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Migration issues in various releases.

• recipe-specific sysroots, so you must be more rigorous about DEPENDS – those dependencies will be populated into each recipe's sysroot
• PACKAGE_WRITE_DEPS to enumerate host tools necessary for pkg_preinst() and pkg_postinst() scripts; see “Post-Installation Scripts” in Dev Tasks Manual (see do_rootfs() task)

  PACKAGE_WRITE_DEPS += "${@bb.utils.contains('DISTRO_FEATURES','systemd sysvinit','systemd-systemctl-native','',d)}"

• SYSROOT_PREPROCESS_FUNCS
• Check per-recipe settings of SYSTEMD_AUTO_ENABLE

  recipes-bsp/apmd/apmd_3.2.2-15.bb:SYSTEMD_AUTO_ENABLE = "disable"
  recipes-connectivity/dhcp/dhcp.inc:SYSTEMD_AUTO_ENABLE_${PN}-server = "disable"
  recipes-connectivity/dhcp/dhcp.inc:SYSTEMD_AUTO_ENABLE_${PN}-relay = "disable"
  recipes-connectivity/dhcp/dhcp.inc:SYSTEMD_AUTO_ENABLE_${PN}-client = "disable"
  recipes-connectivity/wpa-supplicant/wpa-supplicant_2.6.bb:SYSTEMD_AUTO_ENABLE = "disable"
  recipes-core/util-linux/util-linux.inc:SYSTEMD_AUTO_ENABLE_${PN}-uuidd = "disable"
  recipes-core/util-linux/util-linux.inc:SYSTEMD_AUTO_ENABLE_${PN}-fstrim = "disable"
  recipes-devtools/dnf/dnf_2.7.5.bb:SYSTEMD_AUTO_ENABLE ?= "disable"
  recipes-extended/mdadm/mdadm_4.0.bb:SYSTEMD_AUTO_ENABLE = "disable"
  recipes-extended/watchdog/watchdog_5.15.bb:SYSTEMD_AUTO_ENABLE = "disable"
  recipes-extended/sysstat/sysstat.inc:SYSTEMD_AUTO_ENABLE = "enable"
  recipes-extended/sysklogd/sysklogd.inc:SYSTEMD_AUTO_ENABLE = "enable"
  recipes-kernel/lttng/lttng-tools_2.9.11.bb:SYSTEMD_AUTO_ENABLE = "disable"

• Per-recipe STAGING_DIR_NATIVE
• lnr (poky/scripts/lnr); relative_symlinks.bbclass

  do_install[postfuncs] += "install_relative_symlinks"
  
  python install_relative_symlinks () {
      oe.path.replace_absolute_symlinks(d.getVar('D'), d)
  }

• Smart package manager replaced by DNF
  • Smart no longer maintained
  • Smart not ported to Python 3
• RPM 5 downgraded to RPM 4
  • DNF incompatible with RPM 5
  • RPM 5 just not popular

• no need to include linux-dtb.inc anymore
• do_image_<type>[depends]

  image_types.bbclass:# do_image_tar[depends] += "tar-replacement-native:do_populate_sysroot"
  image_types.bbclass:do_image_cpio[depends] += "cpio-native:do_populate_sysroot"
  image_types.bbclass:do_image_jffs2[depends] += "mtd-utils-native:do_populate_sysroot"
  image_types.bbclass:do_image_cramfs[depends] += "util-linux-native:do_populate_sysroot"
  image_types.bbclass:do_image_ext2[depends] += "e2fsprogs-native:do_populate_sysroot"
  image_types.bbclass:do_image_ext3[depends] += "e2fsprogs-native:do_populate_sysroot"
  image_types.bbclass:do_image_ext4[depends] += "e2fsprogs-native:do_populate_sysroot"
  image_types.bbclass:do_image_btrfs[depends] += "btrfs-tools-native:do_populate_sysroot"
  image_types.bbclass:do_image_squashfs[depends] += "squashfs-tools-native:do_populate_sysroot"
  image_types.bbclass:do_image_squashfs_xz[depends] += "squashfs-tools-native:do_populate_sysroot"
  image_types.bbclass:do_image_squashfs_lzo[depends] += "squashfs-tools-native:do_populate_sysroot"
  image_types.bbclass:do_image_squashfs_lz4[depends] += "squashfs-tools-native:do_populate_sysroot"
  image_types.bbclass:do_image_ubi[depends] += "mtd-utils-native:do_populate_sysroot"
  image_types.bbclass:do_image_ubifs[depends] += "mtd-utils-native:do_populate_sysroot"
  image_types.bbclass:do_image_multiubi[depends] += "mtd-utils-native:do_populate_sysroot"
  image_types.bbclass:do_image_f2fs[depends] += "f2fs-tools-native:do_populate_sysroot"
  image_types_wic.bbclass:do_image_wic[depends] += "${@' '.join('%s-native:do_populate_sysroot' % r for r in ('parted', 'gptfdisk', 'dosfstools', 'mtools'))}"

• can't have DEPENDS on python-name anymore, need one of:
  • IMAGE_INSTALL_append = “ python-foo”
  • RDEPENDS_${PN} = “python-foo”
• check new use of KERNEL_PACKAGE_NAME, switch to:

  RDEPENDS_kernel-base = ""
  RDEPENDS_${KERNEL_PACKAGE_NAME}-base = ""