convert / build: add networking support through network-manager flag

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

builder_test.go

@@ -27,7 +27,7 @@ func testSysconfig(t *testing.T, ctx context.Context, img, sysconf, kernel, init
 	sys, err := sysconfig(r)
 	require.NoError(t, err)
 	assert.Equal(t, sysconf, sys)
-	d, err := NewDockerfile(r, img, "root")
+	d, err := NewDockerfile(r, img, "root", "")
 	require.NoError(t, err)
 	logrus.Infof("docker image based on %s", d.Release.Name)
 	p := filepath.Join(tmpPath, docker.FormatImgName(img))
@@ -75,12 +75,6 @@ func TestSyslinuxCfg(t *testing.T) {
 			initrd:    "/boot/initrd.img",
 			sysconfig: syslinuxCfgUbuntu,
 		},
-		{
-			image:     "debian:8",
-			kernel:    "/vmlinuz",
-			initrd:    "/initrd.img",
-			sysconfig: syslinuxCfgDebian,
-		},
 		{
 			image:     "debian:9",
 			kernel:    "/vmlinuz",

cmd/d2vm/build.go

@@ -32,6 +32,7 @@ import (
 var (
 	file           = "Dockerfile"
 	tag            = uuid.New().String()
+	networkManager string
 	buildArgs      []string
 	buildCmd       = &cobra.Command{
 		Use:   "build [context directory]",
@@ -54,7 +55,7 @@ var (
 			if err := docker.Build(cmd.Context(), tag, file, args[0], buildArgs...); err != nil {
 				return err
 			}
-			return d2vm.Convert(cmd.Context(), tag, size, password, output, cmdLineExtra)
+			return d2vm.Convert(cmd.Context(), tag, size, password, output, cmdLineExtra, d2vm.NetworkManager(networkManager))
 		},
 	}
 )
@@ -71,4 +72,5 @@ func init() {
 	buildCmd.Flags().BoolVarP(&debug, "debug", "d", false, "Enable Debug output")
 	buildCmd.Flags().BoolVar(&force, "force", false, "Override output image")
 	buildCmd.Flags().StringVar(&cmdLineExtra, "append-to-cmdline", "", "Extra kernel cmdline arguments to append to the generated one")
+	buildCmd.Flags().StringVar(&networkManager, "network-manager", "", "Network manager to use for the image: none, netplan, ifupdown")
 }

cmd/d2vm/convert.go

@@ -79,7 +79,7 @@ var (
 					return err
 				}
 			}
-			return d2vm.Convert(cmd.Context(), img, size, password, output, cmdLineExtra)
+			return d2vm.Convert(cmd.Context(), img, size, password, output, cmdLineExtra, d2vm.NetworkManager(networkManager))
 		},
 	}
 )
@@ -100,5 +100,6 @@ func init() {
 	convertCmd.Flags().BoolVarP(&debug, "debug", "d", false, "Enable Debug output")
 	convertCmd.Flags().BoolVarP(&force, "force", "f", false, "Override output qcow2 image")
 	convertCmd.Flags().StringVar(&cmdLineExtra, "append-to-cmdline", "", "Extra kernel cmdline arguments to append to the generated one")
+	convertCmd.Flags().StringVar(&networkManager, "network-manager", "", "Network manager to use for the image: none, netplan, ifupdown")
 	rootCmd.AddCommand(convertCmd)
 }

convert.go

@@ -28,7 +28,7 @@ import (
 	"go.linka.cloud/d2vm/pkg/docker"
 )
 
-func Convert(ctx context.Context, img string, size int64, password string, output string, cmdLineExtra string) error {
+func Convert(ctx context.Context, img string, size int64, password string, output string, cmdLineExtra string, networkManager NetworkManager) error {
 	imgUUID := uuid.New().String()
 	tmpPath := filepath.Join(os.TempDir(), "d2vm", imgUUID)
 	if err := os.MkdirAll(tmpPath, os.ModePerm); err != nil {
@@ -41,7 +41,7 @@ func Convert(ctx context.Context, img string, size int64, password string, outpu
 	if err != nil {
 		return err
 	}
-	d, err := NewDockerfile(r, img, password)
+	d, err := NewDockerfile(r, img, password, networkManager)
 	if err != nil {
 		return err
 	}

dockerfile.go

@@ -19,6 +19,8 @@ import (
 	"fmt"
 	"io"
 	"text/template"
+
+	"github.com/sirupsen/logrus"
 )
 
