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strategies.go
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/
strategies.go
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package strategies
import (
dockerclient "github.com/fsouza/go-dockerclient"
"github.com/openshift/source-to-image/pkg/api"
"github.com/openshift/source-to-image/pkg/build"
"github.com/openshift/source-to-image/pkg/build/strategies/onbuild"
"github.com/openshift/source-to-image/pkg/build/strategies/sti"
"github.com/openshift/source-to-image/pkg/docker"
)
// GetStrategy decides what build strategy will be used for the STI build.
func GetStrategy(config *api.Config) (build.Builder, error) {
image, err := GetBuilderImage(config)
if err != nil {
return nil, err
}
if image.OnBuild {
return onbuild.New(config)
}
return sti.New(config)
}
// GetBuilderImage processes the config and performs operations necessary to make
// the Docker image specified as BuilderImage available locally.
// It returns information about the base image, containing metadata necessary
// for choosing the right STI build strategy.
func GetBuilderImage(config *api.Config) (*docker.PullResult, error) {
d, err := docker.New(config.DockerConfig, config.PullAuthentication)
result := docker.PullResult{}
if err != nil {
return nil, err
}
var image *dockerclient.Image
if config.ForcePull {
image, err = d.PullImage(config.BuilderImage)
} else {
image, err = d.CheckAndPull(config.BuilderImage)
}
if err != nil {
return nil, err
}
result.Image = image
result.OnBuild = d.IsImageOnBuild(config.BuilderImage)
return &result, nil
}