cimfs: Add cimfs writer

Add go wrappers over cimfs writer functions exported by cimfs.dll.

Signed-off-by: Amit Barve <ambarve@microsoft.com>

internal/hcs/schema2/cim_mount.go

@@ -0,0 +1,25 @@
+/*
+ * HCS API
+ *
+ * No description provided (generated by Swagger Codegen https://github.com/swagger-api/swagger-codegen)
+ *
+ * API version: 2.5
+ * Generated by: Swagger Codegen (https://github.com/swagger-api/swagger-codegen.git)
+ */
+
+package hcsschema
+
+const (
+ CimMountFlagNone uint32 = 0x0
+ CimMountFlagChildOnly uint32 = 0x1
+ CimMountFlagEnableDax uint32 = 0x2
+ CimMountFlagCacheFiles uint32 = 0x4
+ CimMountFlagCacheRegions uint32 = 0x8
+)
+
+type CimMount struct {
+ ImagePath string `json:"ImagePath,omitempty"`
+ FileSystemName string `json:"FileSystemName,omitempty"`
+ VolumeGuid string `json:"VolumeGuid,omitempty"`
+ MountFlags uint32 `json:"MountFlags,omitempty"`
+}

internal/winapi/cimfs.go

@@ -0,0 +1,45 @@
+package winapi
+
+import (
+ "unsafe"
+
+ "github.com/Microsoft/go-winio/pkg/guid"
+ "golang.org/x/sys/windows"
+)
+
+type g = guid.GUID
+type FsHandle uintptr
+type StreamHandle uintptr
+
+type CimFsFileMetadata struct {
+ Attributes uint32
+ FileSize int64
+
+ CreationTime windows.Filetime
+ LastWriteTime windows.Filetime
+ ChangeTime windows.Filetime
+ LastAccessTime windows.Filetime
+
+ SecurityDescriptorBuffer unsafe.Pointer
+ SecurityDescriptorSize uint32
+
+ ReparseDataBuffer unsafe.Pointer
+ ReparseDataSize uint32
+
+ ExtendedAttributes unsafe.Pointer
+ EACount uint32
+}
+
+//sys CimMountImage(imagePath string, fsName string, flags uint32, volumeID *g) (hr error) = cimfs.CimMountImage?
+//sys CimDismountImage(volumeID *g) (hr error) = cimfs.CimDismountImage?
+
+//sys CimCreateImage(imagePath string, oldFSName *uint16, newFSName *uint16, cimFSHandle *FsHandle) (hr error) = cimfs.CimCreateImage?
+//sys CimCloseImage(cimFSHandle FsHandle) (hr error) = cimfs.CimCloseImage?
+//sys CimCommitImage(cimFSHandle FsHandle) (hr error) = cimfs.CimCommitImage?
+
+//sys CimCreateFile(cimFSHandle FsHandle, path string, file *CimFsFileMetadata, cimStreamHandle *StreamHandle) (hr error) = cimfs.CimCreateFile?
+//sys CimCloseStream(cimStreamHandle StreamHandle) (hr error) = cimfs.CimCloseStream?
+//sys CimWriteStream(cimStreamHandle StreamHandle, buffer uintptr, bufferSize uint32) (hr error) = cimfs.CimWriteStream?
+//sys CimDeletePath(cimFSHandle FsHandle, path string) (hr error) = cimfs.CimDeletePath?
+//sys CimCreateHardLink(cimFSHandle FsHandle, newPath string, oldPath string) (hr error) = cimfs.CimCreateHardLink?
+//sys CimCreateAlternateStream(cimFSHandle FsHandle, path string, size uint64, cimStreamHandle *StreamHandle) (hr error) = cimfs.CimCreateAlternateStream?

internal/winapi/utils.go

@@ -80,3 +80,9 @@ func ConvertStringSetToSlice(buf []byte) ([]string, error) {
  }
  return nil, errors.New("string set malformed: missing null terminator at end of buffer")
 }
+
+// ParseUtf16LE parses a UTF-16LE byte array into a string (without passing
+// through a uint16 or rune array).
+func ParseUtf16LE(b []byte) string {
+ return windows.UTF16PtrToString((*uint16)(unsafe.Pointer(&b[0])))
+}

osversion/osversion_windows.go

@@ -5,6 +5,7 @@ import (
  "sync"
 
  "golang.org/x/sys/windows"
+ "golang.org/x/sys/windows/registry"
 )
 
 // OSVersion is a wrapper for Windows version information
@@ -57,3 +58,18 @@ func (osv OSVersion) String() string {
 func (osv OSVersion) ToString() string {
  return osv.String()
 }
+
+// Running `cmd /c ver` shows something like "10.0.20348.1000". The last component ("1000") is the revision
+// number
+func BuildRevision() (uint32, error) {
+ k, err := registry.OpenKey(registry.LOCAL_MACHINE, `SOFTWARE\Microsoft\Windows NT\CurrentVersion`, registry.QUERY_VALUE)
+ if err != nil {
+ return 0, fmt.Errorf("open `CurrentVersion` registry key: %w", err)
+ }
+ defer k.Close()
+ s, _, err := k.GetIntegerValue("UBR")
+ if err != nil {
+ return 0, fmt.Errorf("read `UBR` from registry: %w", err)
+ }
+ return uint32(s), nil
+}