Implement docker build

Author: FabianKramm

Gopkg.lock

@@ -15,6 +15,10 @@
   source = "https://github.com/moby/moby"
   revision = "ae7016427f8cba4e4d8fcb979d6ba313ee2c0702"
 
+[[constraint]]
+  name = "github.com/docker/cli"
+  version = "v18.06.1-ce"
+
 [[constraint]]
   name = "github.com/rhysd/go-github-selfupdate"
   revision = "41c1bbb0804a2994dae69502a8c76e7c456ad45e"

Gopkg.toml

@@ -0,0 +1,104 @@
+package docker
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"github.com/docker/docker/api"
+	"github.com/docker/docker/client"
+	"github.com/docker/go-connections/tlsconfig"
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+func newDockerClientFromEnvironment() (client.CommonAPIClient, error) {
+	cli, err := client.NewClientWithOpts(client.FromEnv)
+	if err != nil {
+		return nil, fmt.Errorf("Error getting docker client: %s", err)
+	}
+
+	cli.NegotiateAPIVersion(context.Background())
+	return cli, nil
+}
+
+func newDockerClientFromMinikube() (client.CommonAPIClient, error) {
+	env, err := getMinikubeEnvironment()
+	if err != nil {
+		return nil, err
+	}
+
+	var httpclient *http.Client
+	if dockerCertPath := env["DOCKER_CERT_PATH"]; dockerCertPath != "" {
+		options := tlsconfig.Options{
+			CAFile:             filepath.Join(dockerCertPath, "ca.pem"),
+			CertFile:           filepath.Join(dockerCertPath, "cert.pem"),
+			KeyFile:            filepath.Join(dockerCertPath, "key.pem"),
+			InsecureSkipVerify: env["DOCKER_TLS_VERIFY"] == "",
+		}
+		tlsc, err := tlsconfig.Client(options)
+		if err != nil {
+			return nil, err
+		}
+
+		httpclient = &http.Client{
+			Transport: &http.Transport{
+				TLSClientConfig: tlsc,
+			},
+			CheckRedirect: client.CheckRedirect,
+		}
+	}
+
+	host := env["DOCKER_HOST"]
+	if host == "" {
+		host = client.DefaultDockerHost
+	}
+	version := env["DOCKER_API_VERSION"]
+	if version == "" {
+		version = api.DefaultVersion
+	}
+
+	return client.NewClient(host, version, httpclient, nil)
+}
+
+func isMinikube() bool {
+	if isMinikubeVar == nil {
+		loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
+		kubeConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
+		cfg, err := kubeConfig.RawConfig()
+
+		if err != nil {
+			return false
+		}
+
+		isMinikube := cfg.CurrentContext == "minikube"
+		isMinikubeVar = &isMinikube
+	}
+
+	return *isMinikubeVar
+}
+
+func getMinikubeEnvironment() (map[string]string, error) {
+	cmd := exec.Command("minikube", "docker-env", "--shell", "none")
+	out, err := cmd.Output()
+
+	if err != nil {
+		return nil, err
+	}
+
+	env := map[string]string{}
+
+	for _, line := range strings.Split(string(out), "\n") {
+		envKeyValue := strings.Split(line, "=")
+
+		if len(envKeyValue) != 2 {
+			continue
+		}
+
+		env[envKeyValue[0]] = envKeyValue[1]
+	}
+
+	return env, nil
+}