4.9-rt: add script to auto create bisect branches
Sample usage:
mkdir rt-test
cd rt-test
# clone mainline or clone from a local copy with >=4.9 tags in it.
git clone /path/to/my/existing/mainline/linux linux-rt-bisect
git clone git://git.kernel.org/pub/scm/linux/kernel/git/paulg/4.9-rt-patches.git
cd linux-rt-bisect
../4.9-rt-patches.git/scripts/create-branches.sh
diff --git a/scripts/create-branches.sh b/scripts/create-branches.sh
new file mode 100755
index 0000000..b9da8a8
--- /dev/null
+++ b/scripts/create-branches.sh
@@ -0,0 +1,157 @@
+#!/bin/bash
+
+# Create an -rt branch on top of each incremental merge in mainline by Linus.
+
+# Assumes patches for merge "v4.x-gabcdef" are on tag "rt-v4.x-gabcdef" in
+# the $PATCHES repo.
+
+START=v4.8
+END=v4.9
+RC=8
+
+# Collect path info and then clone ourselves and fork.
+if [ -z "$KERNEL" ]; then
+ echo "Path to existing mainline kernel repo where you want the rt bisect branches."
+ echo -n "(e.g. \"/home/paul/git/linux-rt-bisect\") Default is \"./\": "
+ read KERNEL
+ if [ -z "$KERNEL" ]; then
+ KERNEL="./"
+ fi
+
+ KERNEL=`readlink -f $KERNEL`
+ if [ ! -d "$KERNEL"/.git ]; then
+ echo Entry $KERNEL does not appear to be a git repo
+ exit 1
+ fi
+
+ PATCHES=`dirname $0 | sed 's/scripts/patches/'`
+ PATCHES=`readlink -f $PATCHES`
+
+ # We'll check out tags where we don't exist; so copy ourselves.
+ SCRIPT=`mktemp`
+ echo '#!/bin/bash' > $SCRIPT
+ echo SCRIPT=$SCRIPT >> $SCRIPT
+ echo KERNEL=$KERNEL >> $SCRIPT
+ echo PATCHES=$PATCHES >> $SCRIPT
+ cat $0 | grep -v '^#!/bin/bash' >> $SCRIPT
+ chmod +x $SCRIPT
+ exec $SCRIPT
+fi
+
+MERGES=`mktemp`
+DMERGES=`mktemp`
+MAPPING=`mktemp`
+LOG=`mktemp`
+
+echo Logging debug and errors to $LOG
+# echo Mapping of merges to patch tags in $MAPPING
+
+cd $PATCHES > $LOG 2>&1
+if [ $? != 0 ]; then
+ echo Can not cd into $PATCHES
+ exit 1
+fi
+
+git checkout $END-rt >> $LOG 2>&1
+if [ $? != 0 ];then
+ echo Checkout of $END-rt in $PATCHES failed
+ exit 1
+fi
+
+if [ ! -f $PATCHES/series ]; then
+ echo Can not find series file in $PATCHES
+ exit 1
+fi
+
+cd $KERNEL >> $LOG 2>&1
+if [ $? != 0 ]; then
+ echo Can not cd into $KERNEL
+ exit 1
+fi
+
+# Sanity check
+git rev-parse $START >> $LOG 2>&1
+if [ $? != 0 ]; then
+ echo Cant resolve $START in $KERNEL
+ exit 1
+fi
+git rev-parse $END >> $LOG 2>&1
+if [ $? != 0 ]; then
+ echo Cant resolve $END in $KERNEL
+ exit 1
+fi
+
+echo "Getting merges.."
+git log --oneline --merges --author=Torvalds --reverse ^$START $END-rc1 | awk '{print $1}' > $MERGES
+
+# post rc1 we dont do it per merge, just per rc tag.
+for i in `seq $RC` ; do echo $END-rc$i >> $MERGES ; done
+echo $END >> $MERGES
+MCOUNT=`cat $MERGES | wc -l`
+
+echo -n "Describing $MCOUNT merges"
+for i in `cat $MERGES` ; do
+ git describe $i >> $DMERGES
+ echo -n .
+done
+echo done.
+
+echo $START $START.0-rt > $MAPPING
+PTAG=rt-START.0
+
+cd $PATCHES
+# echo "Mapping $MCOUNT merges to patch repo tags."
+for i in `cat $DMERGES` ; do
+
+ git tag | grep -q $i
+
+ if [ $? = 0 ]; then # patch tag match for this merge
+ PTAG=rt-$i
+ fi
+
+ echo $i $PTAG >> $MAPPING
+done
+
+HERE=1
+for i in `cat $DMERGES` ; do
+
+ PTAG=`grep "^$i " $MAPPING | awk '{print $2}'`
+ echo "[$HERE/$MCOUNT] Applying $PTAG to $i in $KERNEL" >> $LOG
+
+ cd $PATCHES
+ git checkout $PTAG >> $LOG 2>&1
+ if [ $? != 0 ];then
+ echo Checkout of $PTAG in $PATCHES failed
+ exit 1
+ fi
+
+ cd $KERNEL
+ git checkout -b $i-rt $i >> $LOG 2>&1
+ if [ $? != 0 ];then
+ echo New branch of $i-rt in $KERNEL failed
+ exit
+ fi
+
+ COUNT=`cat $PATCHES/series | grep '^[a-zA-Z0-9_]' | wc -l`
+ echo "[$HERE/$MCOUNT] Applying $PTAG ($COUNT patches) to $i baseline"
+ for i in `cat $PATCHES/series | grep '^[a-zA-Z0-9_]'`; do
+ git am $PATCHES/$i >> $LOG 2>&1
+ if [ $? != 0 ]; then
+ echo Git am of $PATCHES/$i failed
+ exit 1
+ fi
+ done
+
+ HERE=$[$HERE+1]
+done
+
+cd $PATCHES
+git checkout $END-rt >> $LOG 2>&1
+cd $KERNEL
+
+# rm -f $LOG
+rm -f $MERGES
+rm -f $DMERGES
+rm -f $MAPPING
+# Finally, remove ourselves.
+rm -f $SCRIPT
