[PATCH v2] pw_maintainers_cli: enhance ci tree selection

[<pbhagavatula@marvell.com>]

From: Pavan Nikhilesh <pbhagavatula@marvell.com>

When longest prefix match doesnt find a suitable tree, remove the
trees of files belonging to 'drivers/common' and check if there
is any unique tree for the patchset.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
---
 v2 Chnages:
 - Find tree by removing 'drivers/common' instead of count based
 approach.

 tools/pw_maintainers_cli.py | 31 ++++++++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 5 deletions(-)

diff --git a/tools/pw_maintainers_cli.py b/tools/pw_maintainers_cli.py
index c7b5ba0..ef60df8 100755
--- a/tools/pw_maintainers_cli.py
+++ b/tools/pw_maintainers_cli.py
@@ -203,13 +203,15 @@ class Maintainers(object):
         """
         Return a git tree that matches a list of files."""
         tree_list = []
+        file_tree_map = {}
         for _file in files:
             _tree = self._get_tree(_file)
             # Having no tree means that we accept those changes going through a
             # subtree (e.g. release notes).
             if _tree:
                 tree_list.append(_tree)
-        tree = self.get_common_denominator(tree_list)
+                file_tree_map[_file] = _tree
+        tree = self.get_common_denominator(tree_list, file_tree_map)
         if not tree:
             tree = 'git://dpdk.org/dpdk'
         return tree
@@ -268,7 +270,7 @@ class Maintainers(object):
         self.matched[matching_pattern] = tree
         return tree

-    def get_common_denominator(self, tree_list):
+    def get_common_denominator(self, tree_list, file_tree_map):
         """Finds a common tree by finding the longest common prefix.
         Examples for expected output:
           dpdk-next-virtio + dpdk = dpdk
@@ -278,7 +280,6 @@ class Maintainers(object):
         """
         # Make sure the list is unique.
         tree_list = list(set(tree_list))
-
         # Rename dpdk-next-virtio internally to match dpdk-next-net
         _tree_list = [
                 tree.replace('dpdk-next-virtio', 'dpdk-next-net-virtio')
@@ -286,11 +287,31 @@ class Maintainers(object):
         common_prefix = \
             os.path.commonprefix(_tree_list).rstrip('-').replace(
                     'dpdk-next-net-virtio', 'dpdk-next-virtio')
-        # There is no 'dpdk-next' named tree.
-        if common_prefix.endswith('dpdk-next') or common_prefix.endswith('/'):
+        # There is no 'dpdk-next' named tree, remove files that belong
+        # to 'drivers/common' and see if we find a tree.
+        if common_prefix.endswith('dpdk-next'):
+            common_prefix = self.get_filtered_tree(file_tree_map)
+        elif common_prefix.endswith('/'):
             common_prefix = 'git://dpdk.org/dpdk'
         return common_prefix

+    def get_common_files(self, files):
+        match_list = []
+        for f in files:
+            if re.match(r"drivers\/common", f) is not None:
+                match_list.append(f)
+        return match_list
+
+    def get_filtered_tree(self, file_tree_map):
+        # Get list of files that are in 'drivers/common'
+        common_list = self.get_common_files(file_tree_map.keys())
+        for c in common_list:
+            file_tree_map.pop(c, None)
+        tree_list = list(set(file_tree_map.values()))
+        if len(tree_list) == 1:
+            return tree_list[0]
+        return None
+

 if __name__ == '__main__':
     """Main procedure."""
--
2.25.1