2 # This is a generic update/post-receive hook script for GIT repositories.
3 # Written by Martin Mares <mj@ucw.cz> and placed into public domain.
14 my $subject_prefix = "GIT";
18 'mail-to=s' => \$mail_to,
19 'subject-prefix=s' => \$subject_prefix,
20 'max-diff-size=s' => \$max_diff_size,
21 ) and (@ARGV == 3 || !@ARGV) or die <<AMEN ;
22 Usage as update hook: $0 [<options>] <refname> <sha1-old> <sha1-new>
23 Usage as post-receive hook: $0 [<options>]
26 --mail-to=<address> Send mail to the given address
27 --max-diff-size=<bytes> If the diff is too long, send just a summary
28 --subject-prefix=<px> Prefix subjects with [<px>] (default: GIT)
31 my $repo = POSIX::getcwd();
34 my @rev_list_options = ('--pretty', '--no-abbrev', '--date=iso');
35 my @diff_options = ('-C');
39 open ORIG_STDIN, '<&', \*STDIN;
40 open ORIG_STDOUT, '>&', \*STDOUT;
43 update_ref($ARGV[0], $ARGV[1], $ARGV[2]);
45 while (<ORIG_STDIN>) {
47 my ($old, $new, $ref) = /^(\S+) (\S+) (.*)/ or die "Error parsing hook input ($_)\n";
48 update_ref($ref, $old, $new);
52 sub scan_branches($$) {
54 # Is there any branch pointing to $new (other than $ref)?
55 for (`git branch -v --no-abbrev`) {
57 my ($name, $sha) = /^..(\S+)\s+(\S+)/ or die;
58 if ((!defined($ref) || $name ne $ref) && $sha eq $new) {
65 sub scan_commits($$) {
68 for (`git rev-list $old..$new --pretty=format:"# %H (%P) %s"`) {
71 my ($hash, $parents, $subject) = m{^# (\S+) \(([^)]*)\) (.*)} or die;
74 parents => [ split /\s+/, $parents ],
83 print STDOUT "Most recent commits:\n\n";
84 system 'git', 'rev-list', @rev_list_options, '--max-count=20', $new;
93 sub update_branch($$$$$)
95 my ($branch, $old, $new, $out, $headers) = @_;
97 my $subj = '[' . $subject_prefix . ($branch eq 'master' ? '' : "/$branch") . ']';
99 # Creation of a branch
100 $subj .= ' Created branch';
101 my $copy_of = scan_branches($branch, $new);
102 if (defined $copy_of) {
103 $subj .= " as a copy of $copy_of";
104 print $out "Created branch $branch as a copy of $copy_of ($new).\n";
106 print $out "Created branch $branch ($new).\n\n";
109 } elsif ($new =~ /^0+$/) {
110 # Deletion of a branch
111 $subj .= ' Branch deleted';
112 print $out "Deleted branch $branch ($old).\n";
114 my $lca = `git merge-base $old $new`; die if $?;
117 # Fast forward ... scan all objects
118 my @commits = scan_commits($old, $new);
119 my @nonmerges = grep { @{$_->{parents}} == 1 } @commits;
123 # Try to recognize simple merges and display them as such
124 my $c0 = $commits[0];
125 my $n0 = $nonmerges[0];
126 my $c0p = $c0->{parents};
129 ($c0p->[0] eq $old || $c0p->[1] eq $old) &&
131 $c0->{subject} =~ m{^\s*Merge branch '([^']*)' into (\S+)} &&
132 ($1 eq $branch) != ($2 eq $branch)
134 $c0->{subject} =~ m{^\s*Merge branch '([^']*)'( of |$)}
136 # Pushed a merge of the current branch with another local branch
137 $subj .= ' ' . $c0->{subject};
139 # Otherwise take the subject of the first non-merge commit
140 $subj .= ' ' . $n0->{subject};
142 # If there is none, take the first merge
143 $subj .= ' ' . $c0->{subject};
146 print $out "Push to branch $branch ($old..$new)\n\n";
148 # If there are multiple commits, mention that
149 if (@nonmerges > 1) {
150 $subj .= ' [' . (scalar @commits) . ' commits]';
151 print $out 'Pushed ', (scalar @commits), " commits. Overall diffstat:\n\n";
154 # Print an overall diffstat
155 system 'git', 'diff', '--stat', $old, $new;
157 my $pos_after_header = output_size($out);
159 # Show individual commits with diffs
160 system 'git', 'log', @rev_list_options, @diff_options, '-p', "$old..$new";
162 # If the file is too long, truncate it and print just a summary
163 if (defined($max_diff_size) && output_size($out) > $max_diff_size) {
164 $out->truncate($pos_after_header);
166 print $out "Diff was too long, printing just a summary.\n\n";
167 system 'git', 'log', @rev_list_options, "$old..$new";
169 } elsif ($lca eq $new) {
171 $subj .= ' Branch rewound';
172 print $out "Rewound branch $branch ($old..$new).\n\n";
175 # Otherwise it is a rebase
176 $subj .= ' Branch rebased';
177 print $out "Rebased branch $branch ($old..$new).\n\n";
178 print $out "Commits from common ancestor:\n\n";
179 system 'git', 'rev-list', @rev_list_options, $new, "^$old";
183 $headers->{'Subject'} = $subj;
184 $headers->{'X-Git-Branch'} = $branch;
188 sub update_tag($$$$$)
190 my ($tag, $old, $new, $out, $headers) = @_;
192 my $subj = '[' . $subject_prefix . ']';
193 if ($new =~ /^0+$/) {
194 $subj .= " Deleted tag $tag";
195 print $out "Deleted tag $tag ($old).\n";
197 my $copy_of = scan_branches(undef, $new);
198 my $cp = defined($copy_of) ? " to branch $copy_of" : "";
200 $subj .= " Created tag $tag$cp";
201 print $out "Created tag $tag$cp ($new).\n\n";
203 $subj .= " Changed tag $tag$cp";
204 print $out "Changed tag $tag$cp ($old..$new).\n\n";
209 $headers->{'Subject'} = $subj;
210 $headers->{'X-Git-Tag'} = $tag;
216 my ($ref, $old, $new) = @_;
217 $old ne $new or return;
218 my ($type, $name) = ($ref =~ m{^refs/([^/]*)/(.*)}) or return;
220 my $out = File::Temp->new() or die;
221 my $outname = $out->filename;
224 open STDOUT, '>&', $out or die;
227 'X-Git-Repo' => $repo,
228 'X-Git-Old-SHA' => $old,
229 'X-Git-New-SHA' => $new,
233 if ($type eq 'heads') { $send = update_branch($name, $old, $new, $out, $headers); }
234 elsif ($type eq 'tags') { $send = update_tag($name, $old, $new, $out, $headers); }
238 if (defined $mail_to) {
240 open STDIN, '<', $outname;
245 '-e', 'set charset="utf-8"',
246 '-e', 'set send_charset="us-ascii:iso-8859-2:utf-8"',
247 '-s', $headers->{'Subject'},
249 delete $headers->{'Subject'};
250 push @mutt, map { ('-e', "my_hdr $_: " . $headers->{$_}) } keys %$headers;
251 system @mutt, $mail_to;
253 open STDOUT, '>&', \*ORIG_STDOUT;
254 print map { "$_: " . $headers->{$_} . "\n" } sort keys %$headers;
256 system 'cat', $outname;