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Disable the support for Schema 1 images

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Schema 1 (`application/vnd.docker.distribution.manifest.v1+prettyjws`) has been
officially deprecated since containerd v1.7 (PR 6884).

We have planned to remove the support for Schema 1 in containerd v2.0, but this
removal may still surprise some users.
So, in containerd v2.0 we will just disable it by default.

The support for Schema 1 can be still enabled by setting an environment variable
`CONTAINERD_ENABLE_DEPRECATED_PULL_SCHEMA_1_IMAGE=1`, however, this workaround
will be completely removed in containerd v2.1.

Schema 2 was introduced in Docker 1.10 (Feb 2016), so most users should
have been already using Schema 2 or OCI.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
This commit is contained in:
Akihiro Suda
2024-02-13 00:38:50 +09:00
parent f1a3c3705f
commit 99721c27e1
7 changed files with 49 additions and 15 deletions
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7
pkg/deprecation/deprecation.go
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@@ -33,8 +33,13 @@ const (
CRIRegistryConfigs Warning = Prefix + "cri-registry-configs"
)
const (
EnvPrefix = "CONTAINERD_ENABLE_DEPRECATED_"
EnvPullSchema1Image = EnvPrefix + "PULL_SCHEMA_1_IMAGE"
)
var messages = map[Warning]string{
PullSchema1Image: "Schema 1 images are deprecated since containerd v1.7 and removed in containerd v2.0. " +
PullSchema1Image: "Schema 1 images are deprecated since containerd v1.7, disabled in containerd v2.0, and will be removed in containerd v2.1. " +
`Since containerd v1.7.8, schema 1 images are identified by the "io.containerd.image/converted-docker-schema1" label.`,
GoPluginLibrary: "Dynamically-linked Go plugins as containerd runtimes are deprecated since containerd v2.0 and removed in containerd v2.1.",
CRIRegistryMirrors: "The `mirrors` property of `[plugins.\"io.containerd.grpc.v1.cri\".registry]` is deprecated since containerd v1.5 and will be removed in containerd v2.0." +