code: def commitVersion(self, spec):
          ''' return a GithubComponentVersion object for a specific commit if valid
          '''
          import re
  
          commit_match = re.match('^[a-f0-9]{7,40}$', spec, re.I)
          if commit_match:
              return GitCloneVersion('', spec, self)
  
          return Nonf commitVersion(self, spec):
          ''' return a GithubComponentVersion object for a specific commit if valid
          '''
          import re
  
          commit_match = re.match('^[a-f0-9]{7,40}$', spec, re.I)
          if commit_match:
              return GitCloneVersion('', spec, self)
  
          return None
docs: return a GithubComponentVersion object for a specific commit if valid