[OE-core] [PATCH V2 8/8] oe/copy_buildsystem.py: add SDK_LAYERS_EXCLUDE_PATTERN

[Robert Yang]

It is helpful we want to exclude a lot of layers.
It uses python re, and supports multiple patterns (separated by space).

Signed-off-by: Robert Yang <liezhi.yang at windriver.com>
---
 meta/lib/oe/copy_buildsystem.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/meta/lib/oe/copy_buildsystem.py b/meta/lib/oe/copy_buildsystem.py
index 29ac6d4..e5d00c7 100644
--- a/meta/lib/oe/copy_buildsystem.py
+++ b/meta/lib/oe/copy_buildsystem.py
@@ -1,5 +1,12 @@
 # This class should provide easy access to the different aspects of the
 # buildsystem such as layers, bitbake location, etc.
+#
+# SDK_LAYERS_EXCLUDE: Layers which will be excluded from SDK layers.
+# SDK_LAYERS_EXCLUDE_PATTERN: The simiar to SDK_LAYERS_EXCLUDE, this supports
+#                             python regular expression, use space as separator,
+#                              e.g.: ".*-downloads closed-.*"
+#
+
 import stat
 import shutil
 
@@ -23,8 +30,10 @@ class BuildSystem(object):
         self.context = context
         self.layerdirs = [os.path.abspath(pth) for pth in d.getVar('BBLAYERS', True).split()]
         self.layers_exclude = (d.getVar('SDK_LAYERS_EXCLUDE', True) or "").split()
+        self.layers_exclude_pattern = d.getVar('SDK_LAYERS_EXCLUDE_PATTERN', True)
 
     def copy_bitbake_and_layers(self, destdir, workspace_name=None):
+        import re
         # Copy in all metadata layers + bitbake (as repositories)
         layers_copied = []
         bb.utils.mkdirhier(destdir)
@@ -36,8 +45,17 @@ class BuildSystem(object):
         # Exclude layers
         for layer_exclude in self.layers_exclude:
             if layer_exclude in layers:
+                bb.note('Excluded %s from sdk layers since it is in SDK_LAYERS_EXCLUDE' % layer_exclude)
                 layers.remove(layer_exclude)
 
+        if self.layers_exclude_pattern:
+            layers_cp = layers[:]
+            for pattern in self.layers_exclude_pattern.split():
+                for layer in layers_cp:
+                    if re.match(pattern, layer):
+                        bb.note('Excluded %s from sdk layers since matched SDK_LAYERS_EXCLUDE_PATTERN' % layer)
+                        layers.remove(layer)
+
         workspace_newname = workspace_name
         if workspace_newname:
             layernames = [os.path.basename(layer) for layer in layers]
-- 
2.10.2