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1 | #!/usr/bin/perl | |
2 | ||
3 | use 5.008; | |
4 | use strict; | |
5 | use warnings; | |
6 | use Getopt::Std; | |
7 | use File::Temp qw(tempdir); | |
8 | use Data::Dumper; | |
9 | use File::Basename qw(basename dirname); | |
10 | use File::Spec; | |
11 | use Git; | |
12 | ||
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); | |
14 | ||
15 | getopts('uhPpvcfkam:d:w:W'); | |
16 | ||
17 | $opt_h && usage(); | |
18 | ||
19 | die "Need at least one commit identifier!" unless @ARGV; | |
20 | ||
21 | # Get git-config settings | |
22 | my $repo = Git->repository(); | |
23 | $opt_w = $repo->config('cvsexportcommit.cvsdir') unless defined $opt_w; | |
24 | ||
25 | my $tmpdir = File::Temp::tempdir(CLEANUP => 1); | |
26 | my $hash_algo = $repo->config('extensions.objectformat') || 'sha1'; | |
27 | my $hexsz = $hash_algo eq 'sha256' ? 64 : 40; | |
28 | ||
29 | if ($opt_w || $opt_W) { | |
30 | # Remember where GIT_DIR is before changing to CVS checkout | |
31 | unless ($ENV{GIT_DIR}) { | |
32 | # No GIT_DIR set. Figure it out for ourselves | |
33 | my $gd =`git rev-parse --git-dir`; | |
34 | chomp($gd); | |
35 | $ENV{GIT_DIR} = $gd; | |
36 | } | |
37 | ||
38 | # On MSYS, convert a Windows-style path to an MSYS-style path | |
39 | # so that rel2abs() below works correctly. | |
40 | if ($^O eq 'msys') { | |
41 | $ENV{GIT_DIR} =~ s#^([[:alpha:]]):/#/$1/#; | |
42 | } | |
43 | ||
44 | # Make sure GIT_DIR is absolute | |
45 | $ENV{GIT_DIR} = File::Spec->rel2abs($ENV{GIT_DIR}); | |
46 | } | |
47 | ||
48 | if ($opt_w) { | |
49 | if (! -d $opt_w."/CVS" ) { | |
50 | die "$opt_w is not a CVS checkout"; | |
51 | } | |
52 | chdir $opt_w or die "Cannot change to CVS checkout at $opt_w"; | |
53 | } | |
54 | unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){ | |
55 | die "GIT_DIR is not defined or is unreadable"; | |
56 | } | |
57 | ||
58 | ||
59 | my @cvs; | |
60 | if ($opt_d) { | |
61 | @cvs = ('cvs', '-d', $opt_d); | |
62 | } else { | |
63 | @cvs = ('cvs'); | |
64 | } | |
65 | ||
66 | # resolve target commit | |
67 | my $commit; | |
68 | $commit = pop @ARGV; | |
69 | $commit = safe_pipe_capture('git', 'rev-parse', '--verify', "$commit^0"); | |
70 | chomp $commit; | |
71 | if ($?) { | |
72 | die "The commit reference $commit did not resolve!"; | |
73 | } | |
74 | ||
75 | # resolve what parent we want | |
76 | my $parent; | |
77 | if (@ARGV) { | |
78 | $parent = pop @ARGV; | |
79 | $parent = safe_pipe_capture('git', 'rev-parse', '--verify', "$parent^0"); | |
80 | chomp $parent; | |
81 | if ($?) { | |
82 | die "The parent reference did not resolve!"; | |
83 | } | |
84 | } | |
85 | ||
86 | # find parents from the commit itself | |
87 | my @commit = safe_pipe_capture('git', 'cat-file', 'commit', $commit); | |
88 | my @parents; | |
89 | my $committer; | |
90 | my $author; | |
91 | my $stage = 'headers'; # headers, msg | |
92 | my $title; | |
93 | my $msg = ''; | |
94 | ||
95 | foreach my $line (@commit) { | |
96 | chomp $line; | |
97 | if ($stage eq 'headers' && $line eq '') { | |
98 | $stage = 'msg'; | |
99 | next; | |
100 | } | |
101 | ||
102 | if ($stage eq 'headers') { | |
103 | if ($line =~ m/^parent ([0-9a-f]{$hexsz})$/) { # found a parent | |
104 | push @parents, $1; | |
105 | } elsif ($line =~ m/^author (.+) \d+ [-+]\d+$/) { | |
