Don't rely on fuser being present

sh/rc-mount.sh

@@ -7,9 +7,7 @@
 # This isn't a real issue for the BSD's, but it is for Linux.
 do_unmount()
 {
-	type fuser >/dev/null 2>&1 || return 0
-
-	local cmd="$1" retval=0 retry=
+	local cmd="$1" retval=0 retry= pids=-
 	local f_opts="-m -c" f_kill="-s " mnt=
 	if [ "${RC_UNAME}" = "Linux" ]; then
 		f_opts="-m"
@@ -33,13 +31,17 @@ do_unmount()
 
 		retry=3
 		while ! LC_ALL=C ${cmd} "${mnt}" 2>/dev/null; do
-			# Don't kill if it's us (/ and possibly /usr)
-			local pids="$(fuser ${f_opts} "${mnt}" 2>/dev/null)"
+			if type fuser >/dev/null 2>&1; then
+				pids="$(fuser ${f_opts} "${mnt}" 2>/dev/null)"
+			fi
 			case " ${pids} " in
 				*" $$ "*)
 					eend 1 "failed because we are using" \
 					"${mnt}"
 					retry=0;;
+				" - ")
+					eend 1
+					retry=0;;
 				"  ")
 					eend 1 "in use but fuser finds nothing"
 					retry=0;;