Copy files to temp-dir for testing

build_files_updated_unittest.sh

@@ -2,22 +2,61 @@
 
 # This script verifies that BUILD files and cmake files are in sync with src/Makefile.am
 
-set -euo pipefail
+set -eo pipefail
 
-cp "BUILD" "BUILD.orginal"
-cp "cmake/extract_includes.bat.in" "cmake/extract_includes.bat.in.orginal"
-cp "cmake/libprotobuf-lite.cmake" "cmake/libprotobuf-lite.cmake.orginal"
-cp "cmake/libprotobuf.cmake" "cmake/libprotobuf.cmake.orginal"
-cp "cmake/libprotoc.cmake" "cmake/libprotoc.cmake.orginal"
-cp "cmake/tests.cmake" "cmake/tests.cmake.orginal"
+if [ "$(uname)" != "Linux" ]; then
+  echo "build_files_updated_unittest only supported on Linux. Skipping..."
+  exit 0
+fi
+
+# Keep in sync with files needed by update_file_lists.sh
+generated_files=(
+  "BUILD"
+  "cmake/extract_includes.bat.in"
+  "cmake/libprotobuf-lite.cmake"
+  "cmake/libprotobuf.cmake"
+  "cmake/libprotoc.cmake"
+  "cmake/tests.cmake"
+  "src/Makefile.am"
+)
 
-if [ "$(uname)" == "Linux" ]; then
-  ./update_file_lists.sh
+# If we're running in Bazel, use the Bazel-provided temp-dir.
+if [ -n "${TEST_TMPDIR}" ]; then
+  # Env-var TEST_TMPDIR is set, assume that this is Bazel.
+  # Bazel may have opinions whether we are allowed to delete TEST_TMPDIR.
+  test_root="${TEST_TMPDIR}/build_files_updated_unittest"
+  mkdir "${test_root}"
+else
+  # Seems like we're not executed by Bazel.
+  test_root=$(mktemp -d)
 fi
 
-diff "BUILD.orginal" "BUILD"
-diff "cmake/extract_includes.bat.in.orginal" "cmake/extract_includes.bat.in"
-diff "cmake/libprotobuf-lite.cmake.orginal" "cmake/libprotobuf-lite.cmake"
-diff "cmake/libprotobuf.cmake.orginal" "cmake/libprotobuf.cmake"
-diff "cmake/libprotoc.cmake.orginal" "cmake/libprotoc.cmake"
-diff "cmake/tests.cmake.orginal" "cmake/tests.cmake"
+# From now on, fail if there are any unbound variables.
+set -u
+
+# Remove artifacts after test is finished.
+function cleanup {
+  rm -rf "${test_root}"
+}
+trap cleanup EXIT
+
+# Create golden dir and add snapshot of current state.
+golden_dir="${test_root}/golden"
+mkdir -p "${golden_dir}/cmake" "${golden_dir}/src"
+for file in ${generated_files[@]}; do
+  cp "${file}" "${golden_dir}/${file}"
+done
+
+# Create test dir, copy current state into it, and execute update script.
+test_dir="${test_root}/test"
+cp -R "${golden_dir}" "${test_dir}"
+
+cp "update_file_lists.sh" "${test_dir}/update_file_lists.sh"
+chmod +x "${test_dir}/update_file_lists.sh"
+cd "${test_root}/test"
+bash "${test_dir}/update_file_lists.sh"
+
+# Test whether there are any differences
+for file in ${generated_files[@]}; do
+  diff "${golden_dir}/${file}" "${test_dir}/${file}"
+done