name: "Releasing PR"

on:
  pull_request:
    types: [closed]
    # No paths filter. A `paths-ignore: docs/**/*` used to live here as an
    # optimization, but the promote PR now carries docs/changelogs/vX.Y.Z.md —
    # and `Prepare stable branch` explicitly tolerates producing no tag-string
    # changes ("digests already stable"). That combination can yield a docs-only
    # promote PR, which the filter would drop: no finalize run, so no tag, no
    # release, and no error anywhere. Filtering is left entirely to the `if:`
    # gate below (merged + `release` label + release-bot author), which is what
    # actually decides whether this workflow should do anything. The cost is a
    # skipped job on unrelated closed PRs.

# Cancel in‑flight runs for the same PR when a new push arrives.
concurrency:
  group: pr-${{ github.workflow }}-${{ github.event.pull_request.number }}
  cancel-in-progress: true

# Top-level token defaults to read-only. A job-level block replaces this one
# rather than adding to it, so each job restates every scope it needs.
permissions:
  contents: read

jobs:
  finalize:
    name: Finalize Release
    # Runs skopeo + helm against GHCR (the promotion's registry side effects),
    # so it needs an ephemeral VM runner with those tools, not the self-hosted
    # pool.
    runs-on: [oracle-vm-4cpu-16gb-x86-64]
    permissions:
      contents: write
      packages: write

    # Finalize now both cuts the write-once tags AND performs the promotion's
    # registry side effects (retag rc->stable, move :latest, publish the stable
    # chart), so restrict who can trigger it: the PR must be merged, carry the
    # `release` label, AND be authored by the release bot (promote-rc.yaml opens
    # it as cozystack-ci[bot]). Merge rights already gate this; asserting the
    # author additionally closes the "name a branch release-X.Y.Z, get the label
    # applied, merge it" hole.
    if: |
      github.event.pull_request.merged == true &&
      contains(github.event.pull_request.labels.*.name, 'release') &&
      github.event.pull_request.user.login == 'cozystack-ci[bot]'

    env:
      # The registry promotion writes to: component images and the cozy-installer
      # chart. GHCR — the release registry tags.yaml builds rc images into — NOT
      # the OCIR CI registry. Must match hack/promote-retag.sh's default.
      REGISTRY: ghcr.io/cozystack/cozystack

    steps:
      - name: Generate GitHub App token
        id: app-token
        uses: actions/create-github-app-token@d72941d797fd3113feb6b93fd0dec494b13a2547 # v1
        with:
          app-id: ${{ secrets.COZYSTACK_CI_APP_ID }}
          private-key: ${{ secrets.COZYSTACK_CI_PRIVATE_KEY }}
          owner: cozystack

      # Extract tag from branch name  (branch = release-X.Y.Z*)
      - name: Extract tag from branch name
        id: get_tag
        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
        with:
          script: |
            const branch = context.payload.pull_request.head.ref;
            const m = branch.match(/^release-(\d+\.\d+\.\d+(?:[-\w\.]+)?)$/);
            if (!m) {
              core.setFailed(`Branch '${branch}' does not match 'release-X.Y.Z[-suffix]'`);
              return;
            }
            const tag = `v${m[1]}`;
            core.setOutput('tag', tag);
            console.log(`✅ Tag to publish: ${tag}`);

      # Checkout repo & create / push annotated tag
      - name: Checkout repo
        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
        with:
          fetch-depth: 0
          # Do NOT persist GITHUB_TOKEN as http.extraheader. Every tag/branch push
          # below re-injects the app token via `git remote set-url`, but a persisted
          # extraheader silently wins over the URL credential — so those pushes
          # would authenticate as GITHUB_TOKEN, and a GITHUB_TOKEN push creates no
          # workflow run (GitHub anti-recursion). That is exactly why v1.6.0's
          # stable tag triggered no tags.yaml run (the generate-changelog and
          # update-website-docs backstops never fired). With this false, the set-url
          # app token authenticates, matching how promote-rc.yaml already pushes.
          persist-credentials: false

