initial commit [ci skip]

engine/engine.go

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+// Copyright 2019 Drone.IO Inc. All rights reserved.
+// Use of this source code is governed by the Polyform License
+// that can be found in the LICENSE file.
+
+package engine
+
+import (
+	"context"
+	"io"
+)
+
+// Engine is the interface that must be implemented by a
+// pipeline execution engine.
+type Engine interface {
+	// Setup the pipeline environment.
+	Setup(context.Context, *Spec) error
+
+	// Destroy the pipeline environment.
+	Destroy(context.Context, *Spec) error
+
+	// Run runs the pipeine step.
+	Run(context.Context, *Spec, *Step, io.Writer) (*State, error)
+}