git“预推”钩子标准输入为空

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

Answer 1

从我自己遇到同样的问题开始，我相信你看到的和我一样，如果推送不包含任何更改，即当你运行 git push 时，你会看到“一切都是最新的”，那么来自 stdin 的输入行将是空白的，必须推动一些更改才能填充该行。

Answer 2

First, make sure your hook is called at all.
That means:

• its name shoud be pre-push (no .sample )
• it should be executable (unless you are on Windows, in which case it is executable by default)

Answer 3

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 "$@"