7 use File::Temp qw(tempdir);
9 use File::Basename qw(basename dirname);
13 our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d, $opt_u, $opt_w, $opt_W, $opt_k);
15 getopts('uhPpvcfkam:d:w:W');
19 die "Need at least one commit identifier!" unless @ARGV;
21 # Get git-config settings
22 my $repo = Git->repository();
23 $opt_w = $repo->config('cvsexportcommit.cvsdir') unless defined $opt_w;
25 if ($opt_w || $opt_W) {
26 # Remember where GIT_DIR is before changing to CVS checkout
27 unless ($ENV{GIT_DIR}) {
28 # No GIT_DIR set. Figure it out for ourselves
29 my $gd =`git-rev-parse --git-dir`;
33 # Make sure GIT_DIR is absolute
34 $ENV{GIT_DIR} = File::Spec->rel2abs($ENV{GIT_DIR});
38 if (! -d $opt_w."/CVS" ) {
39 die "$opt_w is not a CVS checkout";
41 chdir $opt_w or die "Cannot change to CVS checkout at $opt_w";
43 unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
44 die "GIT_DIR is not defined or is unreadable";
50 @cvs = ('cvs', '-d', $opt_d);
55 # resolve target commit
58 $commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0");
61 die "The commit reference $commit did not resolve!";
64 # resolve what parent we want
68 $parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0");
71 die "The parent reference did not resolve!";
75 # find parents from the commit itself
76 my @commit = safe_pipe_capture('git-cat-file', 'commit', $commit);
80 my $stage = 'headers'; # headers, msg
84 foreach my $line (@commit) {
86 if ($stage eq 'headers' && $line eq '') {
91 if ($stage eq 'headers') {
92 if ($line =~ m/^parent (\w{40})$/) { # found a parent
94 } elsif ($line =~ m/^author (.+) \d+ [-+]\d+$/) {
96 } elsif ($line =~ m/^committer (.+) \d+ [-+]\d+$/) {
100 $msg .= $line . "\n";
107 my $noparent = "0000000000000000000000000000000000000000";
110 # double check that it's a valid parent
111 foreach my $p (@parents) {
117 die "Did not find $parent in the parents for this commit!" if !$found and !$opt_P;
118 } else { # we don't have a parent from the cmdline...
119 if (@parents == 1) { # it's safe to get it from the commit
120 $parent = $parents[0];
121 } elsif (@parents == 0) { # there is no parent
123 } else { # cannot choose automatically from multiple parents
124 die "This commit has more than one parent -- please name the parent you want to use explicitly";
131 $opt_v && print "Resetting to $parent\n";
132 $go_back_to = `git symbolic-ref HEAD 2> /dev/null ||
133 git rev-parse HEAD` || die "Could not determine current branch";
134 system("git checkout -q $parent^0") && die "Could not check out $parent^0";
137 $opt_v && print "Applying to CVS commit $commit from parent $parent\n";
139 # grab the commit message
140 open(MSG, ">.msg") or die "Cannot open .msg for writing";
146 print MSG "\n\nAuthor: $author\n";
147 if ($author ne $committer) {
148 print MSG "Committer: $committer\n";
153 if ($parent eq $noparent) {
154 `git-diff-tree --binary -p --root $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
156 `git-diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
159 ## apply non-binary changes
161 # In pedantic mode require all lines of context to match. In normal
162 # mode, be compatible with diff/patch: assume 3 lines of context and
163 # require at least one line match, i.e. ignore at most 2 lines of
164 # context, like diff/patch do by default.
