zcashd build fails intermittently with gpg "Cannot assign requested address"

[nathan-at-least]

I'm experiencing a non-deterministic failure when building the zcashd/Dockerfile. It's intermittent, so if I see it and just keep rerunning docker build -t zcashd . it will succeed after a time or two.

Here's the relevant snippet of output:

Executing: /tmp/apt-key-gpghome.sPPnYpMLLk/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 6DEF3BAF272766C0
gpg: keyserver receive failed: Cannot assign requested address

A quick google shows this error all over the place, and the first hit for me suggests a workaround of adding this to the Dockerfile:

RUN mkdir ~/.gnupg
RUN echo "disable-ipv6" >> ~/.gnupg/dirmngr.conf

I'm going to experiment with that in a branch. Does anyone else see this intermittent failure?

[nathan-at-least]

I couldn't reproduce this issue after a few tries, so I couldn't verify the workaround. I gave up and moved on with my project.