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The image store abstracts image handling. It keeps track of the available images, and makes it possible to delete existing images or register new ones. The image store holds references to the underlying layers for each image. The image/v1 package provides compatibility functions for interoperating with older (non-content-addressable) image structures. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
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 implementaions.
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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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