How do I update my bare repo?

If you want to duplicate all the objects from the main repo, do this inside the main repo:

git push --all <url-of-bare-repo>

Alternatively, do a fetch inside the bare repo:

git fetch <url-of-main-repo>

You cannot do a pull, because a pull wants to merge with HEAD, which a bare repo does not have.

You can add these as remotes to save yourself some typing in the future:

git remote add <whatever-name> <url-of-other-repo>

Then you can simply do

git push --all <whatever-name>

or

git fetch <whatever-name>

depending on what repo you're in. If <whatever-name> is origin, you can even leave it out altogether.

Disclaimer: I'm not a git guru. If I said something wrong, I'd like to be enlightened!

Update: Read the comments!

Assuming:

$ git clone --bare https://github.com/.../foo.git

Fetch with:

$ git --git-dir=foo.git fetch origin +refs/heads/*:refs/heads/* --prune

Note: --git-dir=foo.git is not required if you cd to the directory first.

I created a repository using the following command

git clone --bare <remote_repo>

Then I tried to update the bare clone using the answer by Thomas, but it didn't work for me. To get the bare repository to update (which is what I think Let_Me_Be was asking), I had to create a mirror repository:

git clone --mirror <remote_repo>

Then I could run the following command in the mirrored repository to grab the main repository's updates:

git fetch --all

I came across this solution by reading Mirror a Git Repository By Pulling

The only solution besides recreating with git clone --mirror is from Gregor:

git config remote.origin.fetch 'refs/heads/*:refs/heads/*'

then you can git fetch and you'll see the updates. The weird thing is that before this, even though there is a remote configured, it has no branches listed in git branch -a.