This tutorial will show how to create a remote git server but every user you give permissions can contribute to every git project in the server.

To create a git server in which every project can see only the projects they have assigned, I suppose there are other solutions, but definitely this solution will not work, because in this tutorial every commit will be made by a generic git user that can read and write in every directory.

First, install git on your machine. In my case, because it's an ubuntu, I've run:

sudo apt-get install git 

I prefer to create a “normal” git user instead a system one. If you prefer to create a system user, just add the –system option to the command:

The –create-home option is needed because there we will be storing the public keys of the users of the repository.

useradd --create-home --user-group git

~$ mkdir .ssh
~$ chmod o=,g= .ssh
~$ cd .ssh
~/.ssh$ touch authorized_keys
~/.ssh$ chmod o=,g= authorized_keys

~$ cat public_key_of_first_user.pub >> .ssh/authorized_keys
~$ rm public_key_of_first_user.pub # you can remove the public key afterwards if you want

Check that you can make a ssh to the remote computer with no password request:

rluna@asustao:~$ ssh git@192.168.0.21
The authenticity of host '192.168.0.21 (192.168.0.21)' can't be established.
ED25519 key fingerprint is SHA256:PvSiThCnDq8pNOXyVgsq5vsXLME6oYIbCs0v5urvcpE.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '192.168.0.21' (ED25519) to the list of known hosts.

The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

git@ubuntu2004:~$ 

If this is step succeeds, you can continue.

In the server computer, I've created a ```/var/git``` directory to hold the repositories.

As root, do the following:

# mkdir /var/git 
# chown git:git /var/git
# chmod g=rx,o= /var/git

The permissions are set 750 to allow the git user to do anything inside the directory, and the group members to allow other users to read the contents: this will allow us to create other users that can read this directory by adding them to the group of the git user.

To create a repository, log in as the git user and make a git init –bare:

git$ cd /var/git
git$ mkdir repo1.git
git$ cd repo1.git
git$ git init --bare

Congrats! you have created your first repository. The .git extension of the directory is not needed, is just to make the url of the repository more cool.