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#!/bin/bash -eu
# Copyright (C) 2023 The Android Open Source Project
#
# 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.
# Verifies that various intermediate outputs of the build have deterministic
# outputs. Nondeterministic intermediate outputs have incremental performance
# implications, so this is a critical test even if the determinism if the final
# outputs is not in question.
#
# Determinism is verified by running several builds and comparing checksums of
# outputs. This may provides confidence in determinism, but does not guarantee
# it. "Flakiness" in this test should thus be treated as indicative of a
# failure, and investigated promptly.
if [[ -z ${OUT_DIR+x} ]]; then
OUT_DIR="out"
fi
if [[ -z ${DIST_DIR+x} ]]; then
echo "DIST_DIR not set. Using ${OUT_DIR}/dist. This should only be used for manual developer testing."
DIST_DIR="${OUT_DIR}/dist"
fi
if [[ -z ${TARGET_PRODUCT+x} ]]; then
echo "TARGET_PRODUCT not set. Using aosp_arm64"
TARGET_PRODUCT=aosp_arm64
fi
if [[ -z ${TARGET_BUILD_VARIANT+x} ]]; then
echo "TARGET_BUILD_VARIANT not set. Using userdebug"
TARGET_BUILD_VARIANT=userdebug
fi
UNAME="$(uname)"
case "$UNAME" in
Linux)
PREBUILTS="prebuilts/build-tools/path/linux-x86"
;;
Darwin)
PREBUILTS="prebuilts/build-tools/path/darwin-x86"
;;
*)
exit 1
;;
esac
function clean_build {
build/soong/soong_ui.bash --make-mode clean
# Generate the ninja file with default setting. We expect Bazel to be enabled by
# default.
build/soong/soong_ui.bash --make-mode \
--mk-metrics \
BAZEL_STARTUP_ARGS="--max_idle_secs=5" \
BAZEL_BUILD_ARGS="--color=no --curses=no --show_progress_rate_limit=5" \
TARGET_PRODUCT=${TARGET_PRODUCT} \
TARGET_BUILD_VARIANT=${TARGET_BUILD_VARIANT} \
nothing \
dist DIST_DIR=$DIST_DIR
}
function save_hash {
local -r filepath="$1"
find $OUT_DIR/soong/workspace -type f,l -iname "BUILD.bazel" -o -iname "*.bzl" | xargs "${PREBUILTS}"/md5sum > $filepath
find $OUT_DIR/soong/soong_injection -type f,l | xargs "${PREBUILTS}"/md5sum >> $filepath
"${PREBUILTS}"/md5sum $OUT_DIR/soong/Android-${TARGET_PRODUCT}.mk >> $filepath
if [[ -z ${SKIP_NINJA_CHECK+x} ]]; then
"${PREBUILTS}"/md5sum $OUT_DIR/soong/build.ninja >> $filepath
fi
}
TESTDIR=$(mktemp -t testdir.XXXXXX -d)
FIRST_FILE=$TESTDIR/first_hashes
TEST_FILE=$TESTDIR/hashes_to_test
clean_build
save_hash $FIRST_FILE
for i in {1..4} ; do
clean_build
save_hash $TEST_FILE
if cmp -s "$FIRST_FILE" "$TEST_FILE"
then
echo "Comparison $i succeeded."
else
cp $FIRST_FILE $TEST_FILE $DIST_DIR
>&2 echo "Comparison $i failed. This likely indicates nondeterminism in the differing files."
>&2 echo "\n\nFirst file hashes:\n"
>&2 cat $FIRST_FILE
>&2 echo "\n\nRerun $i:\n"
>&2 cat $TEST_FILE
exit 1
fi
done
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