stockholm/krebs/3modules/bindfs.nix

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{ config, pkgs, lib, ... }:
with lib;
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let
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cfg = config.krebs.bindfs;
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in {
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options.krebs.bindfs = mkOption {
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type = types.attrsOf (types.submodule ({ config, ... }: {
options = {
target = mkOption {
description = ''
destination where bindfs mounts to.
second positional argument to bindfs.
'';
default = config._module.args.name;
type = types.absolute-pathname;
};
source = mkOption {
description = ''
source folder where the mounted directory is originally.
first positional argument to bindfs.
'';
type = types.absolute-pathname;
};
options = mkOption {
description = ''
additional arguments to bindfs
'';
type = types.listOf types.str;
default = [];
};
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clearTarget = mkOption {
description = ''
whether to clear the target folder before mounting
'';
type = types.bool;
default = false;
};
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};
}));
default = {};
};
config = mkIf (cfg != {}) {
systemd.services = mapAttrs' (n: mount: let
name = replaceStrings [ "/" ] [ "_" ] n;
in nameValuePair "bindfs-${name}" {
wantedBy = [ "local-fs.target" ];
path = [ pkgs.coreutils ];
serviceConfig = {
ExecStartPre = pkgs.writeDash "bindfs-init-${name}" ''
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${optionalString mount.clearTarget ''
rm -rf '${mount.target}'
''}
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mkdir -p '${mount.source}'
mkdir -p '${mount.target}'
'';
ExecStart = "${pkgs.bindfs}/bin/bindfs -f ${concatStringsSep " " mount.options} ${mount.source} ${mount.target}";
};
}) cfg;
};
}