Added init script for Debian's SysV-style init system

Adapted from the OpenRC init script in contrib/openrc/init.d/gollum.

contrib/sysv-debian/init.d/gollum

@@ -0,0 +1,79 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:          gollum
+# Required-Start:    $local_fs $remote_fs $network $syslog
+# Required-Stop:     $local_fs $remote_fs $network $syslog
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# X-Interactive:     true
+# Short-Description: Start/stop gollum wiki
+### END INIT INFO
+
+# Distributed under the terms of the MIT License
+
+set -e
+
+# Edit these settings to your liking:
+GOLLUM_USER=gollum
+GOLLUM_BASE=/var/lib/gollum/.git
+GOLLUM_OPTS="--bare"
+
+NAME=gollum
+PID=/var/run/${NAME}.pid
+EXEC=/usr/local/bin/gollum
+LOG=/var/log/gollum.log
+
+. /lib/lsb/init-functions
+
+start ()
+{
+    # Change log file to be owned by GOLLUM_USER
+    touch "${LOG}"
+    chown "${GOLLUM_USER}" "${LOG}"
+
+    log_daemon_msg "Starting Gollum"
+    start-stop-daemon --start \
+        --name "${NAME}" \
+        --user "${GOLLUM_USER}" \
+        --chuid "${GOLLUM_USER}" \
+        --pidfile "${PID}" \
+        --make-pidfile --background \
+        --startas /bin/sh -- -c "exec ${EXEC} $GOLLUM_OPTS \"$GOLLUM_BASE\" > \"${LOG}\" 2>&1"
+    log_end_msg $?
+}
+
+stop ()
+{
+    log_daemon_msg "Stopping Gollum"
+    start-stop-daemon --stop \
+        --user "${GOLLUM_USER}" \
+        --signal INT \
+        --pidfile "${PID}" \
+        --retry 10
+    log_end_msg $?
+}
+
+status ()
+{
+    status_of_proc -p $PID $EXEC $NAME
+}
+
+case $1 in
+    start)
+        start
+        ;;
+    stop)
+        stop
+        ;;
+    restart)
+        stop
+        start
+        ;;
+    status)
+        status
+        ;;
+    *)
+        log_success_msg "Usage: $0 {start|stop|restart|status}"
+        exit 1
+        ;;
+esac