Hi there, I am a new NixOS user, on a HP EliteBook 840 G3 notebook. I use it with Gnome 3. Before, I used Arch Linux with the i3 window manager for a couple of years.
Context: I installed CUPS via configuration.nix. Using a script provided by my employer’s IT department, I added a custom ppd file for our printing setup. This ppd file containes a CUPS filter that is used for authentication in the network. This filter is a Perl script.
This Perl script starts with a shebang of:
Executing the script in a terminal with my user results in:
no such file or directory: /usr/bin/perl
Indeed, the command
tells me that perl resides elsewhere, namely:
Replacing the original shebang with
makes the printer setup work. (I removed the “-w” because the script already contains “use warnings”)
However, I wonder what would be a more canonical NixOS way to do this. I don’t think the idea is to change every (Perl) script’s shebang. I found out and then remembered that a more robust way to write shebangs is with
and indeed, executing
just like this on the command line works, it gives me a Perl interactive shell. If I change the shebang of the script to this, and execute the script directly in my terminal, this also works (= does not crash, no error message). But inside the printer pipeline, it does not work: CUPS tells me “Filter failed”, and with journalctl I see
/usr/bin/env: 'perl': no such file or directory
It seems like the environment of the user CUPS runs with, is different than my environment.
What would be the NixOS way to fix this?