      # Create the release tag at the merge commit — write-once.
      #
      # The tag is attached to the PR merge commit, which did not exist before
      # this release PR opened, so there is never a prior SHA to overwrite: a
      # force is impossible by construction. The guard makes that explicit and
      # makes re-runs idempotent. A pre-existing tag at a different commit means
      # something pushed the tag out-of-band — fail loudly rather than move it.
      - name: Create tag on merge commit (write-once)
        env:
          APP_TOKEN: ${{ steps.app-token.outputs.token }}
          TAG: ${{ steps.get_tag.outputs.tag }}
          SHA: ${{ github.sha }}
        run: |
          git config user.name  "cozystack-ci[bot]"
          git config user.email "274107086+cozystack-ci[bot]@users.noreply.github.com"
          git remote set-url origin https://x-access-token:${APP_TOKEN}@github.com/${GITHUB_REPOSITORY}
          EXISTING="$(git ls-remote --tags origin "refs/tags/${TAG}" | awk '{print $1}')"
          if [ -z "$EXISTING" ]; then
            git tag "${TAG}" "${SHA}"
            git push origin "refs/tags/${TAG}"
            echo "✅ Created ${TAG} at ${SHA}."
          elif [ "$EXISTING" = "${SHA}" ]; then
            echo "✅ ${TAG} already at ${SHA}; nothing to do."
          else
            echo "::error::${TAG} already exists at ${EXISTING}; refusing to force-move it to ${SHA} (tags are write-once)."
            exit 1
          fi

      # Tag the api/apps/v1alpha1 submodule for pkg.go.dev — stable releases only.
      #
      # Moved here from tags.yaml: under the promote flow the stable draft already
      # exists when the stable tag is pushed, so tags.yaml's prepare-release body
      # (which used to cut this) is skipped and the Go-module tag was never
      # created for a promoted stable. Finalize is where the stable tag is born,
      # so it is where the matching submodule tag must be cut, at the same commit.
      # Write-once: api/apps/v1alpha1/* tags feed the Go module proxy and
      # pkg.go.dev, where a moved tag poisons caches irreversibly — create when
      # absent, no-op if it already points here, fail loudly if it points
      # elsewhere. Skipped for a prerelease tag (an rc/beta/alpha Go-module tag
      # would permanently pollute the proxy — #2677 goal 3); rc promotions never
      # open a release PR so never reach finalize, but the guard is kept explicit.
      - name: Tag API submodule (write-once)
        if: ${{ !contains(steps.get_tag.outputs.tag, '-') }}
        env:
          APP_TOKEN: ${{ steps.app-token.outputs.token }}
          VTAG: ${{ steps.get_tag.outputs.tag }}
          SHA: ${{ github.sha }}
        run: |
          SUBTAG="api/apps/v1alpha1/${VTAG}"
          git config user.name  "cozystack-ci[bot]"
          git config user.email "274107086+cozystack-ci[bot]@users.noreply.github.com"
          git remote set-url origin https://x-access-token:${APP_TOKEN}@github.com/${GITHUB_REPOSITORY}
          # The submodule tag points at the same commit as the stable tag created
          # above — github.sha, the merge commit. Resolve from SHA directly (not
          # from the vX.Y.Z tag) so an idempotent re-run, where the stable tag
          # already existed and no local tag was created, still finds the target.
          EXISTING="$(git ls-remote --tags origin "refs/tags/${SUBTAG}" | awk '{print $1}')"
          if [ -z "$EXISTING" ]; then
            git tag "${SUBTAG}" "${SHA}"
            git push origin "refs/tags/${SUBTAG}"
            echo "✅ Created ${SUBTAG} at ${SHA}."
          elif [ "$EXISTING" = "${SHA}" ]; then
            echo "✅ ${SUBTAG} already at ${SHA}; nothing to do."
          else
            echo "::error::${SUBTAG} already exists at ${EXISTING}; refusing to force-move it to ${SHA} (tags are write-once)."
            exit 1
          fi

      # Ensure maintenance branch release-X.Y
      - name: Ensure maintenance branch release-X.Y
        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
            const tag = '${{ steps.get_tag.outputs.tag }}';  // e.g. v0.1.3 or v0.1.3-rc3
            const match = tag.match(/^v(\d+)\.(\d+)\.\d+(?:[-\w\.]+)?$/);
            if (!match) {
              core.setFailed(`❌ tag '${tag}' must match 'vX.Y.Z' or 'vX.Y.Z-suffix'`);
              return;
            }
            const line = `${match[1]}.${match[2]}`;
            const branch = `release-${line}`;

