http://d.hatena.ne.jp/tyru/20120823/initscript_vartmp

vartmp

#!/bin/bash
### BEGIN INIT INFO
# Provides:          skeleton
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Example initscript
# Description:       Using tmpfs for /var/*
#                    https://wiki.archlinux.org/index.php/Using_tmpfs_for_/var/*
### END INIT INFO

# Author: ???
# Modified by: tyru <tyru.exe@gmail.com>

# 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="Using tmpfs for /var/*"
NAME=vartmp
SCRIPTNAME=/etc/init.d/$NAME
VARTMP=/dev/shm/vartmp
VARTMP_DIRS='log'

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

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions

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


do_start() {
        if [ ! -d ${VARTMP} ]; then
            mkdir -m0777 ${VARTMP}
        fi
        for d in ${VARTMP_DIRS}; do
            move_to_vartmp ${d} || return 0
        done
        return 0
}

do_stop() {
        for d in ${VARTMP_DIRS}; do
            move_from_vartmp ${d} || return 1
        done
        return 0
}

say() {
    [ "$VERBOSE" != no ] && log_daemon_msg  "$*" "$NAME"
}
ok_msg() {
    [ "$VERBOSE" != no ] && log_end_msg 0
    exit 0
}
fail_msg() {
    [ "$VERBOSE" != no ] && log_end_msg 1
    exit 1
}

# This function transfer /var/* to ${VARTMP}
move_to_vartmp() {
    say "Moving /var/${1} to ${VARTMP}/${1}"
    #
    # Move /var/xxx contents to ${VARTMP}
    #
    if [ -e /var/${1} ]; then
        mv /var/${1} ${VARTMP} || return 1
        ln -sf ${VARTMP}/${1} /var/${1} || return 1
    else
        if [ ! -d ${VARTMP}/${1} ]; then
            rm -f ${VARTMP}/${1} || return 1
            mkdir ${VARTMP}/${1} || return 1
            chmod 777 ${VARTMP}/${1} || return 1
        fi
    fi
    return 0
}

# This function transfer ${VARTMP} back to /var
move_from_vartmp() {
    say "Moving ${VARTMP}/${1} back to /var/${1}"
    if [ -d ${VARTMP}/${1} ]; then
        if [ -e /var/${1} ]; then
            rm -f /var/${1} || return 1
        fi
        mv ${VARTMP}/${1} /var/ || return 1
    fi
    return 0
}



case "$1" in
    start)
        say 'Migrating /var to tmpfs'
        do_start || fail_msg
        ok_msg
        ;;
    stop)
        say 'Syncing /var from tmpfs'
        do_stop || fail_msg
        ok_msg
        ;;
    #status)
    #    status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
    #    ;;
    #reload|force-reload)
    #    #
    #    # If do_reload() is not implemented then leave this commented out
    #    # and leave 'force-reload' as an alias for 'restart'.
    #    #
    #    say "Reloading $DESC"
    #    do_reload
    #    ok_msg
    #    ;;
    restart|force-reload)
        #
        # If the "reload" option is implemented then remove the
        # 'force-reload' alias
        #
        say "Restarting $DESC"
        do_stop  || fail_msg
        do_start || fail_msg
        ok_msg
        ;;
    *)
        echo "Usage: $0 {start|stop|restart}"
        exit 3
        ;;
esac