1 files changed, 84 insertions, 0 deletions

diff --git a/bin/git-mirror b/bin/git-mirror
new file mode 100755
index 0000000..af54a14
--- /dev/null
+++ b/bin/git-mirror
@@ -0,0 +1,84 @@
+#!/bin/sh
+#
+# Copyright (c) 2013 Nagios Plugins Development Team
+#
+# Originally written by Holger Weiss <holger@zedat.fu-berlin.de>.
+#
+# This file is free software; the Nagios Plugins Development Team gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY, to the extent permitted by law; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+set -e
+set -u
+
+export PATH='/usr/local/bin:/usr/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin'
+
+temp_prefix='/run/shm'
+fourty_zeros=$(printf '%.40u' 0)
+myself=${0##*/}
+
+check_refs()
+{
+        turn=$1
+        temp_dir=$2
+
+        git show-ref | while read object ref
+        do
+                ref_dir="$temp_dir/${ref%/*}"
+                ref_file="$temp_dir/$ref"
+
+                if [ $turn -eq 2 -a -f "$ref_file" ] \
+                    && grep "^1 $object$" "$ref_file" >'/dev/null'
+                then    # The ref has not been modified.
+                        rm -f "$ref_file"
+                else
+                        mkdir -p "$ref_dir"
+                        echo "$turn $object" >>"$ref_file"
+                fi
+        done
+}
+
+if [ $# -lt 1 ]
+then
+        echo >&2 "Usage: $myself <repository> ..."
+        exit 2
+fi
+
+temp_dir=$(mktemp -d "$temp_prefix/$myself.XXXXXX")
+temp_file=$(mktemp "$temp_prefix/$myself.XXXXXX")
+trap 'rm -rf "$temp_dir" "$temp_file"' EXIT
+
+for repository in "$@"
+do
+        hook="$repository/hooks/post-receive"
+        cd "$repository"
+
+        check_refs 1 "$temp_dir"
+        if ! git remote update --prune >"$temp_file" 2>&1
+        then
+                cat >&2 "$temp_file"
+                exit 1
+        fi
+        git fetch --quiet --tags
+        check_refs 2 "$temp_dir"
+
+        if [ -x "$hook" ]
+        then
+                find "$temp_dir" -type 'f' -print | while read ref_file
+                do
+                        ref=${ref_file#$temp_dir/}
+                        old=$(awk '$1 == "1" { print $2; exit }' "$ref_file")
+                        new=$(awk '$1 == "2" { print $2; exit }' "$ref_file")
+                        old=${old:-$fourty_zeros}
+                        new=${new:-$fourty_zeros}
+
+                        echo "$old" "$new" "$ref"
+                done >"$temp_file"
+                test -s "$temp_file" && "$hook" <"$temp_file"
+        fi
+        cd "$OLDPWD"
+done