Use the type RefName for all the needed places and fix pull mirror sync bugs (#24634)

This PR replaces all string refName as a type `git.RefName` to make the
code more maintainable.

Fix #15367
Replaces #23070 
It also fixed a bug that tags are not sync because `git remote --prune
origin` will not remove local tags if remote removed.

We in fact should use `git fetch --prune --tags origin` but not `git
remote update origin` to do the sync.

Some answer from ChatGPT as ref.

> If the git fetch --prune --tags command is not working as expected,
there could be a few reasons why. Here are a few things to check:
> 
>Make sure that you have the latest version of Git installed on your
system. You can check the version by running git --version in your
terminal. If you have an outdated version, try updating Git and see if
that resolves the issue.
> 
>Check that your Git repository is properly configured to track the
remote repository's tags. You can check this by running git config
--get-all remote.origin.fetch and verifying that it includes
+refs/tags/*:refs/tags/*. If it does not, you can add it by running git
config --add remote.origin.fetch "+refs/tags/*:refs/tags/*".
> 
>Verify that the tags you are trying to prune actually exist on the
remote repository. You can do this by running git ls-remote --tags
origin to list all the tags on the remote repository.
> 
>Check if any local tags have been created that match the names of tags
on the remote repository. If so, these local tags may be preventing the
git fetch --prune --tags command from working properly. You can delete
local tags using the git tag -d command.

---------

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

1 files changed, 38 insertions, 0 deletions

diff --git a/modules/git/ref_test.go b/modules/git/ref_test.go
new file mode 100644
index 0000000000..58f679b7d6
--- /dev/null
+++ b/modules/git/ref_test.go
@@ -0,0 +1,38 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRefName(t *testing.T) {
+	// Test branch names (with and without slash).
+	assert.Equal(t, "foo", RefName("refs/heads/foo").BranchName())
+	assert.Equal(t, "feature/foo", RefName("refs/heads/feature/foo").BranchName())
+
+	// Test tag names (with and without slash).
+	assert.Equal(t, "foo", RefName("refs/tags/foo").TagName())
+	assert.Equal(t, "release/foo", RefName("refs/tags/release/foo").TagName())
+
+	// Test pull names
+	assert.Equal(t, "1", RefName("refs/pull/1/head").PullName())
+	assert.Equal(t, "my/pull", RefName("refs/pull/my/pull/head").PullName())
+
+	// Test for branch names
+	assert.Equal(t, "main", RefName("refs/for/main").ForBranchName())
+	assert.Equal(t, "my/branch", RefName("refs/for/my/branch").ForBranchName())
+
+	// Test commit hashes.
+	assert.Equal(t, "c0ffee", RefName("c0ffee").ShortName())
+}
+
+func TestRefURL(t *testing.T) {
+	repoURL := "/user/repo"
+	assert.Equal(t, repoURL+"/src/branch/foo", RefURL(repoURL, "refs/heads/foo"))
+	assert.Equal(t, repoURL+"/src/tag/foo", RefURL(repoURL, "refs/tags/foo"))
+	assert.Equal(t, repoURL+"/src/commit/c0ffee", RefURL(repoURL, "c0ffee"))
+}