copyfs-mount

#!/bin/bash

# copyfs - copy on write filesystem  http://n0x.org/copyfs/
# Copyright (C) 2004 Nicolas Vigier <boklm@mars-attacks.org>
#                    Thomas Joubert <widan@net-42.eu.org>
# This program can be distributed under the terms of the GNU GPL.
# See the file COPYING.

FILESYSTEM_HANDLER=copyfs-daemon

# Force single-threaded mode, as we aren't MT safe
FILESYSTEM_PARAMETERS="-s"

if [ $# -lt 2 ]; then
    echo "Usage: $0 version-directory mount-point" 1>&2
    exit 1
fi

if ! echo "$1" | grep '^/'
then
   echo "Please use absolute path" 1>&2
   exit 1
fi

# Check fuse module
if ! grep fuse /proc/modules > /dev/null; then
    if [ $UID = 0 ]; then
	modprobe fuse > /dev/null || {
	    echo "Could not load fuse kernel module !" 1>&2
	    exit 1
	}
    else
	echo "You need the fuse kernel module to run this. As you are"
	echo "not root, I can't load it. Become root and run :"
	echo
	echo "    modprobe fuse"
	exit 1
    fi
fi

if [ $UID == 0 ]; then
    # Allow other users and check permissions if run by root
    FILESYSTEM_PARAMETERS="${FILESYSTEM_PARAMETERS} -o default_permissions,allow_other"
fi

# Check if version dir sane
if [ ! -w "$1" -o ! -x "$1" ]; then
    echo "Your version directory needs to be writable and executable" 1>&1
    exit 2
fi

# Check if there is the root directory metadata, else create it
if [ ! -f "$1/metadata." ]; then
    echo "1:0:0755:0:0:$(basename $1)" > "$1/metadata."
    chmod 700 "$1/metadata."
fi

# Run the daemon
export RCS_VERSION_PATH="$1"
eval ${FILESYSTEM_HANDLER} "${FILESYSTEM_PARAMETERS}" "$2"