[FS#1052] dnsmasq hotplug script does not work inside ujail

[LEDE Bugs]

The following task has a new comment added:

FS#1052 - dnsmasq hotplug script does not work inside ujail
User who did this - Nathaniel Wesley Filardo (nwf)

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Having spent some quality time with strace, the answer seems to be that all of these must be bound into the jail as well:

/lib/functions.sh
/bin/ls
/etc/hotplug.d/dhcp
/etc/hotplug.d/tftp
/etc/hotplug.d/neigh

as well as anything actually used by the scripts in /etc/hotplug.d/{dhcp,tftp,neigh}.  The first two are requisite for /sbin/hotplug-call's operation; the next three are requisite for this use thereof.

However, the "anything used by" constraint is going to be somewhat trickier to fix in a general manner.  Perhaps making the /bin/busybox dispatcher available would be sufficient.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1052#comment3943