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#!/bin/sh
# /etc/newusr 6/7/91
# Usage: /etc/newusr user UserName parentdir [ shell ]
# Requires root permissions.

# File and directory names.
PFILE=/etc/passwd
GFILE=/etc/group
LOCK=/tmp/passwd.tmp
MAILDIR=/usr/spool/mail
SHELL=/bin/sh

# Check usage.
if /bin/test $# -ne 3 -a $# -ne 4
then
	echo "Usage: /etc/newusr user \"User Name\" parentdir [shell]" >&2 && exit 1
fi

# Use SHELL if specified.
if /bin/test $# -eq 4
then
	SHELL=$4
fi

# Lock out other access to password and group files.
if /bin/test -f $LOCK
then
	echo "newusr: lock file $LOCK exists" >&2 && exit 1
fi
>$LOCK

# Make sure invoker is root.
chown root $LOCK 2>/dev/null || echo "newusr: permission denied" >&2 && rm $LOCK && exit 1

# Sort $PFILE by uid and find max uid.
sort -n '-t:' +2 -3 -o $PFILE $PFILE
UID=`tail -1 $PFILE | sed -n "s/[^:]*:[^:]*:\\([^:]*\\).*/\\1/p"`

# Find gid for group "user".
GID=`egrep user $GFILE | sed -n "s/[^:]*:[^:]*:\\([^:]*\\).*/\\1/p"`

# Test if user exists already.
if egrep "^$1:" $PFILE >/dev/null
then
	echo "newusr:  user $1 already exists" >&2
else
	UID=`expr $UID + 1`
	HOME=$3/$1
	PROF=$HOME/.profile
	MAILBOX=$MAILDIR/$1
	echo "Adding user: uname=$1 uid=$UID gname=user gid=$GID HOME=$HOME shell=$SHELL"

	# Update password file.
	echo "$1::$UID:$GID:$2:$HOME:$SHELL" >>$PFILE

	# Update group file.
	cat $GFILE >$LOCK
	sed -e "/^user:/s/\$/,$1/" $LOCK >$GFILE

	# Make new directory, .profile, mailbox.
	mkdir -r $HOME || echo /etc/newusr: $HOME already exists
	echo "MAIL=$MAILBOX" >$PROF
	>$MAILBOX
	chown $1 $HOME $PROF $MAILBOX
	chgrp user $HOME $PROF $MAILBOX
fi

rm $LOCK
sync
exit 0

# end of /etc/newusr

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