Fix some trivial problems (#36336) (#36337)

Partially backport #36336

1. correctly parse git protocol's "OldCommit NewCommit RefName" line, it
should be explicitly split by space
2. trim space for the "commit status context name" to follow the same
behavior of git_model.NewCommitStatus

cmd/hook.go

@@ -163,6 +163,14 @@ func (n *nilWriter) WriteString(s string) (int, error) {
 	return len(s), nil
 }
 
+func parseGitHookCommitRefLine(line string) (oldCommitID, newCommitID string, refFullName git.RefName, ok bool) {
+	fields := strings.Split(line, " ")
+	if len(fields) != 3 {
+		return "", "", "", false
+	}
+	return fields[0], fields[1], git.RefName(fields[2]), true
+}
+
 func runHookPreReceive(ctx context.Context, c *cli.Command) error {
 	if isInternal, _ := strconv.ParseBool(os.Getenv(repo_module.EnvIsInternal)); isInternal {
 		return nil
@@ -228,14 +236,11 @@ Gitea or set your environment appropriately.`, "")
 			continue
 		}
 
-		fields := bytes.Fields(scanner.Bytes())
-		if len(fields) != 3 {
+		oldCommitID, newCommitID, refFullName, ok := parseGitHookCommitRefLine(scanner.Text())
+		if !ok {
 			continue
 		}
 
-		oldCommitID := string(fields[0])
-		newCommitID := string(fields[1])
-		refFullName := git.RefName(fields[2])
 		total++
 		lastline++
 
@@ -378,16 +383,13 @@ Gitea or set your environment appropriately.`, "")
 			continue
 		}
 
-		fields := bytes.Fields(scanner.Bytes())
-		if len(fields) != 3 {
+		var ok bool
+		oldCommitIDs[count], newCommitIDs[count], refFullNames[count], ok = parseGitHookCommitRefLine(scanner.Text())
+		if !ok {
 			continue
 		}
 
 		fmt.Fprintf(out, ".")
-		oldCommitIDs[count] = string(fields[0])
-		newCommitIDs[count] = string(fields[1])
-		refFullNames[count] = git.RefName(fields[2])
-
 		commitID, _ := git.NewIDFromString(newCommitIDs[count])
 		if refFullNames[count] == git.BranchPrefix+"master" && !commitID.IsZero() && count == total {
 			masterPushed = true

cmd/hook_test.go

@@ -39,3 +39,17 @@ func TestPktLine(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, []byte("0007a\nb"), w.Bytes())
 }
+
+func TestParseGitHookCommitRefLine(t *testing.T) {
+	oldCommitID, newCommitID, refName, ok := parseGitHookCommitRefLine("a b c")
+	assert.True(t, ok)
+	assert.Equal(t, "a", oldCommitID)
+	assert.Equal(t, "b", newCommitID)
+	assert.Equal(t, "c", string(refName))
+
+	_, _, _, ok = parseGitHookCommitRefLine("a\tb\tc")
+	assert.False(t, ok)
+
+	_, _, _, ok = parseGitHookCommitRefLine("a b")
+	assert.False(t, ok)
+}