buildman: Create parent directories as necessary

When creating build directories also create parents as necessary. This
fixes a failure when building a hierarchical branch (i.e. foo/bar).

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Tom Rini <trini@ti.com>

tools/buildman/builder.py

@@ -1141,7 +1141,7 @@ class Builder:
         self._verbose = verbose
 
         self.ResetResultSummary(board_selected)
-        builderthread.Mkdir(self.base_dir)
+        builderthread.Mkdir(self.base_dir, parents = True)
         self._PrepareWorkingSpace(min(self.num_threads, len(board_selected)),
                 commits is not None)
         self._PrepareOutputSpace()

tools/buildman/builderthread.py

@@ -12,13 +12,16 @@ import threading
 import command
 import gitutil
 
-def Mkdir(dirname):
+def Mkdir(dirname, parents = False):
     """Make a directory if it doesn't already exist.
 
     Args:
         dirname: Directory to create
     """
     try:
+        if parents:
+            os.makedirs(dirname)
+        else:
             os.mkdir(dirname)
     except OSError as err:
         if err.errno == errno.EEXIST: