Lefthook swallows STDERR for prepare-commit-msg

[marques-work]

I have a prepare-commit-msg script that prints to STDERR and exits with a failure code when certain conditions are not met. However, lefthook refuses to display any output, and instead only propagates the exit code, but all output (STDERR or STDOUT) are silenced. I do not have any skip_output configured or LEFTHOOK_QUIET set.

How can I get errors from the script to print to the console?

[mrexox]

Hey! Yes, there is a "hack" - lefthook uses prepare-commit-msg hook to synchronize the git hooks with hooks in a config. The output is disabled by default just not to disturb users on every commit.

To enable output anyway I can add a special ENV handling, like LEFTHOOK_VERBOSE=true which will enable all output without suppressing. WDYT about it? Would it solve the problem?

[marques-work]

Hi @mrexox, yes that sounds like it might. Let me give it a try and I'll let you know if this works well. Thanks for the quick reply!

[marques-work]

@mrexox hmm, setting LEFTHOOK_VERBOSE=true doesn't seem to change anything.

In my lefthook.yml, I have the following config:

prepare-commit-msg:
  scripts:
    "git-pair-commit-message.sh":
      runner: bash

And, in .lefthook/prepare-commit-msg/git-pair-commit-message.sh, I am echoing messages to both STDOUT and STDERR. Neither message is outputted to the console, though.

The way I am setting the environment variable is like so:

LEFTHOOK_VERBOSE=true git commit

Is this the correct way to do so? I have also tried export LEFTHOOK_VERBOSE=true and this also does not work.

[mrexox]

Hey! This feature is not implemented yet :) But I am on my way to release it with 1.1.4 today!

[marques-work]

Oh sorry, I misunderstood. But that's fast! Thanks!

[mrexox]

Please, tell if that works for you! Lefthook v1.1.4 is now available with LEFTHOOK_VERBOSE env support 🙂

[marques-work]

yes, it works! thank you :)