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/docker/build.go

@@ -0,0 +1,80 @@
+/*
+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 docker
+
+import (
+	"bytes"
+	log "github.com/Sirupsen/logrus"
+	dockerlib "github.com/fsouza/go-dockerclient"
+	"github.com/kubernetes-incubator/kompose/pkg/utils/archive"
+	"github.com/pkg/errors"
+	"io/ioutil"
+	"os"
+	"path"
+	"strings"
+)
+
+type Build struct {
+	Client dockerlib.Client
+}
+
+/*
+Build a Docker image via the Docker API. Takes the source directory
+and image name and then builds the appropriate image. Tarball is utilized
+in order to make building easier.
+*/
+func (c *Build) BuildImage(source string, image string) error {
+
+	log.Infof("Building image '%s' from directory '%s'", image, path.Base(source))
+
+	// Create a temporary file for tarball image packaging
+	tmpFile, err := ioutil.TempFile("/tmp", "kompose-image-build-")
+	if err != nil {
+		return err
+	}
+	log.Debugf("Created temporary file %v for Docker image tarballing", tmpFile.Name())
+
+	// Create a tarball of the source directory in order to build the resulting image
+	err = archive.CreateTarball(strings.Join([]string{source, ""}, "/"), tmpFile.Name())
+	if err != nil {
+		return errors.Wrap(err, "Unable to create a tarball")
+	}
+
+	// Load the file into memory
+	tarballSource, err := os.Open(tmpFile.Name())
+	if err != nil {
+		return errors.Wrap(err, "Unable to load tarball into memory")
+	}
+
+	// Let's create all the options for the image building.
+	outputBuffer := bytes.NewBuffer(nil)
+	opts := dockerlib.BuildImageOptions{
+		Name:         image,
+		InputStream:  tarballSource,
+		OutputStream: outputBuffer,
+	}
+
+	// Build it!
+	if err := c.Client.BuildImage(opts); err != nil {
+		return errors.Wrap(err, "Unable to build image. For more output, use -v or --verbose when converting.")
+	}
+
+	log.Infof("Image '%s' from directory '%s' built successfully", image, path.Base(source))
+	log.Debugf("Image %s build output:\n%s", image, outputBuffer)
+
+	return nil
+}

pkg/utils/docker/client.go

@@ -0,0 +1,36 @@
+/*
+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 docker
+
+import (
+	"github.com/fsouza/go-dockerclient"
+)
+
+func DockerClient() (*docker.Client, error) {
+
+	// Default end-point, HTTP + TLS support to be added in the future
+	// Eventually functionality to specify end-point added to command-line
+	endpoint := "unix:///var/run/docker.sock"
+
+	// Use the unix socker end-point. No support for TLS (yet)
+	client, err := docker.NewClient(endpoint)
+	if err != nil {
+		return client, err
+	}
+
+	return client, nil
+}

pkg/utils/docker/push.go

@@ -0,0 +1,84 @@
+/*
+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 docker
+
+import (
+	"bytes"
+	log "github.com/Sirupsen/logrus"
+	dockerlib "github.com/fsouza/go-dockerclient"
+	"github.com/novln/docker-parser"
+	"github.com/pkg/errors"
+)
+
+type Push struct {
+	Client dockerlib.Client
+}
+
+/*
+Push a Docker image via the Docker API. Takes the image name,
+parses the URL details and then push based on environment authentication
+credentials.
+*/
+func (c *Push) PushImage(fullImageName string) error {
+	outputBuffer := bytes.NewBuffer(nil)
+
+	// Using https://github.com/novln/docker-parser in order to parse the appropriate
+	// name and registry.
+	parsedImage, err := dockerparser.Parse(fullImageName)
+	if err != nil {
+		return err
+	}
+	image, registry := parsedImage.Name(), parsedImage.Registry()
+
+	log.Infof("Pushing image '%s' to registry '%s'", image, registry)
+
+	// Let's setup the push and authentication options
+	options := dockerlib.PushImageOptions{
+		Name:         parsedImage.Name(),
+		Registry:     parsedImage.Registry(),
+		OutputStream: outputBuffer,
+	}
+
+	// Retrieve the authentication configuration file
+	// Files checked as per https://godoc.org/github.com/fsouza/go-dockerclient#NewAuthConfigurationsFromFile
+	// $DOCKER_CONFIG/config.json, $HOME/.docker/config.json , $HOME/.dockercfg
+	credentials, err := dockerlib.NewAuthConfigurationsFromDockerCfg()
+	if err != nil {
+		return errors.Wrap(err, "Unable to retrieve .docker/config.json authentication details. Check that 'docker login' works successfully on the command line.")
+	}
+
+	// Push the image to the repository (based on the URL)
+	// We will iterate through all available authentication configurations until we find one that pushes successfully
+	// and then return nil.
+	if len(credentials.Configs) > 1 {
+		log.Info("Multiple authentication credentials detected. Will try each configuration.")
+	}
+
+	for k, v := range credentials.Configs {
+		log.Infof("Attempting authentication credentials '%s", k)
+		err = c.Client.PushImage(options, v)
+		if err != nil {
+			log.Errorf("Unable to push image '%s' to registry '%s'. Error: %s", image, registry, err)
+		} else {
+			log.Debugf("Image '%s' push output:\n%s", image, outputBuffer)
+			log.Infof("Successfully pushed image '%s' to registry '%s'", image, registry)
+			return nil
+		}
+	}
+
+	return errors.New("Unable to push docker image(s). Check that `docker login` works successfully on the command line.")
+}