git "pre-push" hook stdin is empty

Question

I'm trying to create a pre-push hook that will prevent the user from pushing to a branch other than the one they're on.

Based on the the pre-push.sample (and various threads I've read) it looks like I should be able to read which local branch I am pushing and the remote one I'm pushing to via stdin with:

while read local_ref local_sha remote_ref remote_sha do ... done

However when I do this, local_ref and the other variables are empty (even when running the unedited sample hook, it never enters the loop).

Is there some configuration or other step I need to do to access the variables at stdin?

I'm using git version 2.17.1

Can you show us (a) exactly what your pre-push script looks like and (b) how you're resting it? The pre-push script does receive that information on stdin; without more context that loop looks fine. — larsks
– larsks, Commented Mar 12, 2019 at 2:42

James Walsh · Accepted Answer · 2021-09-01 15:39:42Z

From running into this same issue myself I believe you're seeing the same thing I was, if the push contains no changes i.e. when you run git push you see "Everything up-to-date" then the input line from stdin will be blank, there has to be some change being pushed for that line to be populated.

Johannes Filter · Accepted Answer · 2022-08-11 17:48:12Z

Please check if you run commands before the loop that already read stdin. In my case, I had some commands from git lfs in my pre-push script. I had to move the loop before that command.

command -v git-lfs >/dev/null 2>&1 || { echo >&2 "\nThis repository is configured for Git LFS but 'git-lfs' was not found on your path. If you no longer wish to use Git LFS, remove this hook by deleting '.git/hooks/pre-push'.\n"; exit 2; } git lfs pre-push "$@"

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