linux-yocto/scripts/patch-kernel

#! /bin/sh

SPDX-License-Identifier: GPL-2.0

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 Nick.Holloway@alfie.demon.co.uk, 2nd January 1995.

Added support for handling multiple types of compression. What includes

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

Adam Sulmicki adam@cfar.umd.edu, 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 linux@treblig.org, 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 linux@treblig.org, 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 rdunlap@xenotime.net, 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 rdunlap@xenotime.net, 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 . 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