fix(agent): give compose.override.yaml the owner of the stack (#24) (#26)

internal/agent/updater/compose_test.go

@@ -69,6 +69,7 @@ func TestComposeExecutor(t *testing.T) {
 	root, _ := filepath.EvalSymlinks(t.TempDir())
 	stack := filepath.Join(root, "slusk")
 	require.NoError(t, os.MkdirAll(stack, 0o755))
+	composeFile := stackFile(t, stack)
 	job := protocol.JobStart{Kind: protocol.KindCompose, ComposeProject: "slusk", ComposeService: "web", Ref: "gitea.shcizo.se/shcizo/slusk:1.4"}
 	pinned := job.Ref + "@" + d
 
@@ -107,6 +108,19 @@ func TestComposeExecutor(t *testing.T) {
 		_, doc := readOverride(t, stack)
 		assert.Equal(t, pinned, serviceImage(doc, "web"))
 		assert.Contains(t, out.String(), "resolved "+pinned)
+		assert.NotContains(t, out.String(), "warning")
+	})
+	t.Run("an unreadable owner is a warning and the job still succeeds", func(t *testing.T) {
+		t.Cleanup(cleanOverride)
+		require.NoError(t, os.Rename(composeFile, composeFile+".bak"))
+		t.Cleanup(func() { os.Rename(composeFile+".bak", composeFile) })
+		var out strings.Builder
+		got, err := setup(fakeCompose{rw, []container.Summary{ct}}, &fakeDist{digest: d}, &recorder{}).Execute(context.Background(), job, &out)
+		require.NoError(t, err)
+		assert.Equal(t, pinned, got)
+		assert.Contains(t, out.String(), "warning: could not give the override the stack's owner: read owner: ")
+		_, doc := readOverride(t, stack)
+		assert.Equal(t, pinned, serviceImage(doc, "web"))
 	})
 	t.Run("a pinned ref is written verbatim and not resolved", func(t *testing.T) {
 		t.Cleanup(cleanOverride)