buildman: Allow comparison of build configuration

It is useful to be able to see CONFIG changes made by commits. Add this
feature to buildman using the -K flag so that all CONFIG changes are
reported.

The CONFIG options exist in a number of files. Each is reported
individually as well as a summary that covers all files. The output
shows three parts: green for additions, red for removals and yellow for
changes.

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

3 files changed, 174 insertions, 15 deletions

diff --git a/tools/buildman/builder.py b/tools/buildman/builder.py
index 72353b9104..c7d3c86968 100644
--- a/tools/buildman/builder.py
+++ b/tools/buildman/builder.py
@@ -96,6 +96,13 @@ OUTCOME_OK, OUTCOME_WARNING, OUTCOME_ERROR, OUTCOME_UNKNOWN = range(4)
 # Translate a commit subject into a valid filename
 trans_valid_chars = string.maketrans("/: ", "---")
 
+CONFIG_FILENAMES = [
+    '.config', '.config-spl', '.config-tpl',
+    'autoconf.mk', 'autoconf-spl.mk', 'autoconf-tpl.mk',
+    'autoconf.h', 'autoconf-spl.h','autoconf-tpl.h',
+    'u-boot.cfg', 'u-boot-spl.cfg', 'u-boot-tpl.cfg'
+]
+
 
 class Builder:
     """Class for building U-Boot for a particular commit.
@@ -166,12 +173,17 @@ class Builder:
                     value is itself a dictionary:
                         key: function name
                         value: Size of function in bytes
+            config: Dictionary keyed by filename - e.g. '.config'. Each
+                    value is itself a dictionary:
+                        key: config name
+                        value: config value
         """
-        def __init__(self, rc, err_lines, sizes, func_sizes):
+        def __init__(self, rc, err_lines, sizes, func_sizes, config):
             self.rc = rc
             self.err_lines = err_lines
             self.sizes = sizes
             self.func_sizes = func_sizes
+            self.config = config
 
     def __init__(self, toolchains, base_dir, git_dir, num_threads, num_jobs,
                  gnu_make='make', checkout=True, show_unknown=True, step=1,
@@ -254,7 +266,7 @@ class Builder:
 
     def SetDisplayOptions(self, show_errors=False, show_sizes=False,
                           show_detail=False, show_bloat=False,
-                          list_error_boards=False):
+                          list_error_boards=False, show_config=False):
         """Setup display options for the builder.
 
         show_errors: True to show summarised error/warning info
@@ -262,12 +274,14 @@ class Builder:
         show_detail: Show detail for each board
         show_bloat: Show detail for each function
         list_error_boards: Show the boards which caused each error/warning
+        show_config: Show config deltas
         """
         self._show_errors = show_errors
         self._show_sizes = show_sizes
         self._show_detail = show_detail
         self._show_bloat = show_bloat
         self._list_error_boards = list_error_boards
+        self._show_config = show_config
 
     def _AddTimestamp(self):
         """Add a new timestamp to the list and record the build period.
@@ -519,13 +533,50 @@ class Builder:
                 sym[name] = sym.get(name, 0) + int(size, 16)
         return sym
 
-    def GetBuildOutcome(self, commit_upto, target, read_func_sizes):
+    def _ProcessConfig(self, fname):
+        """Read in a .config, autoconf.mk or autoconf.h file
+
+        This function handles all config file types. It ignores comments and
+        any #defines which don't start with CONFIG_.
+
+        Args:
+            fname: Filename to read
+
+        Returns:
+            Dictionary:
+                key: Config name (e.g. CONFIG_DM)
+                value: Config value (e.g. 1)
+        """
+        config = {}
+        if os.path.exists(fname):
+            with open(fname) as fd:
+                for line in fd:
+                    line = line.strip()
+                    if line.startswith('#define'):
+                        values = line[8:].split(' ', 1)
+                        if len(values) > 1:
+                            key, value = values
+                        else:
+                            key = values[0]
+                            value = ''
+                        if not key.startswith('CONFIG_'):
+                            continue
+                    elif not line or line[0] in ['#', '*', '/']:
+                        continue
+                    else:
+                        key, value = line.split('=', 1)
+                    config[key] = value
+        return config
+
+    def GetBuildOutcome(self, commit_upto, target, read_func_sizes,
+                        read_config):
         """Work out the outcome of a build.
 
         Args:
             commit_upto: Commit number to check (0..n-1)
             target: Target board to check
             read_func_sizes: True to read function size information
+            read_config: True to read .config and autoconf.h files
 
         Returns:
             Outcome object
@@ -534,6 +585,7 @@ class Builder:
         sizes_file = self.GetSizesFile(commit_upto, target)
         sizes = {}
         func_sizes = {}
+        config = {}
         if os.path.exists(done_file):
             with open(done_file, 'r') as fd:
                 return_code = int(fd.readline())
@@ -577,17 +629,25 @@ class Builder:
                                                                     '')
                         func_sizes[dict_name] = self.ReadFuncSizes(fname, fd)
 
-            return Builder.Outcome(rc, err_lines, sizes, func_sizes)
+            if read_config:
+                output_dir = self.GetBuildDir(commit_upto, target)
+                for name in CONFIG_FILENAMES:
+                    fname = os.path.join(output_dir, name)
+                    config[name] = self._ProcessConfig(fname)
+
+            return Builder.Outcome(rc, err_lines, sizes, func_sizes, config)
 
-        return Builder.Outcome(OUTCOME_UNKNOWN, [], {}, {})
+        return Builder.Outcome(OUTCOME_UNKNOWN, [], {}, {}, {})
 
-    def GetResultSummary(self, boards_selected, commit_upto, read_func_sizes):
+    def GetResultSummary(self, boards_selected, commit_upto, read_func_sizes,
+                         read_config):
         """Calculate a summary of the results of building a commit.
 
