Lay foundations for re-enabling windows tests: Start CSI-Proxy as a background Job. #122

boddumanohar · 2020-09-25T13:12:22Z

What type of PR is this?

/kind test

What this PR does / why we need it:
Currently we are skipping a lot of test cases in windows. This is because using a fakeMounter to test on windows is causing isues. This PR lays a basic foundations to run windows based tests related to node by running CSI-Proxy as a background job and the all the mount related operation will be handled by this proxy. For more in-depth design details for CSI-Proxy, please refer to the design doc: https://github.com/kubernetes/enhancements/blob/master/keps/sig-windows/20190714-windows-csi-support.md

Which issue(s) this PR fixes:

Requirements:

uses conventional commit messages
includes documentation
adds unit tests
tested upgrade from previous version

Special notes for your reviewer:

Added a script to .github.com/workflows/windows.yml that downloads and starts CSI-Proxy as windows background job.

Release note:

none

k8s-ci-robot · 2020-09-25T13:12:24Z

@boddumanohar: The label(s) kind/test cannot be applied, because the repository doesn't have them

In response to this:

What type of PR is this?

/kind test

What this PR does / why we need it:
Currently we are skipping a lot of test cases in windows. This is because using a fakeMounter to test on windows is causing isues. This PR lays a basic foundations to run windows based tests related to node by running CSI-Proxy as a background job and the all the mount related operation will be handled by this proxy. For more in-depth design details for CSI-Proxy, please refer to the design doc: https://github.com/kubernetes/enhancements/blob/master/keps/sig-windows/20190714-windows-csi-support.md

Which issue(s) this PR fixes:

Fixes #121

Requirements:

uses conventional commit messages

includes documentation

adds unit tests

tested upgrade from previous version

Special notes for your reviewer:

Added a script to .github.com/workflows/windows.yml that downloads and starts CSI-Proxy as windows background job.

Release note:
none

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

k8s-ci-robot · 2020-09-25T13:12:31Z

Hi @boddumanohar. Thanks for your PR.

I'm waiting for a kubernetes-csi member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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coveralls · 2020-09-25T13:20:25Z

Pull Request Test Coverage Report for Build 275289520

0 of 0 changed or added relevant lines in 0 files are covered.
No unchanged relevant lines lost coverage.
Overall coverage remained the same at 87.819%

Totals
Change from base Build 268691318:	0.0%
Covered Lines:	620
Relevant Lines:	706

💛 - Coveralls

andyzhangx · 2020-09-25T13:18:44Z

.github/workflows/windows.yml

+          # start the CSI Proxy before running tests on windows
+          # TODO: (boddumanohar) CSI-Proxy team are not building the csi-proxy.exe. Currently I am using a binary that I built. In future we should change to offcial repo.
+          Start-Job -Name CSIProx -ScriptBlock {
+            Invoke-WebRequest https://github.com/boddumanohar/csi-proxy/releases/download/v0.2.1/csi-proxy.zip -OutFile csi-proxy.zip;


could you use this binary: https://kubernetesartifacts.azureedge.net/csi-proxy/v0.2.0/binaries/csi-proxy.tar.gz ?

andyzhangx · 2020-09-25T13:19:30Z

pkg/smb/nodeserver_test.go

@@ -347,6 +393,7 @@ func TestNodeUnpublishVolume(t *testing.T) {
 	for _, test := range tests {
 		_, err := d.NodeUnpublishVolume(context.Background(), &test.req)
 		if !reflect.DeepEqual(err, test.expectedErr) {
+			fmt.Println(err)


remove this

andyzhangx · 2020-09-25T13:20:01Z

pkg/smb/nodeserver_test.go

+		platform = "windows"
+	}
+
+	fmt.Println(platform)


remove this

andyzhangx · 2020-09-25T13:22:08Z

pkg/smb/nodeserver_test.go

+	}
+	smbFile := map[string]string{
+		"linux":   "./smb.go",
+		"windows": "C:\\var\\lib\\kubelet\\smb.go",


why using this path C:\\var\\lib\\kubelet\\ on windows?

another way is using GetWorkDirPath: https://github.com/kubernetes-sigs/azurefile-csi-driver/blob/6e64aea79994672fcc356588d1c652db26fb9136/pkg/azurefile/nodeserver_test.go#L87

the reason why I am using that path is because, within the CSI-Proxy logs I get this error:

