Rediscover Go settings only when Go work needs them

publish_test.go

@@ -18,6 +18,44 @@ import (
 
 const releaseNote = "# Sample App v1.2.3\n\nA source release.\n\nUpgrade notes stay intact.\n"
 
+func TestCandidateOperationsDiscoverGoOnlyWhenLaterWorkNeedsIt(t *testing.T) {
+	gitPath := mustLookPath(t, "git")
+	gitOnly := t.TempDir()
+	if err := os.Symlink(gitPath, filepath.Join(gitOnly, "git")); err != nil {
+		t.Fatal(err)
+	}
+	for _, operation := range []string{"check", "publish"} {
+		for _, withBuild := range []bool{false, true} {
+			t.Run(fmt.Sprintf("%s/build=%t", operation, withBuild), func(t *testing.T) {
+				repo := newPublishFixture(t)
+				request := releasekit.ReleaseRequest{
+					RepositoryDir: repo.work, Product: "Sample App", Version: "v1.2.3",
+					AdditionalChecks: func(context.Context, releasekit.Candidate) error {
+						t.Setenv("PATH", gitOnly)
+						return nil
+					},
+				}
+				if withBuild {
+					request.Build = &releasekit.BuildSpec{MainPackage: ".", BinaryName: "fixture", Targets: []releasekit.Target{{OS: "linux", Arch: "amd64"}}}
+				}
+				var err error
+				if operation == "check" {
+					_, err = releasekit.Check(context.Background(), request)
+				} else {
+					_, err = releasekit.Publish(context.Background(), request)
+				}
+				if withBuild {
+					if !errors.Is(err, exec.ErrNotFound) {
+						t.Fatalf("later build did not rediscover changed Go inputs: %v", err)
+					}
+				} else if err != nil {
+					t.Fatalf("finished Go work added a discovery gate: %v", err)
+				}
+			})
+		}
+	}
+}
+
 func TestPublishPushesOnlyTheCapturedAnnotatedTag(t *testing.T) {
 	repo := newPublishFixture(t)
 	wrapper := installGitWrapper(t, repo, "pass")