Git pre-received hook not failing with exit code 1 correcly

Heya!

I am trying to understand why my pre-publish hook does not exit with the correct status code.

I have a pre-publish script

``` #!/bin/sh set -euo pipefail echo "Testing nixos config" nixos-rebuild dry-build echo "Success" ```

Running it directly in my CLI, it acts like I would expect and return exit code 1.

```
$ ./.git/hooks/pre-receive
Testing nixos config
building the system configuration...
error:
       … while calling the 'seq' builtin
       ....
       ...

$ echo "$?" 1 ```

However, when running the script as a pre-receive hook, it is not running the commands correctly and returns the wrong exit code. I get the following:

```
remote: Testing nixos config
remote: building the system configuration...
remote: Success <-- ????
remote: error:
remote:        … while calling the 'seq' builtin
...
To myserver:/myrepo
   bffa94e..a14b3f6  main -> main
```

Any clue what I am missing? When running it as a pre-receive hook, the failing command returns exit code 0. Running it in the CLI, it returns exit code 1. It is Schrodinger's exit code.

Thank you so much for your help.

Sincerely, Marc