package wclayer // This file contains utility functions to support storage (graph) related // functionality. import ( "syscall" "github.com/Microsoft/go-winio/pkg/guid" "github.com/sirupsen/logrus" ) /* To pass into syscall, we need a struct matching the following: enum GraphDriverType { DiffDriver, FilterDriver }; struct DriverInfo { GraphDriverType Flavour; LPCWSTR HomeDir; }; */ type driverInfo struct { Flavour int HomeDirp *uint16 } var ( utf16EmptyString uint16 stdDriverInfo = driverInfo{1, &utf16EmptyString} ) /* To pass into syscall, we need a struct matching the following: typedef struct _WC_LAYER_DESCRIPTOR { // // The ID of the layer // GUID LayerId; // // Additional flags // union { struct { ULONG Reserved : 31; ULONG Dirty : 1; // Created from sandbox as a result of snapshot }; ULONG Value; } Flags; // // Path to the layer root directory, null-terminated // PCWSTR Path; } WC_LAYER_DESCRIPTOR, *PWC_LAYER_DESCRIPTOR; */ type WC_LAYER_DESCRIPTOR struct { LayerId guid.GUID Flags uint32 Pathp *uint16 } func layerPathsToDescriptors(parentLayerPaths []string) ([]WC_LAYER_DESCRIPTOR, error) { // Array of descriptors that gets constructed. var layers []WC_LAYER_DESCRIPTOR for i := 0; i < len(parentLayerPaths); i++ { g, err := LayerID(parentLayerPaths[i]) if err != nil { logrus.WithError(err).Debug("Failed to convert name to guid") return nil, err } p, err := syscall.UTF16PtrFromString(parentLayerPaths[i]) if err != nil { logrus.WithError(err).Debug("Failed conversion of parentLayerPath to pointer") return nil, err } layers = append(layers, WC_LAYER_DESCRIPTOR{ LayerId: g, Flags: 0, Pathp: p, }) } return layers, nil }