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nixos/sane: ensure saned can access usb scanners #367198

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Dec 28, 2024
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nixos/sane: ensure saned can access usb scanners #367198

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6 changes: 6 additions & 0 deletions nixos/modules/services/hardware/sane.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -184,6 +184,12 @@ in
environment.etc."sane-config".source = config.hardware.sane.configDir;
environment.etc."sane-libs".source = "${saneConfig}/lib/sane";
services.udev.packages = backends;
# sane sets up udev rules that tag scanners with `uaccess`. This way, physically logged in users
# can access them without belonging to the `scanner` group. However, the `scanner` user used by saned
# does not have a real logind seat, so `uaccess` is not enough.
services.udev.extraRules = ''
ENV{DEVNAME}!="", ENV{libsane_matched}=="yes", RUN+="${pkgs.acl}/bin/setfacl -m g:scanner:rw $env{DEVNAME}"
'';

users.groups.scanner.gid = config.ids.gids.scanner;
networking.firewall.allowedUDPPorts = lib.mkIf config.hardware.sane.openFirewall [ 8612 ];
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