         Args:
             board_selected: Dict containing boards to summarise
             commit_upto: Commit number to summarize (0..self.count-1)
             read_func_sizes: True to read function size information
+            read_config: True to read .config and autoconf.h files
 
         Returns:
             Tuple:
@@ -599,6 +659,10 @@ class Builder:
                 List containing a summary of warning lines
                 Dict keyed by error line, containing a list of the Board
                     objects with that warning
+                Dictionary keyed by filename - e.g. '.config'. Each
+                    value is itself a dictionary:
+                        key: config name
+                        value: config value
         """
         def AddLine(lines_summary, lines_boards, line, board):
             line = line.rstrip()
@@ -613,10 +677,13 @@ class Builder:
         err_lines_boards = {}
         warn_lines_summary = []
         warn_lines_boards = {}
+        config = {}
+        for fname in CONFIG_FILENAMES:
+            config[fname] = {}
 
         for board in boards_selected.itervalues():
             outcome = self.GetBuildOutcome(commit_upto, board.target,
-                                           read_func_sizes)
+                                           read_func_sizes, read_config)
             board_dict[board.target] = outcome
             last_func = None
             last_was_warning = False
@@ -642,8 +709,14 @@ class Builder:
                                     line, board)
                         last_was_warning = is_warning
                         last_func = None
+            for fname in CONFIG_FILENAMES:
+                config[fname] = {}
+                if outcome.config:
+                    for key, value in outcome.config[fname].iteritems():
+                        config[fname][key] = value
+
         return (board_dict, err_lines_summary, err_lines_boards,
-                warn_lines_summary, warn_lines_boards)
+                warn_lines_summary, warn_lines_boards, config)
 
     def AddOutcome(self, board_dict, arch_list, changes, char, color):
         """Add an output to our list of outcomes for each architecture
@@ -696,11 +769,14 @@ class Builder:
         """
         self._base_board_dict = {}
         for board in board_selected:
-            self._base_board_dict[board] = Builder.Outcome(0, [], [], {})
+            self._base_board_dict[board] = Builder.Outcome(0, [], [], {}, {})
         self._base_err_lines = []
         self._base_warn_lines = []
         self._base_err_line_boards = {}
         self._base_warn_line_boards = {}
+        self._base_config = {}
+        for fname in CONFIG_FILENAMES:
+            self._base_config[fname] = {}
 
     def PrintFuncSizeDetail(self, fname, old, new):
         grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
@@ -895,7 +971,8 @@ class Builder:
 
     def PrintResultSummary(self, board_selected, board_dict, err_lines,
                            err_line_boards, warn_lines, warn_line_boards,
-                           show_sizes, show_detail, show_bloat):
+                           config, show_sizes, show_detail, show_bloat,
+                           show_config):
         """Compare results with the base results and display delta.
 
         Only boards mentioned in board_selected will be considered. This
@@ -916,9 +993,14 @@ class Builder:
                 none, or we don't want to print errors
             warn_line_boards: Dict keyed by warning line, containing a list of
                 the Board objects with that warning
+            config: Dictionary keyed by filename - e.g. '.config'. Each
+                    value is itself a dictionary:
+                        key: config name
+                        value: config value
             show_sizes: Show image size deltas
             show_detail: Show detail for each board
             show_bloat: Show detail for each function
+            show_config: Show config changes
         """
         def _BoardList(line, line_boards):
             """Helper function to get a line of boards containing a line
@@ -953,6 +1035,48 @@ class Builder:
                             _BoardList(line, base_line_boards) + line)
             return better_lines, worse_lines
 
+        def _CalcConfig(delta, name, config):
+            """Calculate configuration changes
+
+            Args:
+                delta: Type of the delta, e.g. '+'
+                name: name of the file which changed (e.g. .config)
+                config: configuration change dictionary
+                    key: config name
+                    value: config value
+            Returns:
+                String containing the configuration changes which can be
+                    printed
+            """
+            out = ''
+            for key in sorted(config.keys()):
+                out += '%s=%s ' % (key, config[key])
+            return '%5s %s: %s' % (delta, name, out)
+
+        def _ShowConfig(name, config_plus, config_minus, config_change):
+            """Show changes in configuration
+
+            Args:
+                config_plus: configurations added, dictionary
+                    key: config name
+                    value: config value
+                config_minus: configurations removed, dictionary
+                    key: config name
+                    value: config value
+                config_change: configurations changed, dictionary
+                    key: config name
+                    value: config value
+            """
+            if config_plus:
+                Print(_CalcConfig('+', name, config_plus),
+                      colour=self.col.GREEN)
+            if config_minus:
+                Print(_CalcConfig('-', name, config_minus),
+                      colour=self.col.RED)
+            if config_change:
+                Print(_CalcConfig('+/-', name, config_change),
+                      colour=self.col.YELLOW)
+
         better = []     # List of boards fixed since last commit
         worse = []      # List of new broken boards since last commit
         new = []        # List of boards that didn't exist last time
@@ -1013,12 +1137,42 @@ class Builder:
             self.PrintSizeSummary(board_selected, board_dict, show_detail,
                                   show_bloat)
 
