Adds both build and push support

This adds support for building and pushing docker containers
when you perform either `kompose convert` or `kompose up`.

Docker Compose files who have build parameters with their respective
image and build keys will automatically be both built and pushed.

pkg/utils/archive/tar.go

@@ -0,0 +1,90 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package archive
+
+import (
+	"archive/tar"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+/*
+CreateTarball creates a tarball for source and dumps it to target path
+
+Function modified and added from https://github.com/mholt/archiver/blob/master/tar.go
+*/
+func CreateTarball(source, target string) error {
+	tarfile, err := os.Create(target)
+	if err != nil {
+		return err
+	}
+	defer tarfile.Close()
+
+	tarball := tar.NewWriter(tarfile)
+	defer tarball.Close()
+
+	info, err := os.Stat(source)
+	if err != nil {
+		return nil
+	}
+
+	var baseDir string
+	if info.IsDir() {
+		baseDir = filepath.Base(source)
+	}
+
+	return filepath.Walk(source,
+		func(path string, info os.FileInfo, err error) error {
+			if baseDir == path {
+				return nil
+			}
+			if err != nil {
+				return err
+			}
+			header, err := tar.FileInfoHeader(info, info.Name())
+			if err != nil {
+				return err
+			}
+
+			if baseDir != "" {
+				if strings.HasSuffix(source, "/") {
+					header.Name = strings.TrimPrefix(path, source)
+				} else {
+					header.Name = filepath.Join(baseDir, strings.TrimPrefix(path, source))
+				}
+				//println("Header name", header.Name)
+			}
+
+			if err := tarball.WriteHeader(header); err != nil {
+				return err
+			}
+
+			if info.IsDir() {
+				return nil
+			}
+
+			file, err := os.Open(path)
+			if err != nil {
+				return err
+			}
+			defer file.Close()
+			_, err = io.Copy(tarball, file)
+			return err
+		})
+}