linux/scripts/patch-kernel
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   1#! /bin/sh
   2# Script to apply kernel patches.
   3#   usage: patch-kernel [ sourcedir [ patchdir [ stopversion ] [ -acxx ] ] ]
   4#     The source directory defaults to /usr/src/linux, and the patch
   5#     directory defaults to the current directory.
   6# e.g.
   7#   scripts/patch-kernel . ..
   8#      Update the kernel tree in the current directory using patches in the
   9#      directory above to the latest Linus kernel
  10#   scripts/patch-kernel . .. -ac
  11#      Get the latest Linux kernel and patch it with the latest ac patch
  12#   scripts/patch-kernel . .. 2.4.9
  13#      Gets standard kernel 2.4.9
  14#   scripts/patch-kernel . .. 2.4.9 -ac
  15#      Gets 2.4.9 with latest ac patches
  16#   scripts/patch-kernel . .. 2.4.9 -ac11
  17#      Gets 2.4.9 with ac patch ac11
  18#   Note: It uses the patches relative to the Linus kernels, not the
  19#   ac to ac relative patches
  20#
  21# It determines the current kernel version from the top-level Makefile.
  22# It then looks for patches for the next sublevel in the patch directory.
  23# This is applied using "patch -p1 -s" from within the kernel directory.
  24# A check is then made for "*.rej" files to see if the patch was
  25# successful.  If it is, then all of the "*.orig" files are removed.
  26#
  27#       Nick Holloway <Nick.Holloway@alfie.demon.co.uk>, 2nd January 1995.
  28#
  29# Added support for handling multiple types of compression. What includes
  30# gzip, bzip, bzip2, zip, compress, and plaintext. 
  31#
  32#       Adam Sulmicki <adam@cfar.umd.edu>, 1st January 1997.
  33#
  34# Added ability to stop at a given version number
  35# Put the full version number (i.e. 2.3.31) as the last parameter
  36#       Dave Gilbert <linux@treblig.org>, 11th December 1999.
  37
  38# Fixed previous patch so that if we are already at the correct version
  39# not to patch up.
  40#
  41# Added -ac option, use -ac or -ac9 (say) to stop at a particular version
  42#       Dave Gilbert <linux@treblig.org>, 29th September 2001.
  43#
  44# Add support for (use of) EXTRAVERSION (to support 2.6.8.x, e.g.);
  45# update usage message;
  46# fix some whitespace damage;
  47# be smarter about stopping when current version is larger than requested;
  48#       Randy Dunlap <rdunlap@xenotime.net>, 2004-AUG-18.
  49#
  50# Add better support for (non-incremental) 2.6.x.y patches;
  51# If an ending version number if not specified, the script automatically
  52# increments the SUBLEVEL (x in 2.6.x.y) until no more patch files are found;
  53# however, EXTRAVERSION (y in 2.6.x.y) is never automatically incremented
  54# but must be specified fully.
  55#
  56# patch-kernel does not normally support reverse patching, but does so when
  57# applying EXTRAVERSION (x.y) patches, so that moving from 2.6.11.y to 2.6.11.z
  58# is easy and handled by the script (reverse 2.6.11.y and apply 2.6.11.z).
  59#       Randy Dunlap <rdunlap@xenotime.net>, 2005-APR-08.
  60
  61PNAME=patch-kernel
  62
  63# Set directories from arguments, or use defaults.
  64sourcedir=${1-/usr/src/linux}
  65patchdir=${2-.}
  66stopvers=${3-default}
  67
  68if [ "$1" = -h -o "$1" = --help -o ! -r "$sourcedir/Makefile" ]; then
  69cat << USAGE
  70usage: $PNAME [-h] [ sourcedir [ patchdir [ stopversion ] [ -acxx ] ] ]
  71  source directory defaults to /usr/src/linux,
  72  patch directory defaults to the current directory,
  73  stopversion defaults to <all in patchdir>.
  74USAGE
  75exit 1
  76fi
  77
  78# See if we have any -ac options
  79for PARM in $*
  80do
  81  case $PARM in
  82          -ac*)
  83                  gotac=$PARM;
  84
  85        esac;
  86done
  87
  88# ---------------------------------------------------------------------------
  89# arg1 is filename
  90noFile () {
  91        echo "cannot find patch file: ${patch}"
  92        exit 1
  93}
  94
  95# ---------------------------------------------------------------------------
  96backwards () {
  97        echo "$PNAME does not support reverse patching"
  98        exit 1
  99}
 100
 101# ---------------------------------------------------------------------------
 102# Find a file, first parameter is basename of file
 103# it tries many compression mechanisms and sets variables to say how to get it
 104findFile () {
 105  filebase=$1;
 106
 107  if [ -r ${filebase}.gz ]; then
 108                ext=".gz"
 109                name="gzip"
 110                uncomp="gunzip -dc"
 111  elif [ -r ${filebase}.bz  ]; then
 112                ext=".bz"
 113                name="bzip"
 114                uncomp="bunzip -dc"
 115  elif [ -r ${filebase}.bz2 ]; then
 116                ext=".bz2"
 117                name="bzip2"
 118                uncomp="bunzip2 -dc"
 119  elif [ -r ${filebase}.zip ]; then
 120                ext=".zip"
 121                name="zip"
 122                uncomp="unzip -d"
 123  elif [ -r ${filebase}.Z ]; then
 124                ext=".Z"
 125                name="uncompress"
 126                uncomp="uncompress -c"
 127  elif [ -r ${filebase} ]; then
 128                ext=""
 129                name="plaintext"
 130                uncomp="cat"
 131  else
 132        return 1;
 133  fi
 134
 135  return 0;
 136}
 137
 138# ---------------------------------------------------------------------------
 139# Apply a patch and check it goes in cleanly
 140# First param is patch name (e.g. patch-2.4.9-ac5) - without path or extension
 141
 142applyPatch () {
 143  echo -n "Applying $1 (${name})... "
 144  if $uncomp ${patchdir}/$1${ext} | patch -p1 -s -N -E -d $sourcedir
 145  then
 146    echo "done."
 147  else
 148    echo "failed.  Clean up yourself."
 149    return 1;
 150  fi
 151  if [ "`find $sourcedir/ '(' -name '*.rej' -o -name '.*.rej' ')' -print`" ]
 152  then
 153    echo "Aborting.  Reject files found."
 154    return 1;
 155  fi
 156  # Remove backup files
 157  find $sourcedir/ '(' -name '*.orig' -o -name '.*.orig' ')' -exec rm -f {} \;
 158 
 159  return 0;
 160}
 161
 162# ---------------------------------------------------------------------------
 163# arg1 is patch filename
 164reversePatch () {
 165        echo -n "Reversing $1 (${name}) ... "
 166        if $uncomp ${patchdir}/"$1"${ext} | patch -p1 -Rs -N -E -d $sourcedir
 167        then
 168                echo "done."
 169        else
 170                echo "failed.  Clean it up."
 171                exit 1
 172        fi
 173        if [ "`find $sourcedir/ '(' -name '*.rej' -o -name '.*.rej' ')' -print`" ]
 174        then
 175                echo "Aborting.  Reject files found."
 176                return 1
 177        fi
 178        # Remove backup files
 179        find $sourcedir/ '(' -name '*.orig' -o -name '.*.orig' ')' -exec rm -f {} \;
 180
 181        return 0
 182}
 183
 184# set current VERSION, PATCHLEVEL, SUBLEVEL, EXTRAVERSION
 185# force $TMPFILEs below to be in local directory: a slash character prevents
 186# the dot command from using the search path.
 187TMPFILE=`mktemp ./.tmpver.XXXXXX` || { echo "cannot make temp file" ; exit 1; }
 188grep -E "^(VERSION|PATCHLEVEL|SUBLEVEL|EXTRAVERSION)" $sourcedir/Makefile > $TMPFILE
 189tr -d [:blank:] < $TMPFILE > $TMPFILE.1
 190. $TMPFILE.1
 191rm -f $TMPFILE*
 192if [ -z "$VERSION" -o -z "$PATCHLEVEL" -o -z "$SUBLEVEL" ]
 193then
 194    echo "unable to determine current kernel version" >&2
 195    exit 1
 196fi
 197
 198NAME=`grep ^NAME $sourcedir/Makefile`
 199NAME=${NAME##*=}
 200
 201echo "Current kernel version is $VERSION.$PATCHLEVEL.$SUBLEVEL${EXTRAVERSION} ($NAME)"
 202
 203# strip EXTRAVERSION to just a number (drop leading '.' and trailing additions)
 204EXTRAVER=
 205if [ x$EXTRAVERSION != "x" ]
 206then
 207        EXTRAVER=${EXTRAVERSION#.}
 208        EXTRAVER=${EXTRAVER%%[[:punct:]]*}
 209        #echo "$PNAME: changing EXTRAVERSION from $EXTRAVERSION to $EXTRAVER"
 210fi
 211
 212#echo "stopvers=$stopvers"
 213if [ $stopvers != "default" ]; then
 214        STOPSUBLEVEL=`echo $stopvers | cut -d. -f3`
 215        STOPEXTRA=`echo $stopvers | cut -d. -f4`
 216        STOPFULLVERSION=${stopvers%%.$STOPEXTRA}
 217        #echo "#___STOPSUBLEVEL=/$STOPSUBLEVEL/, STOPEXTRA=/$STOPEXTRA/"
 218else
 219        STOPSUBLEVEL=9999
 220        STOPEXTRA=9999
 221fi
 222
 223# This all assumes a 2.6.x[.y] kernel tree.
