After running nixos-rebuild switch, under some circumstances, the wpa_supplicant service is restarted. When that happens, I’m getting a systemd error:
Failed to open config file '/etc/wpa_supplicant.conf', error: No such file or directory
Here’s the full output of systemct status wpa_supplicant.service:
● wpa_supplicant.service - WPA Supplicant
Loaded: loaded (/nix/store/acpiv0f8w4l977c84bqspqgj3vkqj5zc-unit-wpa_supplicant.service/wpa_supplicant.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sat 2020-05-02 11:49:41 CEST; 7min ago
Process: 13426 ExecStart=/nix/store/2iz42l61bicrz6wmfkh7fifbgw38mrp0-unit-script-wpa_supplicant-start (code=exited, status=255/EXCEPTION)
Main PID: 13426 (code=exited, status=255/EXCEPTION)
IP: 0B in, 0B out
CPU: 4ms
May 02 11:49:41 jsf-nixOS systemd[1]: Started WPA Supplicant.
May 02 11:49:41 jsf-nixOS wpa_supplicant[13426]: Successfully initialized wpa_supplicant
May 02 11:49:41 jsf-nixOS wpa_supplicant[13426]: Failed to open config file '/etc/wpa_supplicant.conf', error: No such file or directory
May 02 11:49:41 jsf-nixOS wpa_supplicant[13426]: Failed to read or parse configuration '/etc/wpa_supplicant.conf'.
May 02 11:49:41 jsf-nixOS systemd[1]: wpa_supplicant.service: Main process exited, code=exited, status=255/EXCEPTION
May 02 11:49:41 jsf-nixOS systemd[1]: wpa_supplicant.service: Failed with result 'exit-code'.
The folder is indeed not present in my system. But I didn’t change any settings besides enabling networking.wireless.enable = true in my configuration.nix.