I recently had to promote code from a development server to a production server. On the development server, I had a single Git repository. I wanted to be able to clone and pull this repository on the production server.
I was on a very limited system in which I could not install any additional software nor could I use an external git server such as GitHub, GitLab or Gitea.
The solution was to use the built-in git daemon.
This is how I did it:
Touch magic file
First, we need to create a magic file in order to allow git daemon to export the reposotiry.
On the development machine, run:
$ cd /dev_root/myproject $ cd .git $ touch git-daemon-export-ok
Run git daemon
Now it is time to run the actual git daemon. On the development machine, run:
$ cd /dev_root $ git daemon --reuseaddr --export-all --verbose --enable=receive-pack --base-path=.  Ready to rumble
This will start the git daemon on port 9418.
On the production server, I can not clone the repository:
$ cd /prod $ git clone git://devserver/myproject
Access is completely unauthenticated. This means that anyone that can reach the git daemon over the network will be able to access the repository.
Access is read-only.
This means that you can do
But you will not be able to do write operations such as git push.