PS C:\Users\manoh\github\csi-proxy\bin> .\csi-proxy.exe -v 9 I0925 19:31:16.912285 17948 main.go:51] Starting CSI-Proxy Server ... I0925 19:31:16.913292 17948 main.go:52] Version: v0.2.1-2-g25491d0 I0925 19:31:39.611493 17948 server.go:122] calling PathExists with path "C:\\Users\\manoh\\github\\csi-driver-smb\\pkg\\smb\\smg.go" E0925 19:31:39.611493 17948 server.go:125] failed validatePathWindows path: C:\Users\manoh\github\csi-driver-smb\pkg\smb\smg.go is not within context path: C:\var\lib\kubelet

It explicitly tells here the path is supposed to be C:\\var\\lib\\kubelet\\,

then what about use func like this, that would be more clear in logic:

func getTestPath(path string) string { if runtime.GOOS == "windows" { return filepath.Join("C:\\var\\lib\\kubelet\\", path) } return filepath.Join("./", path) }

andyzhangx · 2020-09-25T15:03:15Z

pkg/smb/nodeserver_test.go

@@ -241,7 +261,8 @@ func TestNodePublishVolume(t *testing.T) {
 				TargetPath:        smbFile,
 				StagingTargetPath: sourceTest,
 				Readonly:          true},
-			expectedErr: status.Errorf(codes.Internal, "Could not mount target \"./smb.go\": mkdir ./smb.go: not a directory"),
+			expectedErrWindows: nil,


why it's nil on windows?

The CSI-Proxy is not returning any error for the above. Here are the CSI-Proxy logs:

I0925 20:14:06.058327 3480 main.go:51] Starting CSI-Proxy Server ... I0925 20:14:06.058327 3480 main.go:52] Version: v0.2.0-0-ga37f58f I0925 20:14:11.417233 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\smb.go" I0925 20:14:11.418235 3480 server.go:220] calling IsMountPoint with path "C:\\var\\lib\\kubelet\\smb.go" I0925 20:14:11.420241 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\smb.go" I0925 20:14:11.427243 3480 server.go:172] calling Rmdir with path "C:\\var\\lib\\kubelet\\smb.go" I0925 20:14:11.428252 3480 server.go:193] calling LinkPath with targetPath "C:\\var\\lib\\kubelet\\smb.go" sourcePath "C:\\var\\lib\\kubelet\\source_test" I0925 20:14:11.429237 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.430255 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.432234 3480 server.go:172] calling Rmdir with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.438235 3480 server.go:193] calling LinkPath with targetPath "C:\\var\\lib\\kubelet\\target_test" sourcePath "C:\\var\\lib\\kubelet\\error_mount_source" I0925 20:14:11.439234 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.439234 3480 server.go:220] calling IsMountPoint with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.440235 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.441235 3480 server.go:172] calling Rmdir with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.441235 3480 server.go:193] calling LinkPath with targetPath "C:\\var\\lib\\kubelet\\target_test" sourcePath "C:\\var\\lib\\kubelet\\source_test" I0925 20:14:11.442243 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\false_is_likely_exist_target" I0925 20:14:11.443232 3480 server.go:220] calling IsMountPoint with path "C:\\var\\lib\\kubelet\\false_is_likely_exist_target" I0925 20:14:11.443232 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\false_is_likely_exist_target" I0925 20:14:11.444234 3480 server.go:172] calling Rmdir with path "C:\\var\\lib\\kubelet\\false_is_likely_exist_target" I0925 20:14:11.444234 3480 server.go:193] calling LinkPath with targetPath "C:\\var\\lib\\kubelet\\false_is_likely_exist_target" sourcePath "C:\\var\\lib\\kubelet\\source_test" I0925 20:14:11.445234 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.445234 3480 server.go:220] calling IsMountPoint with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.446233 3480 server.go:122] calling PathExists with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.454239 3480 server.go:172] calling Rmdir with path "C:\\var\\lib\\kubelet\\target_test" I0925 20:14:11.454239 3480 server.go:193] calling LinkPath with targetPath "C:\\var\\lib\\kubelet\\target_test" sourcePath "C:\\var\\lib\\kubelet\\source_test"

Let me find out the exact reason for this behavior and will get back to you.

