chore: fix test tempdir generation

[saintube]

Signed-off-by: saintube saintube@foxmail.com

Ⅰ. Describe what this PR does

Fix a failure of unit tests on mac os (but not fails CI in GitHub Actions).

Ⅱ. Does this pull request fix one issue?

The issue exists after PR #151 merged.

$ go test ./pkg/runtime/...
E0519 18:25:43.411020   40030 runtime.go:57] failed to get docker endpoint, error: docker endpoint does not exist
E0519 18:25:43.412342   40030 runtime.go:88] failed to get containerd endpoint, error: containerd endpoint does not exist
E0519 18:25:43.413709   40030 runtime.go:57] failed to get docker endpoint, error: docker endpoint does not exist
E0519 18:25:43.415042   40030 runtime.go:63] failed to create docker runtime handler, error: Unix socket path "/var/folders/wf/0n_kt22d1ld90gfmbq0k8z5c0000gp/T/Test_GetRuntimeHandlertest_have_dockerRuntime_but_need_containerd758888209/001/var/run/docker.sock" is too long
--- FAIL: Test_GetRuntimeHandler (0.01s)
    --- FAIL: Test_GetRuntimeHandler/test_have_dockerRuntime_but_need_containerd (0.00s)
        runtime_test.go:136: 
                Error Trace:    runtime_test.go:136
                Error:          Not equal: 
                                expected: false
                                actual  : true
                Test:           Test_GetRuntimeHandler/test_have_dockerRuntime_but_need_containerd
                Messages:       Unix socket path "/var/folders/wf/0n_kt22d1ld90gfmbq0k8z5c0000gp/T/Test_GetRuntimeHandlertest_have_dockerRuntime_but_need_containerd758888209/001/var/run/docker.sock" is too long
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0xf8 pc=0x1f25452]

goroutine 68 [running]:
testing.tRunner.func1.2({0x203dae0, 0x2f5f6b0})
        /Users/home/sdk/go1.17.9/src/testing/testing.go:1209 +0x24e
testing.tRunner.func1()
        /Users/home/sdk/go1.17.9/src/testing/testing.go:1212 +0x218
panic({0x203dae0, 0x2f5f6b0})
        /Users/home/sdk/go1.17.9/src/runtime/panic.go:1038 +0x215
github.com/koordinator-sh/koordinator/pkg/runtime.Test_GetRuntimeHandler.func1(0xc000503380)
        /Users/home/go/src/github.com/koordinator-sh/koordinator/pkg/runtime/runtime_test.go:138 +0x4f2
testing.tRunner(0xc000503380, 0xc0002f1c20)
        /Users/home/sdk/go1.17.9/src/testing/testing.go:1259 +0x102
created by testing.(*T).Run
        /Users/home/sdk/go1.17.9/src/testing/testing.go:1306 +0x35a
FAIL    github.com/koordinator-sh/koordinator/pkg/runtime       1.527s
--- FAIL: Test_Docker_NewDockerRuntimeHandler (0.00s)
--- FAIL: Test_Docker_StopContainer (0.00s)
--- FAIL: Test_Docker_UpdateContainerResources (0.00s)
FAIL
FAIL    github.com/koordinator-sh/koordinator/pkg/runtime/handler       0.938s
?       github.com/koordinator-sh/koordinator/pkg/runtime/handler/mockclient    [no test files]
FAIL

Ⅲ. Describe how to verify it

make test gets no error

Ⅳ. Special notes for reviews

related issues:

• os: TempDir() different between OSx and Linux golang/go#21318
• metrics: unix socket path too long in some system kata-containers/kata-containers#497
• Shorten the unix socket path for shim containerd/containerd#3046

[Juneezee]

On MacOS, the maximum path length of Unix domain socket is 104 characters, see https://unix.stackexchange.com/a/367012/376279

According to the logs, it seems like t.TempDir() uses /var/folders/wf/0n_kt22d1ld90gfmbq0k8z5c0000gp/T insteads of /tmp on MacOS, which is why it is complaining that the socket path is too long.

[codecov-commenter]

Codecov Report

Merging #156 (1a4a74f) into main (803298b) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 1a4a74f differs from pull request most recent head 2f5073f. Consider uploading reports for the commit 2f5073f to get more accurate results

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   56.90%   56.92%   +0.02%     
==========================================
  Files          86       86              
  Lines        7882     7887       +5     
==========================================
+ Hits         4485     4490       +5     
  Misses       3004     3004              
  Partials      393      393              

Flag	Coverage Δ
unittests	56.92% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/util/system/util_test_tool.go	56.66% <100.00%> (+2.54%)	⬆️

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[jasonliu747]

/lgtm
/approve

[saintube]

On MacOS, the maximum path length of Unix domain socket is 104 characters, see https://unix.stackexchange.com/a/367012/376279

According to the logs, it seems like t.TempDir() uses /var/folders/wf/0n_kt22d1ld90gfmbq0k8z5c0000gp/T insteads of /tmp on MacOS, which is why it is complaining that the socket path is too long.

Yes. According to golang/go#21318 , this difference between OS platforms comes from os.TempDir(). We can set the environment variable $TMPDIR to change the base directory of os.TempDir().

[jasonliu747]

/lgtm

[jasonliu747]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes, jasonliu747

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