From: Michael Tremer <michael.tremer@ipfire.org>
Date: Sun, 8 Jan 2012 14:16:20 +0000 (+0100)
Subject: patch: Add support for reverting patches.
X-Git-Tag: 0.9.20~23
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4e652a763360eacb922b66efd5a1813416851c6e;p=pakfire.git

patch: Add support for reverting patches.
---

diff --git a/tools/patch b/tools/patch
index 927b8803a..4d4c2ae57 100755
--- a/tools/patch
+++ b/tools/patch
@@ -46,10 +46,24 @@ for patch in ${patches}; do
 
 	# Get right -p1 option.
 	case "${patch}" in
-		*.patch[0-9])
+		*.patch[0-9]|*.patch[0-9]R)
+			_patch="${patch}"
 			# Get patch level from file name.
-			level=${patch:$(( ${#patch} - 1))}
-			options="${options} -p${level}"
+			while [ ${#_patch} -gt 0 ]; do
+				last_pos=$(( ${#_patch} - 1 ))
+				last_char=${_patch:${last_pos}}
+				_patch=${_patch:0:${last_pos}}
+
+				case "${last_char}" in
+					[0-9])
+						options="${options} -p${last_char}"
+						break
+						;;
+					R)
+						options="${options} -R"
+						;;
+				esac
+			done
 			;;
 		*.patch|*.diff)
 			# Default is -p1.