feature-flag-checks.yml

# This check enforces merge restrictions on feature flag changes.
#
# To work properly:
# - Its jobs should be listed as a required status checks on each listed branch
# - Each listed branch should be configured to require merge queue
#
# If the directory containing feature flag configs changes, the path filtering
# step will need to be updated.
name: Feature flag checks

on:
  pull_request:
    branches: ["master"]
  # Required for merge queue to work: https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-a-merge-queue#triggering-merge-group-checks-with-github-actions
  # Merge queue is used so that this check runs immediately before merge.
  merge_group:
    branches: ["master"]

permissions:
  contents: read
  packages: read

jobs:
  enforce_feature_flag_merge_restrictions:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Detect changes to prod feature flag files
        uses: dorny/paths-filter@v3
        id: changes
        with:
          filters: |
            prod_flags:
              - 'deploy/featureflags/prod*'

      - name: Restrict prod feature flag changes to allowed hours
        if: steps.changes.outputs.prod_flags == 'true'
        run: |
          # Check if the current time is between 8 AM and 5 PM California time
          # on Monday, Tuesday, Wednesday, or Thursday.
          set -e
          export TZ="America/Los_Angeles"
          CURRENT_HOUR=$(date +"%-H")
          CURRENT_DAY=$(date -d "$DATE" +"%u") # 1 for Monday, 7 for Sunday

          if [[ "$CURRENT_DAY" -ge 1 && "$CURRENT_DAY" -le 4 ]]; then
            if [[ "$CURRENT_HOUR" -ge 8 && "$CURRENT_HOUR" -lt 17 ]]; then
              echo "Current time is within the allowed window for prod flag changes."
              exit 0
            fi
          fi
          echo "Error: Prod flag changes are only allowed between 8 AM and 5 PM California time on Monday-Thursday."
          exit 1