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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.lvm;
in {
options.services.lvm = {
package = mkOption {
type = types.package;
default = if cfg.dmeventd.enable then pkgs.lvm2_dmeventd else pkgs.lvm2;
internal = true;
defaultText = literalExpression "pkgs.lvm2";
description = ''
This option allows you to override the LVM package that's used on the system
(udev rules, tmpfiles, systemd services).
Defaults to pkgs.lvm2, or pkgs.lvm2_dmeventd if dmeventd is enabled.
'';
};
dmeventd.enable = mkEnableOption "the LVM dmevent daemon";
boot.thin.enable = mkEnableOption "support for booting from ThinLVs";
};
config = mkMerge [
({
# minimal configuration file to make lvmconfig/lvm2-activation-generator happy
environment.etc."lvm/lvm.conf".text = "config {}";
})
(mkIf (!config.boot.isContainer) {
systemd.tmpfiles.packages = [ cfg.package.out ];
environment.systemPackages = [ cfg.package ];
systemd.packages = [ cfg.package ];
# TODO: update once https://github.com/NixOS/nixpkgs/pull/93006 was merged
services.udev.packages = [ cfg.package.out ];
})
(mkIf cfg.dmeventd.enable {
systemd.sockets."dm-event".wantedBy = [ "sockets.target" ];
systemd.services."lvm2-monitor".wantedBy = [ "sysinit.target" ];
environment.etc."lvm/lvm.conf".text = ''
dmeventd/executable = "${cfg.package}/bin/dmeventd"
'';
})
(mkIf cfg.boot.thin.enable {
boot.initrd = {
kernelModules = [ "dm-snapshot" "dm-thin-pool" ];
extraUtilsCommands = ''
for BIN in ${pkgs.thin-provisioning-tools}/bin/*; do
copy_bin_and_libs $BIN
done
'';
extraUtilsCommandsTest = ''
ls ${pkgs.thin-provisioning-tools}/bin/ | grep -v pdata_tools | while read BIN; do
$out/bin/$(basename $BIN) --help > /dev/null
done
'';
};
environment.etc."lvm/lvm.conf".text = concatMapStringsSep "\n"
(bin: "global/${bin}_executable = ${pkgs.thin-provisioning-tools}/bin/${bin}")
[ "thin_check" "thin_dump" "thin_repair" "cache_check" "cache_dump" "cache_repair" ];
})
(mkIf (cfg.dmeventd.enable || cfg.boot.thin.enable) {
boot.initrd.preLVMCommands = ''
mkdir -p /etc/lvm
cat << EOF >> /etc/lvm/lvm.conf
${optionalString cfg.boot.thin.enable (
concatMapStringsSep "\n"
(bin: "global/${bin}_executable = $(command -v ${bin})")
[ "thin_check" "thin_dump" "thin_repair" "cache_check" "cache_dump" "cache_repair" ]
)
}
${optionalString cfg.dmeventd.enable ''
dmeventd/executable = "$(command -v false)"
activation/monitoring = 0
''}
EOF
'';
})
];
}
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