Allow empty list of nameservers #443
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DNS will obviously not find anything, but at least it still spins up on an offline machine. Signed-off-by: Jan Dubois <[email protected]>
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gvisor-tap-vsock is used by the Lima project to provide networking support when using the Apple Virtualization framework (VZ).
Up to version gvisor-tap-vsock 0.7.5 this worked fine to start a virtual machine even when the host is offline. In 0.8.0 this fails with a fatal error because
/etc/resolv.confis empty (#420), making it impossible to use Lima while offline (lima-vm/lima#3050).This check and error code seems to have been added to avoid a panic when accessing
nameservers[0](#417). At the time #420 was merged, the panicking code seems to already have been replaced. As far as I can tell, the only access is now viarange nameservers, which automatically does the right thing for an empty slice.I would like to see #420 reverted (conceptually) so that Lima can work offline again.
PS: The test passes
cd pkg/services/dns && go test ./..., but I haven't found any documentation on how to run the full set of tests (my naïve attempts showed failures even when runningmake teston themainbranch, so I guess it needs some additional setup).