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Viewing changes to bzrlib/strace.py

(jelmer) Fix bug #1010339,
 use encoding_type='exact' for bzr testament (John A Meinel)

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bzrlib/strace.py
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"""Support for running strace against the current process."""
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from __future__ import absolute_import
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import errno
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import os
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import signal
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import subprocess
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from bzrlib import errors
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# this is currently test-focused, so importing bzrlib.tests is ok. We might
 
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# want to move feature to its own module though.
 
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from bzrlib.tests import Feature
 
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def strace(function, *args, **kwargs):
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    """Invoke strace on function.
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    # start strace
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    strace_cmd = ['strace', '-r', '-tt', '-p', str(pid), '-o', log_file.name]
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    if follow_children:
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        strace_cmd.append('-f')
 
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        strace_args.append('-f')
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    # need to catch both stdout and stderr to work around
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    # bug 627208
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    proc = subprocess.Popen(strace_cmd,
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        self.err_messages = err_messages
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class _StraceFeature(Feature):
 
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    def _probe(self):
 
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        try:
 
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            proc = subprocess.Popen(['strace'],
 
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                stderr=subprocess.PIPE,
 
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                stdout=subprocess.PIPE)
 
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            proc.communicate()
 
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            return True
 
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        except OSError, e:
 
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            if e.errno == errno.ENOENT:
 
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                # strace is not installed
 
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                return False
 
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            else:
 
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                raise
 
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    def feature_name(self):
 
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        return 'strace'
 
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StraceFeature = _StraceFeature()