+        if show_config:
+            all_config_plus = {}
+            all_config_minus = {}
+            all_config_change = {}
+            for name in CONFIG_FILENAMES:
+                if not config[name]:
+                    continue
+                config_plus = {}
+                config_minus = {}
+                config_change = {}
+                base = self._base_config[name]
+                for key, value in config[name].iteritems():
+                    if key not in base:
+                        config_plus[key] = value
+                        all_config_plus[key] = value
+                for key, value in base.iteritems():
+                    if key not in config[name]:
+                        config_minus[key] = value
+                        all_config_minus[key] = value
+                for key, value in base.iteritems():
+                    new_value = base[key]
+                    if key in config[name] and value != new_value:
+                        desc = '%s -> %s' % (value, new_value)
+                        config_change[key] = desc
+                        all_config_change[key] = desc
+                _ShowConfig(name, config_plus, config_minus, config_change)
+            _ShowConfig('all', all_config_plus, all_config_minus,
+                        all_config_change)
+
         # Save our updated information for the next call to this function
         self._base_board_dict = board_dict
         self._base_err_lines = err_lines
         self._base_warn_lines = warn_lines
         self._base_err_line_boards = err_line_boards
         self._base_warn_line_boards = warn_line_boards
+        self._base_config = config
 
         # Get a list of boards that did not get built, if needed
         not_built = []
@@ -1031,9 +1185,10 @@ class Builder:
 
     def ProduceResultSummary(self, commit_upto, commits, board_selected):
             (board_dict, err_lines, err_line_boards, warn_lines,
-                    warn_line_boards) = self.GetResultSummary(
+                    warn_line_boards, config) = self.GetResultSummary(
                     board_selected, commit_upto,
-                    read_func_sizes=self._show_bloat)
+                    read_func_sizes=self._show_bloat,
+                    read_config=self._show_config)
             if commits:
                 msg = '%02d: %s' % (commit_upto + 1,
                         commits[commit_upto].subject)
@@ -1041,7 +1196,8 @@ class Builder:
             self.PrintResultSummary(board_selected, board_dict,
                     err_lines if self._show_errors else [], err_line_boards,
                     warn_lines if self._show_errors else [], warn_line_boards,
-                    self._show_sizes, self._show_detail, self._show_bloat)
+                    config, self._show_sizes, self._show_detail,
+                    self._show_bloat, self._show_config)
 
     def ShowSummary(self, commits, board_selected):
         """Show a build summary for U-Boot for a given board list.
diff --git a/tools/buildman/cmdline.py b/tools/buildman/cmdline.py
index e8a6dadd1c..916ea57157 100644
--- a/tools/buildman/cmdline.py
+++ b/tools/buildman/cmdline.py
@@ -16,7 +16,7 @@ def ParseArgs():
     """
     parser = OptionParser()
     parser.add_option('-b', '--branch', type='string',
-          help='Branch name to build')
+          help='Branch name to build, or range of commits to build')
     parser.add_option('-B', '--bloat', dest='show_bloat',
           action='store_true', default=False,
           help='Show changes in function code size for each board')
@@ -53,6 +53,8 @@ def ParseArgs():
           default=None, help='Number of jobs to run at once (passed to make)')
     parser.add_option('-k', '--keep-outputs', action='store_true',
           default=False, help='Keep all build output files (e.g. binaries)')
+    parser.add_option('-K', '--show-config', action='store_true',
+          default=False, help='Show configuration changes in summary (both board config files and Kconfig)')
     parser.add_option('-l', '--list-error-boards', action='store_true',
           default=False, help='Show a list of boards next to each error/warning')
     parser.add_option('--list-tool-chains', action='store_true', default=False,
diff --git a/tools/buildman/control.py b/tools/buildman/control.py
index 720b978b23..8b3cd30c00 100644
--- a/tools/buildman/control.py
+++ b/tools/buildman/control.py
@@ -282,7 +282,8 @@ def DoBuildman(options, args, toolchains=None, make_func=None, boards=None,
             options.show_detail = True
         builder.SetDisplayOptions(options.show_errors, options.show_sizes,
                                   options.show_detail, options.show_bloat,
-                                  options.list_error_boards)
+                                  options.list_error_boards,
+                                  options.show_config)
         if options.summary:
             builder.ShowSummary(commits, board_selected)
         else: