Fix sysfs mount.

[maleadt]

Fixes #98, supersedes #97.

[codecov]

Codecov Report

Merging #99 (165e5cc) into main (00b3386) will decrease coverage by 0.52%.
The diff coverage is n/a.

❗ Current head 165e5cc differs from pull request most recent head 609658b. Consider uploading reports for the commit 609658b to get more accurate results

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   80.14%   79.61%   -0.53%     
==========================================
  Files           6        6              
  Lines         569      569              
==========================================
- Hits          456      453       -3     
- Misses        113      116       +3     

Impacted Files	Coverage Δ
src/Sandbox.jl	73.04% <0.00%> (-2.61%)	⬇️

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[maleadt]

DockerExecutor failures with the nested test unrelated, and also happen on v1.3.0: #100. So this should be good to go, I think.

EDIT: the failure is due to docker not being available in the nested environment. That seems obvious; how did this ever work? @staticfloat

[staticfloat]

The inner child of nesting can only really ever work with an unprivileged user namespace executor. Previously, the nesting test that uses docker would use the DockerExecutor on the outside, but the unprivileged usernamespace executor on the inside. Looking at the build logs, it seems that the UnprivilegedUserNamespaceExecutor was completely broken on the CI machine, so those tests were all getting skipped. I've since taken a look, and it appears this is because there are some inaccessible mount points listed in the kernel's list of mounts. I've pushed a commit that works locally, let's see if it works on CI.

[staticfloat]

Looks good!

[maleadt]

Great! Care to tag a new version, or do you want to have this on master for a while?

[staticfloat]

I'm going to tag a new version once I can successfully deploy the new JLL to some of our buildbots. I've run into a few issues (such as not having a valid /etc/mtab) that I'm ironing out. :)

Thanks for fixing this!