// volumeAttachmentDevicePath returns the absolute device path for
// a volume attachment. The value is only meaningful in the context
// of the machine that the volume is attached to.
func volumeAttachmentDevicePath(
volumeInfo state.VolumeInfo,
volumeAttachmentInfo state.VolumeAttachmentInfo,
blockDevice state.BlockDeviceInfo,
) (string, error) {
if volumeInfo.HardwareId != "" || volumeAttachmentInfo.DeviceName != "" || volumeAttachmentInfo.DeviceLink != "" {
// Prefer the volume attachment's information over what is
// in the published block device information.
var deviceLinks []string
if volumeAttachmentInfo.DeviceLink != "" {
deviceLinks = []string{volumeAttachmentInfo.DeviceLink}
}
return storage.BlockDevicePath(storage.BlockDevice{
HardwareId: volumeInfo.HardwareId,
DeviceName: volumeAttachmentInfo.DeviceName,
DeviceLinks: deviceLinks,
})
}
return storage.BlockDevicePath(BlockDeviceFromState(blockDevice))
}
func testBlockDevicePath(c *gc.C, dev storage.BlockDevice, expect string) {
path, err := storage.BlockDevicePath(dev)
c.Assert(err, jc.ErrorIsNil)
c.Assert(path, jc.SamePath, expect)
}
func (s *BlockDevicePathSuite) TestBlockDevicePathError(c *gc.C) {
_, err := storage.BlockDevicePath(storage.BlockDevice{})
c.Assert(err, gc.ErrorMatches, `could not determine path for block device`)
}