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