get branch name with dot, dot output git errors

semver/get_version.py

@@ -1,32 +1,44 @@
+import argparse
 import subprocess
 try:
     from configparser import ConfigParser
 except ImportError:
     # Python < 3
     from ConfigParser import ConfigParser
+try:
+    from subprocess import DEVNULL # py3k
+except ImportError:
+    import os
+    DEVNULL = open(os.devnull, 'wb')
 
 
-def get_version():
+def get_version(dot=False):
     config = ConfigParser()
     config.read('./.bumpversion.cfg')
     version = config.get('bumpversion', 'current_version')
     # Get the commit hash of the version 
     v_hash = subprocess.Popen(['git', 'rev-list', '-n', '1', version], stdout=subprocess.PIPE,
-                             cwd='.').stdout.read().decode('utf-8').rstrip()
+                             stderr=DEVNULL, cwd='.').stdout.read().decode('utf-8').rstrip()
     # Get the current commit hash
     c_hash = subprocess.Popen(['git', 'rev-parse', 'HEAD'], stdout=subprocess.PIPE,
-                             cwd='.').stdout.read().decode('utf-8').rstrip()
+                             stderr=DEVNULL, cwd='.').stdout.read().decode('utf-8').rstrip()
     # If the version commit hash and current commit hash
     # do not match return the branch name else return the version
     if v_hash != c_hash:
         b = subprocess.Popen(['git', 'rev-parse', '--abbrev-ref', 'HEAD'], stdout=subprocess.PIPE,
-                            cwd='.').stdout.read().decode('utf-8').rstrip()
+                            stderr=DEVNULL, cwd='.').stdout.read().decode('utf-8').rstrip()
+        if dot:
+            b = b.replace('/','.')
         return b
     return version
 
 
 def main():
-    print(get_version())
+    parser = argparse.ArgumentParser(description='Get Version or Branch.')
+    parser.add_argument('-d','--dot', help='Switch out / for . to be used in docker tag', action='store_true', dest='dot')
+    args = parser.parse_args()
+
+    print(get_version(args.dot))
 
 if __name__ == '__main__':
     try: main()