forked from brl/citadel
98 lines
2.9 KiB
Python
98 lines
2.9 KiB
Python
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#!/usr/bin/env python3
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import os
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import sys
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import time
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import select
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import fcntl
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import termios
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import readline
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import signal
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def nonblockingfd(fd):
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fcntl.fcntl(fd, fcntl.F_SETFL, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
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def echonocbreak(fd):
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old = termios.tcgetattr(fd)
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old[3] = old[3] | termios.ECHO | termios.ICANON
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termios.tcsetattr(fd, termios.TCSADRAIN, old)
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def cbreaknoecho(fd):
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old = termios.tcgetattr(fd)
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old[3] = old[3] &~ termios.ECHO &~ termios.ICANON
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termios.tcsetattr(fd, termios.TCSADRAIN, old)
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if len(sys.argv) != 3 or sys.argv[1] in ('-h', '--help'):
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print('oepydevshell-internal.py: error: the following arguments are required: pty, pid\n'
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'Usage: oepydevshell-internal.py pty pid\n\n'
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'OpenEmbedded oepydevshell-internal.py - internal script called from meta/classes/devshell.bbclass\n\n'
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'arguments:\n'
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' pty pty device name\n'
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' pid parent process id\n\n'
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'options:\n'
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' -h, --help show this help message and exit\n')
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sys.exit(2)
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pty = open(sys.argv[1], "w+b", 0)
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parent = int(sys.argv[2])
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nonblockingfd(pty)
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nonblockingfd(sys.stdin)
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histfile = os.path.expanduser("~/.oedevpyshell-history")
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readline.parse_and_bind("tab: complete")
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try:
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readline.read_history_file(histfile)
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except IOError:
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pass
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try:
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i = ""
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o = ""
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# Need cbreak/noecho whilst in select so we trigger on any keypress
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cbreaknoecho(sys.stdin.fileno())
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# Send our PID to the other end so they can kill us.
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pty.write(str(os.getpid()).encode('utf-8') + b"\n")
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while True:
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try:
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writers = []
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if i:
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writers.append(sys.stdout)
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(ready, _, _) = select.select([pty, sys.stdin], writers , [], 0)
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try:
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if pty in ready:
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i = i + pty.read().decode('utf-8')
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if i:
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# Write a page at a time to avoid overflowing output
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# d.keys() is a good way to do that
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sys.stdout.write(i[:4096])
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sys.stdout.flush()
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i = i[4096:]
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if sys.stdin in ready:
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echonocbreak(sys.stdin.fileno())
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o = input().encode('utf-8')
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cbreaknoecho(sys.stdin.fileno())
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pty.write(o + b"\n")
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except (IOError, OSError) as e:
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if e.errno == 11:
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continue
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if e.errno == 5:
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sys.exit(0)
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raise
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except EOFError:
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sys.exit(0)
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except KeyboardInterrupt:
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os.kill(parent, signal.SIGINT)
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except SystemExit:
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pass
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except Exception as e:
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import traceback
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print("Exception in oepydehshell-internal: " + str(e))
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traceback.print_exc()
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time.sleep(5)
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finally:
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readline.write_history_file(histfile)
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