nixos/sane: allow to disable enabled-by-default plugins

use case: disabling v4l plugin because I don't use my webcam as a
scanner.
This commit is contained in:
Symphorien Gibol 2021-02-19 16:49:49 +01:00
parent 6b1057b452
commit c64fb5000b
2 changed files with 21 additions and 4 deletions

View file

@ -32,7 +32,7 @@ let
};
backends = [ pkg netConf ] ++ optional config.services.saned.enable sanedConf ++ config.hardware.sane.extraBackends;
saneConfig = pkgs.mkSaneConfig { paths = backends; };
saneConfig = pkgs.mkSaneConfig { paths = backends; inherit (config.hardware.sane) disabledDefaultBackends; };
enabled = config.hardware.sane.enable || config.services.saned.enable;
@ -75,6 +75,16 @@ in
example = literalExample "[ pkgs.hplipWithPlugin ]";
};
hardware.sane.disabledDefaultBackends = mkOption {
type = types.listOf types.str;
default = [];
example = [ "v4l" ];
description = ''
Names of backends which are enabled by default but should be disabled.
See <literal>$SANE_CONFIG_DIR/dll.conf</literal> for the list of possible names.
'';
};
hardware.sane.configDir = mkOption {
type = types.str;
internal = true;

View file

@ -1,9 +1,10 @@
{ lib, stdenv }:
{ paths }:
{ paths, disabledDefaultBackends ? [] }:
with lib;
let installSanePath = path: ''
let
installSanePath = path: ''
if [ -e "${path}/lib/sane" ]; then
find "${path}/lib/sane" -maxdepth 1 -not -type d | while read backend; do
symlink "$backend" "$out/lib/sane/$(basename "$backend")"
@ -27,6 +28,10 @@ let installSanePath = path: ''
done
fi
'';
disableBackend = backend: ''
grep -q '${backend}' $out/etc/sane.d/dll.conf || { echo '${backend} is not a default plugin in $SANE_CONFIG_DIR/dll.conf'; exit 1; }
substituteInPlace $out/etc/sane.d/dll.conf --replace '${backend}' '# ${backend} disabled in nixos config'
'';
in
stdenv.mkDerivation {
name = "sane-config";
@ -42,5 +47,7 @@ stdenv.mkDerivation {
}
mkdir -p $out/etc/sane.d $out/etc/sane.d/dll.d $out/lib/sane
'' + concatMapStrings installSanePath paths;
''
+ (concatMapStrings installSanePath paths)
+ (concatMapStrings disableBackend disabledDefaultBackends);
}