Add checkout composite action

2026-09-21 22:34:54 -07:00
commit fab0c4d45e
2 changed files with 85 additions and 0 deletions
@@ -0,0 +1,20 @@
+# actions
+
+Shared Gitea Actions for Coffey Labs and INBUXA workflows. The instance sets
+`DEFAULT_ACTIONS_URL = self`, so `uses: coffey-labs/actions/<name>@<sha>`
+resolves here and nothing is fetched from GitHub implicitly.
+
+Pin every use by full commit SHA.
+
+## checkout
+
+```yaml
+- uses: coffey-labs/actions/checkout@<sha>
+  with:
+    fetch-depth: 0   # optional; default 1. 0 = all history and tags
+    tags: true       # optional; tags with a shallow fetch
+```
+
+Works in any job image with a POSIX shell. Installs git with apk or apt-get
+if the image has none, and clones from the runner's internal Gitea address
+(`CI_SERVER_INTERNAL`) so CI traffic never crosses Cloudflare.
@@ -0,0 +1,65 @@
+name: checkout
+description: >
+  Check out the triggering commit into the workspace, from Gitea's internal
+  address, in any job image. Unlike actions/checkout it needs no node in the
+  job container -- only a POSIX shell -- and installs git itself when the image
+  lacks it (php, python-slim, docker:cli, shellcheck-alpine).
+
+inputs:
+  fetch-depth:
+    description: Commits to fetch. 0 fetches all history and tags.
+    default: "1"
+  tags:
+    description: Also fetch tags when fetch-depth is not 0.
+    default: "false"
+
+runs:
+  using: composite
+  steps:
+    - shell: sh
+      env:
+        CO_TOKEN: ${{ github.token }}
+        CO_DEPTH: ${{ inputs.fetch-depth }}
+        CO_TAGS: ${{ inputs.tags }}
+      run: |
+        set -eu
+        if ! command -v git >/dev/null 2>&1; then
+          if command -v apk >/dev/null 2>&1; then
+            apk add --no-cache -q git
+          elif command -v apt-get >/dev/null 2>&1; then
+            apt-get -qq update >/dev/null
+            DEBIAN_FRONTEND=noninteractive apt-get -qq install -y --no-install-recommends git ca-certificates >/dev/null
+          else
+            echo "checkout: no git and no apk/apt-get in this image" >&2; exit 1
+          fi
+        fi
+
+        base="${CI_SERVER_INTERNAL:-$GITHUB_SERVER_URL}"
+        # The token rides in a header, never in the remote URL, so it cannot
+        # end up in .git/config or a log line.
+        auth="Authorization: Basic $(printf 'x-access-token:%s' "$CO_TOKEN" | base64 | tr -d '\n')"
+
+        cd "$GITHUB_WORKSPACE"
+        git init -q .
+        git config --global --add safe.directory "$GITHUB_WORKSPACE"
+        git remote add origin "$base/$GITHUB_REPOSITORY.git" 2>/dev/null \
+          || git remote set-url origin "$base/$GITHUB_REPOSITORY.git"
+
+        if [ "$CO_DEPTH" = 0 ]; then
+          git -c http.extraHeader="$auth" fetch -q --tags --prune origin \
+            '+refs/heads/*:refs/remotes/origin/*' "+$GITHUB_REF:refs/remotes/ci/ref"
+        else
+          tagopt=--no-tags; [ "$CO_TAGS" = true ] && tagopt=--tags
+          git -c http.extraHeader="$auth" fetch -q $tagopt --depth="$CO_DEPTH" origin \
+            "+$GITHUB_REF:refs/remotes/ci/ref"
+        fi
+
+        # GITHUB_SHA is what the run is for; the ref may have moved on since.
+        if git cat-file -e "$GITHUB_SHA^{commit}" 2>/dev/null; then
+          git checkout -q --detach "$GITHUB_SHA"
+        else
+          git -c http.extraHeader="$auth" fetch -q --depth="${CO_DEPTH:-1}" origin "$GITHUB_SHA" \
+            && git checkout -q --detach "$GITHUB_SHA" \
+            || { echo "checkout: $GITHUB_SHA is no longer reachable from $GITHUB_REF" >&2; exit 1; }
+        fi
+        echo "checked out $(git rev-parse --short HEAD) ($GITHUB_REF)"