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authortv <tv@shackspace.de>2015-08-29 00:36:50 +0200
committertv <tv@shackspace.de>2015-08-29 00:36:50 +0200
commit22a171f3e0405d504e8c8c3b32f73a8087a5ed66 (patch)
tree12d41954273e34f06cfbcf6e12f7fb64c7db2b4d /krebs/5pkgs/genid/default.nix
parent09257f97823e9a57cda749c2d5a69b18ef484cec (diff)
krebs pkgs += charybdis lentil much
While there, put everything into subdirectories.
Diffstat (limited to 'krebs/5pkgs/genid/default.nix')
-rw-r--r--krebs/5pkgs/genid/default.nix22
1 files changed, 22 insertions, 0 deletions
diff --git a/krebs/5pkgs/genid/default.nix b/krebs/5pkgs/genid/default.nix
new file mode 100644
index 000000000..c75bec317
--- /dev/null
+++ b/krebs/5pkgs/genid/default.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
+''