Inherit submodules from template repository content (#16237)

Fix #10316

---------

Signed-off-by: Steffen Schröter <steffen@vexar.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/git/submodule_test.go

@@ -0,0 +1,48 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetTemplateSubmoduleCommits(t *testing.T) {
+	testRepoPath := filepath.Join(testReposDir, "repo4_submodules")
+	submodules, err := GetTemplateSubmoduleCommits(DefaultContext, testRepoPath)
+	require.NoError(t, err)
+
+	assert.Len(t, submodules, 2)
+
+	assert.EqualValues(t, "<°)))><", submodules[0].Path)
+	assert.EqualValues(t, "d2932de67963f23d43e1c7ecf20173e92ee6c43c", submodules[0].Commit)
+
+	assert.EqualValues(t, "libtest", submodules[1].Path)
+	assert.EqualValues(t, "1234567890123456789012345678901234567890", submodules[1].Commit)
+}
+
+func TestAddTemplateSubmoduleIndexes(t *testing.T) {
+	ctx := context.Background()
+	tmpDir := t.TempDir()
+	var err error
+	_, _, err = NewCommand(ctx, "init").RunStdString(&RunOpts{Dir: tmpDir})
+	require.NoError(t, err)
+	_ = os.Mkdir(filepath.Join(tmpDir, "new-dir"), 0o755)
+	err = AddTemplateSubmoduleIndexes(ctx, tmpDir, []TemplateSubmoduleCommit{{Path: "new-dir", Commit: "1234567890123456789012345678901234567890"}})
+	require.NoError(t, err)
+	_, _, err = NewCommand(ctx, "add", "--all").RunStdString(&RunOpts{Dir: tmpDir})
+	require.NoError(t, err)
+	_, _, err = NewCommand(ctx, "-c", "user.name=a", "-c", "user.email=b", "commit", "-m=test").RunStdString(&RunOpts{Dir: tmpDir})
+	require.NoError(t, err)
+	submodules, err := GetTemplateSubmoduleCommits(DefaultContext, tmpDir)
+	require.NoError(t, err)
+	assert.Len(t, submodules, 1)
+	assert.EqualValues(t, "new-dir", submodules[0].Path)
+	assert.EqualValues(t, "1234567890123456789012345678901234567890", submodules[0].Commit)
+}