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|
{ config, lib, utils, pkgs, ... }: let
cfg = config.systemd.shutdownRamfs;
ramfsContents = let
storePaths = map (p: "${p}\n") cfg.storePaths;
contents = lib.mapAttrsToList (_: v: "${v.source}\n${v.target}") (lib.filterAttrs (_: v: v.enable) cfg.contents);
in pkgs.writeText "shutdown-ramfs-contents" (lib.concatStringsSep "\n" (storePaths ++ contents));
in {
options.systemd.shutdownRamfs = {
enable = lib.mkEnableOption (lib.mdDoc "pivoting back to an initramfs for shutdown") // { default = true; };
contents = lib.mkOption {
description = lib.mdDoc "Set of files that have to be linked into the shutdown ramfs";
example = lib.literalExpression ''
{
"/lib/systemd/system-shutdown/zpool-sync-shutdown".source = writeShellScript "zpool" "exec ''${zfs}/bin/zpool sync"
}
'';
type = utils.systemdUtils.types.initrdContents;
};
storePaths = lib.mkOption {
description = lib.mdDoc ''
Store paths to copy into the shutdown ramfs as well.
'';
type = lib.types.listOf lib.types.singleLineStr;
default = [];
};
};
config = lib.mkIf cfg.enable {
systemd.shutdownRamfs.contents."/shutdown".source = "${config.systemd.package}/lib/systemd/systemd-shutdown";
systemd.shutdownRamfs.storePaths = [pkgs.runtimeShell "${pkgs.coreutils}/bin"];
systemd.mounts = [{
what = "tmpfs";
where = "/run/initramfs";
type = "tmpfs";
}];
systemd.services.generate-shutdown-ramfs = {
description = "Generate shutdown ramfs";
wantedBy = [ "shutdown.target" ];
before = [ "shutdown.target" ];
unitConfig = {
DefaultDependencies = false;
RequiresMountsFor = "/run/initramfs";
ConditionFileIsExecutable = [
"!/run/initramfs/shutdown"
];
};
serviceConfig = {
Type = "oneshot";
ProtectSystem = "strict";
ReadWritePaths = "/run/initramfs";
ExecStart = "${pkgs.makeInitrdNGTool}/bin/make-initrd-ng ${ramfsContents} /run/initramfs";
};
};
};
}
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