bin/genid: initial commit

1 files changed, 11 insertions, 0 deletions

diff --git a/bin/genid b/bin/genid
new file mode 100755
index 0000000..8e22407
--- /dev/null
+++ b/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