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Code Editor : 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 <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

${this.title}

Code Editor : patch-kernel