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smart-apply-patch.sh
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Wed, Feb 26, 00:31

smart-apply-patch.sh
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#!/usr/bin/env bash
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
set -e
PATCH_FILE=$1
if [ -z "$PATCH_FILE" ]; then
echo usage: $0 patch-file
exit 1
fi
PATCH=${PATCH:-patch} # allow overriding patch binary
# Cleanup handler for temporary files
TOCLEAN=""
cleanup() {
rm $TOCLEAN
exit $1
}
trap "cleanup 1" HUP INT QUIT TERM
# Allow passing "-" for stdin patches
if [ "$PATCH_FILE" == "-" ]; then
PATCH_FILE=/tmp/tmp.in.$$
cat /dev/fd/0 > $PATCH_FILE
TOCLEAN="$TOCLEAN $PATCH_FILE"
fi
# Come up with a list of changed files into $TMP
TMP=/tmp/tmp.paths.$$
TOCLEAN="$TOCLEAN $TMP"
if $PATCH -p0 -E --dry-run < $PATCH_FILE 2>&1 > $TMP; then
PLEVEL=0
#if the patch applied at P0 there is the possability that all we are doing
# is adding new files and they would apply anywhere. So try to guess the
# correct place to put those files.
TMP2=/tmp/tmp.paths.2.$$
TOCLEAN="$TOCLEAN $TMP2"
egrep '^patching file |^checking file ' $TMP | awk '{print $3}' | grep -v /dev/null | sort | uniq > $TMP2
if [ ! -s $TMP2 ]; then
echo "Error: Patch dryrun couldn't detect changes the patch would make. Exiting."
cleanup 1
fi
#first off check that all of the files do not exist
FOUND_ANY=0
for CHECK_FILE in $(cat $TMP2)
do
if [[ -f $CHECK_FILE ]]; then
FOUND_ANY=1
fi
done
if [[ "$FOUND_ANY" = "0" ]]; then
#all of the files are new files so we have to guess where the correct place to put it is.
# if all of the lines start with a/ or b/, then this is a git patch that
# was generated without --no-prefix
if ! grep -qv '^a/\|^b/' $TMP2 ; then
echo Looks like this is a git patch. Stripping a/ and b/ prefixes
echo and incrementing PLEVEL
PLEVEL=$[$PLEVEL + 1]
sed -i -e 's,^[ab]/,,' $TMP2
fi
PREFIX_DIRS_AND_FILES=$(cut -d '/' -f 1 | sort | uniq)
# if we are at the project root then nothing more to do
if [[ -d hadoop-common-project ]]; then
echo Looks like this is being run at project root
# if all of the lines start with hadoop-common/, hadoop-hdfs/, hadoop-yarn/ or hadoop-mapreduce/, this is
# relative to the hadoop root instead of the subproject root, so we need
# to chop off another layer
elif [[ "$PREFIX_DIRS_AND_FILES" =~ ^(hadoop-common-project|hadoop-hdfs-project|hadoop-yarn-project|hadoop-mapreduce-project)$ ]]; then
echo Looks like this is relative to project root. Increasing PLEVEL
PLEVEL=$[$PLEVEL + 1]
elif ! echo "$PREFIX_DIRS_AND_FILES" | grep -vxq 'hadoop-common-project\|hadoop-hdfs-project\|hadoop-yarn-project\|hadoop-mapreduce-project' ; then
echo Looks like this is a cross-subproject patch. Try applying from the project root
cleanup 1
fi
fi
elif $PATCH -p1 -E --dry-run < $PATCH_FILE 2>&1 > /dev/null; then
PLEVEL=1
elif $PATCH -p2 -E --dry-run < $PATCH_FILE 2>&1 > /dev/null; then
PLEVEL=2
else
echo "The patch does not appear to apply with p0 to p2";
cleanup 1;
fi
echo Going to apply patch with: $PATCH -p$PLEVEL
$PATCH -p$PLEVEL -E < $PATCH_FILE
cleanup $?

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