git本地仓库首次push到远程仓库出现错误![rejected]master>master(fetchfirst)

! [rejected]        master -> master (fetch first)

hint: Updates were rejected because the remote contains work that you do

hint: not have locally. This is usually caused by another repository pushing

hint: to the same ref. You may want to first integrate the remote changes

hint: (e.g., ‘git pull ...‘) before pushing again.

hint: See the ‘Note about fast-forwards‘ in ‘git push --help‘ for details.

解决很简单，使用强制推送

使用git push -f origin master 

git push [--all | --mirror | --tags] [--follow-tags] [--atomic] [-n | --dry-run] [--receive-pack=]
	   [--repo=] [-f | --force] [--prune] [-v | --verbose]
	   [-u | --set-upstream]
	   [--[no-]signed|--sign=(true|false|if-asked)]
	   [--force-with-lease[=[:]]]
	   [--no-verify] [ […?]]

Usually, the command refuses to update a remote ref that is not an ancestor of the local ref used to overwrite it. Also, when --force-with-lease option is used, the command refuses to update a remote ref whose current value does not match what is expected.

This flag disables these checks, and can cause the remote repository to lose commits; use it with care.

Note that --force applies to all the refs that are pushed, hence using it with push.default set to matching or with multiple push destinations configured with remote.*.push may overwrite refs other than the current branch (including local refs that are strictly behind their remote counterpart). To force a push to only one branch, use a + in front of the refspec to push (e.g git push origin +master to force a push to the master branch). See the... section above for details.