test(e2e): run the template's pipelines against a release

internal/e2e/gitlab/template_test.go

@@ -33,7 +33,8 @@ import (
 //  1. the hub: the template's files in one commit, as GitLab's import of a
 //     repository makes a project (no pipeline runs), in the group of hubs,
 //     with the instance runners off; the one change is the image line, the
-//     TODO(release) placeholder replaced with the image under test, in the
+//     template's pin (a release's digest, or the TODO(release) placeholder
+//     before the first release) replaced with the image under test, in the
 //     same NAME:TAG@sha256:<digest> form;
 //  2. `touchmark setup gitlab` from a clone of the hub, with the person's
 //     token (README "On GitLab", steps 2 to 4);
@@ -257,17 +258,19 @@ func templateFiles(tpl map[string][]byte, replace map[string]string) []conforman
 	return files
 }
 
-// placeholderImage is the template's image line before a release pins it.
-var placeholderImage = regexp.MustCompile(`(?m)^(\s*name: )ghcr\.io/bedrock-python/touchmark:[^@\s]+@sha256:0{64}$`)
+// templateImage is the template's touchmark image line: a release's,
+// pinned by digest, or before the first release the TODO(release)
+// placeholder, whose digest is all zeros.
+var templateImage = regexp.MustCompile(`(?m)^(\s*name: )ghcr\.io/bedrock-python/touchmark:[^@\s]+@sha256:[0-9a-f]{64}$`)
 
-// pinImage replaces the one placeholder image of the template's
+// pinImage replaces the one touchmark image of the template's
 // .gitlab-ci.yml with image, as a release's update does.
 func pinImage(t *testing.T, ci, image string) string {
 	t.Helper()
-	if n := len(placeholderImage.FindAllString(ci, -1)); n != 1 {
-		t.Fatalf("the template's .gitlab-ci.yml has %d placeholder image lines (name: ghcr.io/bedrock-python/touchmark:<tag>@sha256:0…), want 1", n)
+	if n := len(templateImage.FindAllString(ci, -1)); n != 1 {
+		t.Fatalf("the template's .gitlab-ci.yml has %d touchmark image lines (name: ghcr.io/bedrock-python/touchmark:<tag>@sha256:<digest>), want 1", n)
 	}
-	return placeholderImage.ReplaceAllString(ci, "${1}"+image)
+	return templateImage.ReplaceAllString(ci, "${1}"+image)
 }
 
 // describeHub sets id and writer in the template's hub.yml, as README step

internal/e2e/template_test.go

@@ -26,7 +26,8 @@ import (
 //
 //  1. the hub: the template's files in one commit on main, as a migration
 //     makes it (the commit skips CI), in the organisation of hubs; the one
-//     change is the image of the jobs, the TODO(release) placeholder
+//     change is the image of the jobs, the template's pin (a release's
+//     digest, or the TODO(release) placeholder before the first release)
 //     replaced with the image under test in the same NAME:TAG@sha256 form;
 //     the reader's and the writer's tokens as the Actions secrets
 //     TOUCHMARK_READ_TOKEN and TOUCHMARK_WRITE_TOKEN (README "On Gitea or
@@ -304,18 +305,19 @@ func templateFiles(tpl map[string][]byte, replace map[string]string) []conforman
 	return files
 }
 
-// placeholderImage is a job's image in the template before a release pins
-// it.
-var placeholderImage = regexp.MustCompile(`(?m)^(\s*image: )ghcr\.io/bedrock-python/touchmark:[^@\s]+@sha256:0{64}$`)
+// templateImage is a job's touchmark image in the template: a release's,
+// pinned by digest, or before the first release the TODO(release)
+// placeholder, whose digest is all zeros.
+var templateImage = regexp.MustCompile(`(?m)^(\s*image: )ghcr\.io/bedrock-python/touchmark:[^@\s]+@sha256:[0-9a-f]{64}$`)
 
-// pinImages replaces every placeholder image of a workflow with image, as
-// a release's update does; the workflow must have one per job.
+// pinImages replaces every touchmark image of a workflow with image, as a
+// release's update does; the workflow must have one per job.
 func pinImages(t *testing.T, name, workflow, image string) string {
 	t.Helper()
-	if len(placeholderImage.FindAllString(workflow, -1)) == 0 {
-		t.Fatalf("%s has no placeholder image (image: ghcr.io/bedrock-python/touchmark:<tag>@sha256:0…)", name)
+	if len(templateImage.FindAllString(workflow, -1)) == 0 {
+		t.Fatalf("%s has no touchmark image (image: ghcr.io/bedrock-python/touchmark:<tag>@sha256:<digest>)", name)
 	}
-	return placeholderImage.ReplaceAllString(workflow, "${1}"+image)
+	return templateImage.ReplaceAllString(workflow, "${1}"+image)
 }
 
 // describeHub sets id and writer in the template's hub.yml, as README step

scripts/e2e/template-lib.sh

@@ -97,9 +97,16 @@ tpl_image() {
 	tpl_pushed=localhost:$port/touchmark:0.0.0-e2e
 	docker tag "$image" "$tpl_pushed"
 	docker push -q "$tpl_pushed" >/dev/null || die "cannot push to the registry on localhost:$port"
-	digest=$(docker image inspect -f '{{range .RepoDigests}}{{println .}}{{end}}' "$tpl_pushed" |
-		sed -n "s|^localhost:$port/touchmark@\(sha256:[0-9a-f]\{64\}\)\$|\1|p" | head -n 1)
-	[ -n "$digest" ] || die "the pushed image has no digest of localhost:$port"
+	# The digest is the one the registry serves for the tag, not the one
+	# RepoDigests names: with the containerd image store, a multi-platform
+	# image pulled for one platform is pushed as that platform's manifest
+	# alone, while RepoDigests keeps the index's digest, which the registry
+	# then lacks (a runner that always pulls fails on it).
+	digest=$(docker exec "$tpl_registry" wget -S -q -O /dev/null \
+		--header 'Accept: application/vnd.oci.image.index.v1+json, application/vnd.oci.image.manifest.v1+json, application/vnd.docker.distribution.manifest.list.v2+json, application/vnd.docker.distribution.manifest.v2+json' \
+		"http://127.0.0.1:$port/v2/touchmark/manifests/0.0.0-e2e" 2>&1 |
+		sed -n 's/^ *[Dd]ocker-[Cc]ontent-[Dd]igest: *\(sha256:[0-9a-f]\{64\}\).*$/\1/p' | head -n 1)
+	[ -n "$digest" ] || die "the registry on localhost:$port serves no digest for $tpl_pushed"
 	tpl_image_ref=$tpl_pushed@$digest
 	log "touchmark image: $image, as $tpl_image_ref ($(docker run --rm --entrypoint touchmark "$tpl_image_ref" version 2>&1 | head -n 1))"
 }