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Deprecation: change --stream error to a warning, and update deprecated.md #2809

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Oct 26, 2020
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Deprecation: change --stream error to a warning, and update deprecated.md #2809

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a40beed
builder: print deprecation warning instead of failing for --stream
thaJeztah Oct 23, 2020
7150736
Deprecation: add experimental docker build --stream option
thaJeztah Oct 23, 2020
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6 changes: 5 additions & 1 deletion cli/command/image/build.go
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Expand Up @@ -246,7 +246,11 @@ func runBuild(dockerCli command.Cli, options buildOptions) error {
)

if options.stream {
return errors.New("Experimental flag --stream was removed, enable BuildKit instead with DOCKER_BUILDKIT=1")
_, _ = fmt.Fprint(dockerCli.Err(), `DEPRECATED: The experimental --stream flag has been removed and the build context
will be sent non-streaming. Enable BuildKit instead with DOCKER_BUILDKIT=1
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"Consider using BuildKit instead", maybe with a doc link?

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Good suggestion; I recently added docker/docs#11460, and this would be a good candidate for that. Need to check if we have a good location already to point users to (on how to enable buildkit).

can then add a URL like https://docs.docker.com/go/buildkit

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Opened docker/docs#11621 to implement https://docs.docker.com/go/buildkit/ as a redirect

to stream build context, see https://docs.docker.com/go/buildkit/

`)
}

if options.dockerfileFromStdin() {
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18 changes: 18 additions & 0 deletions docs/deprecated.md
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Expand Up @@ -56,6 +56,7 @@ Deprecated | [Classic Swarm and overlay networks using external key/value stores
Deprecated | [Support for the legacy `~/.dockercfg` configuration file for authentication](#support-for-legacy-dockercfg-configuration-files) | v20.10 | -
Deprecated | [CLI plugins support](#cli-plugins-support) | v20.10 | -
Deprecated | [Dockerfile legacy `ENV name value` syntax](#dockerfile-legacy-env-name-value-syntax) | v20.10 | -
Removed | [`docker build --stream` flag (experimental)](#docker-build---stream-flag-experimental) | v20.10 | v20.10
Deprecated | [Configuration options for experimental CLI features](#configuration-options-for-experimental-cli-features) | v19.03 | v20.10
Deprecated | [Pushing and pulling with image manifest v2 schema 1](#pushing-and-pulling-with-image-manifest-v2-schema-1) | v19.03 | v20.10
Removed | [`docker engine` subcommands](#docker-engine-subcommands) | v19.03 | v20.10
Expand Down Expand Up @@ -174,6 +175,23 @@ syntax, for example:
ENV ONE="" TWO="" THREE="world"
```

### `docker build --stream` flag (experimental)

**Deprecated in Release: v20.10**
**Removed in Release: v20.10**

Docker v17.07 introduced an experimental `--stream` flag on `docker build` which
allowed the build-context to be incrementally sent to the daemon, instead of
unconditionally sending the whole build-context.

This functionality has been reimplemented as part of BuildKit, which uses streaming
by default and the `--stream` option will be ignored when using the classic builder,
printing a deprecation warning instead.

Users that want to use this feature are encouraged to enable BuildKit by setting
the `DOCKER_BUILDKIT=1` environment variable or through the daemon or CLI configuration
files.

### Pushing and pulling with image manifest v2 schema 1

**Deprecated in Release: v19.03**
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