add support for preserving the container on exit.

buildimage.go

@@ -21,6 +21,8 @@ type Builder struct {
 	srcDir  string
 	pkgDir  string
 
+	cleanContainer bool
+
 	containerID string
 }
 
@@ -62,9 +64,16 @@ func PreferredPackageDirectory(pkgDir string) MakeBuilderOption {
 	}
 }
 
+func RemoveContainer(remove bool) MakeBuilderOption {
+	return func(b *Builder) {
+		b.cleanContainer = remove
+	}
+}
+
 func MakeBuilder(opts ...MakeBuilderOption) (*Builder, error) {
 	b := new(Builder)
 	b.version = "latest"
+	b.cleanContainer = true
 	for _, opt := range opts {
 		opt(b)
 	}
@@ -184,6 +193,10 @@ func (b *Builder) deleteEnvironment() error {
 	if b.containerID == "" {
 		return nil
 	}
+	if !b.cleanContainer {
+		log.Println("preserved environment", b.containerID)
+		return nil
+	}
 	log.Println("deleting environment", b.containerID)
 	return b.cli.ContainerRemove(
 		b.ctx,

cmd/danos-buildimage/main.go

@@ -10,12 +10,14 @@ import (
 )
 
 var srcDir, destDir, pkgDir, version string
+var noClean bool
 
 func init() {
 	flag.StringVar(&srcDir, "src", "", "source directory")
 	flag.StringVar(&destDir, "dest", "..", "destination directory")
 	flag.StringVar(&pkgDir, "pkg", "", "preferred package directory")
 	flag.StringVar(&version, "version", "latest", "version of danos to build for")
+	flag.BoolVar(&noClean, "no-clean", false, "don't delete the container when done")
 }
 
 func resolvePath(in string) string {
@@ -36,6 +38,7 @@ func main() {
 		bimg.SourceDirectory(resolvePath(srcDir)),
 		bimg.DestinationDirectory(resolvePath(destDir)),
 		bimg.PreferredPackageDirectory(resolvePath(pkgDir)),
+		bimg.RemoveContainer(!noClean),
 		bimg.Version(version),
 	)
 	if err != nil {