debian/ensure-patch

   1 #!/bin/sh
   2 set -e
   3
   4 case "$1" in
   5 "-N") fwd=-N; rev=-R; verb="applied";;
   6 "-R") fwd=-R; rev=-N; verb="reversed";;
   7 *) echo >&2 "Usage: $0 <-N|-R> <patch-file>"; exit 2;;
   8 esac
   9
  10 if patch --dry-run -F0 -f $rev -p1 < "$2" >/dev/null; then
  11         echo >&2 "patch already $verb: $2"
  12         exit 0
  13 fi
  14 patch --dry-run -F0 -f $fwd -p1 < "$2"
  15 patch -F0 -f $fwd -p1 < "$2"