            // Get main branch commit for the tag
            const ref = await github.rest.git.getRef({
              owner: context.repo.owner,
              repo:  context.repo.repo,
              ref:   `tags/${tag}`
            });

            const commitSha = ref.data.object.sha;

            try {
              await github.rest.repos.getBranch({
                owner: context.repo.owner,
                repo: context.repo.repo,
                branch
              });
           
              // Fast-forward only — the maintenance branch is never rewound.
              // force:false makes GitHub reject (422) a non-fast-forward update;
              // we warn and leave the branch for a maintainer to resolve rather
              // than clobber history.
              try {
                await github.rest.git.updateRef({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  ref: `heads/${branch}`,
                  sha: commitSha,
                  force: false
                });
                console.log(`✅ Fast-forwarded '${branch}' to ${commitSha}`);
              } catch (ffErr) {
                // Only a non-fast-forward rejection (422) is the expected,
                // recoverable case. Auth/API/malformed-ref errors must not be
                // swallowed — they'd silently leave the maintenance branch stale.
                if (ffErr.status === 422) {
                  console.log(`::warning::Could not fast-forward '${branch}' to ${commitSha} (not a descendant); leaving as-is — resolve manually. (${ffErr.message})`);
                } else {
                  core.setFailed(`Unexpected error updating '${branch}': ${ffErr.message}`);
                  throw ffErr;
                }
              }
            } catch (err) {
              if (err.status === 404) {
                await github.rest.git.createRef({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  ref: `refs/heads/${branch}`,
                  sha: commitSha
                });
                console.log(`✅ Created branch '${branch}' at ${commitSha}`);
              } else {
                console.error('Unexpected error --', err);
                core.setFailed(`Unexpected error creating/updating branch: ${err.message}`);
                throw err;
              }
            }

      # Publish draft release and ensure correct latest flag
      - name: Publish draft release
        id: publish
        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
            const tag = '${{ steps.get_tag.outputs.tag }}';
            const m = tag.match(/^v(\d+\.\d+\.\d+)(-(?:alpha|beta|rc)\.\d+)?$/);
            if (!m) {
              core.setFailed(`❌ tag '${tag}' must match 'vX.Y.Z' or 'vX.Y.Z-(alpha|beta|rc).N'`);
              return;
            }
            const isRc = Boolean(m[2]);

            // Parse semver string to comparable numbers
            function parseSemver(v) {
              const match = v.replace(/^v/, '').match(/^(\d+)\.(\d+)\.(\d+)/);
              if (!match) return null;
              return {
                major: parseInt(match[1]),
                minor: parseInt(match[2]),
                patch: parseInt(match[3])
              };
            }

            // Compare two semver objects
            function compareSemver(a, b) {
              if (a.major !== b.major) return a.major - b.major;
              if (a.minor !== b.minor) return a.minor - b.minor;
              return a.patch - b.patch;
            }

            const currentSemver = parseSemver(tag);

            // Get all releases
            const releases = await github.rest.repos.listReleases({
              owner: context.repo.owner,
              repo: context.repo.repo,
              per_page: 100
            });

            // Find draft release to publish.
            //
            // Normally the draft was created by tags.yaml with tag_name === tag.
            // But if the git tag was deleted and re-created between draft creation
            // and merge (e.g. the release branch was force-updated), GitHub orphans
            // the draft: tag_name becomes "untagged-<hash>" while `name` is kept.
            // Fall back to matching by `name` and repair the draft's tag_name
            // before publishing — otherwise the published release would not point
            // at the real git tag.
            let draft = releases.data.find(r => r.draft && r.tag_name === tag);
            if (!draft) {
              const orphan = releases.data.find(r =>
                r.draft && r.name === tag && /^untagged-/.test(r.tag_name)
              );
              if (!orphan) throw new Error(`Draft release for ${tag} not found`);
              console.log(`🔧 Repairing orphaned draft ${orphan.id}: tag_name '${orphan.tag_name}' -> '${tag}'`);
              const repaired = await github.rest.repos.updateRelease({
                owner: context.repo.owner,
                repo: context.repo.repo,
                release_id: orphan.id,
                tag_name: tag
              });
              draft = repaired.data;
            }

