path: root/addons/x11infoscreen/etc/init.d/flashybrid

#!/bin/sh
# Set up/shutdown the flashybrid system, including the ramdisk and partial
# directory bind mounts. This needs to run at the part of system bootup that
# mounts all the disks. It should also run at shutdown right before
# filesystems are unmounted.

CONFDIR=/etc/flashybrid
if [ -e $CONFDIR/config ]; then
    . $CONFDIR/config
fi

ENABLED=no
if [ -e /etc/default/flashybrid ]; then
    . /etc/default/flashybrid
fi

if [ -z "$RAMMOUNT" ]; then
    exit 0
fi

is_mounted () {
    grep -q " $1 " /proc/mounts
}

case "$1" in
start)
    if [ "$ENABLED" != yes ]; then
        echo "Not setting up flashybrid system: disabled."
        exit
    fi
    
    printf "Setting up flashybrid system..."

    # Set up partial directories and so on, make sure disk is
    # unmounted.
    fh-embed >/dev/null
    
    # Set up ram disk to hold variable data.
    if ! is_mounted $RAMMOUNT; then
        mount tmpfs -t tmpfs $RAMMOUNT
    fi

    # Temporary directories on ram disk.
    for dir in $(grep -v '^#' $CONFDIR/ramtmp); do
        mkdir -p -m 1777 $RAMMOUNT/$dir
        if is_mounted $dir; then
            umount $dir
        fi
        mount --bind $RAMMOUNT/$dir $dir
    done

    # Copy data from flash to ram disk for these directories.
    for dir in $(grep -v '^#' $CONFDIR/ramstore); do
        # Skip dirs that are not present.
        if [ -d $dir ]; then
            ramdir=$RAMMOUNT$dir
            if is_mounted $dir; then
                umount $dir
            fi
            if is_mounted $ramdir.flash; then
                umount $ramdir.flash
            fi
            if [ ! -d $ramdir ]; then
                mkdir -p ${ramdir%/*} # dirname
                    cp -a $dir $ramdir
            fi
            mkdir -p $ramdir.flash
            mount --bind $dir $ramdir.flash
            mount --bind $ramdir $dir
        fi
    done

    # Make sure virtual filesystems are properly mounted
    invoke-rc.d mountvirtfs start || /bin/true

    echo "done."
;;
stop)
    if [ "$ENABLED" != yes ]; then
        echo "Not shutting down flashybrid system: disabled."
        exit
    fi
    
    printf "Shutting down flashybrid system..."
    
    # Copy data to flash.
    # Remount the flash read-write so the copies to it will work.
    mount -o remount,rw /
    for dir in $(grep -v '^#' $CONFDIR/ramstore); do
        if [ -d $RAMMOUNT/$dir ] && [ -d $RAMMOUNT/$dir.flash ]; then
            # rsync is used to avoid churning the flash
            # unnecessarily. The trailing slashes are very
            # important..
            rsync --delete -a $RAMMOUNT/$dir/ $RAMMOUNT/$dir.flash/
        fi
    done

    for dir in $(grep -v '^#' $CONFDIR/ramtmp); do
        if is_mounted $dir; then
            umount $dir
        fi
    done
    
    for dir in $(grep -v '^#' $CONFDIR/ramstore); do
        ramdir=$RAMMOUNT$dir
        if is_mounted $ramdir.flash; then
            umount $ramdir.flash
        fi
        if is_mounted $dir; then
            umount $dir
        fi
    done
    
    if is_mounted $RAMMOUNT; then
        umount $RAMMOUNT
    fi  
    
    echo "done."
;;
restart|force-reload)
    $0 stop
    $0 start
;;
*)
    echo "Usage: $0 {start|stop|restart|force-reload}"
    exit 1
;;
esac