9fda4a5fe6
This also refactors the lcow and windows snapshotters to use go-winio's utility functions for checking the filesystem type. Signed-off-by: Eric Hotinger <ehotinger@gmail.com>
43 lines
1.3 KiB
Go
43 lines
1.3 KiB
Go
package fs
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import (
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"errors"
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"path/filepath"
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"syscall"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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// GetFileSystemType obtains the type of a file system through GetVolumeInformation.
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// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364993(v=vs.85).aspx
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func GetFileSystemType(path string) (fsType string, hr error) {
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drive := filepath.VolumeName(path)
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if len(drive) != 2 {
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return "", errors.New("getFileSystemType path must start with a drive letter")
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}
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var (
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modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
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procGetVolumeInformation = modkernel32.NewProc("GetVolumeInformationW")
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buf = make([]uint16, 255)
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size = windows.MAX_PATH + 1
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)
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drive += `\`
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n := uintptr(unsafe.Pointer(nil))
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r0, _, _ := syscall.Syscall9(procGetVolumeInformation.Addr(), 8, uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(drive))), n, n, n, n, n, uintptr(unsafe.Pointer(&buf[0])), uintptr(size), 0)
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if int32(r0) < 0 {
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hr = syscall.Errno(win32FromHresult(r0))
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}
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fsType = windows.UTF16ToString(buf)
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return
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}
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// win32FromHresult is a helper function to get the win32 error code from an HRESULT.
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func win32FromHresult(hr uintptr) uintptr {
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if hr&0x1fff0000 == 0x00070000 {
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return hr & 0xffff
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}
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return hr
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}
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