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authorlassulus <lass@aidsballs.de>2015-07-27 10:09:13 +0200
committerlassulus <lass@aidsballs.de>2015-07-27 10:09:13 +0200
commit54a01c0c74bdd4233962d62c4e6631f7f8b50f77 (patch)
tree705a3f8307b49e52bd95ecac8cd6d6ca828921a4 /Zpkgs/krebs/genid.nix
parent6476abd6ac7e000d0759569a1e2754acb2f518ca (diff)
parent3197897292f0fc8f38d30ad6ddc9742be4a7cc1d (diff)
Merge branch 'tv' into master
Diffstat (limited to 'Zpkgs/krebs/genid.nix')
-rw-r--r--Zpkgs/krebs/genid.nix22
1 files changed, 22 insertions, 0 deletions
diff --git a/Zpkgs/krebs/genid.nix b/Zpkgs/krebs/genid.nix
new file mode 100644
index 000000000..c75bec317
--- /dev/null
+++ b/Zpkgs/krebs/genid.nix
@@ -0,0 +1,22 @@
+{ lib, pkgs, ... }:
+
+pkgs.writeScriptBin "genid" ''
+ #! /bin/sh
+ # usage: genid NAME
+ set -euf
+
+ export PATH=${lib.makeSearchPath "bin" (with pkgs; [
+ bc
+ coreutils
+ ])}
+
+ name=$1
+ hash=$(printf %s "$name" | sha1sum | cut -d\ -f1 | tr a-f A-F)
+ echo "
+ min=2^24 # bigger than nobody and nogroup, see <nixos/modules/misc/ids.nix>
+ # and some spare for stuff like lxd.
+ max=2^32 # see 2^(8*sizeof(uid_t))
+ ibase=16
+ ($hash + min) % max
+ " | bc
+''