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52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
package image
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import (
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"runtime"
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"github.com/docker/docker/layer"
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"github.com/sirupsen/logrus"
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)
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// TypeLayers is used for RootFS.Type for filesystems organized into layers.
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const TypeLayers = "layers"
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// typeLayersWithBase is an older format used by Windows up to v1.12. We
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// explicitly handle this as an error case to ensure that a daemon which still
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// has an older image like this on disk can still start, even though the
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// image itself is not usable. See https://github.com/docker/docker/pull/25806.
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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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}
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// NewRootFS returns empty RootFS struct
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func NewRootFS() *RootFS {
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return &RootFS{Type: TypeLayers}
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}
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// Append appends a new diffID to rootfs
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func (r *RootFS) Append(id layer.DiffID) {
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r.DiffIDs = append(r.DiffIDs, id)
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}
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// Clone returns a copy of the RootFS
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func (r *RootFS) Clone() *RootFS {
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newRoot := NewRootFS()
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newRoot.Type = r.Type
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newRoot.DiffIDs = append(r.DiffIDs)
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return newRoot
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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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if runtime.GOOS == "windows" && r.Type == typeLayersWithBase {
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logrus.Warnf("Layer type is unsupported on this platform. DiffIDs: '%v'", r.DiffIDs)
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return ""
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}
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return layer.CreateChainID(r.DiffIDs)
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}
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