Add 'patman' patch generation, checking and submission script

What is this?

=============

This tool is a Python script which:
- Creates patch directly from your branch
- Cleans them up by removing unwanted tags
- Inserts a cover letter with change lists
- Runs the patches through checkpatch.pl and its own checks
- Optionally emails them out to selected people

It is intended to automate patch creation and make it a less
error-prone process. It is useful for U-Boot and Linux work so far,
since it uses the checkpatch.pl script.

It is configured almost entirely by tags it finds in your commits.
This means that you can work on a number of different branches at
once, and keep the settings with each branch rather than having to
git format-patch, git send-email, etc. with the correct parameters
each time. So for example if you put:

in one of your commits, the series will be sent there.

See the README file for full details.
END

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

tools/patman/settings.py

@@ -0,0 +1,81 @@
+# Copyright (c) 2011 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 ConfigParser
+import os
+import re
+
+import command
+
+
+def ReadGitAliases(fname):
+    """Read a git alias file. This is in the form used by git:
+
+    alias uboot  u-boot@lists.denx.de
+    alias wd     Wolfgang Denk <wd@denx.de>
+
+    Args:
+        fname: Filename to read
+    """
+    try:
+        fd = open(fname, 'r')
+    except IOError:
+        print "Warning: Cannot find alias file '%s'" % fname
+        return
+
+    re_line = re.compile('alias\s+(\S+)\s+(.*)')
+    for line in fd.readlines():
+        line = line.strip()
+        if not line or line[0] == '#':
+            continue
+
+        m = re_line.match(line)
+        if not m:
+            print "Warning: Alias file line '%s' not understood" % line
+            continue
+
+        list = alias.get(m.group(1), [])
+        for item in m.group(2).split(','):
+            item = item.strip()
+            if item:
+                list.append(item)
+        alias[m.group(1)] = list
+
+    fd.close()
+
+def Setup(config_fname=''):
+    """Set up the settings module by reading config files.
+
+    Args:
+        config_fname:   Config filename to read ('' for default)
+    """
+    settings = ConfigParser.SafeConfigParser()
+    if config_fname == '':
+        config_fname = '%s/.config/patman' % os.getenv('HOME')
+    if config_fname:
+        settings.read(config_fname)
+
+    for name, value in settings.items('alias'):
+        alias[name] = value.split(',')
+
+
+# These are the aliases we understand, indexed by alias. Each member is a list.
+alias = {}