Add tool that downloads gm baseline images from the bots.
Review URL: http://codereview.appspot.com/5503082

git-svn-id: http://skia.googlecode.com/svn/trunk@2937 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/svn.py b/tools/svn.py
new file mode 100644
index 0000000..e878301
--- /dev/null
+++ b/tools/svn.py
@@ -0,0 +1,66 @@
+'''
+Copyright 2011 Google Inc.
+
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+'''
+
+import re
+import subprocess
+
+PROPERTY_MIMETYPE = 'svn:mime-type'
+
+class Svn:
+
+    def __init__(self, directory):
+        """Set up to manipulate SVN control within the given directory.
+
+        @param directory
+        """
+        self._directory = directory
+
+    def _RunCommand(self, args):
+        """Run a command (from self._directory) and return stdout as a single
+        string.
+
+        @param args a list of arguments
+        """
+        proc = subprocess.Popen(args, cwd=self._directory,
+                                stdout=subprocess.PIPE)
+        stdout = proc.communicate()[0]
+        returncode = proc.returncode
+        if returncode is not 0:
+            raise Exception('command "%s" failed in dir "%s": returncode=%s' %
+                            (args, self._directory, returncode))
+        return stdout
+
+    def GetNewFiles(self):
+        """Return a list of files which are in this directory but NOT under
+        SVN control.
+        """
+        stdout = self._RunCommand(['svn', 'status'])
+        new_regex = re.compile('\? +(.+)')
+        files = new_regex.findall(stdout)
+        return files
+
+    def AddFiles(self, filenames):
+        """Adds these files to SVN control.
+
+        @param filenames files to add to SVN control
+        """
+        args = ['svn', 'add']
+        args.extend(filenames)
+        print '\n\nAddFiles: %s' % args
+        print self._RunCommand(args)
+
+    def SetProperty(self, filenames, property_name, property_value):
+        """Sets a svn property for these files.
+
+        @param filenames files to set property on
+        @param property_name property_name to set for each file
+        @param property_value what to set the property_name to
+        """
+        args = ['svn', 'propset', property_name, property_value]
+        args.extend(filenames)
+        print '\n\nSetProperty: %s' % args
+        print self._RunCommand(args)