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d45a26d7e2
Previously, Windows only supported running with a OS-managed base image. With this change, Windows supports normal, Linux-like layered images, too. Signed-off-by: John Starks <jostarks@microsoft.com>
48 lines
1.5 KiB
Go
48 lines
1.5 KiB
Go
// +build windows
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package image
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import (
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"crypto/sha512"
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"fmt"
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"github.com/docker/distribution/digest"
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"github.com/docker/docker/layer"
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)
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// TypeLayersWithBase is used for RootFS.Type for Windows filesystems that have layers and a centrally-stored base layer.
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const TypeLayersWithBase = "layers+base"
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// RootFS describes images root filesystem
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// This is currently a placeholder that only supports layers. In the future
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// this can be made into an interface that supports different implementations.
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type RootFS struct {
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Type string `json:"type"`
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DiffIDs []layer.DiffID `json:"diff_ids,omitempty"`
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BaseLayer string `json:"base_layer,omitempty"`
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}
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// BaseLayerID returns the 64 byte hex ID for the baselayer name.
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func (r *RootFS) BaseLayerID() string {
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if r.Type != TypeLayersWithBase {
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panic("tried to get base layer ID without a base layer")
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}
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baseID := sha512.Sum384([]byte(r.BaseLayer))
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return fmt.Sprintf("%x", baseID[:32])
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}
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// ChainID returns the ChainID for the top layer in RootFS.
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func (r *RootFS) ChainID() layer.ChainID {
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ids := r.DiffIDs
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if r.Type == TypeLayersWithBase {
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// Add an extra ID for the base.
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baseDiffID := layer.DiffID(digest.FromBytes([]byte(r.BaseLayerID())))
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ids = append([]layer.DiffID{baseDiffID}, ids...)
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}
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return layer.CreateChainID(ids)
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}
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// NewRootFSWithBaseLayer returns a RootFS struct with a base layer
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func NewRootFSWithBaseLayer(baseLayer string) *RootFS {
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return &RootFS{Type: TypeLayersWithBase, BaseLayer: baseLayer}
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}
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