Add git post-receive hook so we can version control it

Changes are not automatically propagated to the server though (yet).

Mind, the existing pre-receive.hook in git doesn't seem to match the
script installed on the git server, needs some updating on both ends.

1 files changed, 290 insertions, 0 deletions

diff --git a/hooks/post-receive.hook b/hooks/post-receive.hook
new file mode 100755
index 0000000..cf1fe56
--- /dev/null
+++ b/hooks/post-receive.hook
@@ -0,0 +1,290 @@
+#!/usr/bin/perl -w
+#
+# Copyright 2005 Alexandre Julliard
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+
+use strict;
+use open ':utf8';
+use Encode 'encode';
+use Cwd 'realpath';
+
+binmode STDIN, ':utf8';
+binmode STDOUT, ':utf8';
+
+sub git_config($);
+sub get_repos_name();
+
+# some parameters you may want to change
+
+# set this to something that takes "-s"
+my $mailer = "/usr/bin/mail";
+
+# debug mode
+my $debug = 0;
+
+# configuration parameters
+
+# base URL of the gitweb repository browser
+my $gitweb_url = "http://cgit.freedesktop.org/gstreamer";
+
+# default repository name
+my $repos_name = get_repos_name();
+
+# max size of diffs in bytes
+my $max_diff_size = 10000;
+
+# address for mail notices
+my $commitlist_address = 'gstreamer-commits@lists.freedesktop.org';
+#my $commitlist_address = "bilboed";
+
+# max number of individual notices before falling back to a single global notice
+my $max_individual_notices = 100;
+
+# format an integer date + timezone as string
+# algorithm taken from git's date.c
+sub format_date($$)
+{
+    my ($time,$tz) = @_;
+
+    if ($tz < 0)
+    {
+        my $minutes = (-$tz / 100) * 60 + (-$tz % 100);
+        $time -= $minutes * 60;
+    }
+    else
+    {
+        my $minutes = ($tz / 100) * 60 + ($tz % 100);
+        $time += $minutes * 60;
+    }
+    return gmtime($time) . sprintf " %+05d", $tz;
+}
+
+# fetch a parameter from the git config file
+sub git_config($)
+{
+    my ($param) = @_;
+
+    open CONFIG, "-|" or exec "git", "config", $param;
+    my $ret = <CONFIG>;
+    chomp $ret if $ret;
+    close CONFIG or $ret = undef;
+    return $ret;
+}
+
+# send an email notification
+sub mail_notification($$$@)
+{
+    my ($name, $subject, $content_type, @text) = @_;
+    $subject = encode("MIME-Q",$subject);
+    if ($debug)
+    {
+        print "---------------------\n";
+        print "To: $name\n";
+        print "Subject: $subject\n";
+        print "Content-Type: $content_type\n";
+        print "\n", join("\n", @text), "\n";
+    }
+    else
+    {
+        my $pid = open MAIL, "|-";
+        return unless defined $pid;
+        if (!$pid)
+        {
+            exec $mailer, "-s", $subject, $name, or die "Cannot exec $mailer";
+        }
+        print MAIL join("\n", @text), "\n";
+        close MAIL;
+    }
+}
+
+# get the default repository name
+sub get_repos_name()
+{
+    my $dir = `git rev-parse --git-dir`;
+    chomp $dir;
+    my $repos = realpath($dir);
+    $repos =~ s/(.*?)((\.git\/)?\.git)$/$1/;
+    $repos =~ s/(.*)\/([^\/]+)\/?$/$2/;
+    return $repos;
+}
+
+# extract the information from a commit or tag object and return a hash containing the various fields
+sub get_object_info($)
+{
+    my $obj = shift;
+    my %info = ();
+    my @log = ();
+    my $do_log = 0;
+
+    open TYPE, "-|" or exec "git", "cat-file", "-t", $obj or die "cannot run git-cat-file";
+    my $type = <TYPE>;
+    chomp $type;
+    close TYPE;
+
+    open OBJ, "-|" or exec "git", "cat-file", $type, $obj or die "cannot run git-cat-file";
+    while (<OBJ>)
+    {
+        chomp;
+        if ($do_log)
+        {
+            last if /^-----BEGIN PGP SIGNATURE-----/;
+            push @log, $_;
+        }
+        elsif (/^(author|committer|tagger) ((.*)(<.*>)) (\d+) ([+-]\d+)$/)
+        {
+            $info{$1} = $2;
+            $info{$1 . "_name"} = $3;
+            $info{$1 . "_email"} = $4;
+            $info{$1 . "_date"} = $5;
+            $info{$1 . "_tz"} = $6;
+        }
