fix Alpine 3.17 support (close #16)

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

builder_test.go

@@ -121,6 +121,12 @@ func TestSyslinuxCfg(t *testing.T) {
 			initrd:    "/initrd.img",
 			sysconfig: syslinuxCfgDebian,
 		},
+		{
+			image:     "alpine:3.16",
+			kernel:    "/boot/vmlinuz-virt",
+			initrd:    "/boot/initramfs-virt",
+			sysconfig: syslinuxCfgAlpine,
+		},
 		{
 			image:     "alpine",
 			kernel:    "/boot/vmlinuz-virt",

cmd/d2vm/convert.go

@@ -60,6 +60,7 @@ var (
 			if parts := strings.Split(img, ":"); len(parts) > 1 {
 				img, tag = parts[0], parts[1]
 			}
+			img = fmt.Sprintf("%s:%s", img, tag)
 			size, err := parseSize(size)
 			if err != nil {
 				return err
@@ -75,9 +76,9 @@ var (
 				if err != nil {
 					return err
 				}
-				found = len(imgs) == 1 && imgs[0] == fmt.Sprintf("%s:%s", img, tag)
+				found = len(imgs) == 1 && imgs[0] == img
 				if found {
-					logrus.Infof("using local image %s:%s", img, tag)
+					logrus.Infof("using local image %s", img)
 				}
 			}
 			if pull || !found {

templates/alpine.Dockerfile

@@ -6,7 +6,14 @@ RUN apk update --no-cache && \
     apk add \
       util-linux \
       linux-virt \
+{{ if ge .Release.VersionID "3.17" }} \
+      busybox-openrc \
+      busybox-mdev-openrc \
+      busybox-extras-openrc \
+      busybox-mdev-openrc \
+{{ else }}
       busybox-initscripts \
+{{ end }}
       openrc
 
 RUN for s in bootmisc hostname hwclock modules networking swap sysctl urandom syslog; do rc-update add $s boot; done