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Add a new method ``Tree.revision_tree`` which allows access to cached
trees for arbitrary revisions. This allows the in development dirstate
tree format to provide access to the callers to cached copies of 
inventory data which are cheaper to access than inventories from the
repository. (Robert Collins, Martin Pool)

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bzrlib/gpg.py
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import errno
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import os
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import subprocess
 
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import sys
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from bzrlib import (
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    errors,
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    def sign(self, content):
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        ui.ui_factory.clear_term()
 
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        preexec_fn = _set_gpg_tty
 
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        if sys.platform == 'win32':
 
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            # Win32 doesn't support preexec_fn, but wouldn't support TTY anyway.
 
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            preexec_fn = None
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        try:
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            process = subprocess.Popen(self._command_line(),
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                                       stdin=subprocess.PIPE,
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                                       stdout=subprocess.PIPE,
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                                       preexec_fn=_set_gpg_tty)
 
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                                       preexec_fn=preexec_fn)
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            try:
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                result = process.communicate(content)[0]
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                if process.returncode is None: