#!/bin/bash

if [ ! -f /usr/bin/curl ]; then

  echo yum install curl

  exit 0

fi

# Current kernel bits

if [ `grep -c ^patch upstream` -ge 1 ]; then

  export OLD=`grep ^patch upstream | tail -n1 | sed s/patch-// | sed s/\.bz2//`

else

  export OLD=`grep linux-2.6 upstream | tail -n1 | sed s/linux-// | sed s/\.tar\.bz2//`

fi

export OLDBASE=`echo $OLD | sed s/-/\ /g | sed s/2\.6\.// | awk '{ print $1 }'`

if [ `echo $OLD | grep -c rc` -ge 1 ]; then

  export OLDRC=`echo $OLD | sed s/-/\ /g | sed s/rc// | awk '{ print $2 }'`

  if [ `echo $OLD | grep -c git` -ge 1 ]; then

    export OLDGIT=`echo $OLD | sed s/-/\ /g | sed s/git// | awk '{ print $3 }'`

  else

    export OLDGIT=0

  fi

else

  export OLDRC=0

  if [ `echo $OLD | grep -c git` -ge 1 ]; then

    export OLDGIT=`echo $OLD | sed s/-/\ /g | sed s/git// | awk '{ print $2 }'`

  else

    export OLDGIT=0

  fi

fi

# Is there a new snapshot or prepatch ?

NEW=`curl -s http://www.kernel.org/kdist/finger_banner | grep "latest snapshot 2.6 version"`

if [ -z "$NEW" ] ; then

  NEW=`curl -s http://www.kernel.org/kdist/finger_banner | grep "latest mainline 2.6 version"`

  if [ -z "$NEW" ] ; then

    if [ "$OLDRC" -ne 0 ] ; then

      NEW=`curl -s http://www.kernel.org/kdist/finger_banner | grep "latest stable 2.6." | head -n1`

    else

      echo "No new rc or git snapshot of stable branch".

      exit 0

    fi

  fi

fi

export N=`echo $NEW | awk '{ print $11 }'`

if [ -z "$N" ]; then

  # "Stable version"

  export NEW=`echo $NEW | awk '{ print $10 }'`

else

  export NEW=`echo $NEW | awk '{ print $11 }'`

fi

export NEWBASE=`echo $NEW | sed s/-/\ /g | sed s/2\.6\.// | awk '{ print $1 }'`

if [ `echo $NEW | grep -c rc` -ge 1 ]; then

  export NEWRC=`echo $NEW | sed s/-/\ /g | sed s/rc// | awk '{ print $2 }'`

  if [ `echo $NEW | grep -c git` -ge 1 ]; then

    export NEWGIT=`echo $NEW | sed s/-/\ /g | sed s/git// | awk '{ print $3 }'`

  else

    export NEWGIT=0

  fi

else

  export NEWRC=0

  if [ `echo $NEW | grep -c git` -ge 1 ]; then

    export NEWGIT=`echo $NEW | sed s/-/\ /g | sed s/git// | awk '{ print $2 }'`

  else

    export NEWGIT=0

  fi

fi

echo "OLD kernel was $OLD  BASE=$OLDBASE RC=$OLDRC GIT=$OLDGIT"

echo "NEW kernel is  $NEW  BASE=$NEWBASE RC=$NEWRC GIT=$NEWGIT"

if [ "$OLDRC" -eq 0 -a "$OLDGIT" -eq 0 -a "$OLDGIT" -ne "$NEWGIT" ]; then

  echo "Rebasing from a stable release to a new git snapshot"

  perl -p -i -e 's/^%define\ released_kernel\ 1/\%define\ released_kernel\ 0/' kernel.spec

  perl -p -i -e 's/^%define\ rawhide_skip_docs\ 1/\%define\ rawhide_skip_docs\ 0/' kernel.spec

  # force these to zero in this case, they may not have been when we rebased to stable

  perl -p -i -e 's/^%define\ rcrev.*/\%define\ rcrev\ 0/' kernel.spec

  perl -p -i -e 's/^%define\ gitrev.*/\%define\ gitrev\ 0/' kernel.spec

fi

# make sure we build docs at least once per -rc kernel, shut it off otherwise

if [ "$OLDRC" -ne 0 -a "$NEWRC" -gt "$OLDRC" ]; then

  perl -p -i -e 's/^%define\ rawhide_skip_docs\ 1/\%define\ rawhide_skip_docs\ 0/' kernel.spec

else

  if [ "$NEWRC" -eq "$OLDRC" -a "$NEWGIT" -gt "$OLDGIT" ]; then

    # common case, same -rc, new -git, make sure docs are off.

    perl -p -i -e 's/^%define\ rawhide_skip_docs\ 0/\%define\ rawhide_skip_docs\ 1/' kernel.spec

  fi

fi

if [ "$NEWRC" -eq 0 -a "$NEWGIT" -eq 0 ]; then

  echo "Rebasing from -rc to final release."

  perl -p -i -e 's/^%define\ released_kernel\ 0/\%define\ released_kernel\ 1/' kernel.spec

  perl -p -i -e 's/^%define\ rawhide_skip_docs\ 1/\%define\ rawhide_skip_docs\ 0/' kernel.spec

  export OLD_TARBALL_BASE=$(($OLDBASE-1))

  perl -p -i -e 's/^%define\ base_sublevel\ $ENV{OLD_TARBALL_BASE}/%define\ base_sublevel\ $ENV{NEWBASE}/' kernel.spec

  perl -p -i -e 's/^%define\ rcrev.*/\%define\ rcrev\ 0/' kernel.spec

  perl -p -i -e 's/^%define\ gitrev.*/\%define\ gitrev\ 0/' kernel.spec

  grep -v kernel-2.6.$OLD_TARBALL_BASE .cvsignore >.cvsignore.tmp ; mv .cvsignore.tmp .cvsignore

  echo kernel-2.6.$NEWBASE >> .cvsignore

  for i in upstream sources .cvsignore

  do

   grep -v linux-2.6.$OLD_TARBALL_BASE.tar.bz2 $i > .$i.tmp; mv .$i.tmp $i

   grep -v patch-2.6.$OLDBASE-rc$OLDRC.bz2 $i > .$i.tmp; mv .$i.tmp $i

   grep -v patch-2.6.$OLDBASE-rc$OLDRC-git$OLDGIT.bz2 $i > .$i.tmp; mv .$i.tmp $i

  done

  echo linux-2.6.$NEWBASE.tar.bz2 >> upstream

  rm -f linux-2.6.$OLD_TARBALL_BASE.tar.bz2

  rm -f linux-2.6.$OLD_TARBALL_BASE.tar.bz2.sign

  rm -f patch-2.6.$OLDBASE-rc$OLDRC.bz2

  rm -f patch-2.6.$OLDBASE-rc$OLDRC.bz2.sign

  rm -f patch-2.6.$OLDBASE-rc$OLDRC-git$OLDGIT.bz2

  rm -f patch-2.6.$OLDBASE-rc$OLDRC-git$OLDGIT.bz2.sign

  cvs remove linux-2.6.$OLD_TARBALL_BASE.tar.bz2.sign

  cvs remove patch-2.6.$OLDBASE-rc$OLDRC.bz2.sign

  cvs remove patch-2.6.$OLDBASE-rc$OLDRC-git$OLDGIT.bz2.sign

  make download

  make upload FILES=linux-$NEW.tar.bz2

  cvs add linux-$NEW.tar.bz2.sign

  bumpspecfile.py kernel.spec "- $NEW"

  make clog

  echo FIXME! Fix up fedora_cvs_origin

  make verrel

  exit 1

fi

if [ "$OLDRC" != "$NEWRC" ]; then

  echo "Different rc. Rebasing from $OLDRC to $NEWRC"

  perl -p -i -e 's/^%define\ rcrev.*/\%define\ rcrev\ $ENV{"NEWRC"}/' kernel.spec

  perl -p -i -e 's/$ENV{OLDBASE}-rc$ENV{OLDRC}.bz2/$ENV{NEWBASE}-rc$ENV{NEWRC}.bz2/' .cvsignore

  perl -p -i -e 's/$ENV{OLDBASE}-rc$ENV{OLDRC}.bz2/$ENV{NEWBASE}-rc$ENV{NEWRC}.bz2/' upstream

  grep -v patch-2.6.$OLDBASE-rc$OLDRC.bz2 sources > .sources.tmp; mv .sources.tmp sources

  grep -v patch-2.6.$OLDBASE-rc$OLDRC-git$OLDGIT.bz2 .cvsignore >.cvsignore.tmp ; mv .cvsignore.tmp .cvsignore

  if [ `grep -c patch-2.6.$NEWBASE-rc$NEWRC.bz2 upstream` -eq 0 ]; then

    echo patch-2.6.$NEWBASE-rc$NEWRC.bz2 >> .cvsignore

    echo patch-2.6.$NEWBASE-rc$NEWRC.bz2 >> upstream

  fi

  rm -f patch-2.6.$OLDBASE-rc$OLDRC.bz2

  rm -f patch-2.6.$OLDBASE-rc$OLDRC.bz2.sign

  cvs remove patch-2.6.$OLDBASE-rc$OLDRC.bz2.sign

  make download

  make upload FILES=patch-2.6.$NEWBASE-rc$NEWRC.bz2

  cvs add patch-2.6.$NEWBASE-rc$NEWRC.bz2.sign

  # Another awkward (albeit unlikely) corner case.

  # Moving from say 26-rc3-git1 to 26-rc4-git1

  # The above will grab the new -rc, but the below will

  # think that the -git hasn't changed.

  # Fudge around this, by pretending the old git was something crazy.

  OLDGIT=99

fi

if [ "$OLDGIT" != "$NEWGIT" ]; then

  if [ "$OLDRC" -eq 0 -a "$OLDGIT" -eq 0 ]; then

    echo "Rebasing to pre-rc git$NEWGIT"

  else

    echo "Different git. Rebasing from git$OLDGIT to git$NEWGIT"

  fi

  perl -p -i -e 's/^%define\ gitrev.*/\%define\ gitrev\ $ENV{"NEWGIT"}/' kernel.spec

  if [ "$OLDGIT" -ne 0 ]; then

    if [ "$NEWGIT" -ne 0 ]; then

      perl -p -i -e 's/$ENV{OLD}/$ENV{NEW}/' .cvsignore

      perl -p -i -e 's/$ENV{OLD}/$ENV{NEW}/' upstream

    fi

    grep -v patch-$OLD.bz2 sources > .sources.tmp; mv .sources.tmp sources

    grep -v patch-$OLD.bz2 upstream > .upstream.tmp; mv .upstream.tmp upstream

  else

    echo patch-$NEW.bz2 >> .cvsignore

    echo patch-$NEW.bz2 >> upstream

  fi

  make download

  make upload FILES=patch-$NEW.bz2

  cvs add patch-$NEW.bz2.sign

  if [ "$OLDGIT" -ne 0 ]; then

    rm -f patch-$OLD.bz2

    rm -f patch-$OLD.bz2.sign

    cvs remove patch-$OLD.bz2.sign

  fi

fi

if [ "$OLDRC" != "$NEWRC" -o "$OLDGIT" != "$NEWGIT" ]; then

  perl -p -i -e 's|^ApplyPatch\ git-linus.diff|#ApplyPatch\ git-linus.diff|' kernel.spec

  > git-linus.diff

  bumpspecfile.py kernel.spec "- $NEW"

  make clog

  exit 1

else

  exit 0

fi