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- #! /bin/sh
- ### BEGIN INIT INFO
- # Provides: dpkg-squashfs
- # Required-Start: $remote_fs $syslog
- # Required-Stop: $remote_fs $syslog
- # Default-Start: 2 3 4 5
- # Default-Stop: 0 1 6
- # Short-Description: Squashfsed /var/lib/dpkg
- # Description: Use squashfs to speedup dpkg cold start.
- # Required kernel modules: aufs, squashfs
- # Required packages: squashfs-tools
- ### END INIT INFO
- PATH=/sbin:/usr/sbin:/bin:/usr/bin
- DESC="Squashfsed dpkg directory"
- SCRIPTNAME=/etc/init.d/$NAME
- . /lib/lsb/init-functions
- DPKG_DIR=/var/lib/dpkg
- DPKG_RO=/var/lib/.dpkg.ro
- DPKG_RW=/var/lib/.dpkg.rw
- SQUASHFS_FILE=/var/lib/dpkg.squashfs
- mount_squashfs()
- {
- mkdir -p ${DPKG_RO}
- mount -r -t squashfs -o loop ${SQUASHFS_FILE} ${DPKG_RO}
- }
- squashfs_mounted()
- {
- mount | grep -q ${DPKG_RO}
- }
- umount_squashfs()
- {
- umount ${DPKG_RO}
- }
- mount_aufs()
- {
- mkdir -p ${DPKG_RW}
- mount -t aufs -o noplink,br:${DPKG_RW}=rw:${DPKG_RO}=rr dpkgfs ${DPKG_DIR} > /dev/null 2>&1
- }
- aufs_mounted()
- {
- mount | grep -q ^dpkgfs
- }
- umount_aufs()
- {
- umount ${DPKG_DIR}
- }
- make_squashfs()
- {
- rm -f ${SQUASHFS_FILE}.new
- mksquashfs ${DPKG_DIR} ${SQUASHFS_FILE}.new -no-progress > /dev/null 2>&1
- }
- silent_move()
- {
- if [ -e $1 ]; then
- rm -rf $2
- mv $1 $2
- fi
- }
- do_start()
- {
- if ! [ -e ${SQUASHFS_FILE} ]; then
- make_squashfs
- silent_move ${SQUASHFS_FILE}.new ${SQUASHFS_FILE}
- fi
- mount_squashfs && mount_aufs
- }
- do_stop()
- {
- if aufs_mounted; then
- make_squashfs
- fuser -k -m ${DPKG_DIR}
- umount_aufs
- fi
- squashfs_mounted && umount_squashfs
- silent_move ${SQUASHFS_FILE}.new ${SQUASHFS_FILE}
- silent_move ${DPKG_RW} ${DPKG_RW}.old
- rm -rf ${DPKG_RW}.old
- rm -rf ${DPKG_RO}
- return 0
- }
- case "$1" in
- start)
- [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
- do_start
- case "$?" in
- 0) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
- *) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
- esac
- ;;
- stop)
- [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
- do_stop
- case "$?" in
- 0) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
- *) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
- esac
- ;;
- status)
- mount | grep ${DPKG_DIR}
- ;;
- 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|status|restart|force-reload}" >&2
- exit 3
- ;;
- esac
- :
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