refactor: correct git repo design and fix some legacy problems (#38512)

modules/git/gitcmd/repo.go

@@ -0,0 +1,28 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package gitcmd
+
+import (
+	"path/filepath"
+
+	"gitea.dev/modules/setting"
+)
+
+type RepositoryFacade interface {
+	GitRepoUniqueID() string
+	GitRepoLocation() string
+}
+
+func (c *Command) WithRepo(repo RepositoryFacade) *Command {
+	c.opts.Dir = RepoLocalPath(repo)
+	return c
+}
+
+func RepoLocalPath(repo RepositoryFacade) string {
+	repoLoc := repo.GitRepoLocation()
+	if filepath.IsAbs(repoLoc) {
+		return repoLoc
+	}
+	return filepath.Join(setting.RepoRootPath, filepath.FromSlash(repoLoc))
+}