#!/bin/bash
####################################################
## Adduser script hack for Mac OS X
## Usage: adduser [-u UID] [-c COMM] [-d HOME] [-g GID] [-G GRP[,GRP...]]
##                [-s SHELL] USER
## Copyright 2007 by Adam Katz for ICS <www.ics.com> <scriptsATkhopiscom>, LGPL
####################################################
# See also http://lists.apple.com/archives/Darwinos-users/2002/Sep/msg00064.html

invalid() {
  echo "${0##*/}: $*  Try '${0##*/} --help'" >&2
  exit 1
}

while [ -n "$1" ]; do
  case "$1" in
    -u    ) uid="$2"  ;;
    -[Cc] ) full="$2" ;;
    -d    ) dir="$2"  ;;
    -g    ) gid="$2"  ;; # I think this has to be a number
    -G    ) grps="$2" ;;
    -s    ) shell="$2";;
    -h|--help ) sed -e '/^## /!d' -e 's///' "`which $0 || echo $0`"; exit 0 ;;
    -*    ) invalid "unknown option '$1' (maybe you need to space the args?)" ;;
  esac
  name="$1"
  shift; shift  # uh, "shift 2" is unsupported!
done

if [ -z "$name" ]; then invalid "no name specified."; fi

if [ -z "$uid" ]; then
  uid=`ls -ln /Users |awk '{printf $3"\n"}' |sort |uniq |tail -n1`
  uid=`expr 1 + $uid  2>/dev/null`
  if [ -z "$uid" ]; then
    echo "Unable to guess UID.  Please enter one with the -u flag." >&2
    exit 1
  fi
fi

fail() {
  echo "${0##*/}: Previous command FAILED, we're stopping here."
  break
}

do_it() {
  $runtest niutil -create     / /users/$name || fail
  $runtest niutil -createprop / /users/$name shell ${shell:=/bin/bash} || fail
  if [ -n "$full" ]; then
    $runtest niutil -createprop / /users/$name realname "$full" || fail
  fi
  $runtest niutil -createprop / /users/$name uid $uid || fail
  if [ -z "$gid" ]; then
    $runtest niutil -create     / /groups/$name || fail
    $runtest niutil -createprop / /groups/$name gid $uid || fail
  fi
  $runtest niutil -createprop / /users/$name gid ${gid:-$uid} || fail
  for group in ${grps//,/ }; do
    $runtest niutil -appendprop / /groups/$group users $name || fail
  done
  $runtest niutil -createprop / /users/$name home ${dir:=/Users/$name} || fail
  $runtest niutil -createprop / /users/$name _shadow_passwd || fail
  $runtest passwd $name || fail
}

echo "REMINDER:  This is not an Apple (or Fink) script."
echo "I am about to run this:"
runtest=echo do_it |sed 's/^/  /'

if [ "`uname -s`" != Darwin ]; then
  echo "This script is only supposed to be run on Mac OS ('Darwin').  Quitting."
  exit 1
fi

echo "Is this okay to run [yN]? "
read yn
if [ "${yn#[Yy]}" = "${yn}" ]
  then echo "Didn't do anything.  Please try again and/or fix me."; exit 0
fi

echo "Here it goes!"
for i in 1; do do_it; done  # for loop enables "break" command from failure

echo "Here's the output of finger and id:"
finger $name
id $name