 224# Don't allow backwards/reverse patching.
 225if [ $STOPSUBLEVEL -lt $SUBLEVEL ]; then
 226        backwards
 227fi
 228
 229if [ x$EXTRAVER != "x" ]; then
 230        CURRENTFULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL.$EXTRAVER"
 231else
 232        CURRENTFULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
 233fi
 234
 235if [ x$EXTRAVER != "x" ]; then
 236        echo "backing up to: $VERSION.$PATCHLEVEL.$SUBLEVEL"
 237        patch="patch-${CURRENTFULLVERSION}"
 238        findFile $patchdir/${patch} || noFile ${patch}
 239        reversePatch ${patch} || exit 1
 240fi
 241
 242# now current is 2.6.x, with no EXTRA applied,
 243# so update to target SUBLEVEL (2.6.SUBLEVEL)
 244# and then to target EXTRAVER (2.6.SUB.EXTRAVER) if requested.
 245# If not ending sublevel is specified, it is incremented until
 246# no further sublevels are found.
 247
 248if [ $STOPSUBLEVEL -gt $SUBLEVEL ]; then
 249while :                         # incrementing SUBLEVEL (s in v.p.s)
 250do
 251    CURRENTFULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
 252    EXTRAVER=
 253    if [ x$STOPFULLVERSION = x$CURRENTFULLVERSION ]; then
 254        echo "Stopping at $CURRENTFULLVERSION base as requested."
 255        break
 256    fi
 257
 258    SUBLEVEL=$(($SUBLEVEL + 1))
 259    FULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
 260    #echo "#___ trying $FULLVERSION ___"
 261
 262    if [ $(($SUBLEVEL)) -gt $(($STOPSUBLEVEL)) ]; then
 263        echo "Stopping since sublevel ($SUBLEVEL) is beyond stop-sublevel ($STOPSUBLEVEL)"
 264        exit 1
 265    fi
 266
 267    patch=patch-$FULLVERSION
 268    # See if the file exists and find extension
 269    findFile $patchdir/${patch} || noFile ${patch}
 270
 271    # Apply the patch and check all is OK
 272    applyPatch $patch || break
 273done
 274#echo "#___sublevel all done"
 275fi
 276
 277# There is no incremental searching for extraversion...
 278if [ "$STOPEXTRA" != "" ]; then
 279while :                         # just to allow break
 280do
 281# apply STOPEXTRA directly (not incrementally) (x in v.p.s.x)
 282        FULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL.$STOPEXTRA"
 283        #echo "#... trying $FULLVERSION ..."
 284        patch=patch-$FULLVERSION
 285
 286        # See if the file exists and find extension
 287        findFile $patchdir/${patch} || noFile ${patch}
 288
 289        # Apply the patch and check all is OK
 290        applyPatch $patch || break
 291        #echo "#___extraver all done"
 292        break
 293done
 294fi
 295
 296if [ x$gotac != x ]; then
 297  # Out great user wants the -ac patches
 298        # They could have done -ac (get latest) or -acxx where xx=version they want
 299        if [ $gotac = "-ac" ]; then
 300          # They want the latest version
 301                HIGHESTPATCH=0
 302                for PATCHNAMES in $patchdir/patch-${CURRENTFULLVERSION}-ac*\.*
 303                do
 304                        ACVALUE=`echo $PATCHNAMES | sed -e 's/^.*patch-[0-9.]*-ac\([0-9]*\).*/\1/'`
 305                        # Check it is actually a recognised patch type
 306                        findFile $patchdir/patch-${CURRENTFULLVERSION}-ac${ACVALUE} || break
 307
 308                  if [ $ACVALUE -gt $HIGHESTPATCH ]; then
 309                          HIGHESTPATCH=$ACVALUE
 310                  fi
 311                done
 312
 313                if [ $HIGHESTPATCH -ne 0 ]; then
 314                        findFile $patchdir/patch-${CURRENTFULLVERSION}-ac${HIGHESTPATCH} || break
 315                        applyPatch patch-${CURRENTFULLVERSION}-ac${HIGHESTPATCH}
 316                else
 317                  echo "No -ac patches found"
 318                fi
 319        else
 320          # They want an exact version
 321                findFile $patchdir/patch-${CURRENTFULLVERSION}${gotac} || {
 322                  echo "Sorry, I couldn't find the $gotac patch for $CURRENTFULLVERSION.  Hohum."
 323                        exit 1
 324                }
 325                applyPatch patch-${CURRENTFULLVERSION}${gotac}
 326        fi
 327fi
 328
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