106 | $author = $1; | |
107 | } elsif ($line =~ m/^committer (.+) \d+ [-+]\d+$/) { | |
108 | $committer = $1; | |
109 | } | |
110 | } else { | |
111 | $msg .= $line . "\n"; | |
112 | unless ($title) { | |
113 | $title = $line; | |
114 | } | |
115 | } | |
116 | } | |
117 | ||
118 | my $noparent = "0" x $hexsz; | |
119 | if ($parent) { | |
120 | my $found; | |
121 | # double check that it's a valid parent | |
122 | foreach my $p (@parents) { | |
123 | if ($p eq $parent) { | |
124 | $found = 1; | |
125 | last; | |
126 | }; # found it | |
127 | } | |
128 | die "Did not find $parent in the parents for this commit!" if !$found and !$opt_P; | |
129 | } else { # we don't have a parent from the cmdline... | |
130 | if (@parents == 1) { # it's safe to get it from the commit | |
131 | $parent = $parents[0]; | |
132 | } elsif (@parents == 0) { # there is no parent | |
133 | $parent = $noparent; | |
134 | } else { # cannot choose automatically from multiple parents | |
135 | die "This commit has more than one parent -- please name the parent you want to use explicitly"; | |
136 | } | |
137 | } | |
138 | ||
139 | my $go_back_to = 0; | |
140 | ||
141 | if ($opt_W) { | |
142 | $opt_v && print "Resetting to $parent\n"; | |
143 | $go_back_to = `git symbolic-ref HEAD 2> /dev/null || | |
144 | git rev-parse HEAD` || die "Could not determine current branch"; | |
145 | system("git checkout -q $parent^0") && die "Could not check out $parent^0"; | |
146 | } | |
147 | ||
148 | $opt_v && print "Applying to CVS commit $commit from parent $parent\n"; | |
149 | ||
150 | # grab the commit message | |
151 | open(MSG, ">.msg") or die "Cannot open .msg for writing"; | |
152 | if ($opt_m) { | |
153 | print MSG $opt_m; | |
154 | } | |
155 | print MSG $msg; | |
156 | if ($opt_a) { | |
157 | print MSG "\n\nAuthor: $author\n"; | |
158 | if ($author ne $committer) { | |
159 | print MSG "Committer: $committer\n"; | |
160 | } | |
161 | } | |
162 | close MSG; | |
163 | ||
164 | if ($parent eq $noparent) { | |
165 | `git diff-tree --binary -p --root $commit >.cvsexportcommit.diff`;# || die "Cannot diff"; | |
166 | } else { | |
167 | `git diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff"; | |
168 | } | |
169 | ||
170 | ## apply non-binary changes | |
171 | ||
172 | # In pedantic mode require all lines of context to match. In normal | |
173 | # mode, be compatible with diff/patch: assume 3 lines of context and | |
174 | # require at least one line match, i.e. ignore at most 2 lines of | |
175 | # context, like diff/patch do by default. | |
176 | my $context = $opt_p ? '' : '-C1'; | |
177 | ||
178 | print "Checking if patch will apply\n"; | |
179 | ||
180 | my @stat; | |
181 | open APPLY, "GIT_INDEX_FILE=$tmpdir/index git apply $context --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch"; | |
182 | @stat=<APPLY>; | |
183 | close APPLY || die "Cannot patch"; | |
184 | my (@bfiles,@files,@afiles,@dfiles); | |
185 | chomp @stat; | |
186 | foreach (@stat) { | |
187 | push (@bfiles,$1) if m/^-\t-\t(.*)$/; | |
188 | push (@files, $1) if m/^-\t-\t(.*)$/; | |
189 | push (@files, $1) if m/^\d+\t\d+\t(.*)$/; | |
190 | push (@afiles,$1) if m/^ create mode [0-7]+ (.*)$/; | |
191 | push (@dfiles,$1) if m/^ delete mode [0-7]+ (.*)$/; | |
192 | } | |
193 | map { s/^"(.*)"$/$1/g } @bfiles,@files; | |