            // Find max semver among published releases (excluding current draft)
            const publishedReleases = releases.data
              .filter(r => !r.draft && !r.prerelease)
              .filter(r => /^v\d+\.\d+\.\d+$/.test(r.tag_name))
              .map(r => ({ id: r.id, tag: r.tag_name, semver: parseSemver(r.tag_name) }))
              .filter(r => r.semver !== null);

            let maxRelease = null;
            for (const rel of publishedReleases) {
              if (!maxRelease || compareSemver(rel.semver, maxRelease.semver) > 0) {
                maxRelease = rel;
              }
            }

            // Determine if this release should be latest
            const isOutdated = maxRelease && compareSemver(currentSemver, maxRelease.semver) < 0;
            const makeLatest = (isRc || isOutdated) ? 'false' : 'true';

            // The image retag step below reuses this exact decision to gate
            // whether :latest moves — the release's `latest` and the images'
            // :latest must agree (a patch on an old line moves neither).
            core.setOutput('make_latest', makeLatest);

            if (isRc) {
              console.log(`🏷️  ${tag} is a prerelease, make_latest: false`);
            } else if (isOutdated) {
              console.log(`🏷️  ${tag} < ${maxRelease.tag} (max semver), make_latest: false`);
            } else {
              console.log(`🏷️  ${tag} is the highest version, make_latest: true`);
            }

            // Release body comes from the changelog that merged with THIS PR
            // (promote-rc.yaml commits it onto the release-X.Y.Z branch), read
            // from the merge commit already checked out here.
            //
            // Deliberately not left to update-releasenotes.yaml: that workflow
            // triggers on pushes to main touching docs/changelogs/v*.md, and it
            // only watches main. Since the rc freeze every promote PR targets
            // release-X.Y, so no such push exists at promote time and it would
            // sync no release at all — that used to be the patch-release corner
            // case and is now every release. Back when the promote PR did merge
            // into main it was worse than useless: it raced this job on that very
            // push, and if it won it found no published release yet, skipped, and
            // never fired again, leaving the release body permanently empty.
            // Reading the file here is both race-free and branch-agnostic;
            // update-releasenotes.yaml remains for later maintainer edits and
            // manual re-syncs.
            const fs = require('fs');
            const changelogPath = `docs/changelogs/${tag}.md`;
            let body;
            if (fs.existsSync(changelogPath)) {
              const raw = fs.readFileSync(changelogPath, 'utf8');
              // Last line of defence before the body becomes public and
              // immutable-by-convention. promote-rc.yaml validates the changelog
              // structurally, but it can also arrive by hand-commit, and an
              // empty or whitespace-only file here would blank the release notes
              // more thoroughly than publishing the draft's body would.
              if (raw.trim().length === 0) {
                console.log(`::warning::${changelogPath} is empty or whitespace-only — refusing to use it as the release body for ${tag}. Publishing with the draft's existing body instead.`);
              } else {
                body = raw;
                console.log(`📝 Release body from ${changelogPath} (${body.length} bytes)`);
              }
            } else {
              console.log(`::warning::${changelogPath} not found in the merge commit — publishing ${tag} with the draft's existing body. Add the changelog and re-run 'Update Release Notes' to backfill it.`);
            }

            // Publish the release
            await github.rest.repos.updateRelease({
              owner: context.repo.owner,
              repo: context.repo.repo,
              release_id: draft.id,
              draft: false,
              prerelease: isRc,
              make_latest: makeLatest,
              ...(body ? { body } : {})
            });
            console.log(`🚀 Published release ${tag}`);

            // If this is a backport/outdated release, ensure the correct release is marked as latest
            if (isOutdated && maxRelease) {
              console.log(`🔧 Ensuring ${maxRelease.tag} remains the latest release...`);
              await github.rest.repos.updateRelease({
                owner: context.repo.owner,
                repo: context.repo.repo,
                release_id: maxRelease.id,
                make_latest: 'true'
              });
              console.log(`✅ Restored ${maxRelease.tag} as latest release`);
            }

