depot/modules/external-storage/strict-mounts.nix

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{ config, lib, ... }:
let
cfg = config.services.external-storage;
in
with lib;
{
options.systemd.services = mkOption {
type = with types; attrsOf (submodule ({ config, ... }: {
config = mkIf (config.strictMounts != []) (let
findFilesystemsFor = mount: pipe cfg.fileSystems [
(filterAttrs (_: fs: hasPrefix "${fs.mountpoint}/" "${mount}/"))
(mapAttrsToList (_: fs: "${fs.unitName}.service"))
];
services = flatten (map findFilesystemsFor config.strictMounts);
in {
after = services;
bindsTo = services;
});
}));
};
}