194 | map { s/\\([0-7]{3})/sprintf('%c',oct $1)/eg } @bfiles,@files; | |
195 | ||
196 | # check that the files are clean and up to date according to cvs | |
197 | my $dirty; | |
198 | my @dirs; | |
199 | foreach my $p (@afiles) { | |
200 | my $path = dirname $p; | |
201 | while (!-d $path and ! grep { $_ eq $path } @dirs) { | |
202 | unshift @dirs, $path; | |
203 | $path = dirname $path; | |
204 | } | |
205 | } | |
206 | ||
207 | # ... check dirs, | |
208 | foreach my $d (@dirs) { | |
209 | if (-e $d) { | |
210 | $dirty = 1; | |
211 | warn "$d exists and is not a directory!\n"; | |
212 | } | |
213 | } | |
214 | ||
215 | # ... query status of all files that we have a directory for and parse output of 'cvs status' to %cvsstat. | |
216 | my @canstatusfiles; | |
217 | foreach my $f (@files) { | |
218 | my $path = dirname $f; | |
219 | next if (grep { $_ eq $path } @dirs); | |
220 | push @canstatusfiles, $f; | |
221 | } | |
222 | ||
223 | my %cvsstat; | |
224 | if (@canstatusfiles) { | |
225 | if ($opt_u) { | |
226 | my @updated = xargs_safe_pipe_capture([@cvs, 'update'], @canstatusfiles); | |
227 | print @updated; | |
228 | } | |
229 | # "cvs status" reorders the parameters, notably when there are multiple | |
230 | # arguments with the same basename. So be precise here. | |
231 | ||
232 | my %added = map { $_ => 1 } @afiles; | |
233 | my %todo = map { $_ => 1 } @canstatusfiles; | |
234 | ||
235 | while (%todo) { | |
236 | my @canstatusfiles2 = (); | |
237 | my %fullname = (); | |
238 | foreach my $name (keys %todo) { | |
239 | my $basename = basename($name); | |
240 | ||
241 | # CVS reports files that don't exist in the current revision as | |
242 | # "no file $basename" in its "status" output, so we should | |
243 | # anticipate that. Totally unknown files will have a status | |
244 | # "Unknown". However, if they exist in the Attic, their status | |
245 | # will be "Up-to-date" (this means they were added once but have | |
246 | # been removed). | |
247 | $basename = "no file $basename" if $added{$basename}; | |
248 | ||
249 | $basename =~ s/^\s+//; | |
250 | $basename =~ s/\s+$//; | |
251 | ||
252 | if (!exists($fullname{$basename})) { | |
253 | $fullname{$basename} = $name; | |
254 | push (@canstatusfiles2, $name); | |
255 | delete($todo{$name}); | |
256 | } | |
257 | } | |
258 | my @cvsoutput; | |
259 | @cvsoutput = xargs_safe_pipe_capture([@cvs, 'status'], @canstatusfiles2); | |
260 | foreach my $l (@cvsoutput) { | |
261 | chomp $l; | |
262 | next unless | |
263 | my ($file, $status) = $l =~ /^File:\s+(.*\S)\s+Status: (.*)$/; | |
264 | ||
265 | my $fullname = $fullname{$file}; | |
266 | print STDERR "Huh? Status '$status' reported for unexpected file '$file'\n" | |
267 | unless defined $fullname; | |
268 | ||
269 | # This response means the file does not exist except in | |
270 | # CVS's attic, so set the status accordingly | |
271 | $status = "In-attic" | |
272 | if $file =~ /^no file / | |
273 | && $status eq 'Up-to-date'; | |
274 | ||
275 | $cvsstat{$fullname{$file}} = $status | |
276 | if defined $fullname{$file}; | |
277 | } | |
278 | } | |
279 | } | |
280 | ||
281 | # ... Validate that new files have the correct status | |
282 | foreach my $f (@afiles) { | |
283 | next unless defined(my $stat = $cvsstat{$f}); | |
284 | ||
