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Commit | Line | Data |
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5e0306ad ML |
1 | #!/usr/bin/perl -w |
2 | ||
0d71b31a YD |
3 | # Known limitations: |
4 | # - cannot add or remove binary files | |
0d71b31a YD |
5 | # - does not propagate permissions |
6 | # - tells "ready for commit" even when things could not be completed | |
7 | # (eg addition of a binary file) | |
8 | ||
5e0306ad ML |
9 | use strict; |
10 | use Getopt::Std; | |
11 | use File::Temp qw(tempdir); | |
12 | use Data::Dumper; | |
3f0f756b | 13 | use File::Basename qw(basename dirname); |
5e0306ad ML |
14 | |
15 | unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){ | |
16 | die "GIT_DIR is not defined or is unreadable"; | |
17 | } | |
18 | ||
1b91abe3 | 19 | our ($opt_h, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m ); |
5e0306ad | 20 | |
1b91abe3 | 21 | getopts('hpvcfam:'); |
5e0306ad ML |
22 | |
23 | $opt_h && usage(); | |
24 | ||
25 | die "Need at least one commit identifier!" unless @ARGV; | |
26 | ||
27 | # setup a tempdir | |
28 | our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX', | |
29 | TMPDIR => 1, | |
30 | CLEANUP => 1); | |
31 | ||
5e0306ad ML |
32 | # resolve target commit |
33 | my $commit; | |
34 | $commit = pop @ARGV; | |
d41df15e | 35 | $commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0"); |
5e0306ad ML |
36 | chomp $commit; |
37 | if ($?) { | |
38 | die "The commit reference $commit did not resolve!"; | |
39 | } | |
40 | ||
41 | # resolve what parent we want | |
42 | my $parent; | |
43 | if (@ARGV) { | |
44 | $parent = pop @ARGV; | |
d41df15e | 45 | $parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0"); |
5e0306ad ML |
46 | chomp $parent; |
47 | if ($?) { | |
48 | die "The parent reference did not resolve!"; | |
49 | } | |
50 | } | |
51 | ||
52 | # find parents from the commit itself | |
d41df15e | 53 | my @commit = safe_pipe_capture('git-cat-file', 'commit', $commit); |
5e0306ad | 54 | my @parents; |
1b91abe3 ML |
55 | my $committer; |
56 | my $author; | |
57 | my $stage = 'headers'; # headers, msg | |
58 | my $title; | |
59 | my $msg = ''; | |
60 | ||
61 | foreach my $line (@commit) { | |
62 | chomp $line; | |
63 | if ($stage eq 'headers' && $line eq '') { | |
64 | $stage = 'msg'; | |
65 | next; | |
5e0306ad | 66 | } |
1b91abe3 ML |
67 | |
68 | if ($stage eq 'headers') { | |
69 | if ($line =~ m/^parent (\w{40})$/) { # found a parent | |
70 | push @parents, $1; | |
71 | } elsif ($line =~ m/^author (.+) \d+ \+\d+$/) { | |
72 | $author = $1; | |
73 | } elsif ($line =~ m/^committer (.+) \d+ \+\d+$/) { | |
74 | $committer = $1; | |
75 | } | |
76 | } else { | |
77 | $msg .= $line . "\n"; | |
78 | unless ($title) { | |
79 | $title = $line; | |
80 | } | |
5e0306ad ML |
81 | } |
82 | } | |
83 | ||
84 | if ($parent) { | |
135a522e | 85 | my $found; |
5e0306ad ML |
86 | # double check that it's a valid parent |
87 | foreach my $p (@parents) { | |
5e0306ad ML |
88 | if ($p eq $parent) { |
89 | $found = 1; | |
90 | last; | |
91 | }; # found it | |
e09f5d7b | 92 | } |
135a522e | 93 | die "Did not find $parent in the parents for this commit!" if !$found; |
5e0306ad ML |
94 | } else { # we don't have a parent from the cmdline... |
95 | if (@parents == 1) { # it's safe to get it from the commit | |
96 | $parent = $parents[0]; | |
97 | } else { # or perhaps not! | |
98 | die "This commit has more than one parent -- please name the parent you want to use explicitly"; | |
99 | } | |
100 | } | |
101 | ||
102 | $opt_v && print "Applying to CVS commit $commit from parent $parent\n"; | |
103 | ||
104 | # grab the commit message | |
992793c8 | 105 | open(MSG, ">.msg") or die "Cannot open .msg for writing"; |
1b91abe3 ML |
106 | if ($opt_m) { |
107 | print MSG $opt_m; | |
108 | } | |
109 | print MSG $msg; | |
