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{ config, lib, pkgs, ... }:
with lib;
let
# gnupg's manual describes how to setup ccid udev rules:
# https://www.gnupg.org/howtos/card-howto/en/ch02s03.html
# gnupg folks advised me (https://dev.gnupg.org/T5409) to look at debian's rules:
# https://salsa.debian.org/debian/gnupg2/-/blob/debian/main/debian/scdaemon.udev
# the latest rev of the entire debian gnupg2 repo as of 2021-04-28
# the scdaemon.udev file was last commited on 2021-01-05 (7817a03):
scdaemonUdevRev = "01898735a015541e3ffb43c7245ac1e612f40836";
scdaemonRules = pkgs.fetchurl {
url = "https://salsa.debian.org/debian/gnupg2/-/raw/${scdaemonUdevRev}/debian/scdaemon.udev";
sha256 = "08v0vp6950bz7galvc92zdss89y9vcwbinmbfcdldy8x72w6rqr3";
};
# per debian's udev deb hook (https://man7.org/linux/man-pages/man1/dh_installudev.1.html)
destination = "60-scdaemon.rules";
scdaemonUdevRulesPkg = pkgs.runCommandNoCC "scdaemon-udev-rules" {} ''
loc="$out/lib/udev/rules.d/"
mkdir -p "''${loc}"
cp "${scdaemonRules}" "''${loc}/${destination}"
'';
cfg = config.hardware.gpgSmartcards;
in {
options.hardware.gpgSmartcards = {
enable = mkEnableOption "udev rules for gnupg smart cards";
};
config = mkIf cfg.enable {
services.udev.packages = [ scdaemonUdevRulesPkg ];
};
}
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