126 lines
3.5 KiB
Nix
126 lines
3.5 KiB
Nix
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.railcar;
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generateUnit = name: containerConfig:
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let
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container = pkgs.ociTools.buildContainer {
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args = [
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(pkgs.writeShellScript "run.sh" containerConfig.cmd).outPath
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];
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};
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in
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nameValuePair "railcar-${name}" {
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enable = true;
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = ''
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${cfg.package}/bin/railcar -r ${cfg.stateDir} run ${name} -b ${container}
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'';
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Type = containerConfig.runType;
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};
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};
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mount = with types; (submodule {
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options = {
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type = mkOption {
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type = str;
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default = "none";
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description = ''
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The type of the filesystem to be mounted.
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Linux: filesystem types supported by the kernel as listed in
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`/proc/filesystems` (e.g., "minix", "ext2", "ext3", "jfs", "xfs",
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"reiserfs", "msdos", "proc", "nfs", "iso9660"). For bind mounts
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(when options include either bind or rbind), the type is a dummy,
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often "none" (not listed in /proc/filesystems).
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'';
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};
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source = mkOption {
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type = str;
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description = "Source for the in-container mount";
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};
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options = mkOption {
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type = loaOf (str);
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default = [ "bind" ];
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description = ''
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Mount options of the filesystem to be used.
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Support optoions are listed in the mount(8) man page. Note that
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both filesystem-independent and filesystem-specific options
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are listed.
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'';
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};
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};
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});
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in
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{
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options.services.railcar = {
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enable = mkEnableOption "railcar";
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containers = mkOption {
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default = {};
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description = "Declarative container configuration";
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type = with types; loaOf (submodule ({ name, config, ... }: {
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options = {
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cmd = mkOption {
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type = types.lines;
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description = "Command or script to run inside the container";
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};
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mounts = mkOption {
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type = with types; attrsOf mount;
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default = {};
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description = ''
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A set of mounts inside the container.
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The defaults have been chosen for simple bindmounts, meaning
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that you only need to provide the "source" parameter.
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'';
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example = ''
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{ "/data" = { source = "/var/lib/data"; }; }
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'';
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};
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runType = mkOption {
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type = types.str;
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default = "oneshot";
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description = "The systemd service run type";
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};
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os = mkOption {
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type = types.str;
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default = "linux";
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description = "OS type of the container";
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};
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arch = mkOption {
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type = types.str;
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default = "x86_64";
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description = "Computer architecture type of the container";
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};
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};
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}));
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};
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stateDir = mkOption {
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type = types.path;
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default = ''/var/railcar'';
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description = "Railcar persistent state directory";
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};
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package = mkOption {
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type = types.package;
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default = pkgs.railcar;
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description = "Railcar package to use";
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};
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};
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config = mkIf cfg.enable {
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systemd.services = flip mapAttrs' cfg.containers (name: containerConfig:
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generateUnit name containerConfig
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);
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};
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}
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