# $NetBSD: usergroupfuncs.Linux,v 1.6 2013/04/05 03:30:40 sbd Exp $
#
# Platform-specific adduser and addgroup functionality
# on top of shadow-utils.  (Not libuser)

# group_exists group [groupid]
#	Returns 0 if $group exists and has gid $groupid
#	Returns 1 if neither $group nor $groupid exist
#	Returns 2 if $group or $groupid exist but don't match
#	Returns 3 for all errors
#
group_exists()
{
	_group="$1"; _groupid="$2"
	${TEST} -n "$_group" || return 3

	# Check using chgrp to work properly in an NSS/NIS environment.
	_tmpdir="./.pkginstall.$$"
	${MKDIR} -p $_tmpdir 2>/dev/null || return 3
	${CHMOD} 0700 $_tmpdir
	_testpath="$_tmpdir/group_exists"
	${ECHO} > $_testpath
	if ${CHGRP} $_group $_testpath >/dev/null 2>&1; then
		# $_group exists
		_id=`${LS} -ln $_testpath 2>/dev/null | ${AWK} '{ print $4 }'`
		${TEST} -n "$_groupid" || _groupid=$_id
		if ${TEST} "$_groupid" = "$_id"; then
			${RM} -fr $_tmpdir; return 0
		fi
		${RM} -fr $_tmpdir; return 2
	elif ${TEST} -z "$_groupid"; then
		# $_group doesn't exist and $_groupid is not set
		${RM} -fr $_tmpdir; return 1
	elif ${CHGRP} $_groupid $_testpath >/dev/null 2>&1; then
		_name=`${LS} -l $_testpath 2>/dev/null | ${AWK} '{ print $4 }'`
		if ${TEST} "$_name" != "$_groupid"; then
			# $_group doesn't exist, but $_groupid exists
			${RM} -fr $_tmpdir; return 2
		fi
		# neither $_group nor $_groupid exist
		${RM} -fr $_tmpdir; return 1
	fi
	${RM} -fr $_tmpdir; return 3
}

# user_exists user [userid]
#	Returns 0 if $user exists and has uid $userid
#	Returns 1 if neither $user nor $userid exist
#	Returns 2 if $user or $userid exist but don't match
#	Returns 3 for all errors
#
user_exists()
{
	_user="$1"; _userid="$2"
	${TEST} -n "$_user" || return 3

	# Check using chown to work properly in an NSS/NIS environment.
	_tmpdir="./.pkginstall.$$"
	${MKDIR} -p $_tmpdir 2>/dev/null || return 3
	${CHMOD} 0700 $_tmpdir
	_testpath="$_tmpdir/user_exists"
	${ECHO} > $_testpath
	if ${CHOWN} $_user $_testpath >/dev/null 2>&1; then
		# $_user exists
		_id=`${LS} -ln $_testpath 2>/dev/null | ${AWK} '{ print $3 }'`
		${TEST} -n "$_userid" || _userid=$_id
		if ${TEST} "$_userid" = "$_id"; then
			${RM} -fr $_tmpdir; return 0
		fi
		${RM} -fr $_tmpdir; return 2
	elif ${TEST} -z "$_userid"; then
		# $_user doesn't exist and $_userid is not set
		${RM} -fr $_tmpdir; return 1
	elif ${CHOWN} $_userid $_testpath >/dev/null 2>&1; then
		_name=`${LS} -l $_testpath 2>/dev/null | ${AWK} '{ print $3 }'`
		if ${TEST} "$_name" != "$_userid"; then
			# $_user doesn't exist, but $_userid exists
			${RM} -fr $_tmpdir; return 2
		fi
		# neither $_user nor $_userid exist
		${RM} -fr $_tmpdir; return 1
	fi
	${RM} -fr $_tmpdir; return 3
}

# The useradd command on Linux is a complete mess.
# At least Red Hat derivatives want to create home directories
# by default. They have support for -M, but no --help.
# Other Linux distributions lack -M support, some at least have
# --help.
# LSB just wants useradd, but doesn't specify any behavior, so
# it is useless for writing portable scripts.

call_useradd()
{
	case $userid in
	"")
		${USERADD}					\
			-r -c "$descr" -d "$home" -s "$shell"	\
			-g $group $user "$@"
		;;
	*)
		${USERADD}					\
			-c "$descr" -d "$home" -s "$shell"	\
			-g $group -u $userid $user "$@"
		;;
	esac
}

# adduser user group [userid] [descr] [home] [shell]
adduser()
{
	user="$1"; group="$2"; userid="$3"
	descr="$4"; home="$5" shell="$6"
	${TEST} $# -eq 6 || return 1
	${TEST} -n "$user" || return 2
	${TEST} -n "$group" || return 2

	USERADD="@USERADD@"

	case $user in
	${PKGNAME%-[0-9]*})	descr_dflt="$user user" ;;
	*)			descr_dflt="${PKGNAME%-[0-9]*} $user user" ;;
	esac
	: ${descr:="$descr_dflt"}
	: ${home:="@PKG_USER_HOME@"}
	: ${shell:="@PKG_USER_SHELL@"}

	if ${TEST} -n "${USERADD}" -a -x "${USERADD}"; then
		${ECHO} "${PKGNAME}: Creating user \`\`$user''"
		if grep -i -- "^CREATE_HOME.*yes" /etc/login.defs > /dev/null; then
			call_useradd -M
		else
			call_useradd
		fi
	fi
	return 0
}

# adduser group [groupid]
addgroup()
{
	group="$1"; groupid="$2"
	${TEST} $# -eq 2 || return 1
	${TEST} -n "$group" || return 2

	GROUPADD="@GROUPADD@"

	if ${TEST} -n "${GROUPADD}" -a -x "${GROUPADD}"; then
		${ECHO} "${PKGNAME}: Creating group \`\`$group''"
		case $groupid in
		"")	${GROUPADD} -r $group ;;
		*)	${GROUPADD} -g $groupid $group ;;
		esac
	fi
	return 0
}