Tarpaulin: Docker nightly support

[rubdos]

Currently working on a project that depends on some nightly features (impl Trait, amongst others).

It would be nice if there was a Docker container tag that contains a tarpaulin version compiled on Rust nightly, e.g., docker pull xd009642/tarpaulin:nightly.

[xd009642]

This does sound like a good idea, I'll make sure to provide an image built on nightly with my next release (whenever that may be)!

[xd009642]

@robinst given you contributed the dockerfile for tarpaulin and I've no clue about docker do you fancy helping with this? No pressure I'm sure I can figure it out if you're busy!

[robinst]

Looks like we could use the nightly base image for that: https://hub.docker.com/r/rustlang/rust/

So we'd probably want to have two images, one that is based on stable rust, and another one on nightly. It looks like you could set that up by:

• Copying the Dockerfile to Dockerfile-nightly
• Changing the first line in Dockerfile-nightly to FROM rustlang/rust:nightly

Then set up the automated build on Docker hub like this:

Let me know if that works or not, I could try it out on my fork too.

[xd009642]

I'm trying out the above suggestions now, I'm also adding the tags develop-nightly and develop so users can get the new as-yet unreleased features if they don't want to wait for a new release. I don't know how long it takes for dockerhub to build an image but at some point you can see if it works with docker pull xd009642/tarpaulin:develop-nightly!

Let me know if it works, I can try to find out if it does myself later but I don't have docker on this machine and tbh I've never really used it so little clue on getting started so may take me a while.

[robinst]

@xd009642 just tested it here and it worked :)

docker run --security-opt seccomp=unconfined -v "$PWD:/volume" xd009642/tarpaulin:develop-nightly

Don't forget adding it to the README. I also realized we should probably link to https://hub.docker.com/r/xd009642/tarpaulin/ somewhere in the README, and maybe add a docker badge?

[xd009642]

Thanks for the help, and I'll add it to the README and once that's done close this issue :+1:

[rubdos]

I'll go test it on my GitLab CI, thanks! :-)

Yeh, seems to come through. Now I just have to wait on #23 to be resolved and I'll have a nice coverage badge in my README! Thanks :-)

[xd009642]

And the readme is updated. I'm keeping an eye on the rustc PR that should fix #23 and I'll let you know when it's merged. I'm hoping that will fix it because that issue is a pain

[rubdos]

@xd009642 no requirement to let me know; I'm subscribed to that issue. And secondly, I'll magically see a coverage percentage appear in my own README. Hehe.