buildman: Implement an option to exclude boards from the build

Some boards are known to be broken and it is convenient to be able to
exclude them from the build.

Add an --exclude option to specific boards to exclude. This uses the
same matching rules as the normal 'include' arguments, and is a comma-
separated list of regular expressions.

Suggested-by: York Sun <yorksun@freescale.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

tools/buildman/README

@@ -114,6 +114,13 @@ the '&' operator to limit the selection:
 * 'freescale & arm sandbox'  All Freescale boards with ARM architecture,
                              plus sandbox
 
+You can also use -x to specifically exclude some boards. For example:
+
+ buildmand arm -x nvidia,freescale,.*ball$
+
+means to build all arm boards except nvidia, freescale and anything ending
+with 'ball'.
+
 It is convenient to use the -n option to see whaat will be built based on
 the subset given.
 

tools/buildman/board.py

@@ -239,13 +239,14 @@ class Boards:
             terms.append(term)
         return terms
 
-    def SelectBoards(self, args):
+    def SelectBoards(self, args, exclude=[]):
         """Mark boards selected based on args
 
         Args:
-            List of strings specifying boards to include, either named, or
-            by their target, architecture, cpu, vendor or soc. If empty, all
-            boards are selected.
+            args: List of strings specifying boards to include, either named,
+                  or by their target, architecture, cpu, vendor or soc. If
+                  empty, all boards are selected.
+            exclude: List of boards to exclude, regardless of 'args'
 
         Returns:
             Dictionary which holds the number of boards which were selected
@@ -258,17 +259,33 @@ class Boards:
         for term in terms:
             result[str(term)] = 0
 
+        exclude_list = []
+        for expr in exclude:
+            exclude_list.append(Expr(expr))
+
         for board in self._boards:
+            matching_term = None
+            build_it = False
             if terms:
                 match = False
                 for term in terms:
                     if term.Matches(board.props):
-                        board.build_it = True
-                        result[str(term)] += 1
-                        result['all'] += 1
+                        matching_term = str(term)
+                        build_it = True
                         break
             else:
+                build_it = True
+
+            # Check that it is not specifically excluded
+            for expr in exclude_list:
+                if expr.Matches(board.props):
+                    build_it = False
+                    break
+
+            if build_it:
                 board.build_it = True
+                if matching_term:
+                    result[matching_term] += 1
                 result['all'] += 1
 
         return result

tools/buildman/buildman.py

@@ -117,6 +117,9 @@ parser.add_option('-u', '--show_unknown', action='store_true',
        default=False, help='Show boards with unknown build result')
 parser.add_option('-v', '--verbose', action='store_true',
        default=False, help='Show build results while the build progresses')
+parser.add_option('-x', '--exclude', dest='exclude',
+      type='string', action='append',
+      help='Specify a list of boards to exclude, separated by comma')
 
 parser.usage += """
 

tools/buildman/control.py

@@ -127,7 +127,13 @@ def DoBuildman(options, args):
 
     boards = board.Boards()
     boards.ReadBoards(os.path.join(options.git, 'boards.cfg'))
-    why_selected = boards.SelectBoards(args)
+
+    exclude = []
+    if options.exclude:
+        for arg in options.exclude:
+            exclude += arg.split(',')
+
+    why_selected = boards.SelectBoards(args, exclude)
     selected = boards.GetSelected()
     if not len(selected):
         sys.exit(col.Color(col.RED, 'No matching boards found'))