Merge branch 'rs/archive'
[git/builtin-gsoc.git] / git-cvsexportcommit.perl
bloba33fa8d4c86da54a4d741cf921d1cf7b2138d186
1 #!/usr/bin/perl -w
3 # Known limitations:
4 # - does not propagate permissions
5 # - error handling has not been extensively tested
8 use strict;
9 use Getopt::Std;
10 use File::Temp qw(tempdir);
11 use Data::Dumper;
12 use File::Basename qw(basename dirname);
14 unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
15 die "GIT_DIR is not defined or is unreadable";
18 our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d, $opt_u);
20 getopts('uhPpvcfam:d:');
22 $opt_h && usage();
24 die "Need at least one commit identifier!" unless @ARGV;
26 my @cvs;
27 if ($opt_d) {
28 @cvs = ('cvs', '-d', $opt_d);
29 } else {
30 @cvs = ('cvs');
33 # setup a tempdir
34 our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX',
35 TMPDIR => 1,
36 CLEANUP => 1);
38 # resolve target commit
39 my $commit;
40 $commit = pop @ARGV;
41 $commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0");
42 chomp $commit;
43 if ($?) {
44 die "The commit reference $commit did not resolve!";
47 # resolve what parent we want
48 my $parent;
49 if (@ARGV) {
50 $parent = pop @ARGV;
51 $parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0");
52 chomp $parent;
53 if ($?) {
54 die "The parent reference did not resolve!";
58 # find parents from the commit itself
59 my @commit = safe_pipe_capture('git-cat-file', 'commit', $commit);
60 my @parents;
61 my $committer;
62 my $author;
63 my $stage = 'headers'; # headers, msg
64 my $title;
65 my $msg = '';
67 foreach my $line (@commit) {
68 chomp $line;
69 if ($stage eq 'headers' && $line eq '') {
70 $stage = 'msg';
71 next;
74 if ($stage eq 'headers') {
75 if ($line =~ m/^parent (\w{40})$/) { # found a parent
76 push @parents, $1;
77 } elsif ($line =~ m/^author (.+) \d+ [-+]\d+$/) {
78 $author = $1;
79 } elsif ($line =~ m/^committer (.+) \d+ [-+]\d+$/) {
80 $committer = $1;
82 } else {
83 $msg .= $line . "\n";
84 unless ($title) {
85 $title = $line;
90 if ($parent) {
91 my $found;
92 # double check that it's a valid parent
93 foreach my $p (@parents) {
94 if ($p eq $parent) {
95 $found = 1;
96 last;
97 }; # found it
99 die "Did not find $parent in the parents for this commit!" if !$found and !$opt_P;
100 } else { # we don't have a parent from the cmdline...
101 if (@parents == 1) { # it's safe to get it from the commit
102 $parent = $parents[0];
103 } else { # or perhaps not!
104 die "This commit has more than one parent -- please name the parent you want to use explicitly";
108 $opt_v && print "Applying to CVS commit $commit from parent $parent\n";
110 # grab the commit message
111 open(MSG, ">.msg") or die "Cannot open .msg for writing";
112 if ($opt_m) {
113 print MSG $opt_m;
115 print MSG $msg;
116 if ($opt_a) {
117 print MSG "\n\nAuthor: $author\n";
118 if ($author ne $committer) {
119 print MSG "Committer: $committer\n";
122 close MSG;
124 `git-diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
126 ## apply non-binary changes
128 # In pedantic mode require all lines of context to match. In normal
129 # mode, be compatible with diff/patch: assume 3 lines of context and
130 # require at least one line match, i.e. ignore at most 2 lines of
131 # context, like diff/patch do by default.
132 my $context = $opt_p ? '' : '-C1';
134 print "Checking if patch will apply\n";
136 my @stat;
137 open APPLY, "GIT_DIR= git-apply $context --binary --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch";
138 @stat=<APPLY>;
139 close APPLY || die "Cannot patch";
140 my (@bfiles,@files,@afiles,@dfiles);
141 chomp @stat;
142 foreach (@stat) {
143 push (@bfiles,$1) if m/^-\t-\t(.*)$/;
144 push (@files, $1) if m/^-\t-\t(.*)$/;
145 push (@files, $1) if m/^\d+\t\d+\t(.*)$/;
146 push (@afiles,$1) if m/^ create mode [0-7]+ (.*)$/;
147 push (@dfiles,$1) if m/^ delete mode [0-7]+ (.*)$/;
149 map { s/^"(.*)"$/$1/g } @bfiles,@files;
150 map { s/\\([0-7]{3})/sprintf('%c',oct $1)/eg } @bfiles,@files;
152 # check that the files are clean and up to date according to cvs
153 my $dirty;
154 my @dirs;
155 foreach my $p (@afiles) {
156 my $path = dirname $p;
157 while (!-d $path and ! grep { $_ eq $path } @dirs) {
158 unshift @dirs, $path;
159 $path = dirname $path;
163 # ... check dirs,
164 foreach my $d (@dirs) {
165 if (-e $d) {
166 $dirty = 1;
167 warn "$d exists and is not a directory!\n";
171 # ... query status of all files that we have a directory for and parse output of 'cvs status' to %cvsstat.
