backup/nosnap

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