blob: 2a9dbd24dd4d3b9c309a4ba5641bf593b8544085 [file] [log] [blame]
#!/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
#
# Determine if the patch file is a git diff file with prefixes.
# These files are generated via "git diff" *without* the --no-prefix option.
#
# We can apply these patches more easily because we know that the a/ and b/
# prefixes in the "diff" lines stands for the project root directory.
# So we don't have to hunt for the project root.
# And of course, we know that the patch file was generated using git, so we
# know git apply can handle it properly.
#
# Arguments: file name.
# Return: 0 if it is a git diff; 1 otherwise.
#
is_git_diff_with_prefix() {
DIFF_TYPE="unknown"
while read -r line; do
if [[ "$line" =~ ^diff\ ]]; then
if [[ "$line" =~ ^diff\ \-\-git ]]; then
DIFF_TYPE="git"
else
return 1 # All diff lines must be diff --git lines.
fi
fi
if [[ "$line" =~ ^\+\+\+\ ]] ||
[[ "$line" =~ ^\-\-\-\ ]]; then
if ! [[ "$line" =~ ^....[ab]/ ]]; then
return 1 # All +++ and --- lines must start with a/ or b/.
fi
fi
done < $1
[ x$DIFF_TYPE == x"git" ] || return 1
return 0 # return true (= 0 in bash)
}
PATCH_FILE=$1
DRY_RUN=$2
if [ -z "$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.$$
cat /dev/fd/0 > $PATCH_FILE
TOCLEAN="$TOCLEAN $PATCH_FILE"
fi
# Special case for git-diff patches without --no-prefix
if is_git_diff_with_prefix "$PATCH_FILE"; then
GIT_FLAGS="--binary -p1 -v"
if [[ -z $DRY_RUN ]]; then
GIT_FLAGS="$GIT_FLAGS --stat --apply "
echo Going to apply git patch with: git apply "${GIT_FLAGS}"
else
GIT_FLAGS="$GIT_FLAGS --check "
fi
git apply ${GIT_FLAGS} "${PATCH_FILE}"
exit $?
fi
# Come up with a list of changed files into $TMP
TMP=/tmp/tmp.paths.$$
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
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
# If this is a dry run then exit instead of applying the patch
if [[ -n $DRY_RUN ]]; then
cleanup 0;
fi
echo Going to apply patch with: $PATCH -p$PLEVEL
$PATCH -p$PLEVEL -E < $PATCH_FILE
cleanup $?