Simplify how git repositories are opened (#28937)

## Purpose
This is a refactor toward building an abstraction over managing git
repositories.
Afterwards, it does not matter anymore if they are stored on the local
disk or somewhere remote.

## What this PR changes
We used `git.OpenRepository` everywhere previously.
Now, we should split them into two distinct functions:

Firstly, there are temporary repositories which do not change:

```go
git.OpenRepository(ctx, diskPath)
```

Gitea managed repositories having a record in the database in the
`repository` table are moved into the new package `gitrepo`:

```go
gitrepo.OpenRepository(ctx, repo_model.Repo)
```

Why is `repo_model.Repository` the second parameter instead of file
path?
Because then we can easily adapt our repository storage strategy.
The repositories can be stored locally, however, they could just as well
be stored on a remote server.

## Further changes in other PRs
- A Git Command wrapper on package `gitrepo` could be created. i.e.
`NewCommand(ctx, repo_model.Repository, commands...)`. `git.RunOpts{Dir:
repo.RepoPath()}`, the directory should be empty before invoking this
method and it can be filled in the function only. #28940
- Remove the `RepoPath()`/`WikiPath()` functions to reduce the
possibility of mistakes.

---------

Co-authored-by: delvh <dev.lh@web.de>

1 files changed, 0 insertions, 23 deletions

diff --git a/modules/git/repo_branch.go b/modules/git/repo_branch.go
index 5958093975..979c5dec91 100644
--- a/modules/git/repo_branch.go
+++ b/modules/git/repo_branch.go
@@ -86,29 +86,6 @@ func (repo *Repository) GetBranch(branch string) (*Branch, error) {
 	}, nil
 }
 
-// GetBranchesByPath returns a branch by it's path
-// if limit = 0 it will not limit
-func GetBranchesByPath(ctx context.Context, path string, skip, limit int) ([]*Branch, int, error) {
-	gitRepo, err := OpenRepository(ctx, path)
-	if err != nil {
-		return nil, 0, err
-	}
-	defer gitRepo.Close()
-
-	return gitRepo.GetBranches(skip, limit)
-}
-
-// GetBranchCommitID returns a branch commit ID by its name
-func GetBranchCommitID(ctx context.Context, path, branch string) (string, error) {
-	gitRepo, err := OpenRepository(ctx, path)
-	if err != nil {
-		return "", err
-	}
-	defer gitRepo.Close()
-
-	return gitRepo.GetBranchCommitID(branch)
-}
-
 // GetBranches returns a slice of *git.Branch
 func (repo *Repository) GetBranches(skip, limit int) ([]*Branch, int, error) {
 	brs, countAll, err := repo.GetBranchNames(skip, limit)