image-container.bbclass: Add the "container" IMAGE_FSTYPES

The "container" fstype does very little other than pick tar.bz2 as the
actual image type and disable installation of ROOTFS_BOOTSTRAP_INSTALL.

[YOCTO #9502]

(From OE-Core rev: e45f074b792a43aa2fd84a5a3f0e20bf1d88ad7e)

Signed-off-by: Randy Witt <randy.e.witt@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/image-container.bbclass

@@ -0,0 +1,3 @@
+ROOTFS_BOOTSTRAP_INSTALL = ""
+IMAGE_TYPES_MASKED += "container"
+IMAGE_TYPEDEP_container = "tar.bz2"

meta/classes/image.bbclass

@@ -142,6 +142,9 @@ inherit ${IMAGE_TYPE_live}
 IMAGE_TYPE_vm = '${@bb.utils.contains_any("IMAGE_FSTYPES", ["vmdk", "vdi", "qcow2", "hdddirect"], "image-vm", "", d)}'
 inherit ${IMAGE_TYPE_vm}
 
+IMAGE_TYPE_container = '${@bb.utils.contains("IMAGE_FSTYPES", "container", "image-container", "", d)}'
+inherit ${IMAGE_TYPE_container}
+
 def build_uboot(d):
     if 'u-boot' in (d.getVar('IMAGE_FSTYPES') or ''):
         return "image_types_uboot"

meta/classes/image_types.bbclass

@@ -242,6 +242,7 @@ IMAGE_TYPES = " \
     hdddirect \
     elf \
     wic wic.gz wic.bz2 wic.lzma \
+    container \
 "
 
 # Compression is a special case of conversion. The old variable