From 78c12a8adca9f55e8faa5c86f102050c8a557b64 Mon Sep 17 00:00:00 2001
From: tv <tv@shackspace.de>
Date: Fri, 24 Jul 2015 23:19:49 +0200
Subject: Zpkgs {tv -> krebs} genid

---
 Zpkgs/krebs/default.nix |  1 +
 Zpkgs/krebs/genid.nix   | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 Zpkgs/krebs/genid.nix

(limited to 'Zpkgs/krebs')

diff --git a/Zpkgs/krebs/default.nix b/Zpkgs/krebs/default.nix
index 883890476..e07b96b56 100644
--- a/Zpkgs/krebs/default.nix
+++ b/Zpkgs/krebs/default.nix
@@ -6,6 +6,7 @@ in
 
 pkgs //
 {
+  genid = callPackage ./genid.nix {};
   github-hosts-sync = callPackage ./github-hosts-sync.nix {};
   github-known_hosts = callPackage ./github-known_hosts.nix {};
   hashPassword = callPackage ./hashPassword.nix {};
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
+''
-- 
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