First working cut

main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "tarpoon",
+	Short: "Build Docker images",
+	Long:  "`docker build && docker push` without the `docker`. Push a tarball to a registry for distribution",
+	Run:   rootRun,
+}
+
+var (
+	baseImage string
+	workDir   string
+	exec      []string
+)
+
+func init() {
+	rootCmd.PersistentFlags().StringVarP(&baseImage, "base-image", "b", "scratch", "Base image to append the tar to")
+	rootCmd.PersistentFlags().StringVarP(&workDir, "workdir", "w", "/", "Working directory of the new container")
+	rootCmd.PersistentFlags().StringSliceVarP(&exec, "exec", "e", []string{"/bin/sh", "-c"}, "What to exec in the newly built container")
+}
+
+func main() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(-1)
+	}
+}
+
+func rootRun(cmd *cobra.Command, args []string) {
+	if len(args) < 2 {
+		fmt.Println("tarpoon TARFILE DOCKER_PATH")
+		os.Exit(1)
+	}
+	fmt.Printf("** Creating build dir\n")
+	dir, err := NewBuildDir()
+	defer dir.Close()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	fmt.Printf("** Build dir is %s\n", dir.dir)
+	fmt.Printf("** Loading base image %s\n", baseImage)
+	err = dir.LoadBase(baseImage)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	fmt.Printf("** Applying tarball %s\n", args[0])
+	err = dir.AddTarLayer(args[0])
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	fmt.Printf("** Preparing image\n")
+	err = dir.DumpImageConfig()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	err = dir.WriteManifest()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	fmt.Printf("** Pushing image\n")
+	err = dir.Push(args[1])
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+}