diff options
Diffstat (limited to 'portage_with_autodep/pym/portage/util/_pty.py')
| -rw-r--r-- | portage_with_autodep/pym/portage/util/_pty.py | 152 |
1 files changed, 9 insertions, 143 deletions
diff --git a/portage_with_autodep/pym/portage/util/_pty.py b/portage_with_autodep/pym/portage/util/_pty.py index f45ff0a..11c8b92 100644 --- a/portage_with_autodep/pym/portage/util/_pty.py +++ b/portage_with_autodep/pym/portage/util/_pty.py @@ -1,144 +1,20 @@ # Copyright 2010-2011 Gentoo Foundation # Distributed under the terms of the GNU General Public License v2 -import array -import fcntl import platform import pty -import select -import sys import termios -from portage import os, _unicode_decode, _unicode_encode +from portage import os from portage.output import get_term_size, set_term_size -from portage.process import spawn_bash from portage.util import writemsg -def _can_test_pty_eof(): - """ - The _test_pty_eof() function seems to hang on most - kernels other than Linux. - This was reported for the following kernels which used to work fine - without this EOF test: Darwin, AIX, FreeBSD. They seem to hang on - the slave_file.close() call. Note that Python's implementation of - openpty on Solaris already caused random hangs without this EOF test - and hence is globally disabled. - @rtype: bool - @returns: True if _test_pty_eof() won't hang, False otherwise. - """ - return platform.system() in ("Linux",) - -def _test_pty_eof(fdopen_buffered=False): - """ - Returns True if this issues is fixed for the currently - running version of python: http://bugs.python.org/issue5380 - Raises an EnvironmentError from openpty() if it fails. - - NOTE: This issue is only problematic when array.fromfile() - is used, rather than os.read(). However, array.fromfile() - is preferred since it is approximately 10% faster. - - New development: It appears that array.fromfile() is usable - with python3 as long as fdopen is called with a bufsize - argument of 0. - """ - - use_fork = False - - test_string = 2 * "blah blah blah\n" - test_string = _unicode_decode(test_string, - encoding='utf_8', errors='strict') - - # may raise EnvironmentError - master_fd, slave_fd = pty.openpty() - - # Non-blocking mode is required for Darwin kernel. - fcntl.fcntl(master_fd, fcntl.F_SETFL, - fcntl.fcntl(master_fd, fcntl.F_GETFL) | os.O_NONBLOCK) - - # Disable post-processing of output since otherwise weird - # things like \n -> \r\n transformations may occur. - mode = termios.tcgetattr(slave_fd) - mode[1] &= ~termios.OPOST - termios.tcsetattr(slave_fd, termios.TCSANOW, mode) - - # Simulate a subprocess writing some data to the - # slave end of the pipe, and then exiting. - pid = None - if use_fork: - pids = spawn_bash(_unicode_encode("echo -n '%s'" % test_string, - encoding='utf_8', errors='strict'), env=os.environ, - fd_pipes={0:sys.stdin.fileno(), 1:slave_fd, 2:slave_fd}, - returnpid=True) - if isinstance(pids, int): - os.close(master_fd) - os.close(slave_fd) - raise EnvironmentError('spawn failed') - pid = pids[0] - else: - os.write(slave_fd, _unicode_encode(test_string, - encoding='utf_8', errors='strict')) - os.close(slave_fd) - - # If using a fork, we must wait for the child here, - # in order to avoid a race condition that would - # lead to inconsistent results. - if pid is not None: - os.waitpid(pid, 0) - - if fdopen_buffered: - master_file = os.fdopen(master_fd, 'rb') - else: - master_file = os.fdopen(master_fd, 'rb', 0) - eof = False - data = [] - iwtd = [master_file] - owtd = [] - ewtd = [] - - while not eof: - - events = select.select(iwtd, owtd, ewtd) - if not events[0]: - eof = True - break - - buf = array.array('B') - try: - buf.fromfile(master_file, 1024) - except (EOFError, IOError): - eof = True - - if not buf: - eof = True - else: - data.append(_unicode_decode(buf.tostring(), - encoding='utf_8', errors='strict')) - - master_file.close() - - return test_string == ''.join(data) - -# If _test_pty_eof() can't be used for runtime detection of -# http://bugs.python.org/issue5380, openpty can't safely be used -# unless we can guarantee that the current version of python has -# been fixed (affects all current versions of python3). When -# this issue is fixed in python3, we can add another sys.hexversion -# conditional to enable openpty support in the fixed versions. -if sys.hexversion >= 0x3000000 and not _can_test_pty_eof(): - _disable_openpty = True -else: - # Disable the use of openpty on Solaris as it seems Python's openpty - # implementation doesn't play nice on Solaris with Portage's - # behaviour causing hangs/deadlocks. - # Additional note for the future: on Interix, pipes do NOT work, so - # _disable_openpty on Interix must *never* be True - _disable_openpty = platform.system() in ("SunOS",) -_tested_pty = False - -if not _can_test_pty_eof(): - # Skip _test_pty_eof() on systems where it hangs. - _tested_pty = True +# Disable the use of openpty on Solaris as it seems Python's openpty +# implementation doesn't play nice on Solaris with Portage's +# behaviour causing hangs/deadlocks. +# Additional note for the future: on Interix, pipes do NOT work, so +# _disable_openpty on Interix must *never* be True +_disable_openpty = platform.system() in ("SunOS",) _fbsd_test_pty = platform.system() == 'FreeBSD' @@ -151,24 +27,14 @@ def _create_pty_or_pipe(copy_term_size=None): then the term size will be copied to the pty. @type copy_term_size: int @rtype: tuple - @returns: A tuple of (is_pty, master_fd, slave_fd) where + @return: A tuple of (is_pty, master_fd, slave_fd) where is_pty is True if a pty was successfully allocated, and False if a normal pipe was allocated. """ got_pty = False - global _disable_openpty, _fbsd_test_pty, _tested_pty - if not (_tested_pty or _disable_openpty): - try: - if not _test_pty_eof(): - _disable_openpty = True - except EnvironmentError as e: - _disable_openpty = True - writemsg("openpty failed: '%s'\n" % str(e), - noiselevel=-1) - del e - _tested_pty = True + global _disable_openpty, _fbsd_test_pty if _fbsd_test_pty and not _disable_openpty: # Test for python openpty breakage after freebsd7 to freebsd8 |