@andyzhangx This is because, on windows during Mount operation is called, under the hood we are actually calling linkPath. https://github.com/kubernetes-csi/csi-driver-smb/blob/master/pkg/mounter/safe_mounter_windows.go#L96. Linking a filepath to a directory which will succeed. Where as in unix we are actually performing an mount from file to a folder which will fail.

Do you have any suggestions on how this can fixed?

mount behavior between Linux and Windows is a little different, that's ok. Could you write code like this:

[]struct { desc string req csi.NodePublishVolumeRequest expectedErr error expectedErrLinux error expectedErrWindows error } ... expectedErr := test.expectedErr if test.expectedErrWindows != test.expectedErrLinux { if runtime.GOOS == "windows" { expectedErr = test.expectedErrWindows } else { expectedErr = test.expectedErrLinux } }

So in most cases, we only need to define expectedErr, and only need to define expectedErrLinux and expectedErrWindows when it's different. That would save test code.

andyzhangx · 2020-09-26T08:58:56Z

pkg/smb/nodeserver_test.go

@@ -241,7 +261,8 @@ func TestNodePublishVolume(t *testing.T) {
 				TargetPath:        smbFile,
 				StagingTargetPath: sourceTest,
 				Readonly:          true},
-			expectedErr: status.Errorf(codes.Internal, "Could not mount target \"./smb.go\": mkdir ./smb.go: not a directory"),
+			expectedErrWindows: nil,


mount behavior between Linux and Windows is a little different, that's ok. Could you write code like this:

[]struct { desc string req csi.NodePublishVolumeRequest expectedErr error expectedErrLinux error expectedErrWindows error } ... expectedErr := test.expectedErr if test.expectedErrWindows != test.expectedErrLinux { if runtime.GOOS == "windows" { expectedErr = test.expectedErrWindows } else { expectedErr = test.expectedErrLinux } }

So in most cases, we only need to define expectedErr, and only need to define expectedErrLinux and expectedErrWindows when it's different. That would save test code.

andyzhangx · 2020-09-26T08:59:44Z

pkg/smb/nodeserver_test.go

+
+	// For CSI-Proxy(windows), the path has to be absolute and it should be within the context of value passed for
+	// csi-proxy argument: --kubelet-pod-path. In our tests we are using `C:\var\lib\kubelet\`
+	getTestPath := func(path string) string {


pls move this function outside(standalone), other test cases would also needs this function, e.g. TestNodeUnpublishVolume

mayankshah1607 · 2020-09-26T12:06:01Z

pkg/smb/nodeserver_test.go

+		desc               string
+		req                csi.NodePublishVolumeRequest
+		expectedErr        error
+		expectedErrUnix    error
+		expectedErrWindows error


We currently have code to differentiate Windows and Linux errors. Try taking a look at - https://github.com/kubernetes-csi/csi-driver-smb/blob/master/test/utils/testutil/testutil.go#L28

This object holds the error messages for both Windows and Linux as a single entity. Also try looking at the following helper methods for assertion.
Why don't we try reusing that instead of re-introducing the same functionality?

Here's an example of this - https://github.com/kubernetes-csi/csi-driver-smb/blob/master/pkg/smb/nodeserver_test.go#L60

Thanks will update the PR accordingly.

I think using we might have to make some modification to the existing struct:

type TestError struct { WindowsError error DefaultError error }

In this struct, we are taking the DefaultError when the WindowsError is nil. But there are cases where we are explicitly asking to check with nil. In such cases its bit difficult to check for errors. So I propose a small modification to the struct to have a fields like:

type TestError struct { expectedError error WindowsError error DefaultError error }

So that explictly checking for windows error even if its nil is easier.

what are your thoughts on this?

@boddumanohar We're actually following the current approach in the azurefile and azuredisk repos for unit testing - https://github.com/kubernetes-sigs/azurefile-csi-driver , https://github.com/kubernetes-sigs/azuredisk-csi-driver

We didn't really have to make changes to the assertion logic there. It seems like you're suggesting this change because of the unexpected error given by TestNodeUnpublishVolume ([Error] Unmount error mocked by IsLikelyNotMountPoint) and TestNodeUnstageVolume ([Error] CleanupMountPoint error mocked by IsLikelyNotMountPoint). IMO, because these are unexpected errors from the CSI proxy, its best if we temporarily skip only these particular test cases on Windows until we figure out why CSI proxy is giving that issue, rather than accept these outliers as desired results without deeper investigation.

