Commit from non-existent user

How to Use GitLab Self-managed
1

Hi.
I found in our stand alone CE installation of GitLab the commit form user WeslyG, but there is no such user, and if I try to click on user login it will open Email form… How is it possible?

2018

2

I can configure any email in the git client configuration:
git config --global user.email lalala@skbkontur.ru
and make a commit.
And no one will ever understand who actually made this commit?
In addition, I can specify locally the Email of another GitLab user and make a commit. In this case, the interface will show that this other user made the commit. Is this a bug?

3

you can use custom-hooks to prevent such commits.
https://docs.gitlab.com/ee/administration/custom_hooks.html#doc-nav

mini example

#!/bin/bash
# --- Init
refname="$1"
oldrev="$2"
newrev="$3"
login=$(git show -s --format="%ae" $newrev)
-- check that login begin as "abc.def..."
if [[ $(echo "$login" | grep -Eio "^\w+\.\w+") == '' ]]; then
  echo "Wrong login: $login"
  exit 1;
fi;