poky/meta/conf/layer.conf

# We have a conf and classes directory, add to BBPATH
BBPATH .= ":${LAYERDIR}"
# We have recipes-* directories, add to BBFILES
BBFILES += "${LAYERDIR}/recipes-*/*/*.bb"

BBFILE_COLLECTIONS += "core"
BBFILE_PATTERN_core = "^${LAYERDIR}/"
BBFILE_PRIORITY_core = "5"

# This should only be incremented on significant changes that will
# cause compatibility issues with other layers
LAYERVERSION_core = "1"

# Set a variable to get to the top of the metadata location
COREBASE = '${@os.path.normpath("${LAYERDIR}/../")}'

# Set path to qemu image tests included in this layer
QEMUIMAGETESTS = "${COREBASE}/scripts/qemuimage-tests"

SIGGEN_EXCLUDERECIPES_ABISAFE += " \
  sysvinit-inittab \
  shadow-securetty \
  opkg-config-base \
  netbase \
  init-ifupdown \
  connman-conf \
  formfactor \
  xserver-xf86-config \
  pointercal \
  base-files \
  keymaps \
  udev-extraconf \
  packagegroup-x11-xserver \
  systemd-serialgetty \
"