 //go:embed templates/ubuntu.Dockerfile
@@ -40,10 +42,19 @@ var (
 	centOSDockerfileTemplate = template.Must(template.New("centos.Dockerfile").Parse(centOSDockerfile))
 )
 
+type NetworkManager string
+
+const (
+	NetworkManagerNone      NetworkManager = "none"
+	NetworkManagerIfupdown2 NetworkManager = "ifupdown"
+	NetworkManagerNetplan   NetworkManager = "netplan"
+)
+
 type Dockerfile struct {
 	Image          string
 	Password       string
 	Release        OSRelease
+	NetworkManager NetworkManager
 	tmpl           *template.Template
 }
 
@@ -51,22 +62,30 @@ func (d Dockerfile) Render(w io.Writer) error {
 	return d.tmpl.Execute(w, d)
 }
 
-func NewDockerfile(release OSRelease, img, password string) (Dockerfile, error) {
+func NewDockerfile(release OSRelease, img, password string, networkManager NetworkManager) (Dockerfile, error) {
 	if password == "" {
 		password = "root"
 	}
-	d := Dockerfile{Release: release, Image: img, Password: password}
+	d := Dockerfile{Release: release, Image: img, Password: password, NetworkManager: networkManager}
+	var net NetworkManager
 	switch release.ID {
 	case ReleaseDebian:
 		d.tmpl = debianDockerfileTemplate
+		net = NetworkManagerIfupdown2
 	case ReleaseUbuntu:
 		d.tmpl = ubuntuDockerfileTemplate
+		net = NetworkManagerNetplan
 	case ReleaseAlpine:
 		d.tmpl = alpineDockerfileTemplate
+		net = NetworkManagerIfupdown2
 	case ReleaseCentOS:
 		d.tmpl = centOSDockerfileTemplate
 	default:
 		return Dockerfile{}, fmt.Errorf("unsupported distribution: %s", release.ID)
 	}
+	if d.NetworkManager == "" {
+		logrus.Warnf("no network manager specified, using distribution defaults: %s", net)
+		d.NetworkManager = net
+	}
 	return d, nil
 }

templates/alpine.Dockerfile

@@ -21,3 +21,11 @@ RUN for s in devfs dmesg hwdrivers mdev; do rc-update add $s sysinit; done
 
 RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd
 
+{{ if eq .NetworkManager "ifupdown"}}
+RUN apk add --no-cache ifupdown-ng
+RUN mkdir -p /etc/network && printf '\
+auto eth0\n\
+allow-hotplug eth0\n\
+iface eth0 inet dhcp\n\
+' > /etc/network/interfaces
+{{ end }}

templates/debian.Dockerfile

@@ -17,3 +17,26 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
 RUN systemctl preset-all
 
 RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd
+
+{{ if eq .NetworkManager "netplan" }}
+RUN apt install -y netplan.io
+RUN mkdir -p /etc/netplan && printf '\
+network:\n\
+  version: 2\n\
+  renderer: networkd\n\
+  ethernets:\n\
+    eth0:\n\
+      dhcp4: true\n\
+      nameservers:\n\
+        addresses:\n\
+        - 8.8.8.8\n\
+        - 8.8.4.4\n\
+' > /etc/netplan/00-netcfg.yaml \
+{{ else if eq .NetworkManager "ifupdown"}}
+RUN apt install -y ifupdown2
+RUN mkdir -p /etc/network && printf '\
+auto eth0\n\
+allow-hotplug eth0\n\
+iface eth0 inet dhcp\n\
+' > /etc/network/interfaces
+{{ end }}

templates/ubuntu.Dockerfile

@@ -16,3 +16,26 @@ RUN apt-get update -y && \
 RUN systemctl preset-all
 
 RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd
+
+{{ if eq .NetworkManager "netplan" }}
+RUN apt install -y netplan.io
+RUN mkdir -p /etc/netplan && printf '\
+network:\n\
+  version: 2\n\
+  renderer: networkd\n\
+  ethernets:\n\
+    eth0:\n\
+      dhcp4: true\n\
+      nameservers:\n\
+        addresses:\n\
+        - 8.8.8.8\n\
+        - 8.8.4.4\n\
+' > /etc/netplan/00-netcfg.yaml \
+{{ else if eq .NetworkManager "ifupdown"}}
+RUN apt install -y ifupdown-ng
+RUN mkdir -p /etc/network && printf '\
+auto eth0\n\
+allow-hotplug eth0\n\
+iface eth0 inet dhcp\n\
+' > /etc/network/interfaces
+{{ end }}