https://stackoverflow.com/questions/2998832/git-pull-fails-unable-to-resolve-reference-unable-to-update-local-ref
git 更新本地refs
try to clean up local repository
$ git gc --prune=now
$ git remote prune originhttps://stackoverflow.com/questions/2998832/git-pull-fails-unable-to-resolve-reference-unable-to-update-local-ref
git 更新本地refs
try to clean up local repository
$ git gc --prune=now
$ git remote prune origin