integration: adjust tests for containerd snapshotters

[thaJeztah]

relates to #3761 (comment)

Attempt to adjust the tests to work with a docker daemon using the containerd snapshotters (which would have, e.g., "overlayfs" instead of "overlay2" as storage driver).

[thaJeztah]

haven't tested locally, so (ab)using CI to see if it passes, but looks like it needs approval again @dims 🙈 (is there some way around that, or is it for all contributors ?)

[dims]

i am here for you @thaJeztah :)

(not a GOOG employee, so am a guest here! can't fiddle with things)

[dims]

@thaJeztah for now please rebase your other PR, we pinned the SHA of the image:
https://github.com/google/cadvisor/pull/3760/files#diff-cd7456ced655187a04317519eb6843c67536f406233cf66105c2d9cfc592d96dR61

[thaJeztah]

Thank you! Yes, these are a bit of a nuisance; debugging CI usually is a bit of trial-and-error, and I'm not very familiar with the codebase, so that makes it extra fun.

OK got some other failures. Maybe I should look if I can run these tests locally somewhere; of course don't let me stop others from digging in as well! (for anyone stumbling on this PR).

@thaJeztah for now please rebase your other PR, we pinned the SHA of the image:

oh, thanks, will do!

[dims]

@thaJeztah can you please revert the change we made here:
https://github.com/google/cadvisor/pull/3760/changes#diff-cd7456ced655187a04317519eb6843c67536f406233cf66105c2d9cfc592d96dR61

and see if this still works?

[thaJeztah]

done! added a commit to revert it; let's see what breaks 😅 (ISTR things weren't happy before that, so possibly more changes are needed)

[dims]

interesting failure

=== RUN   TestDockerContainerSpec
I1217 13:29:10.867374     550 framework.go:370] About to run - [sudo docker run -d --cpu-shares 2048 --cpuset-cpus 0 --memory 1073741824 --env TEST_VAR=FOO --label bar=baz registry.k8s.io/pause]
    docker_test.go:224: 
I1217 13:29:10.998661     550 framework.go:370] About to run - [sudo docker rm -f 4df5979058f4b930aa09c193e4755275eb41c333dee377f3808a5b50e1b1e485]
        	Error Trace:	/go/src/github.com/google/cadvisor/integration/tests/api/docker_test.go:224
        	Error:      	Not equal: 
        	            	expected: 0x7fe
        	            	actual  : 0x11b9
        	Test:       	TestDockerContainerSpec
        	Messages:   	Container should have 2046 shares, has 4537
--- FAIL: TestDockerContainerSpec (0.21s)

[thaJeztah]

Wondering if it's related to;

• ConvertCPUSharesToCgroupV2Value: improve opencontainers/cgroups#20