110 | if ($opt_a) { | |
111 | print MSG "\n\nAuthor: $author\n"; | |
112 | if ($author ne $committer) { | |
113 | print MSG "Committer: $committer\n"; | |
114 | } | |
115 | } | |
992793c8 ML |
116 | close MSG; |
117 | ||
3f0f756b | 118 | my (@afiles, @dfiles, @mfiles, @dirs); |
d41df15e | 119 | my @files = safe_pipe_capture('git-diff-tree', '-r', $parent, $commit); |
992793c8 | 120 | #print @files; |
5e0306ad ML |
121 | $? && die "Error in git-diff-tree"; |
122 | foreach my $f (@files) { | |
123 | chomp $f; | |
d41df15e | 124 | my @fields = split(m!\s+!, $f); |
5e0306ad | 125 | if ($fields[4] eq 'A') { |
3f0f756b YD |
126 | my $path = $fields[5]; |
127 | push @afiles, $path; | |
128 | # add any needed parent directories | |
129 | $path = dirname $path; | |
130 | while (!-d $path and ! grep { $_ eq $path } @dirs) { | |
131 | unshift @dirs, $path; | |
132 | $path = dirname $path; | |
133 | } | |
5e0306ad ML |
134 | } |
135 | if ($fields[4] eq 'M') { | |
136 | push @mfiles, $fields[5]; | |
137 | } | |
138 | if ($fields[4] eq 'R') { | |
139 | push @dfiles, $fields[5]; | |
140 | } | |
141 | } | |
142 | $opt_v && print "The commit affects:\n "; | |
143 | $opt_v && print join ("\n ", @afiles,@mfiles,@dfiles) . "\n\n"; | |
144 | undef @files; # don't need it anymore | |
145 | ||
146 | # check that the files are clean and up to date according to cvs | |
147 | my $dirty; | |
3f0f756b YD |
148 | foreach my $d (@dirs) { |
149 | if (-e $d) { | |
150 | $dirty = 1; | |
151 | warn "$d exists and is not a directory!\n"; | |
152 | } | |
153 | } | |
576cfc86 | 154 | foreach my $f (@afiles) { |
d41df15e ML |
155 | # This should return only one value |
156 | my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f)); | |
157 | if (@status > 1) { warn 'Strange! cvs status returned more than one line?'}; | |
3f0f756b YD |
158 | if (-d dirname $f and $status[0] !~ m/Status: Unknown$/ |
159 | and $status[0] !~ m/^File: no file /) { | |
d41df15e | 160 | $dirty = 1; |
992793c8 | 161 | 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"; |
e9687515 | 162 | warn "Status was: $status[0]\n"; |
576cfc86 YD |
163 | } |
164 | } | |
165 | foreach my $f (@mfiles, @dfiles) { | |
166 | # TODO:we need to handle removed in cvs | |
d41df15e ML |
167 | my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f)); |
168 | if (@status > 1) { warn 'Strange! cvs status returned more than one line?'}; | |
169 | unless ($status[0] =~ m/Status: Up-to-date$/) { | |
5e0306ad ML |
170 | $dirty = 1; |
171 | warn "File $f not up to date in your CVS checkout!\n"; | |
172 | } | |
173 | } | |
174 | if ($dirty) { | |
992793c8 ML |
175 | if ($opt_f) { warn "The tree is not clean -- forced merge\n"; |
176 | $dirty = 0; | |
177 | } else { | |
178 | die "Exiting: your CVS tree is not clean for this merge."; | |
179 | } | |
5e0306ad ML |
180 | } |
181 | ||
182 | ### | |
183 | ### NOTE: if you are planning to die() past this point | |
184 | ### you MUST call cleanupcvs(@files) before die() | |
185 | ### | |
186 | ||
187 | ||
3f0f756b YD |
188 | print "Creating new directories\n"; |
189 | foreach my $d (@dirs) { | |
190 | unless (mkdir $d) { | |
191 | warn "Could not mkdir $d: $!"; | |
192 | $dirty = 1; | |
193 | } | |
194 | `cvs add $d`; | |
195 | if ($?) { | |
196 | $dirty = 1; | |
197 | warn "Failed to cvs add directory $d -- you may need to do it manually"; | |
198 | } | |
199 | } | |
200 | ||
5e0306ad ML |
201 | print "'Patching' binary files\n"; |
202 | ||
d41df15e | 203 | my @bfiles = grep(m/^Binary/, safe_pipe_capture('git-diff-tree', '-p', $parent, $commit)); |
5e0306ad ML |
204 | @bfiles = map { chomp } @bfiles; |
205 | foreach my $f (@bfiles) { | |
206 | # check that the file in cvs matches the "old" file | |
82e5a82f | 207 | # extract the file to $tmpdir and compare with cmp |
d41df15e | 208 | my $tree = safe_pipe_capture('git-rev-parse', "$parent^{tree}"); |
