Allow including initramfs-extra files in the initramfs (MR 48)

This uses a "deviceinfo_create_initfs_extra" to allow including
initramfs-extra files in the initramfs and skip creating a separate
initramfs-extra archive when it's set to "false".
If this variable is unset, mkinitfs uses a default value of "false".

pkgs/deviceinfo/deviceinfo.go

@@ -21,6 +21,7 @@ type DeviceInfo struct {
 	UbootBoardname         string
 	GenerateSystemdBoot    string
 	FormatVersion          string
+	CreateInitfsExtra      bool
 }
 
 // Reads the relevant entries from "file" into DeviceInfo struct
@@ -112,6 +113,7 @@ func (d DeviceInfo) String() string {
 			%s: %v
 			%s: %v
 			%s: %v
+			%s: %v
 	}`,
 		"deviceinfo_format_version", d.FormatVersion,
 		"deviceinfo_", d.FormatVersion,
@@ -120,5 +122,6 @@ func (d DeviceInfo) String() string {
 		"deviceinfo_ubootBoardname", d.UbootBoardname,
 		"deviceinfo_generateSystemdBoot", d.GenerateSystemdBoot,
 		"deviceinfo_formatVersion", d.FormatVersion,
+		"deviceinfo_createInitfsExtra", d.CreateInitfsExtra,
 	)
 }

pkgs/deviceinfo/deviceinfo_test.go

@@ -42,6 +42,7 @@ func TestNameToField(t *testing.T) {
 		{"modules_initfs", "ModulesInitfs"},
 		{"deviceinfo_initfs_compression___", "InitfsCompression"},
 		{"deviceinfo_initfs_extra_compression", "InitfsExtraCompression"},
+		{"deviceinfo_create_initfs_extra", "CreateInitfsExtra"},
 	}
 
 	for _, table := range tables {
@@ -65,6 +66,7 @@ func TestUnmarshal(t *testing.T) {
 			UbootBoardname:         "foobar-bazz",
 			InitfsCompression:      "zstd:--foo=1 -T0 --bar=bazz",
 			InitfsExtraCompression: "",
+			CreateInitfsExtra:      true,
 		},
 		},
 	}

pkgs/deviceinfo/test_resources/deviceinfo-unmarshal-1

@@ -4,3 +4,4 @@ deviceinfo_uboot_boardname="foobar-bazz"
 deviceinfo_initfs_compression="zstd:--foo=1 -T0 --bar=bazz"
 # empty option
 deviceinfo_initfs_extra_compression=""
+deviceinfo_create_initfs_extra="true"