",@ci_output),"\n";
592 my ($rev_committed) = ($committed =~ /^Committed revision (\d+)\./);
593 # resync immediately
595 my @svn_up = (qw(svn up), "-r$svn_rev");
596 push @svn_up, '--ignore-externals' unless $_no_ignore_ext;
597 sys(@svn_up);
598 return fetch("$rev_committed=$commit")->{revision};
599}
600sub svn_log_raw {
602 my (@log_args) = @_;
603 my $pid = open my $log_fh,'-|';
604 defined $pid or croak $!;
605 if ($pid == 0) {
607 exec (qw(svn log), @log_args) or croak $!
608 }
609 my @svn_log;
611 my $state = 'sep';
612 while (<$log_fh>) {
613 chomp;
614 if (/^\-{72}$/) {
615 if ($state eq 'msg') {
616 if ($svn_log[$#svn_log]->{lines}) {
617 $svn_log[$#svn_log]->{msg} .= $_."\n";
618 unless(--$svn_log[$#svn_log]->{lines}) {
619 $state = 'sep';
620 }
621 } else {
622 croak "Log parse error at: $_\n",
623 $svn_log[$#svn_log]->{revision},
624 "\n";
625 }
626 next;
627 }
628 if ($state ne 'sep') {
629 croak "Log parse error at: $_\n",
630 "state: $state\n",
631 $svn_log[$#svn_log]->{revision},
632 "\n";
633 }
634 $state = 'rev';
635 # if we have an empty log message, put something there:
637 if (@svn_log) {
638 $svn_log[$#svn_log]->{msg} ||= "\n";
639 delete $svn_log[$#svn_log]->{lines};
640 }
641 next;
642 }
643 if ($state eq 'rev' && s/^r(\d+)\s*\|\s*//) {
644 my $rev = $1;
645 my ($author, $date, $lines) = split(/\s*\|\s*/, $_, 3);
646 ($lines) = ($lines =~ /(\d+)/);
647 my ($Y,$m,$d,$H,$M,$S,$tz) = ($date =~
648 /(\d{4})\-(\d\d)\-(\d\d)\s
649 (\d\d)\:(\d\d)\:(\d\d)\s([\-\+]\d+)/x)
650 or croak "Failed to parse date: $date\n";
651 my %log_msg = ( revision => $rev,
652 date => "$tz $Y-$m-$d $H:$M:$S",
653 author => $author,
654 lines => $lines,
655 msg => '' );
656 push @svn_log, \%log_msg;
657 $state = 'msg_start';
658 next;
659 }
660 # skip the first blank line of the message:
661 if ($state eq 'msg_start' && /^$/) {
662 $state = 'msg';
663 } elsif ($state eq 'msg') {
664 if ($svn_log[$#svn_log]->{lines}) {
665 $svn_log[$#svn_log]->{msg} .= $_."\n";
666 unless (--$svn_log[$#svn_log]->{lines}) {
667 $state = 'sep';
668 }
669 } else {
670 croak "Log parse error at: $_\n",
671 $svn_log[$#svn_log]->{revision},"\n";
672 }
673 }
674 }
675 close $log_fh or croak $?;
676 return \@svn_log;
677}
678sub svn_info {
680 my $url = shift || $SVN_URL;
681 my $pid = open my $info_fh, '-|';
683 defined $pid or croak $!;
684 if ($pid == 0) {
686 exec(qw(svn info),$url) or croak $!;
687 }
688 my $ret = {};
690 # only single-lines seem to exist in svn info output
691 while (<$info_fh>) {
692 chomp $_;
693 if (m#^([^:]+)\s*:\s*(\S*)$#) {
694 $ret->{$1} = $2;
695 push @{$ret->{-order}}, $1;
696 }
697 }
698 close $info_fh or croak $!;
699 return $ret;
700}
701sub sys { system(@_) == 0 or croak $? }
703sub git_addremove {
705 system( "git-diff-files --name-only -z ".
706 " | git-update-index --remove -z --stdin && ".
707 "git-ls-files -z --others ".
708 "'--exclude-from=$GIT_DIR/$GIT_SVN/info/exclude'".
709 " | git-update-index --add -z --stdin"
710 ) == 0 or croak $?
