Escaping a comma in --driver-opt

[juergenthomann]

Hi

I'm trying to set a no_proxy variable with multiple comma separated values for buildx, but I'm unable to pass them to buildx without it complaining about the syntax. I also tried different ways to quote it but without success.

$ docker buildx create --use --driver-opt env.no_proxy='localhost,127.0.0.1'
error: invalid value "127.0.0.1", expecting k=v

Is there any way to escape it? I tried backslash as well before the comma without any difference.

[jedevc]

Sorry for the late reply, but I just had a similar question myself 😄

I think you should be able to escape by enclosing the key and the value in quotes, i.e. something like:

$ docker buildx create --use --driver-opt \'env.no_proxy=localhost,127.0.0.1\',adifferentopt=value

You need the backslashes to escape the quotes from bash so buildx actually gets them, and then you each key/value pair should be kept separate 🎉

[juergenthomann]

I tried the following command, but even with this style of escaping it parses it wrong and same error for bash and sh

$ docker buildx create --use --name test --driver-opt \'env.no_proxy=localhost,127.0.0.1\'
error: invalid value "127.0.0.1'", expecting k=v

With strace I can confirm, that docker is called with single quotes. I also tried it with just quoting the value and escaping it for bash, but same error message

execve("/usr/bin/docker", ["docker", "buildx", "create", "--use", "--name", "test", "--driver-opt", "'env.no_proxy=localhost,127.0.0.1'"]

[jedevc]

Right! Sorry, this is what I get for answering before having coffee 🤦

You need to use double quotes, not single quotes, my bad! So something like should actually work:

> $ docker buildx create --use --driver-opt \"env.no_proxy=localhost,127.0.0.1\",adifferentopt=value

[juergenthomann]

Thank you, I can confirm that escaped double quotes are working.

[snowdream]

I tried as follows and fix it:
docker/setup-buildx-action#57 (comment)