buildman: Allow building within a subdir of the current dir

This is useful in some situations, in particular with -w and when building
in-tree. Now that we are more careful about what we remove in
_PrepareOutputSpace(), it should be safe to relax this restriction.

Update the progress information also so it is clear what buildman is
doing. Remove files can take a long time.

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

tools/buildman/control.py

@@ -85,28 +85,6 @@ def ShowActions(series, why_selected, boards_selected, builder, options,
         for warning in board_warnings:
             print(col.Color(col.YELLOW, warning))
 
-def CheckOutputDir(output_dir):
-    """Make sure that the output directory is not within the current directory
-
-    If we try to use an output directory which is within the current directory
-    (which is assumed to hold the U-Boot source) we may end up deleting the
-    U-Boot source code. Detect this and print an error in this case.
-
-    Args:
-        output_dir: Output directory path to check
-    """
-    path = os.path.realpath(output_dir)
-    cwd_path = os.path.realpath('.')
-    while True:
-        if os.path.realpath(path) == cwd_path:
-            Print("Cannot use output directory '%s' since it is within the current directory '%s'" %
-                  (path, cwd_path))
-            sys.exit(1)
-        parent = os.path.dirname(path)
-        if parent == path:
-            break
-        path = parent
-
 def ShowToolchainInfo(boards, toolchains, print_arch, print_prefix):
     """Show information about a the tool chain used by one or more boards
 
@@ -331,7 +309,6 @@ def DoBuildman(options, args, toolchains=None, make_func=None, boards=None,
             output_dir = os.path.join(options.output_dir, dirname)
         if clean_dir and os.path.exists(output_dir):
             shutil.rmtree(output_dir)
-    CheckOutputDir(output_dir)
     builder = Builder(toolchains, output_dir, options.git_dir,
             options.threads, options.jobs, gnu_make=gnu_make, checkout=True,
             show_unknown=options.show_unknown, step=options.step,