tools: buildman: Don't use the working dir as build dir

When the U-Boot base directory happens to have the same name as the branch
that buildman is directed to use via the '-b' option and no output
directory is specified with '-o', buildman happily starts removing the
whole U-Boot sources eventually only stopped with the error message:

OSError: [Errno 20] Not a directory: '../<branch-name>/boards.cfg

Add a check to avoid this and also deal with the case where '-o' points
to the source directory, or any subdirectory of it.

Finally, tidy up the confusing logic for removing the old tree when using
-b. This is only done when building a branch.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Lothar Waßmann <LW@KARO-electronics.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/tools/buildman/builderthread.py b/tools/buildman/builderthread.py
index fa9dec043a3..0efe80d9457 100644
--- a/tools/buildman/builderthread.py
+++ b/tools/buildman/builderthread.py
@@ -6,6 +6,7 @@ import errno
 import glob
 import os
 import shutil
+import sys
 import threading
 
 import command
@@ -26,6 +27,9 @@ def Mkdir(dirname, parents = False):
             os.mkdir(dirname)
     except OSError as err:
         if err.errno == errno.EEXIST:
+            if os.path.realpath('.') == os.path.realpath(dirname):
+                print "Cannot create the current working directory '%s'!" % dirname
+                sys.exit(1)
             pass
         else:
             raise