Personal Computer World 2007 September/PCWSEP07.iso/Software/Linux/Linux Mint 3.0 Light/LinuxMint-3.0-Light.iso/casper/filesystem.squashfs/usr/src/linux-headers-2.6.20-15-generic/scripts/patch-kernel

Text File | 2007-04-12 | 9.7 KB | 329 lines

#! /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 <[e-mail]>, 2nd January 1995.
#
# Added support for handling multiple types of compression. What includes
# gzip, bzip, bzip2, zip, compress, and plaintext.
#
#       Adam Sulmicki <[e-mail]>, 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 <[e-mail]>, 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 <[e-mail]>, 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 <[e-mail]>, 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 <[e-mail]>, 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}.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
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
source $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
    if [ ${EXTRAVERSION:0:1} == "." ]; then
        EXTRAVER=${EXTRAVERSION:1}
    else
        EXTRAVER=$EXTRAVERSION
    fi
    EXTRAVER=${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 $stopvers | cut -d. -f4`
    #echo "#___STOPSUBLEVEL=/$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 [ $stopvers == $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