patman: Add the concept of multiple projects

There are cases that we want to support different settings (or maybe
even different aliases) for different projects.  Add support for this
by:
* Adding detection for two big projects: U-Boot and Linux.
* Adding default settings for Linux (U-Boot is already good with the
  standard patman defaults).
* Extend the new "settings" feature in .patman to specify per-project
  settings.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>

4 files changed, 208 insertions, 4 deletions

diff --git a/tools/patman/README b/tools/patman/README
index 2743da9..1832ebd 100644
--- a/tools/patman/README
+++ b/tools/patman/README
@@ -114,6 +114,19 @@ verbose: True
 <<<
 
 
+If you want to adjust settings (or aliases) that affect just a single
+project you can add a section that looks like [project_settings] or
+[project_alias].  If you want to use tags for your linux work, you could
+do:
+
+>>>
+
+[linux_settings]
+process_tags: True
+
+<<<
+
+
 How to run it
 =============
 
diff --git a/tools/patman/patman.py b/tools/patman/patman.py
index b327c67..2e9e5dc 100755
--- a/tools/patman/patman.py
+++ b/tools/patman/patman.py
@@ -34,6 +34,7 @@ import checkpatch
 import command
 import gitutil
 import patchstream
+import project
 import settings
 import terminal
 import test
@@ -59,6 +60,9 @@ parser.add_option('--cc-cmd', dest='cc_cmd', type='string', action='store',
        default=None, help='Output cc list for patch file (used by git)')
 parser.add_option('--no-tags', action='store_false', dest='process_tags',
                   default=True, help="Don't process subject tags as aliaes")
+parser.add_option('-p', '--project', default=project.DetectProject(),
+                  help="Project name; affects default option values and "
+                  "aliases [default: %default]")
 
 parser.usage = """patman [options]
 
@@ -66,7 +70,10 @@ Create patches from commits in a branch, check them and email them as
 specified by tags you place in the commits. Use -n to """
 
 
-settings.Setup(parser, '')
+# Parse options twice: first to get the project and second to handle
+# defaults properly (which depends on project).
+(options, args) = parser.parse_args()
+settings.Setup(parser, options.project, '')
 (options, args) = parser.parse_args()
 
 # Run our meagre tests
diff --git a/tools/patman/project.py b/tools/patman/project.py
new file mode 100644
index 0000000..4f7b2b3
--- /dev/null
+++ b/tools/patman/project.py
@@ -0,0 +1,43 @@
+# Copyright (c) 2012 The Chromium OS Authors.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+import os.path
+
+import gitutil
+
+def DetectProject():
+    """Autodetect the name of the current project.
+
+    This looks for signature files/directories that are unlikely to exist except
+    in the given project.
+
+    Returns:
+        The name of the project, like "linux" or "u-boot".  Returns "unknown"
+        if we can't detect the project.
+    """
+    top_level = gitutil.GetTopLevel()
+
+    if os.path.exists(os.path.join(top_level, "include", "u-boot")):
+        return "u-boot"
+    elif os.path.exists(os.path.join(top_level, "kernel")):
+        return "linux"
+
+    return "unknown"
diff --git a/tools/patman/settings.py b/tools/patman/settings.py
index 5208f7d..084d1b8 100644
--- a/tools/patman/settings.py
+++ b/tools/patman/settings.py
@@ -26,6 +26,140 @@ import re
 import command
 import gitutil
 
