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[merge] Erik Bågfors: add --revision to bzr pull

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bzrlib/builtins.py
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    If you want to forget your local changes and just update your branch to
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    match the remote one, use --overwrite.
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    """
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    takes_options = ['remember', 'overwrite', 'verbose']
 
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    takes_options = ['remember', 'overwrite', 'revision', 'verbose']
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    takes_args = ['location?']
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    def run(self, location=None, remember=False, overwrite=False, verbose=False):
 
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    def run(self, location=None, remember=False, overwrite=False, revision=None, verbose=False):
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        from shutil import rmtree
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        import errno
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        # FIXME: too much stuff is in the command class        
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        br_from = Branch.open(location)
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        br_to = tree_to.branch
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        if revision is None:
 
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            rev_id = None
 
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        elif len(revision) == 1:
 
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            rev_id = revision[0].in_history(br_from).rev_id
 
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        else:
 
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            raise BzrCommandError('bzr pull --revision takes one value.')
 
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        old_rh = br_to.revision_history()
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        count = tree_to.pull(br_from, overwrite)
 
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        count = tree_to.pull(br_from, overwrite, rev_id)
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        if br_to.get_parent() is None or remember:
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            br_to.set_parent(location)