165 my $context = $opt_p ? '' : '-C1';
167 print "Checking if patch will apply\n";
170 open APPLY, "GIT_DIR= git-apply $context --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch";
172 close APPLY || die "Cannot patch";
173 my (@bfiles,@files,@afiles,@dfiles);
176 push (@bfiles,$1) if m/^-\t-\t(.*)$/;
177 push (@files, $1) if m/^-\t-\t(.*)$/;
178 push (@files, $1) if m/^\d+\t\d+\t(.*)$/;
179 push (@afiles,$1) if m/^ create mode [0-7]+ (.*)$/;
180 push (@dfiles,$1) if m/^ delete mode [0-7]+ (.*)$/;
182 map { s/^"(.*)"$/$1/g } @bfiles,@files;
183 map { s/\\([0-7]{3})/sprintf('%c',oct $1)/eg } @bfiles,@files;
185 # check that the files are clean and up to date according to cvs
188 foreach my $p (@afiles) {
189 my $path = dirname $p;
190 while (!-d $path and ! grep { $_ eq $path } @dirs) {
191 unshift @dirs, $path;
192 $path = dirname $path;
197 foreach my $d (@dirs) {
200 warn "$d exists and is not a directory!\n";
204 # ... query status of all files that we have a directory for and parse output of 'cvs status' to %cvsstat.
206 foreach my $f (@files) {
207 my $path = dirname $f;
208 next if (grep { $_ eq $path } @dirs);
209 push @canstatusfiles, $f;
213 if (@canstatusfiles) {
215 my @updated = xargs_safe_pipe_capture([@cvs, 'update'], @canstatusfiles);
218 # "cvs status" reorders the parameters, notably when there are multiple
219 # arguments with the same basename. So be precise here.
221 my %added = map { $_ => 1 } @afiles;
222 my %todo = map { $_ => 1 } @canstatusfiles;
225 my @canstatusfiles2 = ();
227 foreach my $name (keys %todo) {
228 my $basename = basename($name);
230 # CVS reports files that don't exist in the current revision as
231 # "no file $basename" in its "status" output, so we should
232 # anticipate that. Totally unknown files will have a status
233 # "Unknown". However, if they exist in the Attic, their status
234 # will be "Up-to-date" (this means they were added once but have
236 $basename = "no file $basename" if $added{$basename};
238 $basename =~ s/^\s+//;
239 $basename =~ s/\s+$//;
241 if (!exists($fullname{$basename})) {
242 $fullname{$basename} = $name;
243 push (@canstatusfiles2, $name);
244 delete($todo{$name});
248 @cvsoutput = xargs_safe_pipe_capture([@cvs, 'status'], @canstatusfiles2);
249 foreach my $l (@cvsoutput) {
252 my ($file, $status) = $l =~ /^File:\s+(.*\S)\s+Status: (.*)$/;
254 my $fullname = $fullname{$file};
255 print STDERR "Huh? Status '$status' reported for unexpected file '$file'\n"
256 unless defined $fullname;
258 # This response means the file does not exist except in
259 # CVS's attic, so set the status accordingly
261 if $file =~ /^no file /
262 && $status eq 'Up-to-date';
264 $cvsstat{$fullname{$file}} = $status
265 if defined $fullname{$file};
270 # ... Validate that new files have the correct status
271 foreach my $f (@afiles) {
272 next unless defined(my $stat = $cvsstat{$f});
274 # This means the file has never been seen before
275 next if $stat eq 'Unknown';
277 # This means the file has been seen before but was removed
278 next if $stat eq 'In-attic';
281 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";
282 warn "Status was: $cvsstat{$f}\n";
285 # ... validate known files.
286 foreach my $f (@files) {
287 next if grep { $_ eq $f } @afiles;
288 # TODO:we need to handle removed in cvs
289 unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") {
291 warn "File $f not up to date but has status '$cvsstat{$f}' in your CVS checkout!\n";
294 # Depending on how your GIT tree got imported from CVS you may
295 # have a conflict between expanded keywords in your CVS tree and
296 # unexpanded keywords in the patch about to be applied.