+        elsif (/^tag (.*)$/)
+        {
+            $info{"tag"} = $1;
+        }
+        elsif (/^$/) { $do_log = 1; }
+    }
+    close OBJ;
+
+    $info{"type"} = $type;
+    $info{"log"} = \@log;
+    return %info;
+}
+
+# send a commit notice to a mailing list
+sub send_commit_notice($$)
+{
+    my ($ref,$obj) = @_;
+    my %info = get_object_info($obj);
+    my @notice = ();
+    my $subject;
+
+    printf "sending e-mail for $obj\n";
+
+    # TODO normal tags are not identified
+    if ($info{"type"} eq "tag")
+    {
+        push @notice,
+        "Module: $repos_name",
+        "Branch: $ref",
+        "Tag:    $obj",
+        $gitweb_url ? "URL:    $gitweb_url/tag/?id=$obj\n" : "",
+        "Tagger: " . $info{"tagger"},
+        "Date:   " . format_date($info{"tagger_date"},$info{"tagger_tz"}),
+        "",
+        join "\n", @{$info{"log"}};
+        $subject = "Tag " . $info{"tag"} . ": " . ${$info{"log"}}[0];
+    }
+    else
+    {
+        push @notice,
+        "Module: $repos_name",
+        "Branch: $ref",
+        "Commit: $obj",
+        $gitweb_url ? "URL:    $gitweb_url/commit/?id=$obj\n" : "",
+        "Author: " . $info{"author"},
+        "Date:   " . format_date($info{"author_date"},$info{"author_tz"}),
+        "",
+        join "\n", @{$info{"log"}},
+        "",
+        "---",
+        "";
+
+        open STAT, "-|" or exec "git", "diff-tree", "--stat", "-M", "--no-commit-id", $obj or die "cannot exec git-diff-tree";
+        push @notice, join("", <STAT>);
+        close STAT;
+
+        open DIFF, "-|" or exec "git", "diff-tree", "-p", "-M", "--no-commit-id", $obj or die "cannot exec git-diff-tree";
+        my $diff = join( "", <DIFF> );
+        close DIFF;
+
+        if (($max_diff_size == -1) || (length($diff) < $max_diff_size))
+        {
+            push @notice, $diff;
+        }
+        else
+        {
+            push @notice, "Diff:   $gitweb_url/diff/?id=$obj" if $gitweb_url;
+        }
+
+        if ($ref eq 'master')
+        {
+            $subject = $repos_name . ": " . ${$info{"log"}}[0];
+        }
+        else
+        {
+            $subject = "[$ref] " . $repos_name . ": " . ${$info{"log"}}[0];
+        }
+    }
+
+    mail_notification($commitlist_address, $subject, "text/plain; charset=UTF-8", @notice);
+}
+
+# send a global commit notice when there are too many commits for individual mails
+sub send_global_notice($$$)
+{
+    my ($ref, $old_sha1, $new_sha1) = @_;
+    my @notice = ();
+
+    open LIST, "-|" or exec "git", "rev-list", "--pretty", "^$old_sha1", "$new_sha1" or die "cannot exec git-rev-list";
+    while (<LIST>)
+    {
+        chomp;
+        s/^commit /URL:    $gitweb_url\/commit\/?id=/ if $gitweb_url;
+        push @notice, $_;
+    }
+    close LIST;
+
+    mail_notification($commitlist_address, "New commits on branch $ref", "text/plain; charset=UTF-8", @notice);
+}
+
+# send all the notices
+sub send_all_notices($$$)
+{
+    my ($old_sha1, $new_sha1, $ref) = @_;
+
+    $ref =~ s/^refs\/heads\///;
+
+    if ($old_sha1 eq '0' x 40)  # new ref
+    {
+        send_commit_notice( $ref, $new_sha1 ) if $commitlist_address;
+        return;
+    }
+
+    my @commits = ();
+
+    open LIST, "-|" or exec "git", "rev-list", "--topo-order", "^$old_sha1", "$new_sha1" or die "cannot exec git-rev-list";
+    while (<LIST>)
+    {
+        chomp;
+        die "invalid commit $_" unless /^[0-9a-f]{40}$/;
+        unshift @commits, $_;
+    }
+    close LIST;
+
+    if (@commits > $max_individual_notices)
+    {
+        send_global_notice( $ref, $old_sha1, $new_sha1 ) if $commitlist_address;
+        return;
+    }
+
+    foreach my $commit (@commits)
+    {
+        send_commit_notice( $ref, $commit ) if $commitlist_address;
+    }
+}
+
+# append repository path to URL
+$gitweb_url .= "/$repos_name" if $gitweb_url;
+
+while (<>)
+{
+    chomp;
+    if (/^([0-9a-f]{40}) ([0-9a-f]{40}) (.*)$/) { send_all_notices( $1, $2, $3 ); }
+}
+
+exit 0;