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#!/bin/bash
#
# Copyright 2018 The Bazel Authors. All rights reserved.
#
# 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 -eu
USAGE='bazel-bisect.sh GOOD_COMMIT BAD_COMMIT [<bazel arguments>...]'
DESCRIPTION='
Downloads a fresh copy of the Bazel source and runs git bisect from the
specified commits, testing by running the given bazel command in the
current working directory.'
function usage() {
echo "$USAGE" "$DESCRIPTION" >&2
}
# Configuration params. Export these in your bashrc to set personal defaults.
# The source of Bazel code.
BAZEL_REPO=${BAZEL_REPO:-https://github.com/bazelbuild/bazel}
# Where to keep the Bazel repository. If you make changes here, be warned that
# this script may overwrite or lose them.
BAZEL_DIR=${BAZEL_DIR:-$HOME/os-bazel-bisect}
# Bazel to use to build local bazel binaries.
BAZEL_BINARY=${BAZEL_BINARY:-$(which bazel)}
# Collect the arguments.
if [ "$#" -lt 3 ]; then
usage
exit 1
fi
# Collect the arguments.
#
GOOD_COMMIT="$1"
shift
BAD_COMMIT="$1"
shift
BAZEL_ARGUMENTS="$@"
echo "Bisecting bazel from good $GOOD_COMMIT to bad $BAD_COMMIT: bazel $BAZEL_ARGUMENTS"
# Check out and update Bazel.
if [ ! -d "$BAZEL_DIR" ]; then
git clone "$BAZEL_REPO" "$BAZEL_DIR"
fi
# Ensure the repository is up to date.
(
cd "$BAZEL_DIR"
git fetch --tags
git checkout master
)
# Run the actual bisect.
WORKING_DIR="$PWD"
(
BISECT_SCRIPT=/tmp/bisect.sh
TMP_BIN=/tmp/bazel.bisect
cat >$BISECT_SCRIPT <<EOF
#!/bin/bash
set -eu
"$BAZEL_BINARY" build //src:bazel || exit 1
cp -f bazel-bin/src/bazel $TMP_BIN
cd "$WORKING_DIR"
exec "$TMP_BIN" $BAZEL_ARGUMENTS
EOF
chmod +x "$BISECT_SCRIPT"
cd "$BAZEL_DIR"
git bisect start
git bisect good "$GOOD_COMMIT"
git bisect bad "$BAD_COMMIT"
result=0
git bisect run "$BISECT_SCRIPT" || result=$?
git bisect reset
exit $result
)
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