I've opened a PR here with the above thoughts, and keeping the same approach as azuredisk and azurefile repos - #123

@boddumanohar @andyzhangx Please let me know your thoughts and opinions, and we can make more changes accordingly. Thanks! :)

I think that's case by case

error mocked by IsLikelyNotMountPoint error is likely caused by no fake of IsLikelyNotMountPoint on Linux, so need to fix it on Linux, that may fix the issue?

[Error] Mount error mocked by Mount

it's caused by different mount behavior between linux and windows, for this case, let's only run on Linux

In general, I think we should use https://github.com/kubernetes-csi/csi-driver-smb/blob/master/test/utils/testutil/testutil.go#L28, it's more clear.

And if there is one case that only Linux would return error(Windows return nil), we could make it separate, e.g. add OnlyRunOnPlatform in test case struct, that would make logic more clear: positive and negative cases should be separated

point is TestError should really contain error, if it's nil, then it's not error. if there is one case that only Linux would return error(Windows return nil), we could make it separate, e.g. add OnlyRunOnPlatform in test case struct, that would make logic more clear: positive and negative cases should be separated

Cool. Let me try this out.

andyzhangx · 2020-09-26T12:18:34Z

.github/workflows/windows.yml

      - name: Build Test
        run: |
          make smb-windows
      - name: Run Windows Unit Tests
        run: |
+          # start the CSI Proxy before running tests on windows
+          Start-Job -Name CSIProx -ScriptBlock {
+            Invoke-WebRequest https://kubernetesartifacts.azureedge.net/csi-proxy/v0.2.0/binaries/csi-proxy.tar.gz -OutFile csi-proxy.tar.gz;


use v0.2.1

mayankshah1607 · 2020-09-26T12:29:00Z

pkg/smb/nodeserver_test.go

+	errorTarget := getTestPath("error_is_likely_target")
+	targetFile := getTestPath("abc.go")
+	targetTest := getTestPath("target_test")


We already have utility for generating test paths - https://github.com/kubernetes-csi/csi-driver-smb/blob/master/test/utils/testutil/testutil.go#L62

Can we reuse that?

In windows the path is supposed to be within the context of the value that was passed as this an argument to --kubelet-pod-path of csi-proxy binary The default is C:\\var\\lib\\kubelet\\. Since this is a new function, that required within the scope of the file nodeserver_test.go, I created a new function.

boddumanohar · 2020-09-27T15:25:42Z

Since most of the comments in this PR have been addressed by @mayankshah1607 in his PR#123. I've removed the changes related to tests and kept the original basis of this PR i.e to start CSI Proxy before running windows tests.

mayankshah1607 · 2020-09-27T18:25:13Z

Thanks @boddumanohar !
I will rebase my PR once this one is merged. :)

andyzhangx

/lgtm
/approve
/ok-to-test

k8s-ci-robot · 2020-09-27T23:50:30Z

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boddumanohar changed the title ~~fix TestNodePublishVolume test cases in Windows platform~~ fix TestNodePublishVolume, TestNodeUnpublishVolume, TestNodeUnstageVolume, TestIsCorruptedDir test cases in Windows platform Sep 26, 2020

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boddumanohar changed the title ~~fix TestNodePublishVolume, TestNodeUnpublishVolume, TestNodeUnstageVolume, TestIsCorruptedDir test cases in Windows platform~~ Lay foundations for re-enabling windows tests: Start CSI-Proxy as a background Job. Sep 27, 2020

Start CSI Proxy before running windows unit tests

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fake CSIProxyMounter to enable unit test #121

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REQUEST: New membership for boddumanohar kubernetes/org#2754

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Merge pull request kubernetes-csi#122 from sachinkumarsingh092/includ…

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Lay foundations for re-enabling windows tests: Start CSI-Proxy as a background Job. #122

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Lay foundations for re-enabling windows tests: Start CSI-Proxy as a background Job. #122

Lay foundations for re-enabling windows tests: Start CSI-Proxy as a background Job. #122

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