[yocto] Dependencies on other file system types for custom file system type

[Eric Grunt]

better formatted class file:

inherit image_types

IMAGE_TYPEDEP_squashfs-xz-ubi = "squashfs-xz"

do_image_squashfs-xz-ubi[depends] += "mtd-utils-native:do_populate_sysroot"
do_image_squashfs-xz-ubi[depends] += "squashfs-tools-native:do_populate_sysroot"

IMAGE_CMD_squashfs-xz-ubi () {
	squashfsubi_mkfs "${MKUBIFS_ARGS}" "${UBINIZE_ARGS}"
}

squashfsubi_mkfs() {
 local mkubifs_args="$1"
 local ubinize_args="$2"
 CFG_NAME=ubinize-${IMAGE_NAME}-squashfs-xz-ubi.cfg

 # Added prompt error message for ubi and ubifs image creation.
 if [ -z "$mkubifs_args"] || [ -z "$ubinize_args" ]; then
   bbfatal "MKUBIFS_ARGS and UBINIZE_ARGS have to be set,\
   see http://www.linux-mtd.infradead.org/faq/ubifs.html for details"
 fi

 echo \[ubifs\] > ${CFG_NAME}
 echo mode=ubi >> ${CFG_NAME}
 echo \
 image=${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.squashfs-xz \
 >> ${CFG_NAME}

 echo vol_id=0 >> ${CFG_NAME}
 echo vol_type=dynamic >> ${CFG_NAME}
 echo vol_name=${UBI_VOLNAME} >> ${CFG_NAME}
 echo vol_flags=autoresize >> ${CFG_NAME}
 # normally we shouldn't need to create the squashfs image ourselves,
 # because we have a dependency declared (IMAGE_TYPEDEP)
 # But, if this file is modified, the dependency is _not_ rebuild,
 # so we have to do this ourselves.
 if [ ! -e ${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.squashfs-xz ]
 then
  bbwarn \
  "${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.squashfs-xz does
not exist. Creating."
  ${IMAGE_CMD_squashfs-xz}
 fi
 ubinize -o ${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.squashfs-xz-ubi \
 ${ubinize_args} ${CFG_NAME}

 # Cleanup cfg file
 mv ${CFG_NAME} ${IMGDEPLOYDIR}/
 }