From d085a825d5f607bd5115c55438809e5754027a81 Mon Sep 17 00:00:00 2001 From: "Paul \"TBBle\" Hampson" Date: Sun, 3 Jan 2021 03:46:28 +1100 Subject: [PATCH] Tests for Volume Mount Point API wrappers These are a separate commit, because in order to implement the tests, a bunch of new modules were pulled into go.mod. And the tests only run as Administrator anyway. On the plus side, the tests exercise a few APIs in the vhd package: - CreateVirtualDisk - AttachVirtualDisk - DetachVirtualDisk - GetVirtualDiskPhysicalPath And in future, these tests could also exercise the DecodeReparsePoint API too, since it should be 1:1 with GetVolumeNameForVolumeMountPoint. Signed-off-by: Paul "TBBle" Hampson --- go.mod | 4 + go.sum | 112 +++++++++++++++++++++ pkg/volmount/volmount_test.go | 179 ++++++++++++++++++++++++++++++++++ 3 files changed, 295 insertions(+) create mode 100644 pkg/volmount/volmount_test.go diff --git a/go.mod b/go.mod index 98a8dea0..92ad4bac 100644 --- a/go.mod +++ b/go.mod @@ -3,7 +3,11 @@ module github.com/Microsoft/go-winio go 1.12 require ( + github.com/Microsoft/hcsshim v0.8.15-0.20210115015313-d25785cb2313 github.com/pkg/errors v0.9.1 github.com/sirupsen/logrus v1.7.0 + github.com/stretchr/testify v1.4.0 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c + gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect ) diff --git a/go.sum b/go.sum index aa6ad3b5..3c634c8e 100644 --- a/go.sum +++ b/go.sum @@ -1,14 +1,126 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1 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"github.com/Microsoft/go-winio/vhd" + "github.com/Microsoft/hcsshim/computestorage" + "github.com/pkg/errors" + "github.com/stretchr/testify/require" + "golang.org/x/sys/windows" +) + +// fullObjectIDFromObjectID turns the given class and objectID into an objectID suitable for calling +// wmi.ExecWmiMethod on. +// There should be an __PATH property on the object for this, according to wbemtest.exe, but I cannot see +// how to get it from the objects exposed by wmi. +func fullObjectIDFromObjectID(class, objectID string) string { + return class + `.ObjectId="` + strings.ReplaceAll(strings.ReplaceAll(objectID, `\`, `\\`), `"`, `\"`) + `"` +} + +// createNTFSVHD creates a VHD formatted with NTFS of size `sizeGB` at the given `vhdPath`. +// Copied from "github.com/Microsoft/hcsshim/internal/hcs".CreateNTFSVHD +func createNTFSVHD(ctx context.Context, vhdPath string, sizeGB uint32) (err error) { + if err := vhd.CreateVhdx(vhdPath, sizeGB, 1); err != nil { + return errors.Wrap(err, "failed to create VHD") + } + + vhd, err := vhd.OpenVirtualDisk(vhdPath, vhd.VirtualDiskAccessNone, vhd.OpenVirtualDiskFlagNone) + if err != nil { + return errors.Wrap(err, "failed to open VHD") + } + defer func() { + err2 := syscall.CloseHandle(vhd) + if err == nil { + err = errors.Wrap(err2, "failed to close VHD") + } + }() + + if err := computestorage.FormatWritableLayerVhd(ctx, windows.Handle(vhd)); err != nil { + return errors.Wrap(err, "failed to format VHD") + } + + return nil +} + +func mountAtAndCheck(t *testing.T, volumePath, mountPoint string) { + err := os.MkdirAll(mountPoint, 0) + if err != nil { + t.Fatal(err) + } + + err = SetVolumeMountPoint(mountPoint, volumePath) + if err != nil { + t.Fatal(err) + } + defer func() { + if t.Failed() { + deleteErr := DeleteVolumeMountPoint(mountPoint) + if deleteErr != nil { + // Assuming if we're already failing, failing