Default branch is appended to git checkout command, causing error

[jasondunsmore]

Whenever I attempt to use the checkout method, the default branch is appended to the git checkout command. Furthermore, there needs to be a space between the -f option and the branch/ref. Here are some examples:

In [8]: git.Repo.clone_from("git://github.com/gitpython-developers/GitPython.git", "/tmp/git-test").heads[0].checkout('0.3')
---------------------------------------------------------------------------
GitCommandError                           Traceback (most recent call last)
<ipython-input-8-5c49227b8211> in <module>()
----> 1 git.Repo.clone_from("git://github.com/gitpython-developers/GitPython.git", "/tmp/git-test").heads[0].checkout('0.3')

/home/jason/github/gitpython/git/refs/headref.pyc in checkout(self, force, **kwargs)
    164                         kwargs.pop('f')
    165 
--> 166                 self.repo.git.checkout(self, **kwargs)
    167                 return self.repo.active_branch
    168 

/home/jason/github/gitpython/git/cmd.pyc in <lambda>(*args, **kwargs)
    236                 if name[0] == '_':
    237                         return LazyMixin.__getattr__(self, name)
--> 238                 return lambda *args, **kwargs: self._call_process(name, *args, **kwargs)
    239 
    240         def _set_cache_(self, attr):

/home/jason/github/gitpython/git/cmd.pyc in _call_process(self, method, *args, **kwargs)
    502                         #END provide better error message
    503                 else:
--> 504                         return self.execute(make_call(), **_kwargs)
    505                 #END handle windows default installation
    506 

/home/jason/github/gitpython/git/cmd.pyc in execute(self, command, istream, with_keep_cwd, with_extended_output, with_exceptions, as_process, output_stream, output_strip, **subprocess_kwargs)
    395 
    396                 if with_exceptions and status != 0:
--> 397                         raise GitCommandError(command, status, stderr_value)
    398 
    399                 # Allow access to the command's status code

GitCommandError: 'git checkout -f0.3 0.3' returned exit status 129: error: unknown switch `0'
usage: git checkout [options] <branch>
   or: git checkout [options] [<branch>] -- <file>...

    -q, --quiet           be quiet
    -b <new branch>       branch
    -l                    log for new branch
    -t, --track           track
    --orphan <new branch>
                          new unparented branch
    -2, --ours            stage
    -3, --theirs          stage
    -f, --force           force
    -m, --merge           merge
    --conflict <style>    conflict style (merge or diff3)
    -p, --patch           select hunks interactively


In [11]: git.Repo.clone_from("git://github.com/gitpython-developers/GitPython.git", "/tmp/git-test0").heads[0].checkout('master')
---------------------------------------------------------------------------
GitCommandError                           Traceback (most recent call last)
<ipython-input-11-2828cd151765> in <module>()
----> 1 git.Repo.clone_from("git://github.com/gitpython-developers/GitPython.git", "/tmp/git-test0").heads[0].checkout('master')

/home/jason/github/gitpython/git/refs/headref.pyc in checkout(self, force, **kwargs)
    164                         kwargs.pop('f')
    165 
--> 166                 self.repo.git.checkout(self, **kwargs)
    167                 return self.repo.active_branch
    168 

/home/jason/github/gitpython/git/cmd.pyc in <lambda>(*args, **kwargs)
    236                 if name[0] == '_':
    237                         return LazyMixin.__getattr__(self, name)
--> 238                 return lambda *args, **kwargs: self._call_process(name, *args, **kwargs)
    239 
    240         def _set_cache_(self, attr):

/home/jason/github/gitpython/git/cmd.pyc in _call_process(self, method, *args, **kwargs)
    502                         #END provide better error message
    503                 else:
--> 504                         return self.execute(make_call(), **_kwargs)
    505                 #END handle windows default installation
    506 

/home/jason/github/gitpython/git/cmd.pyc in execute(self, command, istream, with_keep_cwd, with_extended_output, with_exceptions, as_process, output_stream, output_strip, **subprocess_kwargs)
    395 
    396                 if with_exceptions and status != 0:
--> 397                         raise GitCommandError(command, status, stderr_value)
    398 
    399                 # Allow access to the command's status code

GitCommandError: 'git checkout -fmaster 0.3' returned exit status 129: error: unknown switch `a'
usage: git checkout [options] <branch>
   or: git checkout [options] [<branch>] -- <file>...

    -q, --quiet           be quiet
    -b <new branch>       branch
    -l                    log for new branch
    -t, --track           track
    --orphan <new branch>
                          new unparented branch
    -2, --ours            stage
    -3, --theirs          stage
    -f, --force           force
    -m, --merge           merge
    --conflict <style>    conflict style (merge or diff3)
    -p, --patch           select hunks interactively

In the first example, I expected the command to be git checkout -f 0.3 and in the second example, I expected the command to be git checkout -f master.

This happens with both the 0.3 branch and the master branch. Let me know if you need any other info.

[Byron]

I could not reproduce this one, your example line worked fine for me. I am using git-python 0.3.2.1 and git 1.9.3.
Please leave a comment if it's still an issue for you.