bitbake: bitbake-layers: fix mapping files to layers

bitbake-layers needs to map recipe and class files to the layer they
came from within the show-recipes and show-overlayed commands. However,
it turns out that mapping a file to the layer it came from is not as
trivial as it might seem. To do it properly we need to match the path to
an entry in BBFILES then map that to the collection name using
BBFILE_PATTERN, then map that to the actual layer using variable
history. If it doesn't match any entry in BBFILES, then we can fall back
to BBFILE_PATTERN (to handle classes and conf files).

This fixes the layer name not showing up properly in the output of the
show-recipes and show-overlayed commands for recipes in layers such as
meta-intel that have subdirectories in BBFILE_PATTERN. It also fixes the
priority not showing up in show-layers for such layers.

As part of this I've added a function to VariableHistory which for a
space-separated list variable gives you a dict mapping the items added
to the files in which they were added. I've also fixed
bb.utils.get_file_layer() and reduced some of the duplication by using
this function in bitbake-layers. Also fixes the priority not showing up
for layers such as meta-intel

Fixes [YOCTO #8160].

(Bitbake rev: e852f6cabd7489585477ab567a1afeb2252377ac)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/data_smart.py

@@ -312,6 +312,31 @@ class VariableHistory(object):
                 lines.append(line)
         return lines
 
+    def get_variable_items_files(self, var, d):
+        """
+        Use variable history to map items added to a list variable and
+        the files in which they were added.
+        """
+        history = self.variable(var)
+        finalitems = (d.getVar(var, True) or '').split()
+        filemap = {}
+        isset = False
+        for event in history:
+            if 'flag' in event:
+                continue
+            if event['op'] == '_remove':
+                continue
+            if isset and event['op'] == 'set?':
+                continue
+            isset = True
+            items = d.expand(event['detail']).split()
+            for item in items:
+                # This is a little crude but is belt-and-braces to avoid us
+                # having to handle every possible operation type specifically
+                if item in finalitems and not item in filemap:
+                    filemap[item] = event['file']
+        return filemap
+
     def del_var_history(self, var, f=None, line=None):
         """If file f and line are not given, the entire history of var is deleted"""
         if var in self.variables: