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5e0306ad ML |
1 | #!/usr/bin/perl -w |
2 | ||
3 | use strict; | |
4 | use Getopt::Std; | |
5 | use File::Temp qw(tempdir); | |
6 | use Data::Dumper; | |
27dedf0c | 7 | use File::Basename qw(basename); |
5e0306ad ML |
8 | |
9 | unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){ | |
10 | die "GIT_DIR is not defined or is unreadable"; | |
11 | } | |
12 | ||
13 | our ($opt_h, $opt_p, $opt_v, $opt_c ); | |
14 | ||
27dedf0c | 15 | getopts('hpvc'); |
5e0306ad ML |
16 | |
17 | $opt_h && usage(); | |
18 | ||
19 | die "Need at least one commit identifier!" unless @ARGV; | |
20 | ||
21 | # setup a tempdir | |
22 | our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX', | |
23 | TMPDIR => 1, | |
24 | CLEANUP => 1); | |
25 | ||
26 | print Dumper(@ARGV); | |
27 | # resolve target commit | |
28 | my $commit; | |
29 | $commit = pop @ARGV; | |
30 | $commit = `git-rev-parse --verify "$commit"^0`; | |
31 | chomp $commit; | |
32 | if ($?) { | |
33 | die "The commit reference $commit did not resolve!"; | |
34 | } | |
35 | ||
36 | # resolve what parent we want | |
37 | my $parent; | |
38 | if (@ARGV) { | |
39 | $parent = pop @ARGV; | |
40 | $parent = `git-rev-parse --verify "$parent"^0"`; | |
41 | chomp $parent; | |
42 | if ($?) { | |
43 | die "The parent reference did not resolve!"; | |
44 | } | |
45 | } | |
46 | ||
47 | # find parents from the commit itself | |
48 | my @commit = `git-cat-file commit $commit`; | |
49 | my @parents; | |
50 | foreach my $p (@commit) { | |
51 | if ($p =~ m/^$/) { # end of commit headers, we're done | |
52 | last; | |
53 | } | |
54 | if ($p =~ m/^parent (\w{40})$/) { # found a parent | |
55 | push @parents, $1; | |
56 | } | |
57 | } | |
58 | ||
59 | if ($parent) { | |
60 | # double check that it's a valid parent | |
61 | foreach my $p (@parents) { | |
62 | my $found; | |
63 | if ($p eq $parent) { | |
64 | $found = 1; | |
65 | last; | |
66 | }; # found it | |
67 | die "Did not find $parent in the parents for this commit!"; | |
e09f5d7b | 68 | } |
5e0306ad ML |
69 | } else { # we don't have a parent from the cmdline... |
70 | if (@parents == 1) { # it's safe to get it from the commit | |
71 | $parent = $parents[0]; | |
72 | } else { # or perhaps not! | |
73 | die "This commit has more than one parent -- please name the parent you want to use explicitly"; | |
74 | } | |
75 | } | |
76 | ||
77 | $opt_v && print "Applying to CVS commit $commit from parent $parent\n"; | |
78 | ||
79 | # grab the commit message | |
80 | `git-cat-file commit $commit | sed -e '1,/^\$/d' > .msg`; | |
27dedf0c | 81 | $? && die "Error extracting the commit message"; |
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82 | |
83 | my (@afiles, @dfiles, @mfiles); | |
84 | my @files = `git-diff-tree -r $parent $commit`; | |
85 | print @files; | |
86 | $? && die "Error in git-diff-tree"; | |
87 | foreach my $f (@files) { | |
88 | chomp $f; | |
89 | my @fields = split(m/\s+/, $f); | |
90 | if ($fields[4] eq 'A') { | |
91 | push @afiles, $fields[5]; | |
92 | } | |
93 | if ($fields[4] eq 'M') { | |
94 | push @mfiles, $fields[5]; | |
95 | } | |
96 | if ($fields[4] eq 'R') { | |
97 | push @dfiles, $fields[5]; | |
98 | } | |
99 | } | |
100 | $opt_v && print "The commit affects:\n "; | |
101 | $opt_v && print join ("\n ", @afiles,@mfiles,@dfiles) . "\n\n"; | |
102 | undef @files; # don't need it anymore | |
103 | ||
104 | # check that the files are clean and up to date according to cvs | |
105 | my $dirty; | |
106 | foreach my $f (@afiles, @mfiles, @dfiles) { | |
107 | # TODO:we need to handle removed in cvs and/or new (from git) | |
108 | my $status = `cvs -q status "$f" | grep '^File: '`; | |
109 | ||
110 | unless ($status =~ m/Status: Up-to-date$/) { | |
