Answer stability round 1: 0 🔴, 3 🟡; fail when the latest release can't be read, build every platform's binaries when Go changes, and test main() and the Unreleased heading

.github/workflows/packages.yml

@@ -66,7 +66,8 @@ jobs:
           GH_TOKEN: ${{ github.token }}
           TAG: ${{ inputs.tag }}
         run: |
-          if [ "$(gh release view --repo "$GITHUB_REPOSITORY" --json tagName --jq .tagName)" = "$TAG" ]; then
+          latest="$(gh release view --repo "$GITHUB_REPOSITORY" --json tagName --jq .tagName)"
+          if [ "$latest" = "$TAG" ]; then
             echo "latest=true" >> "$GITHUB_OUTPUT"
           else
             echo "skip=--skip=homebrew,scoop,aur" >> "$GITHUB_OUTPUT"

.github/workflows/test.yml

@@ -32,7 +32,7 @@ jobs:
           else
             echo "code=true" >> "$GITHUB_OUTPUT"
           fi
-          if git diff --quiet "$base"...HEAD -- release-tooling Dockerfile .dockerignore LICENSE DATA-LICENSES.md .github/workflows/packages.yml .github/workflows/test.yml; then
+          if git diff --quiet "$base"...HEAD -- '*.go' go.mod go.sum release-tooling Dockerfile .dockerignore LICENSE DATA-LICENSES.md .github/workflows/packages.yml .github/workflows/test.yml; then
             echo "packaging=false" >> "$GITHUB_OUTPUT"
           else
             echo "packaging=true" >> "$GITHUB_OUTPUT"

README.md

@@ -1219,9 +1219,10 @@ docker build --build-arg GO_VERSION=1.22.12 --target portable . # lowest support
 GO_VERSION=1.22.12 docker compose run --rm test                 # the same tests, without the image build
 ```
 
-A change to `release-tooling/`, the `Dockerfile`, `.dockerignore`, the licence files or
-either workflow also builds the apt, dnf and apk repositories from snapshot packages,
-signs them with throwaway keys, and installs fejkdata from each:
+A change to Go code, `release-tooling/`, the `Dockerfile`, `.dockerignore`, the licence
+files or either workflow also builds the release binaries for every platform, the apt, dnf
+and apk repositories from their packages, signed with throwaway keys, and installs
+fejkdata from each:
 
 ```sh
 docker build -f release-tooling/package-repos.Dockerfile --target throwaway-keys --output /tmp/fejkdata-keys .

release-tooling/package-repos.Dockerfile

@@ -1,8 +1,4 @@
-# The apt, dnf and apk repositories GitHub Pages serves, signed, from the .deb, .rpm and
-# .apk files of the `packages` stage: a snapshot built from the source here, or a release's
-# when `--build-context packages=<dir>` replaces it. The checks target installs fejkdata
-# from each repository, and where EXPECTED_VERSION is set, checks it prints that tag; the
-# README's Development section shows the commands.
+# A release's packages replace the snapshot ones through `--build-context packages=<dir>`.
 ARG BASE_URL=https://larvit.github.io/fejkdata
 ARG EXPECTED_VERSION
 

release-tooling/publish_release_test.py

@@ -16,6 +16,19 @@ def not_found(path):
 	return urllib.error.HTTPError(path, 404, "Not Found", None, None)
 
 
+def forge(responses, created):
+	def request(path, data=None):
+		if data is not None:
+			created.append(data)
+			return {"html_url": "https://forge.example/release"}
+		response = responses.get(path)
+		if response is None:
+			raise not_found(path)
+		return response
+
+	return request
+
+
 class TagGuard(unittest.TestCase):
 	def setUp(self):
 		cwd = os.getcwd()
@@ -31,17 +44,7 @@ class TagGuard(unittest.TestCase):
 
 	def publish(self, responses):
 		created = []
-
-		def request(path, data=None):
-			if data is not None:
-				created.append(data)
-				return {"html_url": "https://forge.example/release"}
-			response = responses.get(path)
-			if response is None:
-				raise not_found(path)
-			return response
-
-		with mock.patch.object(publish_release, "request", request), \
+		with mock.patch.object(publish_release, "request", forge(responses, created)), \
 			redirect_stdout(io.StringIO()), redirect_stderr(io.StringIO()):
 			code, self.tag = publish_release.publish()
 		return code, created
@@ -70,6 +73,22 @@ class TagGuard(unittest.TestCase):
 		self.assertEqual(created, [{"body": "- A change.", "name": "v1.2.3", "tag_name": "v1.2.3", "target_commitish": SHA}])
 		self.assertEqual(self.tag, "v1.2.3")
 
+	def test_an_unreleased_heading_publishes_nothing(self):
+		with open("CHANGELOG.md", "w", encoding="utf-8") as f:
+			f.write("# Changelog\n\n## [Unreleased]\n\n- A change.\n")
+		code, created = self.publish({})
+		self.assertEqual((code, created, self.tag), (0, [], None))
+
+	def test_main_names_only_a_published_tag_to_ci(self):
+		for responses, output in (({}, "tag=v1.2.3\n"), ({"releases/tags/v1.2.3": {"html_url": "https://forge.example/release"}}, "")):
+			open("output", "w").close()
+			with mock.patch.dict(os.environ, {"GITHUB_OUTPUT": os.path.abspath("output")}), \
+				mock.patch.object(publish_release, "request", forge(responses, [])), \
+				redirect_stdout(io.StringIO()):
+				self.assertEqual(publish_release.main(), 0)
+			with open("output", encoding="utf-8") as f:
+				self.assertEqual(f.read(), output)
+
 	def test_a_published_release_publishes_nothing(self):
 		code, created = self.publish({"releases/tags/v1.2.3": {"html_url": "https://forge.example/release"}})
 		self.assertEqual((code, created, self.tag), (0, [], None))