diff options
Diffstat (limited to 'vendor/github.com/Microsoft/hcsshim/internal/wclayer/layerutils.go')
-rw-r--r-- | vendor/github.com/Microsoft/hcsshim/internal/wclayer/layerutils.go | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/vendor/github.com/Microsoft/hcsshim/internal/wclayer/layerutils.go b/vendor/github.com/Microsoft/hcsshim/internal/wclayer/layerutils.go new file mode 100644 index 000000000..a1b8b9882 --- /dev/null +++ b/vendor/github.com/Microsoft/hcsshim/internal/wclayer/layerutils.go @@ -0,0 +1,96 @@ +package wclayer + +// This file contains utility functions to support storage (graph) related +// functionality. + +import ( + "syscall" + + "github.com/Microsoft/hcsshim/internal/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.Debugf("Failed to convert name to guid %s", err) + return nil, err + } + + p, err := syscall.UTF16PtrFromString(parentLayerPaths[i]) + if err != nil { + logrus.Debugf("Failed conversion of parentLayerPath to pointer %s", err) + return nil, err + } + + layers = append(layers, WC_LAYER_DESCRIPTOR{ + LayerId: g, + Flags: 0, + Pathp: p, + }) + } + + return layers, nil +} |