sync-gitster-git-branches #29
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| name: sync-gitster-git-branches | |
| on: | |
| schedule: | |
| - cron: '17 6 * * *' | |
| workflow_dispatch: | |
| env: | |
| SOURCE_REPOSITORY: gitster/git | |
| TARGET_REPOSITORY: gitgitgadget/git | |
| # We want to limit queuing to a single workflow run i.e. if there is already | |
| # an active workflow run and a queued one, queue another one canceling the | |
| # already queued one. | |
| concurrency: | |
| group: ${{ github.workflow }} | |
| jobs: | |
| sync-gitster-git-branches: | |
| runs-on: ubuntu-latest | |
| steps: | |
| - name: check which refs need to be synchronized | |
| uses: actions/github-script@v6 | |
| id: check | |
| with: | |
| script: | | |
| const sleep = async (milliseconds) => { | |
| return new Promise(resolve => setTimeout(resolve, milliseconds)) | |
| } | |
| const getRefs = async (repository) => { | |
| let attemptCounter = 1 | |
| for (;;) { | |
| try { | |
| const [owner, repo] = repository.split('/') | |
| const { data } = await github.rest.git.listMatchingRefs({ | |
| owner, | |
| repo, | |
| // We want to match `maint-*` as well as `[a-z][a-z]/*` | |
| // sadly, this is not possible via GitHub's REST API, | |
| // hence we do it below via the `filter()` call. | |
| ref: 'heads/' | |
| }) | |
| return data | |
| .filter(e => e.ref.match(/^refs\/heads\/(maint-\d|[a-z][a-z]\/)/)) | |
| .sort((a, b) => a.ref.localeCompare(b.ref)) | |
| } catch (e) { | |
| if (e?.status !== 502) throw e | |
| } | |
| if (++attemptCounter > 10) throw new Error('Giving up listing refs after 10 attempts') | |
| const seconds = attemptCounter * attemptCounter + 15 * Math.random() | |
| core.info(`Encountered a Server Error; retrying in ${seconds} seconds`) | |
| await sleep(1000 * seconds) | |
| } | |
| } | |
| const sourceRefs = await getRefs(process.env.SOURCE_REPOSITORY) | |
| const targetRefs = await getRefs(process.env.TARGET_REPOSITORY) | |
| const refspecs = [] | |
| const toFetch = new Set() | |
| for (let i = 0, j = 0; i < sourceRefs.length || j < targetRefs.length; ) { | |
| const compare = i >= sourceRefs.length | |
| ? +1 | |
| : j >= targetRefs.length | |
| ? -1 | |
| : sourceRefs[i].ref.localeCompare(targetRefs[j].ref) | |
| if (compare > 0) { | |
| // no source ref => delete target ref | |
| refspecs.push(`:${targetRefs[j].ref}`) | |
| j++ | |
| } else if (compare < 0) { | |
| // no corresponding target ref yet => push source ref (new) | |
| const sha = sourceRefs[i].object.sha | |
| toFetch.add(sha) | |
| refspecs.push(`${sha}:${sourceRefs[i].ref}`) | |
| i++ | |
| } else { | |
| // the sourceRef's name matches the targetRef's | |
| if (sourceRefs[i].object.sha !== targetRefs[j].object.sha) { | |
| // target ref needs updating | |
| const sha = sourceRefs[i].object.sha | |
| toFetch.add(sha) | |
| refspecs.push(`+${sha}:${sourceRefs[i].ref}`) | |
| } | |
| i++ | |
| j++ | |
| } | |
| } | |
| core.setOutput('refspec', refspecs.join(' ')) | |
| targetRefs.forEach((e) => toFetch.delete(e.object.sha)) | |
| core.setOutput('to-fetch', [...toFetch].join(' ')) | |
| - name: obtain installation token | |
| if: steps.check.outputs.refspec != '' | |
| uses: tibdex/github-app-token@b62528385c34dbc9f38e5f4225ac829252d1ea92 | |
| id: token | |
| with: | |
| app_id: ${{ secrets.GITGITGADGET_GITHUB_APP_ID }} | |
| private_key: ${{ secrets.GITGITGADGET_GITHUB_APP_PRIVATE_KEY }} | |
| repository: ${{ env.TARGET_REPOSITORY }} | |
| - name: set authorization header | |
| if: steps.check.outputs.refspec != '' | |
| uses: actions/github-script@v6 | |
| id: auth | |
| with: | |
| script: | | |
| // Sadly, `git push` does not work with 'Authorization: Bearer <PAT>', therefore | |
| // we have to use the `Basic` variant | |
| const auth = Buffer.from('PAT:${{ steps.token.outputs.token }}').toString('base64') | |
| core.setSecret(auth) | |
| core.setOutput('header', `Authorization: Basic ${auth}`) | |
| - name: sync | |
| if: steps.check.outputs.refspec != '' | |
| shell: bash | |
| run: | | |
| set -ex | |
| git init --bare | |
| git remote add source "${{ github.server_url }}/$SOURCE_REPOSITORY" | |
| # pretend to be a partial clone | |
| git config remote.source.promisor true | |
| git config remote.source.partialCloneFilter blob:none | |
| # fetch some commits | |
| printf '%s' '${{ steps.check.outputs.to-fetch }}' | | |
| xargs -d ' ' -r git fetch --depth 10000 source | |
| rm -f .git/shallow | |
| # push the commits | |
| printf '%s' '${{ steps.check.outputs.refspec }}' | | |
| xargs -d ' ' -r git -c http.extraHeader='${{ steps.auth.outputs.header }}' \ | |
| push "${{ github.server_url }}/$TARGET_REPOSITORY" |