infra-git-hooks/pre-commit

#!/usr/bin/env bash
set -o errexit
set -o pipefail

# Updates generated configs if source configs have been modified.

generated_file() {
  echo "${1}" | sed "s:services/\(cr-buildbucket.*\.cfg\):services/generated/\1:"
}

# Assume directory layout as created by infra manifest, and CWD is inside a
# config dir, like fuchsia-infra/config.
TOOLS_DIR="../../fuchsia-infra/prebuilt/tools"
FLATTEN_TOOL="${TOOLS_DIR}/flatten_buildbucket_cfg/flatten_buildbucket_cfg"
if [[ ! -f "${FLATTEN_TOOL}" ]]; then
  echo "Expected the following path to be a regular file, but it's not: ${FLATTEN_TOOL}"
  exit 1
fi

VPYTHON="${TOOLS_DIR}/vpython"
if [[ ! -x "${VPYTHON}" ]]; then
  echo "Expected the following path to be an executable file, but it's not: ${VPYTHON}"
  exit 1
fi

# STATUS_FILES is an array where each element is:
# "STATUS FILE_PATH", where STATUS is one of the args to --diff-filter.
# https://git-scm.com/docs/git-diff#git-diff---diff-filterACDMRTUXB82308203
mapfile -t STATUS_FILES < <(git diff --cached --name-status --diff-filter=AMDR)

for STATUS_FILE in "${STATUS_FILES[@]}"; do
  # Split "STATUS FILE_PATH" into an array of >= 2 elements.
  read -r -a STATUS_FILE_ARR <<< ${STATUS_FILE}
  STATUS=${STATUS_FILE_ARR[0]}
  FILE=${STATUS_FILE_ARR[1]}
  if [[ "${FILE}" == services/cr-buildbucket*.cfg ]]; then
    GENERATED_FILE=$(generated_file ${FILE})
    if [[ "${STATUS}" == D && -e "${GENERATED_FILE}" ]]; then
      rm "${GENERATED_FILE}"
      git add "${GENERATED_FILE}"
    elif [[ "${STATUS}" == R* ]]; then
      [[ -e "${GENERATED_FILE}" ]] && git rm "${GENERATED_FILE}"
      # If it's a rename, STATUS_FILE_ARR should have a 3rd element:
      # the new name of the file.
      # Proceed as if we're adding the new name of the file.
      FILE=${STATUS_FILE_ARR[2]}
      GENERATED_FILE=$(generated_file ${FILE})
      STATUS="A"
    fi
    if [[ "${STATUS}" =~ [AM] ]]; then
      mkdir -p $(dirname "${GENERATED_FILE}")
      "${VPYTHON}" "${FLATTEN_TOOL}" "${FILE}" > "${GENERATED_FILE}"
      git add "${GENERATED_FILE}"
    fi
  fi
done