298 my $orig_file ="$f.orig";
299 rename $f, $orig_file;
300 open(FILTER_IN, "<$orig_file") or die "Cannot open $orig_file\n";
301 open(FILTER_OUT, ">$f") or die "Cannot open $f\n";
305 $line =~ s/\$([A-Z][a-z]+):[^\$]+\$/\$$1\$/g;
306 print FILTER_OUT $line;
314 if ($opt_f) { warn "The tree is not clean -- forced merge\n";
317 die "Exiting: your CVS tree is not clean for this merge.";
323 system("git checkout -q $commit^0") && die "cannot patch";
325 `GIT_DIR= git-apply $context --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch";
328 print "Patch applied successfully. Adding new files and directories to CVS\n";
332 # We have to add the directories in order otherwise we will have
333 # problems when we try and add the sub-directory of a directory we
334 # have not added yet.
336 # Luckily this is easy to deal with by sorting the directories and
337 # dealing with the shortest ones first.
339 @dirs = sort { length $a <=> length $b} @dirs;
341 foreach my $d (@dirs) {
342 if (system(@cvs,'add',$d)) {
344 warn "Failed to cvs add directory $d -- you may need to do it manually";
348 foreach my $f (@afiles) {
349 if (grep { $_ eq $f } @bfiles) {
350 system(@cvs, 'add','-kb',$f);
352 system(@cvs, 'add', $f);
356 warn "Failed to cvs add $f -- you may need to do it manually";
360 foreach my $f (@dfiles) {
361 system(@cvs, 'rm', '-f', $f);
364 warn "Failed to cvs rm -f $f -- you may need to do it manually";
368 print "Commit to CVS\n";
369 print "Patch title (first comment line): $title\n";
370 my @commitfiles = map { unless (m/\s/) { '\''.$_.'\''; } else { $_; }; } (@files);
371 my $cmd = join(' ', @cvs)." commit -F .msg @commitfiles";
374 print "NOTE: One or more hunks failed to apply cleanly.\n";
375 print "You'll need to apply the patch in .cvsexportcommit.diff manually\n";
376 print "using a patch program. After applying the patch and resolving the\n";
377 print "problems you may commit using:";
378 print "\n cd \"$opt_w\"" if $opt_w;
380 print "\n git checkout $go_back_to\n" if $go_back_to;
386 print "Autocommit\n $cmd\n";
387 print xargs_safe_pipe_capture([@cvs, 'commit', '-F', '.msg'], @files);
389 die "Exiting: The commit did not succeed";
391 print "Committed successfully to CVS\n";
395 print "Ready for you to commit, just run:\n\n $cmd\n";
399 unlink(".cvsexportcommit.diff");
402 system("git checkout $go_back_to") && die "cannot move back to $go_back_to";
403 if (!($go_back_to =~ /^[0-9a-fA-F]{40}$/)) {
404 system("git symbolic-ref HEAD $go_back_to") &&
405 die "cannot move back to $go_back_to";
409 # CVS version 1.11.x and 1.12.x sleeps the wrong way to ensure the timestamp
410 # used by CVS and the one set by subsequence file modifications are different.
411 # If they are not different CVS will not detect changes.
416 Usage: GIT_DIR=/path/to/.git git cvsexportcommit [-h] [-p] [-v] [-c] [-f] [-u] [-k] [-w cvsworkdir] [-m msgprefix] [ parent ] commit
421 # An alternative to `command` that allows input to be passed as an array
422 # to work around shell problems with weird characters in arguments
423 # if the exec returns non-zero we die
424 sub safe_pipe_capture {
426 if (my $pid = open my $child, '-|') {
427 @output = (<$child>);
428 close $child or die join(' ',@_).": $! $?";
430 exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
432 return wantarray ? @output : join('',@output);
435 sub xargs_safe_pipe_capture {
436 my $MAX_ARG_LENGTH = 65536;
443 while(@_ && $length < $MAX_ARG_LENGTH) {
445 $length += length($args[$#args]);
448 push @output, safe_pipe_capture(@$cmd, @args);
451 $output .= safe_pipe_capture(@$cmd, @args);
454 return wantarray ? @output : $output;