fix: remove unused parameters from grub cmdline

Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.25 as builder
+FROM golang:1.25 AS builder
 
 WORKDIR /d2vm
 

bootloader.go

@@ -40,4 +40,5 @@ type BootloaderProvider interface {
 type Bootloader interface {
 	Validate(fs BootFS) error
 	Setup(ctx context.Context, dev, root, cmdline string) error
+	Static() bool
 }

builder.go

@@ -165,6 +165,11 @@ func NewBuilder(ctx context.Context, workdir, imgTag, disk string, size uint64,
 		return nil, err
 	}
 
+	if !bl.Static() {
+		config.Kernel = ""
+		config.Initrd = ""
+	}
+
 	if size == 0 {
 		size = 10 * uint64(datasize.GB)
 	}

config.go

@@ -60,11 +60,21 @@ type Config struct {
 }
 
 func (c Config) Cmdline(root Root, args ...string) string {
-	var r string
+	cmdline := "net.ifnames=0 rootfstype=ext4 console=tty0 console=ttyS0,115200n8"
+	if c.Kernel == "" && c.Initrd == "" {
+		return cmdline
+	}
+	parts := []string{"ro"}
 	if root != nil {
-		r = fmt.Sprintf("root=%s", root.String())
+		parts = append(parts, fmt.Sprintf("root=%s", root.String()))
+	}
+	if c.Initrd != "" {
+		parts = append(parts, fmt.Sprintf("initrd=%s", c.Initrd))
+	}
+	if len(args) != 0 {
+		parts = append(parts, args...)
 	}
-	return fmt.Sprintf("ro initrd=%s %s net.ifnames=0 rootfstype=ext4 console=tty0 console=ttyS0,115200n8 %s", c.Initrd, r, strings.Join(args, " "))
+	return strings.Join(append(parts, cmdline), " ")
 }
 
 func (r OSRelease) Config() (Config, error) {

grub.go

@@ -57,14 +57,14 @@ type grubProvider struct {
 	config Config
 }
 
-func (g grubProvider) New(c Config, r OSRelease, arch string) (Bootloader, error) {
+func (g grubProvider) New(_ Config, r OSRelease, arch string) (Bootloader, error) {
 	if arch != "x86_64" {
 		return nil, fmt.Errorf("grub is only supported for amd64")
 	}
 	if err := checkGrubEFISupport(r); err != nil {
 		return nil, err
 	}
-	return grub{grubCommon: newGrubCommon(c, r)}, nil
+	return grub{grubCommon: newGrubCommon(r)}, nil
 }
 
 func (g grubProvider) Name() string {

grub_bios.go

@@ -45,15 +45,13 @@ func (g grubBios) Setup(ctx context.Context, dev, root string, cmdline string) e
 	return nil
 }
 
-type grubBiosProvider struct {
-	config Config
-}
+type grubBiosProvider struct{}
 
-func (g grubBiosProvider) New(c Config, r OSRelease, arch string) (Bootloader, error) {
+func (g grubBiosProvider) New(_ Config, r OSRelease, arch string) (Bootloader, error) {
 	if arch != "x86_64" {
 		return nil, fmt.Errorf("grub-bios is only supported for amd64")
 	}
-	return grubBios{grubCommon: newGrubCommon(c, r)}, nil
+	return grubBios{grubCommon: newGrubCommon(r)}, nil
 }
 
 func (g grubBiosProvider) Name() string {

grub_common.go

@@ -38,20 +38,18 @@ GRUB_ENABLE_BLSCFG=false
 
 type grubCommon struct {
 	name string
-	c    Config
 	r    OSRelease
 	root string
 	dev  string
 }
 
-func newGrubCommon(c Config, r OSRelease) *grubCommon {
+func newGrubCommon(r OSRelease) *grubCommon {
 	name := "grub"
 	if r.ID == ReleaseCentOS || r.ID == ReleaseAlmaLinux || r.ID == ReleaseRocky {
 		name = "grub2"
 	}
 	return &grubCommon{
 		name: name,
-		c:    c,
 		r:    r,
 	}
 }
@@ -102,3 +100,7 @@ func (g *grubCommon) mkconfig(ctx context.Context) error {
 	}
 	return exec.Run(ctx, "chroot", g.root, g.name+"-mkconfig", "-o", "/boot/"+g.name+"/grub.cfg")
 }
+
+func (g *grubCommon) Static() bool {
+	return false
+}

grub_efi.go

@@ -53,15 +53,13 @@ func (g grubEFI) Setup(ctx context.Context, dev, root string, cmdline string) er
 	return nil
 }
 
-type grubEFIProvider struct {
-	config Config
-}
+type grubEFIProvider struct{}
 
-func (g grubEFIProvider) New(c Config, r OSRelease, arch string) (Bootloader, error) {
+func (g grubEFIProvider) New(_ Config, r OSRelease, arch string) (Bootloader, error) {
 	if err := checkGrubEFISupport(r); err != nil {
 		return nil, err
 	}
-	return grubEFI{grubCommon: newGrubCommon(c, r), arch: arch}, nil
+	return grubEFI{grubCommon: newGrubCommon(r), arch: arch}, nil
 }
 
 func (g grubEFIProvider) Name() string {

syslinux.go

@@ -91,6 +91,10 @@ func (s syslinuxProvider) New(c Config, _ OSRelease, arch string) (Bootloader, e
 	}, nil
 }
 
+func (s syslinux) Static() bool {
+	return true
+}
+
 func (s syslinuxProvider) Name() string {
 	return "syslinux"
 }