backup/nosnap

   1 #!/bin/sh
   2
   3 set -e
   4
   5 removes () {
   6         rmdir -- "$vardir/snap-mount" || rm -f -- "$vardir/snap-mount"
   7         rm -f -- "$vardir/snap-device"
   8 }
   9
  10 vardir="$2"
  11
  12 case "$#.$1" in
  13 2.drop)
  14         removes
  15         ;;
  16 4.snap)
  17         removes
  18         ln -s -- "$3" "$vardir/snap-device"
  19         ln -s -- "$4" "$vardir/snap-mount"
  20         ;;
  21 *)
  22         cat >&2 <<'END'
  23 usage: .../nosnap snap VARDIR DEV MOUNT
  24        .../nosnap drop VARDIR
  25 END
  26         exit 1
  27         ;;
  28 esac