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https://github.com/podman-container-tools/podman.git
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141eae99b8
Allowing for multiple manifest per artifact just makes the code and cli design harder to work with it. It is not clear how mounting, extracting or edit on a multi manifest artifact should have worked. A single manifest should make the code much easier to work with. Signed-off-by: Paul Holzinger <pholzing@redhat.com>
79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
package libartifact
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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"github.com/containers/image/v5/manifest"
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"github.com/opencontainers/go-digest"
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)
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type Artifact struct {
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// Manifest is the OCI manifest for the artifact with the name.
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// In a valid artifact the Manifest is guaranteed to not be nil.
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Manifest *manifest.OCI1
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Name string
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}
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// TotalSizeBytes returns the total bytes of the all the artifact layers
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func (a *Artifact) TotalSizeBytes() int64 {
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var s int64
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for _, layer := range a.Manifest.Layers {
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s += layer.Size
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}
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return s
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}
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// GetName returns the "name" or "image reference" of the artifact
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func (a *Artifact) GetName() (string, error) {
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if a.Name != "" {
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return a.Name, nil
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}
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// We don't have a concept of None for artifacts yet, but if we do,
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// then we should probably not error but return `None`
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return "", errors.New("artifact is unnamed")
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}
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// SetName is a accessor for setting the artifact name
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// Note: long term this may not be needed, and we would
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// be comfortable with simply using the exported field
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// called Name
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func (a *Artifact) SetName(name string) {
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a.Name = name
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}
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func (a *Artifact) GetDigest() (*digest.Digest, error) {
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b, err := json.Marshal(a.Manifest)
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if err != nil {
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return nil, err
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}
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artifactDigest := digest.FromBytes(b)
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return &artifactDigest, nil
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}
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type ArtifactList []*Artifact
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// GetByNameOrDigest returns an artifact, if present, by a given name
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// Returns an error if not found
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func (al ArtifactList) GetByNameOrDigest(nameOrDigest string) (*Artifact, bool, error) {
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// This is the hot route through
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for _, artifact := range al {
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if artifact.Name == nameOrDigest {
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return artifact, false, nil
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}
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}
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// Before giving up, check by digest
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for _, artifact := range al {
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artifactDigest, err := artifact.GetDigest()
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if err != nil {
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return nil, false, err
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}
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// If the artifact's digest matches or is a prefix of ...
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if artifactDigest.Encoded() == nameOrDigest || strings.HasPrefix(artifactDigest.Encoded(), nameOrDigest) {
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return artifact, true, nil
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}
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}
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return nil, false, fmt.Errorf("no artifact found with name or digest of %s", nameOrDigest)
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}
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