285 | # This means the file has never been seen before | |
286 | next if $stat eq 'Unknown'; | |
287 | ||
288 | # This means the file has been seen before but was removed | |
289 | next if $stat eq 'In-attic'; | |
290 | ||
291 | $dirty = 1; | |
292 | 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"; | |
293 | warn "Status was: $cvsstat{$f}\n"; | |
294 | } | |
295 | ||
296 | # ... validate known files. | |
297 | foreach my $f (@files) { | |
298 | next if grep { $_ eq $f } @afiles; | |
299 | # TODO:we need to handle removed in cvs | |
300 | unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") { | |
301 | $dirty = 1; | |
302 | warn "File $f not up to date but has status '$cvsstat{$f}' in your CVS checkout!\n"; | |
303 | } | |
304 | ||
305 | # Depending on how your GIT tree got imported from CVS you may | |
306 | # have a conflict between expanded keywords in your CVS tree and | |
307 | # unexpanded keywords in the patch about to be applied. | |
308 | if ($opt_k) { | |
309 | my $orig_file ="$f.orig"; | |
310 | rename $f, $orig_file; | |
311 | open(FILTER_IN, "<$orig_file") or die "Cannot open $orig_file\n"; | |
312 | open(FILTER_OUT, ">$f") or die "Cannot open $f\n"; | |
313 | while (<FILTER_IN>) | |
314 | { | |
315 | my $line = $_; | |
316 | $line =~ s/\$([A-Z][a-z]+):[^\$]+\$/\$$1\$/g; | |
317 | print FILTER_OUT $line; | |
318 | } | |
319 | close FILTER_IN; | |
320 | close FILTER_OUT; | |
321 | } | |
322 | } | |
323 | ||
324 | if ($dirty) { | |
325 | if ($opt_f) { warn "The tree is not clean -- forced merge\n"; | |
326 | $dirty = 0; | |
327 | } else { | |
328 | die "Exiting: your CVS tree is not clean for this merge."; | |
329 | } | |
330 | } | |
331 | ||
332 | print "Applying\n"; | |
333 | if ($opt_W) { | |
334 | system("git checkout -q $commit^0") && die "cannot patch"; | |
335 | } else { | |
336 | `GIT_INDEX_FILE=$tmpdir/index git apply $context --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch"; | |
337 | } | |
338 | ||
339 | print "Patch applied successfully. Adding new files and directories to CVS\n"; | |
340 | my $dirtypatch = 0; | |
341 | ||
342 | # | |
343 | # We have to add the directories in order otherwise we will have | |
344 | # problems when we try and add the sub-directory of a directory we | |
345 | # have not added yet. | |
346 | # | |
347 | # Luckily this is easy to deal with by sorting the directories and | |
348 | # dealing with the shortest ones first. | |
349 | # | |
350 | @dirs = sort { length $a <=> length $b} @dirs; | |
351 | ||
352 | foreach my $d (@dirs) { | |
353 | if (system(@cvs,'add',$d)) { | |
354 | $dirtypatch = 1; | |
355 | warn "Failed to cvs add directory $d -- you may need to do it manually"; | |
356 | } | |
357 | } | |
358 | ||
359 | foreach my $f (@afiles) { | |
360 | if (grep { $_ eq $f } @bfiles) { | |
361 | system(@cvs, 'add','-kb',$f); | |
362 | } else { | |
363 | system(@cvs, 'add', $f); | |
364 | } | |
365 | if ($?) { | |
366 | $dirtypatch = 1; | |
367 | warn "Failed to cvs add $f -- you may need to do it manually"; | |
368 | } | |
369 | } | |
370 | ||
371 | foreach my $f (@dfiles) { | |
372 | system(@cvs, 'rm', '-f', $f); | |
373 | if ($?) { | |
374 | $dirtypatch = 1; | |
375 | warn "Failed to cvs rm -f $f -- you may need to do it manually"; | |
376 | } | |
377 | } | |
378 | ||
379 | print "Commit to CVS\n"; | |
