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If a kernel without CONFIG_UEVENT_HELPER set is used with NixOS, the file /proc/sys/kernel/hotplug does not exist. Before writing to it to disable this deprecated mechanism, we have to ensure it actually exists because otherwise the activation script will fail.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.