2015-07-19 14:20:16 +00:00
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{ lib, pkgs, ... }:
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pkgs.writeScriptBin "genid" ''
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#! /bin/sh
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# usage: genid NAME
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set -euf
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export PATH=${lib.makeSearchPath "bin" (with pkgs; [
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bc
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coreutils
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])}
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name=$1
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hash=$(printf %s "$name" | sha1sum | cut -d\ -f1 | tr a-f A-F)
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echo "
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2015-07-22 17:09:27 +00:00
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min=2^24 # bigger than nobody and nogroup, see <nixos/modules/misc/ids.nix>
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# and some spare for stuff like lxd.
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2015-07-19 14:20:16 +00:00
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max=2^32 # see 2^(8*sizeof(uid_t))
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ibase=16
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($hash + min) % max
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" | bc
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''
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