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buildkit: add support for custom build output with --output

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Allows end-users to export final build content or rootfs to external formats.

By default, a local container image is created from the build result. The --output (or -o) flag allows you to override this behavior, and a specify a custom exporter. For example, custom exporters allow you to export the build artifacts as files on the local filesystem instead of a Container image, which can be useful for generating local binaries, code generation etc.

The value for --output is a CSV-formatted string defining the exporter type and options. Currently, local and tar exporters are supported. The local exporter writes the resulting build files to a directory on the client side. The tar exporter is similar but writes the files as a single tarball (.tar).

```console
buildah build --output type=local,dest=dir .
buildah build --output type=tar,dest=rootfs.tar .
buildah build -o dir .
```
Reference: https://docs.docker.com/engine/reference/commandline/build/#custom-build-outputs

Signed-off-by: Aditya R <arajan@redhat.com>
This commit is contained in:
Aditya R
2022-04-29 19:09:42 +05:30
parent 3408e25b4f
commit d0336f2147
12 changed files with 316 additions and 6 deletions
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3
commit.go
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@ -229,6 +229,7 @@ func (b *Builder) addManifest(ctx context.Context, manifestName string, imageSpe
func (b *Builder) Commit(ctx context.Context, dest types.ImageReference, options CommitOptions) (string, reference.Canonical, digest.Digest, error) {
var (
imgID string
src types.ImageReference
)
// If we weren't given a name, build a destination reference using a
@ -300,7 +301,7 @@ func (b *Builder) Commit(ctx context.Context, dest types.ImageReference, options
logrus.Debugf("committing image with reference %q is allowed by policy", transports.ImageName(dest))
// Build an image reference from which we can copy the finished image.
src, err := b.makeImageRef(options)
src, err = b.makeContainerImageRef(options)
if err != nil {
return imgID, nil, "", errors.Wrapf(err, "error computing layer digests and building metadata for container %q", b.ContainerID)
}