6ed471918df25006314f3f2c6177bdd018757068
[git/git.git] / git-cvsexportcommit.perl
1 #!/usr/bin/perl -w
2
3 # Known limitations:
4 # - does not propagate permissions
5 # - error handling has not been extensively tested
6 #
7
8 use strict;
9 use Getopt::Std;
10 use File::Temp qw(tempdir);
11 use Data::Dumper;
12 use File::Basename qw(basename dirname);
13
14 unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
15 die "GIT_DIR is not defined or is unreadable";
16 }
17
18 our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d);
19
20 getopts('hPpvcfam:d:');
21
22 $opt_h && usage();
23
24 die "Need at least one commit identifier!" unless @ARGV;
25
26 my @cvs;
27 if ($opt_d) {
28 @cvs = ('cvs', '-d', $opt_d);
29 } else {
30 @cvs = ('cvs');
31 }
32
33 # setup a tempdir
34 our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX',
35 TMPDIR => 1,
36 CLEANUP => 1);
37
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!";
45 }
46
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!";
55 }
56 }
57
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 = '';
66
67 foreach my $line (@commit) {
68 chomp $line;
69 if ($stage eq 'headers' && $line eq '') {
70 $stage = 'msg';
71 next;
72 }
73
74 if ($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;
81 }
82 } else {
83 $msg .= $line . "\n";
84 unless ($title) {
85 $title = $line;
86 }
87 }
88 }
89
90 if ($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
98 }
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";
105 }
106 }
107
108 $opt_v && print "Applying to CVS commit $commit from parent $parent\n";
109
110 # grab the commit message
111 open(MSG, ">.msg") or die "Cannot open .msg for writing";
112 if ($opt_m) {
113 print MSG $opt_m;
114 }
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";
120 }
121 }
122 close MSG;
123
124 `git-diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
125
126 ## apply non-binary changes
127
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';
133
134 print "Checking if patch will apply\n";
135
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,$1) if m/^ delete mode [0-7]+ (.*)$/;
148 }
149 map { s/^"(.*)"$/$1/g } @bfiles,@files;
150 map { s/\\([0-7]{3})/sprintf('%c',oct $1)/eg } @bfiles,@files;
151
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;
160 }
161 }
162
163 foreach my $d (@dirs) {
164 if (-e $d) {
165 $dirty = 1;
166 warn "$d exists and is not a directory!\n";
167 }
168 }
169 foreach my $f (@afiles) {
170 # This should return only one value
171 if ($f =~ m,(.*)/[^/]*$,) {
172 my $p = $1;
173 next if (grep { $_ eq $p } @dirs);
174 }
175 my @status = grep(m/^File/, safe_pipe_capture(@cvs, '-q', 'status' ,$f));
176 if (@status > 1) { warn 'Strange! cvs status returned more than one line?'};
177 if (-d dirname $f and $status[0] !~ m/Status: Unknown$/
178 and $status[0] !~ m/^File: no file /) {
179 $dirty = 1;
180 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";
181 warn "Status was: $status[0]\n";
182 }
183 }
184
185 foreach my $f (@files) {
186 next if grep { $_ eq $f } @afiles;
187 # TODO:we need to handle removed in cvs
188 my @status = grep(m/^File/, safe_pipe_capture(@cvs, '-q', 'status' ,$f));
189 if (@status > 1) { warn 'Strange! cvs status returned more than one line?'};
190 unless ($status[0] =~ m/Status: Up-to-date$/) {
191 $dirty = 1;
192 warn "File $f not up to date in your CVS checkout!\n";
193 }
194 }
195 if ($dirty) {
196 if ($opt_f) { warn "The tree is not clean -- forced merge\n";
197 $dirty = 0;
198 } else {
199 die "Exiting: your CVS tree is not clean for this merge.";
200 }
201 }
202
203 print "Applying\n";
204 `GIT_DIR= git-apply $context --binary --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch";
205
206 print "Patch applied successfully. Adding new files and directories to CVS\n";
207 my $dirtypatch = 0;
208 foreach my $d (@dirs) {
209 if (system(@cvs,'add',$d)) {
210 $dirtypatch = 1;
211 warn "Failed to cvs add directory $d -- you may need to do it manually";
212 }
213 }
214
215 foreach my $f (@afiles) {
216 if (grep { $_ eq $f } @bfiles) {
217 system(@cvs, 'add','-kb',$f);
218 } else {
219 system(@cvs, 'add', $f);
220 }
221 if ($?) {
222 $dirtypatch = 1;
223 warn "Failed to cvs add $f -- you may need to do it manually";
224 }
225 }
226
227 foreach my $f (@dfiles) {
228 system(@cvs, 'rm', '-f', $f);
229 if ($?) {
230 $dirtypatch = 1;
231 warn "Failed to cvs rm -f $f -- you may need to do it manually";
232 }
233 }
234
235 print "Commit to CVS\n";
236 print "Patch title (first comment line): $title\n";
237 my @commitfiles = map { unless (m/\s/) { '\''.$_.'\''; } else { $_; }; } (@files);
238 my $cmd = join(' ', @cvs)." commit -F .msg @commitfiles";
239
240 if ($dirtypatch) {
241 print "NOTE: One or more hunks failed to apply cleanly.\n";
242 print "You'll need to apply the patch in .cvsexportcommit.diff manually\n";
243 print "using a patch program. After applying the patch and resolving the\n";
244 print "problems you may commit using:";
245 print "\n $cmd\n\n";
246 exit(1);
247 }
248
249 if ($opt_c) {
250 print "Autocommit\n $cmd\n";
251 print safe_pipe_capture(@cvs, 'commit', '-F', '.msg', @files);
252 if ($?) {
253 die "Exiting: The commit did not succeed";
254 }
255 print "Committed successfully to CVS\n";
256 # clean up
257 unlink(".msg");
258 } else {
259 print "Ready for you to commit, just run:\n\n $cmd\n";
260 }
261
262 # clean up
263 unlink(".cvsexportcommit.diff");
264
265 sub usage {
266 print STDERR <<END;
267 Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [-f] [-m msgprefix] [ parent ] commit
268 END
269 exit(1);
270 }
271
272 # An alternative to `command` that allows input to be passed as an array
273 # to work around shell problems with weird characters in arguments
274 # if the exec returns non-zero we die
275 sub safe_pipe_capture {
276 my @output;
277 if (my $pid = open my $child, '-|') {
278 @output = (<$child>);
279 close $child or die join(' ',@_).": $! $?";
280 } else {
281 exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
282 }
283 return wantarray ? @output : join('',@output);
284 }
285
286 sub safe_pipe_capture_blob {
287 my $output;
288 if (my $pid = open my $child, '-|') {
289 local $/;
290 undef $/;
291 $output = (<$child>);
292 close $child or die join(' ',@_).": $! $?";
293 } else {
294 exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
295 }
296 return $output;
297 }