#! /bin/sh

# Script to apply kernel patches.

# usage: patch-kernel [ sourcedir [ patchdir [ stopversion ] [ -acxx ] ] ]

# The source directory defaults to /usr/src/linux, and the patch

# directory defaults to the current directory.

# e.g.

# scripts/patch-kernel . ..

# Update the kernel tree in the current directory using patches in the

# directory above to the latest Linus kernel

# scripts/patch-kernel . .. -ac

# Get the latest Linux kernel and patch it with the latest ac patch

# scripts/patch-kernel . .. 2.4.9

# Gets standard kernel 2.4.9

# scripts/patch-kernel . .. 2.4.9 -ac

# Gets 2.4.9 with latest ac patches

# scripts/patch-kernel . .. 2.4.9 -ac11

# Gets 2.4.9 with ac patch ac11

# Note: It uses the patches relative to the Linus kernels, not the

# ac to ac relative patches

#

# It determines the current kernel version from the top-level Makefile.

# It then looks for patches for the next sublevel in the patch directory.

# This is applied using "patch -p1 -s" from within the kernel directory.

# A check is then made for "*.rej" files to see if the patch was

# successful. If it is, then all of the "*.orig" files are removed.

#

# Nick Holloway <[email protected]>, 2nd January 1995.

#

# Added support for handling multiple types of compression. What includes

# gzip, bzip, bzip2, zip, compress, and plaintext.

#

# Adam Sulmicki <[email protected]>, 1st January 1997.

#

# Added ability to stop at a given version number

# Put the full version number (i.e. 2.3.31) as the last parameter

# Dave Gilbert <[email protected]>, 11th December 1999.

# Fixed previous patch so that if we are already at the correct version

# not to patch up.

#

# Added -ac option, use -ac or -ac9 (say) to stop at a particular version

# Dave Gilbert <[email protected]>, 29th September 2001.

#

# Add support for (use of) EXTRAVERSION (to support 2.6.8.x, e.g.);

# update usage message;

# fix some whitespace damage;

# be smarter about stopping when current version is larger than requested;

# Randy Dunlap <[email protected]>, 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 <[email protected]>, 2005-APR-08.

PNAME=patch-kernel

# Set directories from arguments, or use defaults.

sourcedir=${1-/usr/src/linux}

patchdir=${2-.}

stopvers=${3-default}

if [ "$1" = -h -o "$1" = --help -o ! -r "$sourcedir/Makefile" ]; then

cat << USAGE

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>.

USAGE

exit 1

fi

# See if we have any -ac options

for PARM in $*

do

case $PARM in

-ac*)

gotac=$PARM;

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

findFile () {

filebase=$1;

if [ -r ${filebase}.gz ]; then

ext=".gz"

name="gzip"

uncomp="gunzip -dc"

elif [ -r ${filebase}.bz ]; then

ext=".bz"

name="bzip"

uncomp="bunzip -dc"

elif [ -r ${filebase}.bz2 ]; then

ext=".bz2"

name="bzip2"

uncomp="bunzip2 -dc"

elif [ -r ${filebase}.xz ]; then

ext=".xz"

name="xz"

uncomp="xz -dc"

elif [ -r ${filebase}.zip ]; then

ext=".zip"

name="zip"

uncomp="unzip -d"

elif [ -r ${filebase}.Z ]; then

ext=".Z"

name="uncompress"

uncomp="uncompress -c"

elif [ -r ${filebase} ]; then

ext=""

name="plaintext"

uncomp="cat"

else

return 1;

fi

return 0;

}

# ---------------------------------------------------------------------------

# Apply a patch and check it goes in cleanly

# First param is patch name (e.g. patch-2.4.9-ac5) - without path or extension

applyPatch () {

echo -n "Applying $1 (${name})... "

if $uncomp ${patchdir}/$1${ext} | patch -p1 -s -N -E -d $sourcedir

then

echo "done."

else

echo "failed. Clean up yourself."

return 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;

}

# ---------------------------------------------------------------------------

# 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

# force $TMPFILEs below to be in local directory: a slash character prevents

# the dot command from using the search path.

TMPFILE=`mktemp ./.tmpver.XXXXXX` || { echo "cannot make temp file" ; exit 1; }

grep -E "^(VERSION|PATCHLEVEL|SUBLEVEL|EXTRAVERSION)" $sourcedir/Makefile > $TMPFILE

tr -d [:blank:] < $TMPFILE > $TMPFILE.1

. $TMPFILE.1

rm -f $TMPFILE*

if [ -z "$VERSION" -o -z "$PATCHLEVEL" -o -z "$SUBLEVEL" ]

then

echo "unable to determine current kernel version" >&2

exit 1

fi

NAME=`grep ^NAME $sourcedir/Makefile`

NAME=${NAME##*=}

echo "Current kernel version is $VERSION.$PATCHLEVEL.$SUBLEVEL${EXTRAVERSION} ($NAME)"

# strip EXTRAVERSION to just a number (drop leading '.' and trailing additions)

EXTRAVER=

if [ x$EXTRAVERSION != "x" ]

then

EXTRAVER=${EXTRAVERSION#.}

EXTRAVER=${EXTRAVER%%[[:punct:]]*}

#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`

STOPFULLVERSION=${stopvers%%.$STOPEXTRA}

#echo "#___STOPSUBLEVEL=/$STOPSUBLEVEL/, STOPEXTRA=/$STOPEXTRA/"

else

STOPSUBLEVEL=9999

STOPEXTRA=9999

fi

# 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

CURRENTFULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"

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 [ x$STOPFULLVERSION = x$CURRENTFULLVERSION ]; then

echo "Stopping at $CURRENTFULLVERSION base as requested."

break

fi

SUBLEVEL=$(($SUBLEVEL + 1))

FULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"

#echo "#___ trying $FULLVERSION ___"

if [ $(($SUBLEVEL)) -gt $(($STOPSUBLEVEL)) ]; then

echo "Stopping since sublevel ($SUBLEVEL) is beyond stop-sublevel ($STOPSUBLEVEL)"

exit 1

fi

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

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

# They could have done -ac (get latest) or -acxx where xx=version they want

if [ $gotac = "-ac" ]; then

# They want the latest version

HIGHESTPATCH=0

for PATCHNAMES in $patchdir/patch-${CURRENTFULLVERSION}-ac*\.*

do

ACVALUE=`echo $PATCHNAMES | sed -e 's/^.*patch-[0-9.]*-ac\([0-9]*\).*/\1/'`

# Check it is actually a recognised patch type

findFile $patchdir/patch-${CURRENTFULLVERSION}-ac${ACVALUE} || break

if [ $ACVALUE -gt $HIGHESTPATCH ]; then

HIGHESTPATCH=$ACVALUE

fi

done

if [ $HIGHESTPATCH -ne 0 ]; then

findFile $patchdir/patch-${CURRENTFULLVERSION}-ac${HIGHESTPATCH} || break

applyPatch patch-${CURRENTFULLVERSION}-ac${HIGHESTPATCH}

else

echo "No -ac patches found"

fi

else

# They want an exact version

findFile $patchdir/patch-${CURRENTFULLVERSION}${gotac} || {

echo "Sorry, I couldn't find the $gotac patch for $CURRENTFULLVERSION. Hohum."

exit 1

}

applyPatch patch-${CURRENTFULLVERSION}${gotac}

fi

fi