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Tests for Volume Mount Point API wrappers
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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 <Paul.Hampson@Pobox.com>
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TBBle committed Apr 21, 2021
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4 changes: 4 additions & 0 deletions go.mod
Original file line number Diff line number Diff line change
Expand Up @@ -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
)
112 changes: 112 additions & 0 deletions go.sum
Original file line number Diff line number Diff line change
@@ -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 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/Microsoft/go-winio v0.4.16-0.20201130162521-d1ffc52c7331/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
github.com/Microsoft/hcsshim v0.8.15-0.20210115015313-d25785cb2313 h1:utEQgxbItxt3z1yW5Ryw7qYWeBz5GpXVoSFXtb6fgjU=
github.com/Microsoft/hcsshim v0.8.15-0.20210115015313-d25785cb2313/go.mod h1:NtVKoYxQuTLx6gEq0L96c9Ju4JbRJ4nY2ow3VK6a9Lg=
github.com/cilium/ebpf v0.0.0-20200110133405-4032b1d8aae3/go.mod h1:MA5e5Lr8slmEg9bt0VpxxWqJlO4iwu3FBdHUzV7wQVg=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
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github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
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github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
github.com/sirupsen/logrus v1.4.1/go.mod h1:ni0Sbl8bgC9z8RoU9G6nDWqqs/fq4eDPysMBDgk/93Q=
github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
github.com/sirupsen/logrus v1.7.0 h1:ShrD1U9pZB12TX0cVy0DtePoCH97K8EtX+mg7ZARUtM=
github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
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golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200120151820-655fe14d7479/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201201145000-ef89a241ccb3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c h1:VwygUrnw9jn88c4u8GD3rZQbqrP/tgas88tPUbBxQrk=
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google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
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google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
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179 changes: 179 additions & 0 deletions pkg/volmount/volmount_test.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,179 @@
package volmount

import (
"context"
"io/ioutil"
"os"
"path/filepath"
"strings"
"syscall"
"testing"

"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.
}

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