60607af26c
Add a new `Resolve` method to `Client` that will resolve its `Target`
to the corresponding manifest digest id and its corresponding iamge
identifier. The former can be used in the URL to fetch a specific
image from the registry via `<name>@<digest>` and the latter uniquely
identifies a container image via the hash of its configuration object.
This should stay the same across pulls and is also the id returned via
`podman pull` and `podman images`.
Since (most) container images are OS and architecture specific a tag
often points to a manifest list that contains all available options.
Therefore the resolve operation needs to choose the correct arch for
image. A new pair of getters `Set{Architecture,Variant}Choice` lets
the user control which architecture/variant is selected during the
resolution process.
33 lines
1 KiB
Go
33 lines
1 KiB
Go
package container
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import (
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"github.com/containers/image/v5/docker/reference"
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"github.com/opencontainers/go-digest"
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)
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// A Spec is the specification of how to get a specific
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// container from a Source and under what LocalName to
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// store it in an image. The container is identified by
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// at the Source via Digest and ImageID. The latter one
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// should remain the same in the target image as well.
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type Spec struct {
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Source string // does not include the manifest digest
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Digest string // digest of the manifest at the Source
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TLSVerify *bool // controls TLS verification
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ImageID string // container image identifier
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LocalName string // name to use inside the image
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}
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// NewSpec creates a new Spec from the essential information.
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// It also converts is the transition point from container
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// specific types (digest.Digest) to generic types (string).
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func NewSpec(source reference.Named, digest, imageID digest.Digest) Spec {
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name := source.Name()
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return Spec{
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Source: name,
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Digest: digest.String(),
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ImageID: imageID.String(),
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LocalName: name,
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}
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}
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