As you know, layer order in BBLAYERS can affect in parsing recipes process,
in some cases, users want to add a layer on the top of BBLAYERS variable

So, add "--prepend" option for bitbake-layers to support add-layer to prepend

Signed-off-by: Hieu Van Nguyen <hieu2.nguyen@lge.com>
---
lib/bb/utils.py        | 7 +++++--
lib/bblayers/action.py | 3 ++-
2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/bb/utils.py b/lib/bb/utils.py
index 068b631c..086f1cc8 100644
--- a/lib/bb/utils.py
+++ b/lib/bb/utils.py
@@ -1412,7 +1412,7 @@ def edit_metadata_file(meta_file, variables, varfunc):
return updated

-def edit_bblayers_conf(bblayers_conf, add, remove, edit_cb=None):
+def edit_bblayers_conf(bblayers_conf, add, remove, prepend=None, edit_cb=None):
"""Edit bblayers.conf, adding and/or removing layers
Parameters:
bblayers_conf: path to bblayers.conf file to edit
@@ -1482,7 +1482,10 @@ def edit_bblayers_conf(bblayers_conf, add, remove, edit_cb=None):
for addlayer in addlayers:
if addlayer not in bblayers:
updated = True
-                    bblayers.append(addlayer)
+                    if prepend:
+                        bblayers.insert(0,addlayer)
+                    else:
+                        bblayers.append(addlayer)
del addlayers[:]

if edit_cb:
diff --git a/lib/bblayers/action.py b/lib/bblayers/action.py
index a8f26993..57d7195c 100644
--- a/lib/bblayers/action.py
+++ b/lib/bblayers/action.py
@@ -49,7 +49,7 @@ class ActionPlugin(LayerPlugin):
shutil.copy2(bblayers_conf, backup)

try:
-            notadded, _ = bb.utils.edit_bblayers_conf(bblayers_conf, layerdirs, None)
+            notadded, _ = bb.utils.edit_bblayers_conf(bblayers_conf, layerdirs, None, args.prepend)
self.tinfoil.modified_files()
if not (args.force or notadded):
try:
@@ -267,6 +267,7 @@ build results (as the layer priority order has effectively changed).
def register_commands(self, sp):
parser_add_layer = self.add_command(sp, 'add-layer', self.do_add_layer, parserecipes=False)
parser_add_layer.add_argument('layerdir', nargs='+', help='Layer directory/directories to add')
+        parser_add_layer.add_argument('--prepend', action='store_true', help='Prepend layer directory/directories')

parser_remove_layer = self.add_command(sp, 'remove-layer', self.do_remove_layer, parserecipes=False)
parser_remove_layer.add_argument('layerdir', nargs='+', help='Layer directory/directories to remove (wildcards allowed, enclose in quotes to avoid shell expansion)')
--
2.43.0