main,test: tweak cmdVersion

This comit tweak the new and very nice functionality of
cmdVersion in the following way:
- Rename to versionFromBuildInfo as it is no longer a "cmd*" (i.e.
  it no longer takes a cobra.Command)
- Use switch/case as it's slightly more compact than if/else
- Just build the string directly instead of using a list (slightly
  shorter)
- Change "build_status: ok" to "build_tainted" with a boolean value
  to ensure this is easier to parse in yaml (and more descriptive
  as "status" is quite generic and may mean many things to people).
- Extend the test_bib_version to test for the full strings prefixes
  in test_opts.

bib/cmd/bootc-image-builder/main.go

@@ -561,57 +561,38 @@ func rootPreRunE(cmd *cobra.Command, _ []string) error {
 	return nil
 }
 
-func cmdVersion() (string, error) {
+func versionFromBuildInfo() (string, error) {
 	info, ok := debug.ReadBuildInfo()
 	if !ok {
 		return "", fmt.Errorf("cannot read build info")
 	}
-	var gitRev string
-	var buildTime string
 	var buildTainted bool
-	ret := []string{}
+	gitRev := "unknown"
+	buildTime := "unknown"
 	for _, bs := range info.Settings {
-		if bs.Key == "vcs.revision" {
-			gitRev = bs.Value
-			continue
-		}
-		if bs.Key == "vcs.time" {
+		switch bs.Key {
+		case "vcs.revision":
+			gitRev = bs.Value[:7]
+		case "vcs.time":
 			buildTime = bs.Value
-			continue
-		}
-		if bs.Key == "vcs.modified" {
+		case "vcs.modified":
 			bT, err := strconv.ParseBool(bs.Value)
 			if err != nil {
 				logrus.Errorf("Error parsing 'vcs.modified': %v", err)
 				bT = true
 			}
-
 			buildTainted = bT
-			continue
 		}
 	}
-	if gitRev != "" {
-		ret = append(ret, fmt.Sprintf("build_revision: %s", gitRev[:7]))
-	} else {
-		ret = append(ret, "build_revision: unknown")
-	}
-	if buildTime != "" {
-		ret = append(ret, fmt.Sprintf("build_time: %s", buildTime))
-	}
-	if buildTainted {
-		ret = append(ret, "build_status: tainted")
-	} else {
-		ret = append(ret, "build_status: ok")
-	}
-
-	// append final newline
-	ret = append(ret, "")
 
-	return strings.Join(ret, "\n"), nil
+	return fmt.Sprintf(`build_revision: %s
+build_time: %s
+build_tainted: %v
+`, gitRev, buildTime, buildTainted), nil
 }
 
 func buildCobraCmdline() (*cobra.Command, error) {
-	version, err := cmdVersion()
+	version, err := versionFromBuildInfo()
 	if err != nil {
 		return nil, err
 	}

test/test_opts.py

@@ -169,8 +169,11 @@ def test_bib_version(tmp_path, container_storage, build_fake_container, version_
         capture_output=True, text=True, check=False)
     if git_res.returncode == 0:
         expected_rev = git_res.stdout.strip()
-    needle = f"revision: {expected_rev}"
-    assert needle in res.stdout
+    assert f"build_revision: {expected_rev}" in res.stdout
+    assert "build_time: " in res.stdout
+    assert "build_tainted: " in res.stdout
+    # we have a final newline
+    assert res.stdout[-1] == "\n"
 
 
 def test_bib_no_outside_container_warning_in_container(tmp_path, container_storage, build_fake_container):