Fix submodule parsing (#32571)

Fix #32568, parse `.gitmodules` correctly

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/git/config_test.go

@@ -0,0 +1,66 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func gitConfigContains(sub string) bool {
+	if b, err := os.ReadFile(HomeDir() + "/.gitconfig"); err == nil {
+		return strings.Contains(string(b), sub)
+	}
+	return false
+}
+
+func TestGitConfig(t *testing.T) {
+	assert.False(t, gitConfigContains("key-a"))
+
+	assert.NoError(t, configSetNonExist("test.key-a", "val-a"))
+	assert.True(t, gitConfigContains("key-a = val-a"))
+
+	assert.NoError(t, configSetNonExist("test.key-a", "val-a-changed"))
+	assert.False(t, gitConfigContains("key-a = val-a-changed"))
+
+	assert.NoError(t, configSet("test.key-a", "val-a-changed"))
+	assert.True(t, gitConfigContains("key-a = val-a-changed"))
+
+	assert.NoError(t, configAddNonExist("test.key-b", "val-b"))
+	assert.True(t, gitConfigContains("key-b = val-b"))
+
+	assert.NoError(t, configAddNonExist("test.key-b", "val-2b"))
+	assert.True(t, gitConfigContains("key-b = val-b"))
+	assert.True(t, gitConfigContains("key-b = val-2b"))
+
+	assert.NoError(t, configUnsetAll("test.key-b", "val-b"))
+	assert.False(t, gitConfigContains("key-b = val-b"))
+	assert.True(t, gitConfigContains("key-b = val-2b"))
+
+	assert.NoError(t, configUnsetAll("test.key-b", "val-2b"))
+	assert.False(t, gitConfigContains("key-b = val-2b"))
+
+	assert.NoError(t, configSet("test.key-x", "*"))
+	assert.True(t, gitConfigContains("key-x = *"))
+	assert.NoError(t, configSetNonExist("test.key-x", "*"))
+	assert.NoError(t, configUnsetAll("test.key-x", "*"))
+	assert.False(t, gitConfigContains("key-x = *"))
+}
+
+func TestSyncConfig(t *testing.T) {
+	oldGitConfig := setting.GitConfig
+	defer func() {
+		setting.GitConfig = oldGitConfig
+	}()
+
+	setting.GitConfig.Options["sync-test.cfg-key-a"] = "CfgValA"
+	assert.NoError(t, syncGitConfig())
+	assert.True(t, gitConfigContains("[sync-test]"))
+	assert.True(t, gitConfigContains("cfg-key-a = CfgValA"))
+}