fix: too long string written to cpe git.commitMessage (#5147)

* fix too long CPE string written to git/commitMessage

* Add debug log

* Fix debug log

* Truncate long git commit message title

* Add tests for truncateString

* Fix test

* Fix tests

* Fix tests

---------

Co-authored-by: Ivan Nikiforov <ivan.nikiforov@sap.com>

cmd/artifactPrepareVersion.go

@@ -237,7 +237,13 @@ func runArtifactPrepareVersion(config *artifactPrepareVersionOptions, telemetryD
 	commonPipelineEnvironment.git.commitID = gitCommitID // this commitID changes and is not necessarily the HEAD commitID
 	commonPipelineEnvironment.artifactVersion = newVersion
 	commonPipelineEnvironment.originalArtifactVersion = version
-	commonPipelineEnvironment.git.commitMessage = gitCommitMessage
+
+	gitCommitMessages := strings.Split(gitCommitMessage, "\n")
+	commitMessage := truncateString(gitCommitMessages[0], 50) // Github recommends to keep commit message title less than 50 chars
+
+	commonPipelineEnvironment.git.commitMessage = commitMessage
+
+	log.Entry().Debug("CPE git commitMessage:", commitMessage)
 
 	// we may replace GetVersion() above with GetCoordinates() at some point ...
 	coordinates, err := artifact.GetCoordinates()
@@ -254,6 +260,15 @@ func runArtifactPrepareVersion(config *artifactPrepareVersionOptions, telemetryD
 	return nil
 }
 
+func truncateString(str string, maxLength int) string {
+	chars := []rune(str)
+
+	if len(chars) > maxLength {
+		return string(chars[:maxLength]) + "..."
+	}
+	return str
+}
+
 func openGit() (gitRepository, error) {
 	workdir, _ := os.Getwd()
 	return gitUtils.PlainOpen(workdir)

cmd/artifactPrepareVersion_test.go

@@ -887,3 +887,33 @@ func TestPropagateVersion(t *testing.T) {
 		assert.Contains(t, fmt.Sprint(err), "failed to retrieve artifact")
 	})
 }
+
+func TestTruncateString(t *testing.T) {
+	t.Run("input string longer than maxLength - truncate", func(t *testing.T) {
+		inputStr := "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor"
+		expected := "Lorem ipsum dolor sit amet, consectetur adipiscing..."
+
+		outputStr := truncateString(inputStr, 50)
+		assert.Equal(t, outputStr, expected)
+	})
+
+	t.Run("input string shorter than maxLength - return as is", func(t *testing.T) {
+		inputStr := "Lorem ipsum dolor sit amet"
+		outputStr := truncateString(inputStr, 50)
+
+		assert.Equal(t, outputStr, inputStr)
+	})
+
+	t.Run("input string contains unicode chars", func(t *testing.T) {
+		inputStr := "パイパーは素晴らしい図書館です"
+		expected := "パイパーは..."
+
+		outputStr := truncateString(inputStr, 5)
+		assert.Equal(t, outputStr, expected)
+	})
+
+	t.Run("input string is empty", func(t *testing.T) {
+		outputStr := truncateString("", 5)
+		assert.Equal(t, outputStr, "")
+	})
+}