[GITEA] new doctor check: fix-push-mirrors-without-git-remote (#1853)

This adds a new `doctor` check: `fix-push-mirrors-without-git-remote`. The new check looks for push mirrors that do not have their remotes configured in git. If automatic fixing is enabled, it will remove these push mirrors from the database.

The check is not run by default, and thus, must be invoked manually. It should be usable in a half-migrated state, too, and as such, fixes #1800.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/1853
Co-authored-by: Gergely Nagy <forgejo@gergo.csillger.hu>
Co-committed-by: Gergely Nagy <forgejo@gergo.csillger.hu>
(cherry picked from commit 9038e07ef3)

models/repo/pushmirror.go

@@ -5,10 +5,16 @@ package repo
 
 import (
 	"context"
+	"fmt"
+	"path/filepath"
+	"strings"
 	"time"
 
 	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/git"
+	giturl "code.gitea.io/gitea/modules/git/url"
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
 
@@ -145,3 +151,21 @@ func PushMirrorsIterate(ctx context.Context, limit int, f func(idx int, bean any
 	}
 	return sess.Iterate(new(PushMirror), f)
 }
+
+// GetPushMirrorRemoteAddress returns the address of associated with a repository's given remote.
+func GetPushMirrorRemoteAddress(ownerName, repoName, remoteName string) (string, error) {
+	repoPath := filepath.Join(setting.RepoRootPath, strings.ToLower(ownerName), strings.ToLower(repoName)+".git")
+
+	remoteURL, err := git.GetRemoteAddress(context.Background(), repoPath, remoteName)
+	if err != nil {
+		return "", fmt.Errorf("get remote %s's address of %s/%s failed: %v", remoteName, ownerName, repoName, err)
+	}
+
+	u, err := giturl.Parse(remoteURL)
+	if err != nil {
+		return "", err
+	}
+	u.User = nil
+
+	return u.String(), nil
+}