711}
712sub s_to_file {
714 my ($str, $file, $mode) = @_;
715 open my $fd,'>',$file or croak $!;
716 print $fd $str,"\n" or croak $!;
717 close $fd or croak $!;
718 chmod ($mode &~ umask, $file) if (defined $mode);
719}
720sub file_to_s {
722 my $file = shift;
723 open my $fd,'<',$file or croak "$!: file: $file\n";
724 local $/;
725 my $ret = <$fd>;
726 close $fd or croak $!;
727 $ret =~ s/\s*$//s;
728 return $ret;
729}
730sub assert_revision_unknown {
732 my $revno = shift;
733 if (-f "$REV_DIR/$revno") {
734 croak "$REV_DIR/$revno already exists! ",
735 "Why are we refetching it?";
736 }
737}
738sub assert_revision_eq_or_unknown {
740 my ($revno, $commit) = @_;
741 if (-f "$REV_DIR/$revno") {
742 my $current = file_to_s("$REV_DIR/$revno");
743 if ($commit ne $current) {
744 croak "$REV_DIR/$revno already exists!\n",
745 "current: $current\nexpected: $commit\n";
746 }
747 return;
748 }
749}
750sub git_commit {
752 my ($log_msg, @parents) = @_;
753 assert_revision_unknown($log_msg->{revision});
754 my $out_fh = IO::File->new_tmpfile or croak $!;
755 my $info = svn_info('.');
756 my $uuid = $info->{'Repository UUID'};
757 defined $uuid or croak "Unable to get Repository UUID\n";
758 # commit parents can be conditionally bound to a particular
760 # svn revision via: "svn_revno=commit_sha1", filter them out here:
761 my @exec_parents;
762 foreach my $p (@parents) {
763 next unless defined $p;
764 if ($p =~ /^(\d+)=($sha1_short)$/o) {
765 if ($1 == $log_msg->{revision}) {
766 push @exec_parents, $2;
767 }
768 } else {
769 push @exec_parents, $p if $p =~ /$sha1_short/o;
770 }
771 }
772 my $pid = fork;
774 defined $pid or croak $!;
775 if ($pid == 0) {
776 $ENV{GIT_INDEX_FILE} = $GIT_SVN_INDEX;
777 git_addremove();
778 chomp(my $tree = `git-write-tree`);
779 croak if $?;
780 my $msg_fh = IO::File->new_tmpfile or croak $!;
781 print $msg_fh $log_msg->{msg}, "\ngit-svn-id: ",
782 "$SVN_URL\@$log_msg->{revision}",
783 " $uuid\n" or croak $!;
784 $msg_fh->flush == 0 or croak $!;
785 seek $msg_fh, 0, 0 or croak $!;
786 $ENV{GIT_AUTHOR_NAME} = $ENV{GIT_COMMITTER_NAME} =
788 $log_msg->{author};
789 $ENV{GIT_AUTHOR_EMAIL} = $ENV{GIT_COMMITTER_EMAIL} =
790 $log_msg->{author}."\@$uuid";
791 $ENV{GIT_AUTHOR_DATE} = $ENV{GIT_COMMITTER_DATE} =
792 $log_msg->{date};
793 my @exec = ('git-commit-tree',$tree);
794 push @exec, '-p', $_ foreach @exec_parents;
795 open STDIN, '<&', $msg_fh or croak $!;
796 open STDOUT, '>&', $out_fh or croak $!;
797 exec @exec or croak $!;
798 }
799 waitpid($pid,0);
800 croak if $?;
801 $out_fh->flush == 0 or croak $!;
803 seek $out_fh, 0, 0 or croak $!;
804 chomp(my $commit = do { local $/; <$out_fh> });
805 if ($commit !~ /^$sha1$/o) {
806 croak "Failed to commit, invalid sha1: $commit\n";
807 }
808 my @update_ref = ('git-update-ref',"refs/heads/$GIT_SVN-HEAD",$commit);
809 if (my $primary_parent = shift @exec_parents) {
810 push @update_ref, $primary_parent;
811 }
812 sys(@update_ref);
813 sys('git-update-ref',"$GIT_SVN/revs/$log_msg->{revision}",$commit);
814 print "r$log_msg->{revision} = $commit\n";
815 return $commit;
816}
817sub apply_mod_line_blob {
819 my $m = shift;
820 if ($m->{mode_b} =~ /^120/) {
821 blob_to_symlink($m->{sha1_b}, $m->{file_b});
822 } else {
823 blob_to_file($m->{sha1_b}, $m->{file_b});
824 }
825}
826sub blob_to_symlink {
828 my ($blob, $link) = @_;
829 defined $link or croak "\$link not defined!\n";
830 croak "Not a sha1: $blob\n" unless $blob =~ /^$sha1$/o;
831 if (-l $link || -f _) {
832 unlink $link or croak $!;
833 }
834 my $dest = `git-cat-file blob $blob`; # no newline, so no chomp
836 symlink $dest, $link or croak $!;
837}
838sub blob_to_file {
840 my ($blob, $file) = @_;
841 defined $file or croak "\$file not defined!\n";
842 croak "Not a sha1: $blob\n" unless $blob =~ /^$sha1$/o;
843 if (-l $file || -f _) {
844 unlink $file or croak $!;
845 }
846 open my $blob_fh, '>', $file or croak "$!: $file\n";
848 my $pid = fork;
849 defined $pid or croak $!;
850 if ($pid == 0) {
852 open STDOUT, '>&', $blob_fh or croak $!;
853 exec('git-cat-file','blob',$blob);
854 }
855 waitpid $pid, 0;
856 croak $? if $?;
857 close $blob_fh or croak $!;
859}
860sub safe_qx {
862 my $pid = open my $child, '-|';
863 defined $pid or croak $!;
864 if ($pid == 0) {
865 exec(@_) or croak $?;
866 }
867 my @ret = (<$child>);
868 close $child or croak $?;
869 die $? if $?; # just in case close didn't error out
870 return wantarray ? @ret : join('',@ret);
871}
872sub svn_check_ignore_externals {
874 return if $_no_ignore_ext;
875 unless (grep /ignore-externals/,(safe_qx(qw(svn co -h)))) {
876 print STDERR "W: Installed svn version does not support ",
877 "--ignore-externals\n";
878 $_no_ignore_ext = 1;
879 }
880}
881__END__
882Data structures:
884@svn_log = array of log_msg hashes
886$log_msg hash
888{
889 msg => 'whitespace-formatted log entry
890', # trailing newline is preserved
891 revision => '8', # integer
892 date => '2004-02-24T17:01:44.108345Z', # commit date
893 author => 'committer name'
894};
895@mods = array of diff-index line hashes, each element represents one line
898 of diff-index output
899diff-index line ($m hash)
901{
902 mode_a => first column of diff-index output, no leading ':',
903 mode_b => second column of diff-index output,
904 sha1_b => sha1sum of the final blob,
905 chg => change type [MCRAD],
906 file_a => original file name of a file (iff chg is 'C' or 'R')
907 file_b => new/current file name of a file (any chg)
908}
909;