#!/bin/bash
#
# Copyright 2019 The Abseil Authors.
#
# 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
#
#    https://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.

# This script that can be invoked to test abseil-cpp in a hermetic environment
# using a Docker image on Linux. You must have Docker installed to use this
# script.

set -euox pipefail

if [[ -z ${ABSEIL_ROOT:-} ]]; then
  ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
fi

if [[ -z ${STD:-} ]]; then
  STD="c++17 c++20 c++23"
fi

if [[ -z ${COMPILATION_MODE:-} ]]; then
  COMPILATION_MODE="fastbuild opt"
fi

if [[ -z ${EXCEPTIONS_MODE:-} ]]; then
  EXCEPTIONS_MODE="-fno-exceptions -fexceptions"
fi

source "${ABSEIL_ROOT}/ci/linux_docker_containers.sh"
readonly DOCKER_CONTAINER=${LINUX_CLANG_LATEST_CONTAINER}

# Print information about the environment.
docker run "${DOCKER_CONTAINER}" /usr/bin/fastfetch -c ci
docker run "${DOCKER_CONTAINER}" /opt/llvm/bin/clang -v
docker run "${DOCKER_CONTAINER}" cat /root/cached_bazel_versions

# USE_BAZEL_CACHE=1 only works on Kokoro.
# Without access to the credentials this won't work.
if [[ ${USE_BAZEL_CACHE:-0} -ne 0 ]]; then
  DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_KEYSTORE_DIR},target=/keystore,readonly ${DOCKER_EXTRA_ARGS:-}"
  # Bazel doesn't track changes to tools outside of the workspace
  # (e.g. /usr/bin/gcc), so by appending the docker container to the
  # remote_http_cache url, we make changes to the container part of
  # the cache key. Hashing the key is to make it shorter and url-safe.
  container_key=$(echo ${DOCKER_CONTAINER} | sha256sum | head -c 16)
  BAZEL_EXTRA_ARGS="--remote_cache=https://storage.googleapis.com/absl-bazel-remote-cache/${container_key} --google_credentials=/keystore/73103_absl-bazel-remote-cache ${BAZEL_EXTRA_ARGS:-}"
fi

# Avoid depending on external sites like GitHub by checking --distdir for
# external dependencies first.
# https://docs.bazel.build/versions/master/guide.html#distdir
if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -d "${KOKORO_GFILE_DIR}/distdir" ]]; then
  DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly ${DOCKER_EXTRA_ARGS:-}"
  BAZEL_EXTRA_ARGS="--distdir=/distdir ${BAZEL_EXTRA_ARGS:-}"
fi

# https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html#available-checks
readonly UBSAN_CHECKS="float-divide-by-zero,nullability,undefined"

for std in ${STD}; do
  for compilation_mode in ${COMPILATION_MODE}; do
    for exceptions_mode in ${EXCEPTIONS_MODE}; do
      echo "--------------------------------------------------------------------"
      time docker run \
        --env="USE_BAZEL_VERSION=9.1.0" \
        --env="CC=/opt/llvm/bin/clang" \
        --env="BAZEL_CXXOPTS=-std=${std}:-nostdinc++" \
        --env="BAZEL_LINKOPTS=-L/opt/llvm/lib/x86_64-unknown-linux-gnu:-lc++:-lc++abi:-lm:-Wl,-rpath=/opt/llvm/lib/x86_64-unknown-linux-gnu" \
        --env="CPLUS_INCLUDE_PATH=/opt/llvm/include/c++/v1:/opt/llvm/include/x86_64-unknown-linux-gnu/c++/v1/" \
        --mount type=bind,source="${ABSEIL_ROOT}",target=/abseil-cpp,readonly \
        --workdir=/abseil-cpp \
        --cap-add=SYS_PTRACE \
        --rm \
        ${DOCKER_EXTRA_ARGS:-} \
        ${DOCKER_CONTAINER} \
        /bin/bash --login -c "
        /usr/local/bin/bazel test ... \
          --compilation_mode=\"${compilation_mode}\" \
          --copt=\"${exceptions_mode}\" \
          --copt=\"-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG\" \
          --copt=\"-DGTEST_REMOVE_LEGACY_TEST_CASEAPI_=1\" \
          --copt=\"-fsanitize=address\" \
          --copt=\"-fsanitize=${UBSAN_CHECKS}\" \
          --copt=\"-fno-sanitize-recover=${UBSAN_CHECKS}\" \
          --copt=\"-fno-sanitize-blacklist\" \
          --copt=-Werror \
          --define=\"absl=1\" \
          --enable_bzlmod=true \
          --features=external_include_paths \
          --keep_going \
          --linkopt=\"-fsanitize=address\" \
          --linkopt=\"-fsanitize-link-c++-runtime\" \
          --per_file_copt=external/.*@-w \
          --show_timestamps \
          --test_env=\"ASAN_SYMBOLIZER_PATH=/opt/llvm/bin/llvm-symbolizer\" \
          --test_env=\"TZDIR=/abseil-cpp/absl/time/internal/cctz/testdata/zoneinfo\" \
          --test_env=\"UBSAN_OPTIONS=print_stacktrace=1\" \
          --test_env=\"UBSAN_SYMBOLIZER_PATH=/opt/llvm/bin/llvm-symbolizer\" \
          --test_output=errors \
          --test_tag_filters=\"-benchmark,-noasan\" \
          ${BAZEL_EXTRA_ARGS:-}"
    done
  done
done