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container: ability to resolve containers to specs

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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.
This commit is contained in:
Christian Kellner 2022-07-20 21:18:30 +02:00 • committed by Ondřej Budai
parent bd42243882
commit 60607af26c
4 changed files with 233 additions and 0 deletions
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vendor/modules.txt vendored
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@ -436,6 +436,7 @@ github.com/modern-go/reflect2
## explicit
github.com/opencontainers/go-digest
# github.com/opencontainers/image-spec v1.0.3-0.20211202193544-a5463b7f9c84
## explicit
github.com/opencontainers/image-spec/specs-go
github.com/opencontainers/image-spec/specs-go/v1
# github.com/opencontainers/runc v1.1.1