172 my @canstatusfiles;
173 foreach my $f (@files) {
174 my $path = dirname $f;
175 next if (grep { $_ eq $path } @dirs);
176 push @canstatusfiles, $f;
179 my %cvsstat;
180 if (@canstatusfiles) {
181 if ($opt_u) {
182 my @updated = safe_pipe_capture(@cvs, 'update', @canstatusfiles);
183 print @updated;
185 my @cvsoutput;
186 @cvsoutput= safe_pipe_capture(@cvs, 'status', @canstatusfiles);
187 my $matchcount = 0;
188 foreach my $l (@cvsoutput) {
189 chomp $l;
190 if ( $l =~ /^File:/ and $l =~ /Status: (.*)$/ ) {
191 $cvsstat{$canstatusfiles[$matchcount]} = $1;
192 $matchcount++;
197 # ... validate new files,
198 foreach my $f (@afiles) {
199 if (defined ($cvsstat{$f}) and $cvsstat{$f} ne "Unknown") {
200 $dirty = 1;
201 warn "File $f is already known in your CVS checkout -- perhaps it has been added by another user. Or this may indicate that it exists on a different branch. If this is the case, use -f to force the merge.\n";
202 warn "Status was: $cvsstat{$f}\n";
205 # ... validate known files.
206 foreach my $f (@files) {
207 next if grep { $_ eq $f } @afiles;
208 # TODO:we need to handle removed in cvs
209 unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") {
210 $dirty = 1;
211 warn "File $f not up to date but has status '$cvsstat{$f}' in your CVS checkout!\n";
214 if ($dirty) {
215 if ($opt_f) { warn "The tree is not clean -- forced merge\n";
216 $dirty = 0;
217 } else {
218 die "Exiting: your CVS tree is not clean for this merge.";
222 print "Applying\n";
223 `GIT_DIR= git-apply $context --binary --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch";
225 print "Patch applied successfully. Adding new files and directories to CVS\n";
226 my $dirtypatch = 0;
227 foreach my $d (@dirs) {
228 if (system(@cvs,'add',$d)) {
229 $dirtypatch = 1;
230 warn "Failed to cvs add directory $d -- you may need to do it manually";
234 foreach my $f (@afiles) {
235 if (grep { $_ eq $f } @bfiles) {
236 system(@cvs, 'add','-kb',$f);
237 } else {
238 system(@cvs, 'add', $f);
240 if ($?) {
241 $dirtypatch = 1;
242 warn "Failed to cvs add $f -- you may need to do it manually";
246 foreach my $f (@dfiles) {
247 system(@cvs, 'rm', '-f', $f);
248 if ($?) {
249 $dirtypatch = 1;
250 warn "Failed to cvs rm -f $f -- you may need to do it manually";
254 print "Commit to CVS\n";
255 print "Patch title (first comment line): $title\n";
256 my @commitfiles = map { unless (m/\s/) { '\''.$_.'\''; } else { $_; }; } (@files);
257 my $cmd = join(' ', @cvs)." commit -F .msg @commitfiles";
259 if ($dirtypatch) {
260 print "NOTE: One or more hunks failed to apply cleanly.\n";
261 print "You'll need to apply the patch in .cvsexportcommit.diff manually\n";
262 print "using a patch program. After applying the patch and resolving the\n";
263 print "problems you may commit using:";
264 print "\n $cmd\n\n";
265 exit(1);
268 if ($opt_c) {
269 print "Autocommit\n $cmd\n";
270 print safe_pipe_capture(@cvs, 'commit', '-F', '.msg', @files);
271 if ($?) {
272 die "Exiting: The commit did not succeed";
274 print "Committed successfully to CVS\n";
275 # clean up
276 unlink(".msg");
277 } else {
278 print "Ready for you to commit, just run:\n\n $cmd\n";
281 # clean up
282 unlink(".cvsexportcommit.diff");
284 # CVS version 1.11.x and 1.12.x sleeps the wrong way to ensure the timestamp
285 # used by CVS and the one set by subsequence file modifications are different.
286 # If they are not different CVS will not detect changes.
287 sleep(1);
289 sub usage {
290 print STDERR <<END;
291 Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [-f] [-m msgprefix] [ parent ] commit
293 exit(1);
296 # An alternative to `command` that allows input to be passed as an array
297 # to work around shell problems with weird characters in arguments
298 # if the exec returns non-zero we die
299 sub safe_pipe_capture {
300 my @output;
301 if (my $pid = open my $child, '-|') {
302 @output = (<$child>);
303 close $child or die join(' ',@_).": $! $?";
304 } else {
305 exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
307 return wantarray ? @output : join('',@output);
310 sub safe_pipe_capture_blob {
311 my $output;
312 if (my $pid = open my $child, '-|') {
313 local $/;
314 undef $/;
315 $output = (<$child>);
316 close $child or die join(' ',@_).": $! $?";
317 } else {
318 exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
320 return $output;