1 files changed, 16 insertions, 1 deletions

diff --git a/repo b/repo
index 6b374f72..791e40cb 100755
--- a/repo
+++ b/repo
@@ -108,6 +108,7 @@ repodir = '.repo'               # name of repo's private directory
 S_repo = 'repo'                 # special repo repository
 S_manifests = 'manifests'       # special manifest repository
 REPO_MAIN = S_repo + '/main.py' # main script
+MIN_PYTHON_VERSION = (2, 6)     # minimum supported python version
 
 
 import optparse
@@ -129,6 +130,19 @@ else:
   urllib.request = urllib2
   urllib.error = urllib2
 
+# Python version check
+ver = sys.version_info
+if ver[0] == 3:
+  print('error: Python 3 support is not fully implemented in repo yet.\n'
+        'Please use Python 2.6 - 2.7 instead.',
+        file=sys.stderr)
+  sys.exit(1)
+if (ver[0], ver[1]) < MIN_PYTHON_VERSION:
+  print('error: Python version %s unsupported.\n'
+        'Please use Python 2.6 - 2.7 instead.'
+        % sys.version.split(' ')[0], file=sys.stderr)
+  sys.exit(1)
+
 home_dot_repo = os.path.expanduser('~/.repoconfig')
 gpg_dir = os.path.join(home_dot_repo, 'gnupg')
 
@@ -164,7 +178,8 @@ group.add_option('--depth', type='int', default=None,
                  help='create a shallow clone with given depth; see git clone')
 group.add_option('-g', '--groups',
                  dest='groups', default='default',
-                 help='restrict manifest projects to ones with a specified group',
+                 help='restrict manifest projects to ones with specified '
+                      'group(s) [default|all|G1,G2,G3|G4,-G5,-G6]',
                  metavar='GROUP')
 group.add_option('-p', '--platform',
                  dest='platform', default="auto",