12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455 |
- package hcsshim
- import (
- "syscall"
- "github.com/Sirupsen/logrus"
- )
- // GetLayerMountPath will look for a mounted layer with the given id and return
- // the path at which that layer can be accessed. This path may be a volume path
- // if the layer is a mounted read-write layer, otherwise it is expected to be the
- // folder path at which the layer is stored.
- func GetLayerMountPath(info DriverInfo, id string) (string, error) {
- title := "hcsshim::GetLayerMountPath "
- logrus.Debugf(title+"Flavour %d ID %s", info.Flavour, id)
- // Convert info to API calling convention
- infop, err := convertDriverInfo(info)
- if err != nil {
- logrus.Error(err)
- return "", err
- }
- var mountPathLength uintptr
- mountPathLength = 0
- // Call the procedure itself.
- logrus.Debugf("Calling proc (1)")
- err = getLayerMountPath(&infop, id, &mountPathLength, nil)
- if err != nil {
- err = makeErrorf(err, title, "(first call) id=%s flavour=%d", id, info.Flavour)
- logrus.Error(err)
- return "", err
- }
- // Allocate a mount path of the returned length.
- if mountPathLength == 0 {
- return "", nil
- }
- mountPathp := make([]uint16, mountPathLength)
- mountPathp[0] = 0
- // Call the procedure again
- logrus.Debugf("Calling proc (2)")
- err = getLayerMountPath(&infop, id, &mountPathLength, &mountPathp[0])
- if err != nil {
- err = makeErrorf(err, title, "(second call) id=%s flavour=%d", id, info.Flavour)
- logrus.Error(err)
- return "", err
- }
- path := syscall.UTF16ToString(mountPathp[0:])
- logrus.Debugf(title+"succeeded flavour=%d id=%s path=%s", info.Flavour, id, path)
- return path, nil
- }
|