#!/bin/bash

if [ -z "$PAM_USER" ]; then
	echo "did not receive PAM_USER env var"
	exit 1
fi

if ! id "$PAM_USER" &>/dev/null; then
	# NOTE(3wc): This generates a stable UID for the user based on the username;
	# without it, UID→username mapping changes on every container restart, which
	# creates file ownership issues and prevents RStudio from working.
	# See https://github.com/WASHNote/washnote-apps/issues/67
	uid=$(echo "$PAM_USER" | md5sum | grep -Eo "[[:digit:]]{3}"  | head -n1 | sed -E 's/^0+//')
	uid=$((1000+uid))
	adduser --uid="$uid" "$PAM_USER" --disabled-password --quiet --gecos ""
    usermod -aG staff "$PAM_USER"
fi

exit 0