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37 lines
1.1 KiB
Go
37 lines
1.1 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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// 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 a 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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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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baseDiffID, _ := digest.FromBytes([]byte(r.BaseLayerID())) // can never error
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return layer.CreateChainID(append([]layer.DiffID{layer.DiffID(baseDiffID)}, r.DiffIDs...))
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}
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// NewRootFS returns empty RootFS struct
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func NewRootFS() *RootFS {
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return &RootFS{Type: "layers+base"}
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}
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