Input is not to a terminal (fd=0) error (within git hook)

[menaveenshankar]

Hello,
I am trying to use prompt_toolkit within a git hook (prepare-commit-msg). I get this warning - Input is not to a terminal (fd=0) I would appreciate any pointers on how to solve this.

I am using python 3.7.5. prompt_toolkit.__version__ = '2.0.10'

screenshot of the errors that follow -

[halloleo]

Not an expert on prompt-toolkit, but I would guess the problem is that prompt-toolkit
expects to be connected to a tty and in your hook you might not have a tty. I assume prompt-toolkit is called by a parent app. Why is that app calling into prompt-toolkit?

[menaveenshankar]

Hi halloleo, I have a tty connected, i.e. sys.stdin = open('/dev/tty', 'r') before I call the prompt() function. I am implementing autocomplete feature in the hook (the hook itself is in python). If I call the same functionality as a normal python script it works fine, but not within the hook environment even though I have a tty.

[halloleo]

prompt-toolkit needs unfortunately more than just a minimal tty. (see #1032).

[menaveenshankar]

prompt-toolkit needs unfortunately more than just a minimal tty. (see #1032).

ah i see, thanks for the info. On a related note, I tried a simpler version of autocomplete with the readline package, still doesn't work (posted it in sof too - link ). seems like there is some other issue within the git hook environment.