diff --git a/tools/patman/gitutil.py b/tools/patman/gitutil.py
new file mode 100644
index 0000000..48ca998
--- /dev/null
+++ b/tools/patman/gitutil.py
@@ -0,0 +1,372 @@
+# 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 command
+import re
+import os
+import series
+import settings
+import subprocess
+import sys
+import terminal
+
+
+def CountCommitsToBranch():
+    """Returns number of commits between HEAD and the tracking branch.
+
+    This looks back to the tracking branch and works out the number of commits
+    since then.
+
+    Return:
+        Number of patches that exist on top of the branch
+    """
+    pipe = [['git', 'log', '--oneline', '@{upstream}..'],
+            ['wc', '-l']]
+    stdout = command.RunPipe(pipe, capture=True, oneline=True)
+    patch_count = int(stdout)
+    return patch_count
+
+def CreatePatches(start, count, series):
+    """Create a series of patches from the top of the current branch.
+
+    The patch files are written to the current directory using
+    git format-patch.
+
+    Args:
+        start: Commit to start from: 0=HEAD, 1=next one, etc.
+        count: number of commits to include
+    Return:
+        Filename of cover letter
+        List of filenames of patch files
+    """
+    if series.get('version'):
+        version = '%s ' % series['version']
+    cmd = ['git', 'format-patch', '-M', '--signoff']
+    if series.get('cover'):
+        cmd.append('--cover-letter')
+    prefix = series.GetPatchPrefix()
+    if prefix:
+        cmd += ['--subject-prefix=%s' % prefix]
+    cmd += ['HEAD~%d..HEAD~%d' % (start + count, start)]
+
+    stdout = command.RunList(cmd)
+    files = stdout.splitlines()
+
+    # We have an extra file if there is a cover letter
+    if series.get('cover'):
+       return files[0], files[1:]
+    else:
+       return None, files
+
+def ApplyPatch(verbose, fname):
+    """Apply a patch with git am to test it
+
+    TODO: Convert these to use command, with stderr option
+
+    Args:
+        fname: filename of patch file to apply
+    """
+    cmd = ['git', 'am', fname]
+    pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)
+    stdout, stderr = pipe.communicate()
+    re_error = re.compile('^error: patch failed: (.+):(\d+)')
+    for line in stderr.splitlines():
+        if verbose:
+            print line
+        match = re_error.match(line)
+        if match:
+            print GetWarningMsg('warning', match.group(1), int(match.group(2)),
+                    'Patch failed')
+    return pipe.returncode == 0, stdout
+
+def ApplyPatches(verbose, args, start_point):
+    """Apply the patches with git am to make sure all is well
+
+    Args:
+        verbose: Print out 'git am' output verbatim
+        args: List of patch files to apply
+        start_point: Number of commits back from HEAD to start applying.
+            Normally this is len(args), but it can be larger if a start
+            offset was given.
+    """
+    error_count = 0
+    col = terminal.Color()
+
+    # Figure out our current position
+    cmd = ['git', 'name-rev', 'HEAD', '--name-only']
+    pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE)
+    stdout, stderr = pipe.communicate()
+    if pipe.returncode:
+        str = 'Could not find current commit name'
+        print col.Color(col.RED, str)
+        print stdout
+        return False
+    old_head = stdout.splitlines()[0]
+
+    # Checkout the required start point
+    cmd = ['git', 'checkout', 'HEAD~%d' % start_point]
+    pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)
+    stdout, stderr = pipe.communicate()
+    if pipe.returncode:
+        str = 'Could not move to commit before patch series'
+        print col.Color(col.RED, str)
+        print stdout, stderr
+        return False
+
+    # Apply all the patches
+    for fname in args:
+        ok, stdout = ApplyPatch(verbose, fname)
+        if not ok:
+            print col.Color(col.RED, 'git am returned errors for %s: will '
+                    'skip this patch' % fname)
+            if verbose:
+                print stdout
+            error_count += 1
+            cmd = ['git', 'am', '--skip']
+            pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE)
+            stdout, stderr = pipe.communicate()
+            if pipe.returncode != 0:
+                print col.Color(col.RED, 'Unable to skip patch! Aborting...')
+                print stdout
+                break
+
+    # Return to our previous position
+    cmd = ['git', 'checkout', old_head]
+    pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    stdout, stderr = pipe.communicate()
+    if pipe.returncode:
+        print col.Color(col.RED, 'Could not move back to head commit')
+        print stdout, stderr
+    return error_count == 0
+
+def BuildEmailList(in_list, tag=None, alias=None):
+    """Build a list of email addresses based on an input list.
