invocation

type EnvProvider interface {
	Environ() []string
	Getenv(key string) string
	Getwd() (string, error)
}

type ExecGit struct{}

type ExecVersions struct{}

type GitProvider interface {
	Root(cwd string) (string, error)
	Commit(cwd string) (string, error)
	Dirty(cwd string) (bool, error)
}

type OSEnv struct{}

type Options struct {
	Command        []string
	IncludeEnvVals bool
	Env            EnvProvider
	Git            GitProvider
	Versions       VersionProvider
	Now            time.Time
}

type VersionProvider interface {
	DockerVersion() (string, error)
	ComposeVersion() (string, error)
	DockerContext() (string, error)
}