bin/genid: initial commit

bin/genid

@@ -0,0 +1,11 @@
+#! /bin/sh
+# usage: genid NAME
+set -euf
+name=$1
+hash=$(printf %s "$name" | sha1sum | cut -d\  -f1 | tr a-f A-F)
+echo "
+  min=2^16  # bigger than nobody and nogroup, see <nixos/modules/misc/ids.nix>
+  max=2^32  # see 2^(8*sizeof(uid_t))
+  ibase=16
+  ($hash + min) % max
+" | bc