netifd: relax check in dhcp proto handler

Checking whether /sbin/udhcpc is a symbolic link breaks using the
DHCP proto handler inside procd-ujail where bind-mounts are used for
the resolved link. Check whether /sbin/udhcpc is executable instead
to allow using the proto handler for DHCP-provisioned containers.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit c5f113c43f43c20555298c8500bf91bffbe1f58b)

diff --git a/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh b/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
index 3034b2ba68ea7f69cae8bbca54e42c263e69cdd7..ea6d872eb4926c20a8a9ab6d6468988f00363da1 100755 (executable)
--- a/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
+++ b/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-[ -L /sbin/udhcpc ] || exit 0
+[ -x /sbin/udhcpc ] || exit 0
 
 . /lib/functions.sh
 . ../netifd-proto.sh