      # ── Transactional promotion: the registry side effects run HERE, after the
      #    stable tag is cut and the release is published — i.e. after the promote
      #    PR's e2e passed and the PR merged. promote-rc.yaml did none of this at
      #    dispatch time, so an abandoned promotion left no stable-named bytes.
      #
      #    The checked-out merge commit is the promoted stable tree: the rc's
      #    digests with the tag string rewritten to stable. skopeo retags those
      #    digests to the stable image tag; helm packages+pushes the stable chart.
      - name: Set up toolchain (skopeo, yq, helm)
        if: ${{ !contains(steps.get_tag.outputs.tag, '-') }}
        run: |
          command -v yq >/dev/null \
            || { sudo curl -sSL -o /usr/local/bin/yq https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64 && sudo chmod +x /usr/local/bin/yq; }
          command -v skopeo >/dev/null \
            || { sudo apt-get update -qq && sudo apt-get install -y -qq skopeo; }
          command -v helm >/dev/null \
            || curl -fsSL https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash

      - name: Login to registry (GHCR)
        if: ${{ !contains(steps.get_tag.outputs.tag, '-') }}
        env:
          GHCR_USER:  ${{ github.actor }}
          GHCR_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          echo "$GHCR_TOKEN" | skopeo login "${REGISTRY%%/*}" -u "$GHCR_USER" --password-stdin
          echo "$GHCR_TOKEN" | helm registry login "${REGISTRY%%/*}" -u "$GHCR_USER" --password-stdin

      # Retag every rc image/digest to the stable tag. No rebuild — bit-for-bit
      # the e2e-tested rc. :latest moves only when this stable is the newest
      # published version, gated by the SAME make_latest decision the release got.
      - name: Retag rc images to stable
        if: ${{ !contains(steps.get_tag.outputs.tag, '-') }}
        env:
          STABLE_TAG:  ${{ steps.get_tag.outputs.tag }}
          MOVE_LATEST: ${{ steps.publish.outputs.make_latest == 'true' && '1' || '0' }}
        run: ./hack/promote-retag.sh "${STABLE_TAG}"

      # Publish the stable cozy-installer OCI chart — the documented install path
      # (`helm upgrade --install cozystack oci://…/cozy-installer --version X.Y.Z`).
      # The retag above covers component images + the cozystack-packages artifact,
      # but the chart is a separate OCI artifact referenced in no values.yaml, so
      # the stable install 404s (manifest unknown) unless it is published here.
      # No rebuild: the chart is packaged from the merged stable tree, which pins
      # the retagged images + artifact by digest; only the chart's version and
      # its platformVersion default are stamped.
      - name: Publish stable cozy-installer chart
        if: ${{ !contains(steps.get_tag.outputs.tag, '-') }}
        env:
          TAG:         ${{ steps.get_tag.outputs.tag }}
          MAKE_LATEST: ${{ steps.publish.outputs.make_latest }}
        run: |
          set -eu
          STABLE_VERSION="${TAG#v}"
          # Bake the correct platform version into the chart's DEFAULT values so
          # the primary `helm --install --version X.Y.Z` path reports the stable
          # version in telemetry — the operator image itself still carries the rc
          # version baked at build time, and this env override is what corrects
          # it. Done on the working tree only (never committed): committing it
          # would leak platformVersion=vX.Y.Z onto main/the release line when the
          # promote PR merges, mis-stamping the next rc built from that branch.
          export STABLE_VERSION
          yq -i '.cozystackOperator.platformVersion = "v" + strenv(STABLE_VERSION)' \
            packages/core/installer/values.yaml
          PKG="$(helm package packages/core/installer \
            --version "${STABLE_VERSION}" --app-version "${STABLE_VERSION}" | awk '{print $NF}')"
          helm push "$PKG" "oci://${REGISTRY}"
          rm -f "$PKG"
          # cozy-installer:latest tracks the newest stable, matching the image
          # :latest and the release's `latest` flag — never moved by a patch on
          # an older line.
          if [ "${MAKE_LATEST}" = "true" ]; then
            skopeo copy --multi-arch all \
              "docker://${REGISTRY}/cozy-installer:${STABLE_VERSION}" \
              "docker://${REGISTRY}/cozy-installer:latest"
          fi