380 | print "Patch title (first comment line): $title\n"; | |
381 | my @commitfiles = map { unless (m/\s/) { '\''.$_.'\''; } else { $_; }; } (@files); | |
382 | my $cmd = join(' ', @cvs)." commit -F .msg @commitfiles"; | |
383 | ||
384 | if ($dirtypatch) { | |
385 | print "NOTE: One or more hunks failed to apply cleanly.\n"; | |
386 | print "You'll need to apply the patch in .cvsexportcommit.diff manually\n"; | |
387 | print "using a patch program. After applying the patch and resolving the\n"; | |
388 | print "problems you may commit using:"; | |
389 | print "\n cd \"$opt_w\"" if $opt_w; | |
390 | print "\n $cmd\n"; | |
391 | print "\n git checkout $go_back_to\n" if $go_back_to; | |
392 | print "\n"; | |
393 | exit(1); | |
394 | } | |
395 | ||
396 | if ($opt_c) { | |
397 | print "Autocommit\n $cmd\n"; | |
398 | print xargs_safe_pipe_capture([@cvs, 'commit', '-F', '.msg'], @files); | |
399 | if ($?) { | |
400 | die "Exiting: The commit did not succeed"; | |
401 | } | |
402 | print "Committed successfully to CVS\n"; | |
403 | # clean up | |
404 | unlink(".msg"); | |
405 | } else { | |
406 | print "Ready for you to commit, just run:\n\n $cmd\n"; | |
407 | } | |
408 | ||
409 | # clean up | |
410 | unlink(".cvsexportcommit.diff"); | |
411 | ||
412 | if ($opt_W) { | |
413 | system("git checkout $go_back_to") && die "cannot move back to $go_back_to"; | |
414 | if (!($go_back_to =~ /^[0-9a-fA-F]{$hexsz}$/)) { | |
415 | system("git symbolic-ref HEAD $go_back_to") && | |
416 | die "cannot move back to $go_back_to"; | |
417 | } | |
418 | } | |
419 | ||
420 | # CVS version 1.11.x and 1.12.x sleeps the wrong way to ensure the timestamp | |
421 | # used by CVS and the one set by subsequence file modifications are different. | |
422 | # If they are not different CVS will not detect changes. | |
423 | sleep(1); | |
424 | ||
425 | sub usage { | |
426 | print STDERR <<END; | |
427 | usage: GIT_DIR=/path/to/.git git cvsexportcommit [-h] [-p] [-v] [-c] [-f] [-u] [-k] [-w cvsworkdir] [-m msgprefix] [ parent ] commit | |
428 | END | |
429 | exit(1); | |
430 | } | |
431 | ||
432 | # An alternative to `command` that allows input to be passed as an array | |
433 | # to work around shell problems with weird characters in arguments | |
434 | # if the exec returns non-zero we die | |
435 | sub safe_pipe_capture { | |
436 | my @output; | |
437 | if (my $pid = open my $child, '-|') { | |
438 | binmode($child, ":crlf"); | |
439 | @output = (<$child>); | |
440 | close $child or die join(' ',@_).": $! $?"; | |
441 | } else { | |
442 | exec(@_) or die "$! $?"; # exec() can fail the executable can't be found | |
443 | } | |
444 | return wantarray ? @output : join('',@output); | |
445 | } | |
446 | ||
447 | sub xargs_safe_pipe_capture { | |
448 | my $MAX_ARG_LENGTH = 65536; | |
449 | my $cmd = shift; | |
450 | my @output; | |
451 | my $output; | |
452 | while(@_) { | |
453 | my @args; | |
454 | my $length = 0; | |
455 | while(@_ && $length < $MAX_ARG_LENGTH) { | |
456 | push @args, shift; | |
457 | $length += length($args[$#args]); | |
458 | } | |
459 | if (wantarray) { | |
460 | push @output, safe_pipe_capture(@$cmd, @args); | |
461 | } | |
462 | else { | |
463 | $output .= safe_pipe_capture(@$cmd, @args); | |
464 | } | |
465 | } | |
466 | return wantarray ? @output : $output; | |
467 | } |