1 files changed, 55 insertions, 0 deletions
diff --git a/vendor/github.com/Microsoft/hcsshim/getlayermountpath.go b/vendor/github.com/Microsoft/hcsshim/getlayermountpath.go
new file mode 100644
index 000000000..89f8079d0
--- /dev/null
+++ b/vendor/github.com/Microsoft/hcsshim/getlayermountpath.go
@@ -0,0 +1,55 @@
+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
+}