55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
# Low level unix utility functions
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#
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# Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import sys, os, pty, fcntl, termios, signal, logging
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import subprocess, traceback, shlex
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# Return the SIGINT interrupt handler back to the OS default
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def fix_sigint():
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signal.signal(signal.SIGINT, signal.SIG_DFL)
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fix_sigint()
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# Set a file-descriptor as non-blocking
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def set_nonblock(fd):
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fcntl.fcntl(fd, fcntl.F_SETFL
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, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
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# Clear HUPCL flag
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def clear_hupcl(fd):
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attrs = termios.tcgetattr(fd)
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attrs[2] = attrs[2] & ~termios.HUPCL
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termios.tcsetattr(fd, termios.TCSADRAIN, attrs)
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# Support for creating a pseudo-tty for emulating a serial port
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def create_pty(ptyname):
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mfd, sfd = pty.openpty()
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try:
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os.unlink(ptyname)
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except os.error:
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pass
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os.symlink(os.ttyname(sfd), ptyname)
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fcntl.fcntl(mfd, fcntl.F_SETFL
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, fcntl.fcntl(mfd, fcntl.F_GETFL) | os.O_NONBLOCK)
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old = termios.tcgetattr(mfd)
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old[3] = old[3] & ~termios.ECHO
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termios.tcsetattr(mfd, termios.TCSADRAIN, old)
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return mfd
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def get_git_version():
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# Obtain version info from "git" program
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gitdir = os.path.join(sys.path[0], '..', '.git')
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if not os.path.exists(gitdir):
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logging.debug("No '.git' file/directory found")
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return "?"
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prog = "git --git-dir=%s describe --tags --long --dirty" % (gitdir,)
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try:
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process = subprocess.Popen(shlex.split(prog), stdout=subprocess.PIPE)
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output = process.communicate()[0]
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retcode = process.poll()
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except OSError:
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logging.debug("Exception on run: %s" % (traceback.format_exc(),))
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return "?"
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return output.strip()
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