[NaCl SDK] getos.py now checks against the Cr-Commit-Position.

native_client_sdk/src/tools/getos.py

Index: native_client_sdk/src/tools/getos.py
diff --git a/native_client_sdk/src/tools/getos.py b/native_client_sdk/src/tools/getos.py
index f14e02e0630494da2158a9bbacab2275fda9a9d1..8416b56f07648389db79b9e3c40e7fe95891c454 100755
--- a/native_client_sdk/src/tools/getos.py
+++ b/native_client_sdk/src/tools/getos.py
@@ -84,6 +84,7 @@ def GetSDKVersion():
 
   try:
     version = int(version)
+    revision = int(revision)
   except ValueError:
     raise Error("error parsing SDK README: %s" % readme)
 
@@ -183,6 +184,10 @@ def GetNaClArch(platform):
 
 
 def ParseVersion(version):
+  """Parses a version number of the form '<major>.<position>'.
+
+  <position> is the Cr-Commit-Position number.
+  """
   if '.' in version:
     version = version.split('.')
   else:
@@ -194,6 +199,22 @@ def ParseVersion(version):
     raise Error('error parsing SDK version: %s' % version)
 
 
+def CheckVersion(required_version):
+  """Determines whether the current SDK version meets the required version.
+
+  Args:
+    required_version: (major, position) pair, where position is the
+    Cr-Commit-Position number.
+
+  Raises:
+    Error: The SDK version is older than required_version.
+  """
+  version = GetSDKVersion()[:2]
+  if version < required_version:
+    raise Error("SDK version too old (current: %d.%d, required: %d.%d)"
+           % (version[0], version[1], required_version[0], required_version[1]))
+
+
 def main(args):
   parser = optparse.OptionParser()
   parser.add_option('--arch', action='store_true',
@@ -210,8 +231,10 @@ def main(args):
   parser.add_option('--sdk-commit-position', action='store_true',
       help='Print commit position of the NaCl SDK.')
   parser.add_option('--check-version',
+      metavar='MAJOR.POSITION',
       help='Check that the SDK version is at least as great as the '
-           'version passed in.')
+           'version passed in. MAJOR is the major version number and POSITION '
+           'is the Cr-Commit-Position number.')
 
   options, _ = parser.parse_args(args)
 
@@ -238,15 +261,7 @@ def main(args):
     out = GetSDKVersion()[2]
   elif options.check_version:
     required_version = ParseVersion(options.check_version)
-    version = GetSDKVersion()
-    # We currently ignore the revision and just check the major version number.
-    # Currently, version[1] is just a Git hash, which cannot be compared.
-    # TODO(mgiuca): Compare the minor revision numbers (which should be
-    # Cr-Commit-Position values), when http://crbug.com/406783 is fixed.
-    # Then Cr-Commit-Position should be available: see http://crbug.com/406993.
-    if version[0] < required_version[0]:
-      raise Error("SDK version too old (current: %s, required: %s)"
-             % (version[0], required_version[0]))
+    CheckVersion(required_version)
     out = None
 
   if out: