verifyFreezePeriod.yml

# This workflow will check if the project is currently in a Code-Freeze-Period

name: Verify Code Freeze Period

on:
  workflow_call
  
permissions:
  issues: read

jobs:
  verify-freeze-period:
    runs-on: ubuntu-latest
    steps:
    - name: Checking for code-freeze period
      uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
      with:
        script: |
          // See 
          // - https://octokit.github.io/rest.js/v21/#issues-list-milestones
          // - https://docs.github.com/en/rest/issues/milestones?apiVersion=2022-11-28#list-milestones
          // About pagination, see https://github.com/octokit/octokit.js#pagination
          const responseIterator = github.paginate.iterator(github.rest.issues.listMilestones, {
            ...context.repo,
            state: 'open', sort: 'due_on', direction: 'desc',
            per_page: 6, // the six milestones of the current release are usually sufficient
          })
          const now = new Date()
          for await (const response of responseIterator) { // iterate through each response
            for (const milestone of response.data) {
              console.log('Checking milestone ' + milestone.title)
              const dueDate = new Date(milestone.due_on)
              if (milestone.title.includes('RC') && isInFreezePeriodOf(dueDate, now)) {
                core.setFailed('Active freeze period for ' + milestone.description)
                return;
              } else if (dueDate < now) {
                // As milestones are sorted by descending due-dates and this one's is in the past, following ones won't match either.
                return;
              }
            }
          }
          
          function isInFreezePeriodOf(referenceDate, nowDate) {
            // A freeze period starts at the beginning of the third day before the milestone/RC
            // Two days for stabilization and one for sign-off before the promotion happens at the date.
            const freezePeriodStartOffset = 3
            const endDate = new Date(referenceDate)
            endDate.setUTCHours(24, 0, 0) // start of next day
            const startDate = new Date(referenceDate)
            startDate.setDate(startDate.getDate() - freezePeriodStartOffset); // handles month and year under-flow
            startDate.setUTCHours(0, 0, 0) // start of the day
            return startDate <= nowDate  && nowDate < endDate
          }