When buildman starts, it prepares its output directory by removing any old
build directories which will not be used this time. This can happen if a
previous build left directories around for commit hashes which are no-longer
part of the branch.

This can take quite a while, so print a message to indicate what is going

Signed-off-by: Simon Glass <s...@chromium.org>

 tools/buildman/builder.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/buildman/builder.py b/tools/buildman/builder.py
index 7c237a5..a80333f 100644
--- a/tools/buildman/builder.py
+++ b/tools/buildman/builder.py
@@ -1410,8 +1410,14 @@ class Builder:
         for commit_upto in range(self.commit_count):
+        to_remove = []
         for dirname in glob.glob(os.path.join(self.base_dir, '*')):
             if dirname not in dir_list:
+                to_remove.append(dirname)
+        if to_remove:
+            Print('Removing %d old build directories' % len(to_remove),
+                  newline=False)
+            for dirname in to_remove:
     def BuildBoards(self, commits, board_selected, keep_outputs, verbose):

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