+
+    Takes a list of email addresses and aliases, and turns this into a list
+    of only email address, by resolving any aliases that are present.
+
+    If the tag is given, then each email address is prepended with this
+    tag and a space. If the tag starts with a minus sign (indicating a
+    command line parameter) then the email address is quoted.
+
+    Args:
+        in_list:        List of aliases/email addresses
+        tag:            Text to put before each address
+
+    Returns:
+        List of email addresses
+
+    >>> alias = {}
+    >>> alias['fred'] = ['f.bloggs@napier.co.nz']
+    >>> alias['john'] = ['j.bloggs@napier.co.nz']
+    >>> alias['mary'] = ['Mary Poppins <m.poppins@cloud.net>']
+    >>> alias['boys'] = ['fred', ' john']
+    >>> alias['all'] = ['fred ', 'john', '   mary   ']
+    >>> BuildEmailList(['john', 'mary'], None, alias)
+    ['j.bloggs@napier.co.nz', 'Mary Poppins <m.poppins@cloud.net>']
+    >>> BuildEmailList(['john', 'mary'], '--to', alias)
+    ['--to "j.bloggs@napier.co.nz"', \
+'--to "Mary Poppins <m.poppins@cloud.net>"']
+    >>> BuildEmailList(['john', 'mary'], 'Cc', alias)
+    ['Cc j.bloggs@napier.co.nz', 'Cc Mary Poppins <m.poppins@cloud.net>']
+    """
+    quote = '"' if tag and tag[0] == '-' else ''
+    raw = []
+    for item in in_list:
+        raw += LookupEmail(item, alias)
+    result = []
+    for item in raw:
+        if not item in result:
+            result.append(item)
+    if tag:
+        return ['%s %s%s%s' % (tag, quote, email, quote) for email in result]
+    return result
+
+def EmailPatches(series, cover_fname, args, dry_run, cc_fname,
+        self_only=False, alias=None):
+    """Email a patch series.
+
+    Args:
+        series: Series object containing destination info
+        cover_fname: filename of cover letter
+        args: list of filenames of patch files
+        dry_run: Just return the command that would be run
+        cc_fname: Filename of Cc file for per-commit Cc
+        self_only: True to just email to yourself as a test
+
+    Returns:
+        Git command that was/would be run
+
+    >>> alias = {}
+    >>> alias['fred'] = ['f.bloggs@napier.co.nz']
+    >>> alias['john'] = ['j.bloggs@napier.co.nz']
+    >>> alias['mary'] = ['m.poppins@cloud.net']
+    >>> alias['boys'] = ['fred', ' john']
+    >>> alias['all'] = ['fred ', 'john', '   mary   ']
+    >>> alias[os.getenv('USER')] = ['this-is-me@me.com']
+    >>> series = series.Series()
+    >>> series.to = ['fred']
+    >>> series.cc = ['mary']
+    >>> EmailPatches(series, 'cover', ['p1', 'p2'], True, 'cc-fname', False, \
+            alias)
+    'git send-email --annotate --to "f.bloggs@napier.co.nz" --cc \
+"m.poppins@cloud.net" --cc-cmd "./patman --cc-cmd cc-fname" cover p1 p2'
+    >>> EmailPatches(series, None, ['p1'], True, 'cc-fname', False, alias)
+    'git send-email --annotate --to "f.bloggs@napier.co.nz" --cc \
+"m.poppins@cloud.net" --cc-cmd "./patman --cc-cmd cc-fname" p1'
+    >>> series.cc = ['all']
+    >>> EmailPatches(series, 'cover', ['p1', 'p2'], True, 'cc-fname', True, \
+            alias)
+    'git send-email --annotate --to "this-is-me@me.com" --cc-cmd "./patman \
+--cc-cmd cc-fname" cover p1 p2'
+    >>> EmailPatches(series, 'cover', ['p1', 'p2'], True, 'cc-fname', False, \
+            alias)
+    'git send-email --annotate --to "f.bloggs@napier.co.nz" --cc \
+"f.bloggs@napier.co.nz" --cc "j.bloggs@napier.co.nz" --cc \
+"m.poppins@cloud.net" --cc-cmd "./patman --cc-cmd cc-fname" cover p1 p2'
+    """
+    to = BuildEmailList(series.get('to'), '--to', alias)
+    if not to:
+        print ("No recipient, please add something like this to a commit\n"
+            "Series-to: Fred Bloggs <f.blogs@napier.co.nz>")
+        return
+    cc = BuildEmailList(series.get('cc'), '--cc', alias)
+    if self_only:
+        to = BuildEmailList([os.getenv('USER')], '--to', alias)
+        cc = []
+    cmd = ['git', 'send-email', '--annotate']
+    cmd += to
+    cmd += cc
+    cmd += ['--cc-cmd', '"%s --cc-cmd %s"' % (sys.argv[0], cc_fname)]
+    if cover_fname:
+        cmd.append(cover_fname)
+    cmd += args
+    str = ' '.join(cmd)
+    if not dry_run:
+        os.system(str)
+    return str
+
+
+def LookupEmail(lookup_name, alias=None, level=0):
+    """If an email address is an alias, look it up and return the full name
+
+    TODO: Why not just use git's own alias feature?
+
+    Args:
+        lookup_name: Alias or email address to look up
+
+    Returns:
+        tuple:
+            list containing a list of email addresses
+
+    Raises:
+        OSError if a recursive alias reference was found
+        ValueError if an alias was not found
+
+    >>> alias = {}
+    >>> alias['fred'] = ['f.bloggs@napier.co.nz']
+    >>> alias['john'] = ['j.bloggs@napier.co.nz']
+    >>> alias['mary'] = ['m.poppins@cloud.net']
+    >>> alias['boys'] = ['fred', ' john', 'f.bloggs@napier.co.nz']
+    >>> alias['all'] = ['fred ', 'john', '   mary   ']
+    >>> alias['loop'] = ['other', 'john', '   mary   ']
+    >>> alias['other'] = ['loop', 'john', '   mary   ']
+    >>> LookupEmail('mary', alias)
+    ['m.poppins@cloud.net']
+    >>> LookupEmail('arthur.wellesley@howe.ro.uk', alias)
+    ['arthur.wellesley@howe.ro.uk']
+    >>> LookupEmail('boys', alias)
+    ['f.bloggs@napier.co.nz', 'j.bloggs@napier.co.nz']
+    >>> LookupEmail('all', alias)
+    ['f.bloggs@napier.co.nz', 'j.bloggs@napier.co.nz', 'm.poppins@cloud.net']
+    >>> LookupEmail('odd', alias)
+    Traceback (most recent call last):
+    ...
+    ValueError: Alias 'odd' not found
+    >>> LookupEmail('loop', alias)
+    Traceback (most recent call last):
+    ...
+    OSError: Recursive email alias at 'other'
+    """
+    if not alias:
+        alias = settings.alias
+    lookup_name = lookup_name.strip()
+    if '@' in lookup_name: # Perhaps a real email address
+        return [lookup_name]
+
+    lookup_name = lookup_name.lower()
+
+    if level > 10:
+        raise OSError, "Recursive email alias at '%s'" % lookup_name
+
+    out_list = []
+    if lookup_name:
+        if not lookup_name in alias:
+            raise ValueError, "Alias '%s' not found" % lookup_name
+        for item in alias[lookup_name]:
+            todo = LookupEmail(item, alias, level + 1)
+            for new_item in todo:
+                if not new_item in out_list:
+                    out_list.append(new_item)
+
+    #print "No match for alias '%s'" % lookup_name
+    return out_list
+
+def GetTopLevel():
+    """Return name of top-level directory for this git repo.
+
+    Returns:
+        Full path to git top-level directory
+
+    This test makes sure that we are running tests in the right subdir
+
+    >>> os.path.realpath(os.getcwd()) == \
+            os.path.join(GetTopLevel(), 'tools', 'scripts', 'patman')
+    True
+    """
+    return command.OutputOneLine('git', 'rev-parse', '--show-toplevel')
+
+def GetAliasFile():
+    """Gets the name of the git alias file.
+
+    Returns:
+        Filename of git alias file, or None if none
+    """
+    fname = command.OutputOneLine('git', 'config', 'sendemail.aliasesfile')
+    if fname:
+        fname = os.path.join(GetTopLevel(), fname.strip())
+    return fname
+
+def Setup():
+    """Set up git utils, by reading the alias files."""
+    settings.Setup('')
+
+    # Check for a git alias file also
+    alias_fname = GetAliasFile()
+    if alias_fname:
+        settings.ReadGitAliases(alias_fname)
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()