[PATCH] patch-kernel: support non-incremental 2.6.x.y 'stable' patches

Add better support for (non-incremental) 2.6.x.y patches; If an ending
version number if not specified, the script automatically increments the
SUBLEVEL (x in 2.6.x.y) until no more patch files are found; however,
EXTRAVERSION (y in 2.6.x.y) is never automatically incremented but must be
specified fully.

patch-kernel does not normally support reverse patching, but does so when
applying EXTRAVERSION (x.y) patches, so that moving from 2.6.11.y to
2.6.11.z is easy and handled by the script (reverse 2.6.11.y and apply
2.6.11.z).
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

scripts/patch-kernel

@@ -46,6 +46,19 @@
 # fix some whitespace damage;
 # be smarter about stopping when current version is larger than requested;
 #	Randy Dunlap <rddunlap@osdl.org>, 2004-AUG-18.
+#
+# Add better support for (non-incremental) 2.6.x.y patches;
+# If an ending version number if not specified, the script automatically
+# increments the SUBLEVEL (x in 2.6.x.y) until no more patch files are found;
+# however, EXTRAVERSION (y in 2.6.x.y) is never automatically incremented
+# but must be specified fully.
+#
+# patch-kernel does not normally support reverse patching, but does so when
+# applying EXTRAVERSION (x.y) patches, so that moving from 2.6.11.y to 2.6.11.z
+# is easy and handled by the script (reverse 2.6.11.y and apply 2.6.11.z).
+#	Randy Dunlap <rddunlap@osdl.org>, 2005-APR-08.
+
+PNAME=patch-kernel
 
 # Set directories from arguments, or use defaults.
 sourcedir=${1-/usr/src/linux}
@@ -54,7 +67,7 @@ stopvers=${3-default}
 
 if [ "$1" == -h -o "$1" == --help -o ! -r "$sourcedir/Makefile" ]; then
 cat << USAGE
-usage: patch-kernel [-h] [ sourcedir [ patchdir [ stopversion ] [ -acxx ] ] ]
+usage: $PNAME [-h] [ sourcedir [ patchdir [ stopversion ] [ -acxx ] ] ]
   source directory defaults to /usr/src/linux,
   patch directory defaults to the current directory,
   stopversion defaults to <all in patchdir>.
@@ -72,6 +85,19 @@ do
 	esac;
 done
 
+# ---------------------------------------------------------------------------
+# arg1 is filename
+noFile () {
+	echo "cannot find patch file: ${patch}"
+	exit 1
+}
+
+# ---------------------------------------------------------------------------
+backwards () {
+	echo "$PNAME does not support reverse patching"
+	exit 1
+}
+
 # ---------------------------------------------------------------------------
 # Find a file, first parameter is basename of file
 # it tries many compression mechanisms and sets variables to say how to get it
@@ -133,6 +159,28 @@ applyPatch () {
   return 0;
 }
 
+# ---------------------------------------------------------------------------
+# arg1 is patch filename
+reversePatch () {
+	echo -n "Reversing $1 (${name}) ... "
+	if $uncomp ${patchdir}/"$1"${ext} | patch -p1 -Rs -N -E -d $sourcedir
+	then
+		echo "done."
+	else
+		echo "failed.  Clean it up."
+		exit 1
+	fi
+	if [ "`find $sourcedir/ '(' -name '*.rej' -o -name '.*.rej' ')' -print`" ]
+	then
+		echo "Aborting.  Reject files found."
+		return 1
+	fi
+	# Remove backup files
+	find $sourcedir/ '(' -name '*.orig' -o -name '.*.orig' ')' -exec rm -f {} \;
+
+	return 0
+}
+
 # set current VERSION, PATCHLEVEL, SUBLEVEL, EXTRAVERSION
 TMPFILE=`mktemp .tmpver.XXXXXX` || { echo "cannot make temp file" ; exit 1; }
 grep -E "^(VERSION|PATCHLEVEL|SUBLEVEL|EXTRAVERSION)" $sourcedir/Makefile > $TMPFILE
@@ -160,53 +208,57 @@ then
 		EXTRAVER=$EXTRAVERSION
 	fi
 	EXTRAVER=${EXTRAVER%%[[:punct:]]*}
-	#echo "patch-kernel: changing EXTRAVERSION from $EXTRAVERSION to $EXTRAVER"
+	#echo "$PNAME: changing EXTRAVERSION from $EXTRAVERSION to $EXTRAVER"
 fi
 
