image.bbclass: Set ROOTFS_RO_UNNEEDED correctly

Use a weak assignment for ROOTFS_RO_UNNEEDED to let users define their
own list overriding defaults.

Signed-off-by: David Vincent <freesilicon@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index 405fd73c043e2ee89e416e629df248eed78cd446..58cd608d14a4fae5b105735f91b0c05f2c73cecc 100644 (file)
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -33,7 +33,7 @@ ROOTFS_BOOTSTRAP_INSTALL = "run-postinsts"
 
 # These packages will be removed from a read-only rootfs after all other
 # packages have been installed
-ROOTFS_RO_UNNEEDED = "update-rc.d base-passwd shadow ${VIRTUAL-RUNTIME_update-alternatives} ${ROOTFS_BOOTSTRAP_INSTALL}"
+ROOTFS_RO_UNNEEDED ??= "update-rc.d base-passwd shadow ${VIRTUAL-RUNTIME_update-alternatives} ${ROOTFS_BOOTSTRAP_INSTALL}"
 
 # packages to install from features
 FEATURE_INSTALL = "${@' '.join(oe.packagegroup.required_packages(oe.data.typed_value('IMAGE_FEATURES', d), d))}"