install.sh fails if IPv6 is disabled

[whocarez1]

This is a potential issue, currently in the dev branch: https://github.com/hioa-cs/IncludeOS/commit/65e30f5247e80ff4fe993078bead97b0f43ec55a#diff-1a047a09fc8a35724214c66a3f3e8af4R90

If IPv6 is disabled on the system, then create_bridge.sh fails when trying to assign an IPv6 configuration to the bridge. This makes the rest of install.sh fail and the chainloader is not built.

I did some quick testing, and one small workaround is something like this:

# check if ipv6 is not disabled
ipv6_disabled=$(sysctl -n net.ipv6.conf.$BRIDGE.disable_ipv6)
if [ $ipv6_disabled -eq 0 ]; then
     sudo ifconfig $BRIDGE inet6 add $GATEWAY6/$NETMASK6
else
   echo "    IPv6 is disabled for $BRIDGE."
fi

Sure, right now one can skip the bridge setup with the -n option, but another possibility could be another option to just skip setting up IPv6?

Anyway, you might be aware of this and IPv6-support in IncludeOS seems to be a recent addition.

[alfreb]

@whocarez1 sorry for the late reply - we've been vacationing :-) This is a very good point and I just ran into it myself. If you could create a PR with a solution that also works on mac that would be great. I dont know if it's necessary to do this check on mac at all so it might just be necessary to do the check you're suggesting only if linux.

[alfreb]

@niks3089 or @AndreasAakesson might know if this will be an issue on mac - they're leading the ipv6 development.

[AndreasAakesson]

I haven't figured out how to check the same thing on Mac, but the command you suggest won't work on Mac. Either you can figure it out as well (or me/someone else), or you can just wrap it inside a "Linux clause" as we do have a lot of already in our scripts (create_bridge.sh as an example).

[niks3089]

For mac, you could try ifconfig $BRIDGE | grep inet6 I am not sure if there is any sysctl key for mac per interface. The documentation on this seems to be sparse.