 #echo "stopvers=$stopvers"
 if [ $stopvers != "default" ]; then
 	STOPSUBLEVEL=`echo $stopvers | cut -d. -f3`
 	STOPEXTRA=`echo $stopvers | cut -d. -f4`
-	#echo "STOPSUBLEVEL=$STOPSUBLEVEL, STOPEXTRA=$STOPEXTRA"
+	#echo "#___STOPSUBLEVEL=/$STOPSUBLEVEL/, STOPEXTRA=/$STOPEXTRA/"
 else
 	STOPSUBLEVEL=9999
 	STOPEXTRA=9999
 fi
 
-while :				# incrementing SUBLEVEL (s in v.p.s)
-do
-    if [ x$EXTRAVER != "x" ]; then
+# This all assumes a 2.6.x[.y] kernel tree.
+# Don't allow backwards/reverse patching.
+if [ $STOPSUBLEVEL -lt $SUBLEVEL ]; then
+	backwards
+fi
+
+if [ x$EXTRAVER != "x" ]; then
 	CURRENTFULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL.$EXTRAVER"
-    else
+else
 	CURRENTFULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
-    fi
+fi
+
+if [ x$EXTRAVER != "x" ]; then
+	echo "backing up to: $VERSION.$PATCHLEVEL.$SUBLEVEL"
+	patch="patch-${CURRENTFULLVERSION}"
+	findFile $patchdir/${patch} || noFile ${patch}
+	reversePatch ${patch} || exit 1
+fi
 
+# now current is 2.6.x, with no EXTRA applied,
+# so update to target SUBLEVEL (2.6.SUBLEVEL)
+# and then to target EXTRAVER (2.6.SUB.EXTRAVER) if requested.
+# If not ending sublevel is specified, it is incremented until
+# no further sublevels are found.
+
+if [ $STOPSUBLEVEL -gt $SUBLEVEL ]; then
+while :				# incrementing SUBLEVEL (s in v.p.s)
+do
+    CURRENTFULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
+    EXTRAVER=
     if [ $stopvers == $CURRENTFULLVERSION ]; then
         echo "Stopping at $CURRENTFULLVERSION base as requested."
         break
     fi
 
-    while :			# incrementing EXTRAVER (x in v.p.s.x)
-    do
-	EXTRAVER=$((EXTRAVER + 1))
-	FULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL.$EXTRAVER"
-	#echo "... trying $FULLVERSION ..."
-
-	patch=patch-$FULLVERSION
-
-	# See if the file exists and find extension
-	findFile $patchdir/${patch} || break
-
-	# Apply the patch and check all is OK
-	applyPatch $patch || break
-
-	continue 2
-    done
-
-    EXTRAVER=
     SUBLEVEL=$((SUBLEVEL + 1))
     FULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
-    #echo "___ trying $FULLVERSION ___"
+    #echo "#___ trying $FULLVERSION ___"
 
     if [ $((SUBLEVEL)) -gt $((STOPSUBLEVEL)) ]; then
 	echo "Stopping since sublevel ($SUBLEVEL) is beyond stop-sublevel ($STOPSUBLEVEL)"
@@ -214,14 +266,33 @@ do
     fi
 
     patch=patch-$FULLVERSION
-
     # See if the file exists and find extension
-    findFile $patchdir/${patch} || break
+    findFile $patchdir/${patch} || noFile ${patch}
 
     # Apply the patch and check all is OK
     applyPatch $patch || break
 done
-#echo "base all done"
+#echo "#___sublevel all done"
+fi
+
+# There is no incremental searching for extraversion...
+if [ "$STOPEXTRA" != "" ]; then
+while :				# just to allow break
+do
+# apply STOPEXTRA directly (not incrementally) (x in v.p.s.x)
+	FULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL.$STOPEXTRA"
+	#echo "#... trying $FULLVERSION ..."
+	patch=patch-$FULLVERSION
+
+	# See if the file exists and find extension
+	findFile $patchdir/${patch} || noFile ${patch}
+
+	# Apply the patch and check all is OK
+	applyPatch $patch || break
+	#echo "#___extraver all done"
+	break
+done
+fi
 
 if [ x$gotac != x ]; then
   # Out great user wants the -ac patches