#! /bin/sh
### BEGIN INIT INFO
# Provides:          debathena-pyhesiodfs
# Required-Start:    openafs-client
# Required-Stop:     openafs-client
# Should-Start:      $local_fs $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Hesiod automounter for Athena lockers
# Description:       Auto-create symlinks from /mit/LOCKER to AFS using Hesiod lookups.
### END INIT INFO

# Author: Evan Broder <broder@mit.edu>, Geoffrey Thomas <geofft@mit.edu>

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="Debathena /mit automounter"
NAME=debathena-pyhesiodfs
DAEMON=/usr/bin/pyhesiodfs
pyhesiodfs_dir="/mit"
DAEMON_ARGS="-f $pyhesiodfs_dir -o nonempty"
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
: ${VERBOSE:=yes}
if [ -f /lib/init/vars.sh ]; then
    . /lib/init/vars.sh
elif [ -f /etc/default/rcS ]; then
    . /etc/default/rcS
fi

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

#
# Function that starts the daemon/service
#
do_start()
{
    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    
    # Try to make sure fuse is setup
    [ -e /dev/fuse ] || modprobe fuse || return 2
    
    if cat /proc/mounts | grep " $pyhesiodfs_dir " >/dev/null 2>&1; then
	return 1
    fi
    
    mkdir -p "$pyhesiodfs_dir"
    chown root:pyhesiodfs "$pyhesiodfs_dir"
    chmod 770 "$pyhesiodfs_dir"
    
    start-stop-daemon --start --quiet --pidfile $PIDFILE \
        --chuid pyhesiodfs:pyhesiodfs --background \
        --make-pidfile \
	--exec $DAEMON -- \
        $DAEMON_ARGS \
        || return 2
}

#
# Function that stops the daemon/service
#
do_stop()
{
    # Return
    #   0 if daemon has been stopped
    #   1 if daemon was already stopped
    #   2 if daemon could not be stopped
    #   other if a failure occurred
    
    if cat /proc/mounts | grep " $pyhesiodfs_dir " >/dev/null 2>&1; then
        umount -l "$pyhesiodfs_dir" || return 2
        # Many daemons don't delete their pidfiles when they exit.
	rm -f "$PIDFILE"
    else
	return 1
    fi
}

case "$1" in
    start)
        [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
        do_start
        case "$?" in
            0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
            2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
    stop)
        [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
        do_stop
        case "$?" in
            0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
            2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
    restart|force-reload)
        log_daemon_msg "Restarting $DESC" "$NAME"
        do_stop
        case "$?" in
            0|1)
                do_start
                case "$?" in
                    0) log_end_msg 0 ;;
                    1) log_end_msg 1 ;; # Old process is still running
                    *) log_end_msg 1 ;; # Failed to start
                esac
                ;;
            *)
                # Failed to stop
                log_end_msg 1
                ;;
        esac
        ;;
    *)
        echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
        exit 3
        ;;
esac

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