more isn't wrong. + t.Fatal(deleteErr) + } + } + }() + + mountPointVolumePath, err := GetVolumeNameForVolumeMountPoint(mountPoint) + if err != nil { + t.Fatal(err) + } + + if mountPointVolumePath != volumePath { + t.Fatalf("Mount read-back incorrectly, expected %s; got %s", volumePath, mountPointVolumePath) + } +} + +// TestVolumeMountAPIs creates and attaches a small VHD, and then exercises the +// various mount-point APIs against it. +func TestVolumeMountSuccess(t *testing.T) { + + dir, err := ioutil.TempDir("", "volmountapis") + if err != nil { + t.Fatal(err) + } + defer os.RemoveAll(dir) + + vhdPath := filepath.Join(dir, "small.vhdx") + + // Replication of "github.com/Microsoft/hcsshim/internal/hcs".CreateNTFSVHD + err = createNTFSVHD(context.Background(), vhdPath, 1) + if err != nil { + if errno, ok := errors.Cause(err).(windows.Errno); ok && errno == windows.ERROR_PRIVILEGE_NOT_HELD { + t.Skip(err) + } + t.Fatal(err) + } + defer os.Remove(vhdPath) + + vhdHandle, err := vhd.OpenVirtualDisk(vhdPath, vhd.VirtualDiskAccessNone, vhd.OpenVirtualDiskFlagNone) + if err != nil { + t.Fatal(err) + } + defer syscall.CloseHandle(vhdHandle) + + // This needs to be done elevated, or with some specific permission anyway. + attachParams := vhd.AttachVirtualDiskParameters{Version: 2} + err = vhd.AttachVirtualDisk(vhdHandle, vhd.AttachVirtualDiskFlagNoDriveLetter, &attachParams) + if err != nil { + t.Fatal(err) + } + defer func() { + detachErr := vhd.DetachVirtualDisk(vhdHandle) + if detachErr != nil { + // assuming if we're already failing, failing more isn't wrong + t.Fatal(detachErr) + } + }() + + volumePath, err := computestorage.GetLayerVhdMountPath(context.Background(), windows.Handle(vhdHandle)) + if err != nil { + t.Fatal(err) + } + + // GetLayerVhdMountPath returns without the final \ + volumePath += "\\" + + mountPoints, err := GetMountPathsFromVolumeName(volumePath) + if err != nil { + t.Fatal(err) + } + + if len(mountPoints) != 0 { + t.Fatalf("Brand new volume was unexpectedly mounted at: %v", mountPoints) + } + + mountPoint0 := filepath.Join(dir, "mount0") + mountAtAndCheck(t, volumePath, mountPoint0) + defer func() { + deleteErr := DeleteVolumeMountPoint(mountPoint0) + if deleteErr != nil { + // Assuming if we're already failing, failing more isn't wrong. + t.Fatal(deleteErr) + } + }() + + mountPoints, err = GetMountPathsFromVolumeName(volumePath) + if err != nil { + t.Fatal(err) + } + + expectedMountPoints := []string{mountPoint0 + string(filepath.Separator)} + require.ElementsMatch(t, expectedMountPoints, mountPoints, "Mount apparently failed, expected %v (order irrelevant): got %v", expectedMountPoints, mountPoints) + + mountPoint1 := filepath.Join(dir, "mount1") + mountAtAndCheck(t, volumePath, mountPoint1) + defer func() { + deleteErr := DeleteVolumeMountPoint(mountPoint1) + if deleteErr != nil { + // Assuming if we're already failing, failing more isn't wrong. + t.Fatal(deleteErr) + } + }() + + mountPoints, err = GetMountPathsFromVolumeName(volumePath) + if err != nil { + t.Fatal(err) + } + + // No order guarantee on the mounts + expectedMountPoints = []string{mountPoint0 + string(filepath.Separator), mountPoint1 + string(filepath.Separator)} + require.ElementsMatch(t, expectedMountPoints, mountPoints, "Mount apparently failed, expected %v (order irrelevant): got %v", expectedMountPoints, mountPoints) + + // Note: DeleteVolumeMountPoint is tested in the defers above. +}