issue: Could not find Bash on NixOS while setting persist mode

[igor-frolikov]

Subject of the issue

[igor@nixos:~]$ sudo bat -t 80
Charging threshold set.
Use sudo bat --persist to persist the setting between restarts.

[igor@nixos:~]$ sudo bat -p
Could not find Bash on your system.

NixOS uses Bash as default shell. Please, check your shell calls. Setting threshold works fine.

Your system

OS: NixOS 22.05 (Quokka) x86_64
Host: ASUSTeK COMPUTER INC. X513IA
Kernel: 5.15.43

Version

0.9 (Latest)

Steps to reproduce

No response

Expected behaviour

No response

Actual behaviour

No response

[igor-frolikov]

It seems, that you need to add another bash path to your services.go: "/run/current-system/sw/bin/bash"
is it possible to use just "bash" string instead of the full path?

[tshakalekholoane]

Thank you for pointing that out, @igor-frolikov. I think it has to be the full path because some of these are run before path variables are set. But that said, there is probably a better way to set it. Can you check if running command -v bash gives the right location for Bash on your system?

[igor-frolikov]

[igor@nixos:~]$ command -v bash
/run/current-system/sw/bin/bash

NixOS has different file structure. Here are almost all symlinks. The path is standard for all NixOS Linux systems.
Another idea is replacing "bash" by "sh". This way "bin/sh" will work fine.

[tshakalekholoane]

Here's a fix. Please let me know if it works.

[igor-frolikov]

[igor@nixos:~/Downloads]$ sudo ./bat -c
100

[igor@nixos:~/Downloads]$ sudo ./bat -t 60
Charging threshold set.
Use sudo bat --persist to persist the setting between restarts.

[igor@nixos:~/Downloads]$ sudo ./bat -c
100

[igor@nixos:~/Downloads]$ sudo ./bat -p
2022/06/10 23:14:33 open /etc/systemd/system/bat-suspendthenhibernate.service: read-only file system

Actually NixOS would never allow to write to system files. Thank you for your efforts. I wrote a simple script for cron. Works perfect even on Arch. Just on NixOS I run cron job using NixOS way.