Import git-update-mirror and git-notify

Import the (self-written) git-update-mirror script, which updates clones
of Git repositories and then calls git-notify (in just the same way as a
post-receive hook would be called by Git).  The git-notify script is
imported from git://source.winehq.org/git/tools.git (commit: 03d66f34)
and generates notifications on repository changes.  We'll use these
scripts for generating our commit e-mails.

1 files changed, 94 insertions, 0 deletions

diff --git a/tools/git-update-mirror b/tools/git-update-mirror
new file mode 100755
index 0000000..1c6eea5
--- /dev/null
+++ b/tools/git-update-mirror
@@ -0,0 +1,94 @@
+#!/bin/sh
+#
+# Copyright (c) 2009 Nagios Plugins Development Team
+#
+# 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 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set -e
+set -u
+
+prefix='/home/git'
+
+PATH="$prefix/opt/git/bin:/bin:/usr/bin"
+export PATH
+
+gitnotify="$prefix/libexec/git-notify"
+recipient='Nagios Plugins Commit List <nagiosplug-checkins@lists.sourceforge.net>'
+maxcommits=100
+maxdiffsize=$((300 * 1024))
+gitweburl='http://repo.or.cz/w'
+tempprefix='/dev/shm'
+fourtyzeros=$(printf '%.40u' 0)
+myself=${0##*/}
+
+checkrefs()
+{
+        turn=$1
+
+        git show-ref | while read object ref
+        do
+                refdir="$tempdir/${ref%/*}"
+                reffile="$tempdir/$ref"
+
+                if [ $turn -eq 2 -a -f "$reffile" ] \
+                    && grep "^1 $object$" "$reffile" >'/dev/null'
+                then    # The ref has not been modified.
+                        rm -f "$reffile"
+                else
+                        mkdir -p "$refdir"
+                        echo "$turn $object" >>"$reffile"
+                fi
+        done
+}
+
+if [ $# -lt 1 ]
+then
+        echo >&2 "Usage: $myself <repository> ..."
+        exit 1
+fi
+
+tempdir=$(mktemp -d "$tempprefix/$myself.XXXXXX")
+tempfile=$(mktemp "$tempprefix/$myself.XXXXXX")
+trap 'rm -rf "$tempdir" "$tempfile"' EXIT
+
+for repository in "$@"
+do
+        cd "$repository"
+
+        checkrefs 1
+        if ! git remote update --prune >"$tempfile" 2>&1
+        then
+                cat >&2 "$tempfile"
+                exit 1
+        fi
+        git fetch --quiet --tags
+        checkrefs 2
+
+        find "$tempdir" -type 'f' -print | sed 's!^\./!!' | while read reffile
+        do
+                ref=${reffile#$tempdir/}
+                old=$(awk '$1 == "1" { print $2; exit }' "$reffile")
+                new=$(awk '$1 == "2" { print $2; exit }' "$reffile")
+                old=${old:-$fourtyzeros}
+                new=${new:-$fourtyzeros}
+
+                echo "$old" "$new" "$ref"
+        done | $gitnotify \
+            -m "$recipient" \
+            -n "$maxcommits" \
+            -s "$maxdiffsize" \
+            -u "$gitweburl"
+
+        cd "$OLDPWD"
+done