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 $repo = POSIX::getcwd();
34 my @rev_list_options = ('--pretty', '--no-abbrev', '--date=iso');
35 my @diff_options = ('-C');
39 open ORIG_STDOUT, '>&', \*STDOUT;
42 update_ref($ARGV[0], $ARGV[1], $ARGV[2]);
46 my ($old, $new, $ref) = /^(\S+) (\S+) (.*)/ or die "Error parsing hook input ($_)\n";
47 update_ref($ref, $old, $new);
51 sub scan_branches($$) {
53 # Is there any branch pointing to $new (other than $ref)?
54 for (`git branch -v --no-abbrev`) {
56 my ($name, $sha) = /^..(\S+)\s+(\S+)/ or die;
57 if ((!defined($ref) || $name ne $ref) && $sha eq $new) {
64 sub scan_commits($$) {
67 for (`git rev-list $old..$new --pretty=format:"# %H (%P) %s"`) {
70 my ($hash, $parents, $subject) = m{^# (\S+) \(([^)]*)\) (.*)} or die;
73 parents => [ split /\s+/, $parents ],
82 print STDOUT "Most recent commits:\n\n";
83 system 'git', 'rev-list', @rev_list_options, '--max-count=20', $new;
92 sub update_branch($$$$$)
94 my ($branch, $old, $new, $out, $headers) = @_;
96 my $subj = '[' . $subject_prefix . ($branch eq 'master' ? '' : "/$branch") . ']';
98 # Creation of a branch
99 $subj .= ' Created branch';
100 my $copy_of = scan_branches($branch, $new);
101 if (defined $copy_of) {
102 $subj .= " as a copy of $copy_of";
103 print $out "Created branch $branch as a copy of $copy_of ($new).\n";
105 print $out "Created branch $branch ($new).\n\n";
108 } elsif ($new =~ /^0+$/) {
109 # Deletion of a branch
110 $subj .= ' Branch deleted';
111 print $out "Deleted branch $branch ($old).\n";
113 my $lca = `git merge-base $old $new`; die if $?;
116 # Fast forward ... scan all objects
117 my @commits = scan_commits($old, $new);
118 my @nonmerges = grep { @{$_->{parents}} == 1 } @commits;
122 # Try to recognize simple merges and display them as such
123 my $c0 = $commits[0];
124 my $n0 = $nonmerges[0];
125 my $c0p = $c0->{parents};
127 ($c0p->[0] eq $old || $c0p->[1] eq $old) &&
128 $c0->{subject} =~ m{^\s*Merge branch '([^']*)' into (\S+)} &&
129 (($1 eq $branch) != ($2 eq $branch))) {
130 # Pushed a merge of the current branch with another local branch
131 $subj .= ' ' . $c0->{subject};
133 # Otherwise take the subject of the first non-merge commit
134 $subj .= ' ' . $n0->{subject};
136 # If there is none, take the first merge
137 $subj .= ' ' . $c0->{subject};
140 print $out "Push to branch $branch ($old -> $new)\n\n";
142 # If there are multiple commits, mention that
143 if (@nonmerges > 1) {
144 $subj .= ' [' . (scalar @commits) . ' commits]';
145 print $out 'Pushed ', (scalar @commits), " commits. Overall diffstat:\n\n";
148 # Print an overall diffstat
149 system 'git', 'diff', '--stat', $old, $new;
151 my $pos_after_header = output_size($out);
153 # Show individual commits with diffs
154 system 'git', 'log', @rev_list_options, @diff_options, '-p', "$old..$new";
156 # If the file is too long, truncate it and print just a summary
157 if (defined($max_diff_size) && output_size($out) > $max_diff_size) {
158 $out->truncate($pos_after_header);
160 print $out "Diff was too long, printing just a summary.\n\n";
161 system 'git', 'log', @rev_list_options, "$old..$new";
163 } elsif ($lca eq $new) {
165 $subj .= ' Branch rewound';
166 print $out "Rewound branch $branch ($old -> $new).\n\n";
169 # Otherwise it is a rebase
170 $subj .= ' Branch rebased';
171 print $out "Rebased branch $branch ($old -> $new).\n\n";
172 print $out "Commits from common ancestor:\n\n";
173 system 'git', 'rev-list', @rev_list_options, $new, "^$old";
177 $headers->{'Subject'} = $subj;
178 $headers->{'X-Git-Branch'} = $branch;
182 sub update_tag($$$$$)
184 my ($tag, $old, $new, $out, $headers) = @_;
186 my $subj = '[' . $subject_prefix . ']';
187 if ($new =~ /^0+$/) {
188 $subj .= " Deleted tag $tag";
189 print $out "Deleted tag $tag ($old).\n";
191 my $copy_of = scan_branches(undef, $new);
192 my $cp = defined($copy_of) ? " to branch $copy_of" : "";
194 $subj .= " Created tag $tag$cp";
195 print $out "Created tag $tag$cp ($new).\n\n";
197 $subj .= " Changed tag $tag$cp";
198 print $out "Changed tag $tag$cp ($old -> $new).\n\n";
203 $headers->{'Subject'} = $subj;
204 $headers->{'X-Git-Tag'} = $tag;
210 my ($ref, $old, $new) = @_;
211 $old ne $new or return;
212 my ($type, $name) = ($ref =~ m{^refs/([^/]*)/(.*)}) or return;
214 my $out = File::Temp->new() or die;
215 my $outname = $out->filename;
218 open STDOUT, '>&', $out or die;
221 'X-Git-Repo' => $repo,
222 'X-Git-Old-SHA' => $old,
223 'X-Git-New-SHA' => $new,
227 if ($type eq 'heads') { $send = update_branch($name, $old, $new, $out, $headers); }
228 elsif ($type eq 'tags') { $send = update_tag($name, $old, $new, $out, $headers); }
232 if (defined $mail_to) {
234 open STDIN, '<', $outname;
239 '-e', 'set charset="utf-8"',
240 '-e', 'set send_charset="us-ascii:iso-8859-2:utf-8"',
241 '-s', $headers->{'Subject'},
243 delete $headers->{'Subject'};
244 push @mutt, map { ('-e', "my_hdr $_: " . $headers->{$_}) } keys %$headers;
245 system @mutt, $mail_to;
247 open STDOUT, '>&', \*ORIG_STDOUT;
248 print map { "$_: " . $headers->{$_} . "\n" } sort keys %$headers;
250 system 'cat', $outname;