5e0306ad ML |
209 | chomp $tree; |
210 | my $blob = `git-ls-tree $tree "$f" | cut -f 1 | cut -d ' ' -f 3`; | |
211 | chomp $blob; | |
212 | `git-cat-file blob $blob > $tmpdir/blob`; | |
ff4a9ceb | 213 | if (system('cmp', '-s', $f, "$tmpdir/blob")) { |
5e0306ad ML |
214 | warn "Binary file $f in CVS does not match parent.\n"; |
215 | $dirty = 1; | |
216 | next; | |
217 | } | |
218 | ||
219 | # replace with the new file | |
220 | `git-cat-file blob $blob > $f`; | |
221 | ||
222 | # TODO: something smart with file modes | |
223 | ||
224 | } | |
225 | if ($dirty) { | |
226 | cleanupcvs(@files); | |
227 | die "Exiting: Binary files in CVS do not match parent"; | |
228 | } | |
229 | ||
230 | ## apply non-binary changes | |
231 | my $fuzz = $opt_p ? 0 : 2; | |
232 | ||
233 | print "Patching non-binary files\n"; | |
234 | print `(git-diff-tree -p $parent -p $commit | patch -p1 -F $fuzz ) 2>&1`; | |
235 | ||
236 | my $dirtypatch = 0; | |
237 | if (($? >> 8) == 2) { | |
238 | cleanupcvs(@files); | |
239 | die "Exiting: Patch reported serious trouble -- you will have to apply this patch manually"; | |
240 | } elsif (($? >> 8) == 1) { # some hunks failed to apply | |
241 | $dirtypatch = 1; | |
242 | } | |
243 | ||
244 | foreach my $f (@afiles) { | |
d41df15e | 245 | system('cvs', 'add', $f); |
5e0306ad ML |
246 | if ($?) { |
247 | $dirty = 1; | |
248 | warn "Failed to cvs add $f -- you may need to do it manually"; | |
249 | } | |
250 | } | |
251 | ||
252 | foreach my $f (@dfiles) { | |
d41df15e | 253 | system('cvs', 'rm', '-f', $f); |
5e0306ad ML |
254 | if ($?) { |
255 | $dirty = 1; | |
256 | warn "Failed to cvs rm -f $f -- you may need to do it manually"; | |
257 | } | |
258 | } | |
259 | ||
260 | print "Commit to CVS\n"; | |
1b91abe3 | 261 | print "Patch: $title\n"; |
5e0306ad ML |
262 | my $commitfiles = join(' ', @afiles, @mfiles, @dfiles); |
263 | my $cmd = "cvs commit -F .msg $commitfiles"; | |
264 | ||
265 | if ($dirtypatch) { | |
266 | print "NOTE: One or more hunks failed to apply cleanly.\n"; | |
27dedf0c | 267 | print "Resolve the conflicts and then commit using:\n"; |
5e0306ad | 268 | print "\n $cmd\n\n"; |
27dedf0c | 269 | exit(1); |
5e0306ad ML |
270 | } |
271 | ||
272 | ||
273 | if ($opt_c) { | |
274 | print "Autocommit\n $cmd\n"; | |
d41df15e | 275 | print safe_pipe_capture('cvs', 'commit', '-F', '.msg', @afiles, @mfiles, @dfiles); |
5e0306ad ML |
276 | if ($?) { |
277 | cleanupcvs(@files); | |
278 | die "Exiting: The commit did not succeed"; | |
279 | } | |
280 | print "Committed successfully to CVS\n"; | |
281 | } else { | |
282 | print "Ready for you to commit, just run:\n\n $cmd\n"; | |
283 | } | |
284 | sub usage { | |
285 | print STDERR <<END; | |
992793c8 | 286 | Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [-f] [-m msgprefix] [ parent ] commit |
5e0306ad ML |
287 | END |
288 | exit(1); | |
289 | } | |
290 | ||
291 | # ensure cvs is clean before we die | |
292 | sub cleanupcvs { | |
293 | my @files = @_; | |
294 | foreach my $f (@files) { | |
d41df15e | 295 | system('cvs', '-q', 'update', '-C', $f); |
5e0306ad ML |
296 | if ($?) { |
297 | warn "Warning! Failed to cleanup state of $f\n"; | |
298 | } | |
299 | } | |
300 | } | |
301 | ||
82e5a82f | 302 | # An alternative to `command` that allows input to be passed as an array |
d41df15e ML |
303 | # to work around shell problems with weird characters in arguments |
304 | # if the exec returns non-zero we die | |
305 | sub safe_pipe_capture { | |
306 | my @output; | |
307 | if (my $pid = open my $child, '-|') { | |
308 | @output = (<$child>); | |
309 | close $child or die join(' ',@_).": $! $?"; | |
310 | } else { | |
311 | exec(@_) or die "$! $?"; # exec() can fail the executable can't be found | |
312 | } | |
313 | return wantarray ? @output : join('',@output); | |
314 | } |