+"""Default settings per-project.
+
+These are used by _ProjectConfigParser.  Settings names should match
+the "dest" of the option parser from patman.py.
+"""
+_default_settings = {
+    "u-boot": {},
+    "linux": {
+        "process_tags": "False",
+    }
+}
+
+class _ProjectConfigParser(ConfigParser.SafeConfigParser):
+    """ConfigParser that handles projects.
+
+    There are two main goals of this class:
+    - Load project-specific default settings.
+    - Merge general default settings/aliases with project-specific ones.
+
+    # Sample config used for tests below...
+    >>> import StringIO
+    >>> sample_config = '''
+    ... [alias]
+    ... me: Peter P. <likesspiders@example.com>
+    ... enemies: Evil <evil@example.com>
+    ...
+    ... [sm_alias]
+    ... enemies: Green G. <ugly@example.com>
+    ...
+    ... [sm2_alias]
+    ... enemies: Doc O. <pus@example.com>
+    ...
+    ... [settings]
+    ... am_hero: True
+    ... '''
+
+    # Check to make sure that bogus project gets general alias.
+    >>> config = _ProjectConfigParser("zzz")
+    >>> config.readfp(StringIO.StringIO(sample_config))
+    >>> config.get("alias", "enemies")
+    'Evil <evil@example.com>'
+
+    # Check to make sure that alias gets overridden by project.
+    >>> config = _ProjectConfigParser("sm")
+    >>> config.readfp(StringIO.StringIO(sample_config))
+    >>> config.get("alias", "enemies")
+    'Green G. <ugly@example.com>'
+
+    # Check to make sure that settings get merged with project.
+    >>> config = _ProjectConfigParser("linux")
+    >>> config.readfp(StringIO.StringIO(sample_config))
+    >>> sorted(config.items("settings"))
+    [('am_hero', 'True'), ('process_tags', 'False')]
+
+    # Check to make sure that settings works with unknown project.
+    >>> config = _ProjectConfigParser("unknown")
+    >>> config.readfp(StringIO.StringIO(sample_config))
+    >>> sorted(config.items("settings"))
+    [('am_hero', 'True')]
+    """
+    def __init__(self, project_name):
+        """Construct _ProjectConfigParser.
+
+        In addition to standard SafeConfigParser initialization, this also loads
+        project defaults.
+
+        Args:
+            project_name: The name of the project.
+        """
+        self._project_name = project_name
+        ConfigParser.SafeConfigParser.__init__(self)
+
+        # Update the project settings in the config based on
+        # the _default_settings global.
+        project_settings = "%s_settings" % project_name
+        if not self.has_section(project_settings):
+            self.add_section(project_settings)
+        project_defaults = _default_settings.get(project_name, {})
+        for setting_name, setting_value in project_defaults.iteritems():
+            self.set(project_settings, setting_name, setting_value)
+
+    def get(self, section, option, *args, **kwargs):
+        """Extend SafeConfigParser to try project_section before section.
+
+        Args:
+            See SafeConfigParser.
+        Returns:
+            See SafeConfigParser.
+        """
+        try:
+            return ConfigParser.SafeConfigParser.get(
+                self, "%s_%s" % (self._project_name, section), option,
+                *args, **kwargs
+            )
+        except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
+            return ConfigParser.SafeConfigParser.get(
+                self, section, option, *args, **kwargs
+            )
+
+    def items(self, section, *args, **kwargs):
+        """Extend SafeConfigParser to add project_section to section.
+
+        Args:
+            See SafeConfigParser.
+        Returns:
+            See SafeConfigParser.
+        """
+        project_items = []
+        has_project_section = False
+        top_items = []
+
+        # Get items from the project section
+        try:
+            project_items = ConfigParser.SafeConfigParser.items(
+                self, "%s_%s" % (self._project_name, section), *args, **kwargs
+            )
+            has_project_section = True
+        except ConfigParser.NoSectionError:
+            pass
+
+        # Get top-level items
+        try:
+            top_items = ConfigParser.SafeConfigParser.items(
+                self, section, *args, **kwargs
+            )
+        except ConfigParser.NoSectionError:
+            # If neither section exists raise the error on...
+            if not has_project_section:
+                raise
+
+        item_dict = dict(top_items)
+        item_dict.update(project_items)
+        return item_dict.items()
+
 def ReadGitAliases(fname):
     """Read a git alias file. This is in the form used by git:
 
@@ -102,7 +236,7 @@ def _UpdateDefaults(parser, config):
     Args:
         parser: An instance of an OptionParser whose defaults will be
             updated.
-        config: An instance of SafeConfigParser that we will query
+        config: An instance of _ProjectConfigParser that we will query
             for settings.
     """
     defaults = parser.get_default_values()
@@ -117,14 +251,16 @@ def _UpdateDefaults(parser, config):
         else:
             print "WARNING: Unknown setting %s" % name
 
-def Setup(parser, config_fname=''):
+def Setup(parser, project_name, config_fname=''):
     """Set up the settings module by reading config files.
 
     Args:
         parser:         The parser to update
+        project_name:   Name of project that we're working on; we'll look
+            for sections named "project_section" as well.
         config_fname:   Config filename to read ('' for default)
     """
-    config = ConfigParser.SafeConfigParser()
+    config = _ProjectConfigParser(project_name)
     if config_fname == '':
         config_fname = '%s/.patman' % os.getenv('HOME')
 
@@ -141,3 +277,8 @@ def Setup(parser, config_fname=''):
 
 # These are the aliases we understand, indexed by alias. Each member is a list.
 alias = {}
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()