1 files changed, 101 insertions, 30 deletions

diff --git a/scripts/patch-kernel b/scripts/patch-kernel
index 43af01075612..f2d47ca9c8fa 100755
--- a/scripts/patch-kernel
+++ b/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>.
@@ -73,6 +86,19 @@ do
 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
 findFile () {
@@ -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