3 files changed, 17 insertions, 0 deletions

diff --git a/meta/classes/insane.bbclass b/meta/classes/insane.bbclass
index 53942365ab..09d9fc1508 100644
--- a/meta/classes/insane.bbclass
+++ b/meta/classes/insane.bbclass
@@ -1047,6 +1047,19 @@ python () {
     # Check various variables
     ###########################################################################
 
+    # Checking ${FILESEXTRAPATHS}
+    extrapaths = (d.getVar("FILESEXTRAPATHS", True) or "")
+    if '__default' not in extrapaths.split(":"):
+        msg = "FILESEXTRAPATHS-variable, must always use _prepend (or _append)\n"
+        msg += "type of assignment, and don't forget the colon.\n"
+        msg += "Please assign it with the format of:\n"
+        msg += "  FILESEXTRAPATHS_append := \":${THISDIR}/Your_Files_Path\" or\n"
+        msg += "  FILESEXTRAPATHS_prepend := \"${THISDIR}/Your_Files_Path:\"\n"
+        msg += "in your bbappend file\n\n"
+        msg += "Your incorrect assignment is:\n"
+        msg += "%s\n" % extrapaths
+        bb.fatal(msg)
+
     if d.getVar('do_stage', True) is not None:
         bb.fatal("Legacy staging found for %s as it has a do_stage function. This will need conversion to a do_install or often simply removal to work with OE-core" % d.getVar("FILE", True))
 
diff --git a/meta/classes/utils.bbclass b/meta/classes/utils.bbclass
index 0ee13e04d7..0f2a484091 100644
--- a/meta/classes/utils.bbclass
+++ b/meta/classes/utils.bbclass
@@ -312,6 +312,8 @@ def explode_deps(s):
 def base_set_filespath(path, d):
     filespath = []
     extrapaths = (d.getVar("FILESEXTRAPATHS", True) or "")
+    # Remove default flag which was used for checking
+    extrapaths = extrapaths.replace("__default:", "")
     # Don't prepend empty strings to the path list
     if extrapaths != "":
         path = extrapaths.split(":") + path
diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 135461518c..5872d1d12c 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -311,6 +311,8 @@ FILES_${PN}-locale = "${datadir}/locale"
 FILE_DIRNAME = "${@os.path.dirname(d.getVar('FILE'))}"
 # FILESPATH is set in base.bbclass
 #FILESPATH = "${FILE_DIRNAME}/${PF}:${FILE_DIRNAME}/${P}:${FILE_DIRNAME}/${PN}:${FILE_DIRNAME}/${BP}:${FILE_DIRNAME}/${BPN}:${FILE_DIRNAME}/files:${FILE_DIRNAME}"
+# This default was only used for checking
+FILESEXTRAPATHS ?= "__default:"
 
 ##################################################################
 # General work and output directories for the build system.