111 | $dirty = 1; | |
112 | warn "File $f not up to date in your CVS checkout!\n"; | |
113 | } | |
114 | } | |
115 | if ($dirty) { | |
116 | die "Exiting: your CVS tree is not clean for this merge."; | |
117 | } | |
118 | ||
119 | ### | |
120 | ### NOTE: if you are planning to die() past this point | |
121 | ### you MUST call cleanupcvs(@files) before die() | |
122 | ### | |
123 | ||
124 | ||
125 | print "'Patching' binary files\n"; | |
126 | ||
127 | my @bfiles = `git-diff-tree -p $parent $commit | grep '^Binary'`; | |
128 | @bfiles = map { chomp } @bfiles; | |
129 | foreach my $f (@bfiles) { | |
130 | # check that the file in cvs matches the "old" file | |
131 | # extract the file to $tmpdir and comparre with cmp | |
132 | my $tree = `git-rev-parse $parent^{tree} `; | |
133 | chomp $tree; | |
134 | my $blob = `git-ls-tree $tree "$f" | cut -f 1 | cut -d ' ' -f 3`; | |
135 | chomp $blob; | |
136 | `git-cat-file blob $blob > $tmpdir/blob`; | |
137 | `cmp -q $f $tmpdir/blob`; | |
138 | if ($?) { | |
139 | warn "Binary file $f in CVS does not match parent.\n"; | |
140 | $dirty = 1; | |
141 | next; | |
142 | } | |
143 | ||
144 | # replace with the new file | |
145 | `git-cat-file blob $blob > $f`; | |
146 | ||
147 | # TODO: something smart with file modes | |
148 | ||
149 | } | |
150 | if ($dirty) { | |
151 | cleanupcvs(@files); | |
152 | die "Exiting: Binary files in CVS do not match parent"; | |
153 | } | |
154 | ||
155 | ## apply non-binary changes | |
156 | my $fuzz = $opt_p ? 0 : 2; | |
157 | ||
158 | print "Patching non-binary files\n"; | |
159 | print `(git-diff-tree -p $parent -p $commit | patch -p1 -F $fuzz ) 2>&1`; | |
160 | ||
161 | my $dirtypatch = 0; | |
162 | if (($? >> 8) == 2) { | |
163 | cleanupcvs(@files); | |
164 | die "Exiting: Patch reported serious trouble -- you will have to apply this patch manually"; | |
165 | } elsif (($? >> 8) == 1) { # some hunks failed to apply | |
166 | $dirtypatch = 1; | |
167 | } | |
168 | ||
169 | foreach my $f (@afiles) { | |
170 | `cvs add $f`; | |
171 | if ($?) { | |
172 | $dirty = 1; | |
173 | warn "Failed to cvs add $f -- you may need to do it manually"; | |
174 | } | |
175 | } | |
176 | ||
177 | foreach my $f (@dfiles) { | |
178 | `cvs rm -f $f`; | |
179 | if ($?) { | |
180 | $dirty = 1; | |
181 | warn "Failed to cvs rm -f $f -- you may need to do it manually"; | |
182 | } | |
183 | } | |
184 | ||
185 | print "Commit to CVS\n"; | |
186 | my $commitfiles = join(' ', @afiles, @mfiles, @dfiles); | |
187 | my $cmd = "cvs commit -F .msg $commitfiles"; | |
188 | ||
189 | if ($dirtypatch) { | |
190 | print "NOTE: One or more hunks failed to apply cleanly.\n"; | |
27dedf0c | 191 | print "Resolve the conflicts and then commit using:\n"; |
5e0306ad | 192 | print "\n $cmd\n\n"; |
27dedf0c | 193 | exit(1); |
5e0306ad ML |
194 | } |
195 | ||
196 | ||
197 | if ($opt_c) { | |
198 | print "Autocommit\n $cmd\n"; | |
199 | print `cvs commit -F .msg $commitfiles 2>&1`; | |
200 | if ($?) { | |
201 | cleanupcvs(@files); | |
202 | die "Exiting: The commit did not succeed"; | |
203 | } | |
204 | print "Committed successfully to CVS\n"; | |
205 | } else { | |
206 | print "Ready for you to commit, just run:\n\n $cmd\n"; | |
207 | } | |
208 | sub usage { | |
209 | print STDERR <<END; | |
27dedf0c | 210 | Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [ parent ] commit |
5e0306ad ML |
211 | END |
212 | exit(1); | |
213 | } | |
214 | ||
215 | # ensure cvs is clean before we die | |
216 | sub cleanupcvs { | |
217 | my @files = @_; | |
218 | foreach my $f (@files) { | |
219 | `cvs -q update -C "$f"`; | |
220 | if ($?) { | |
221 | warn "Warning! Failed to cleanup state of $f\n"; | |
222 | } | |
223 | } | |
224 | } | |
225 |