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#!/usr/bin/env python3
#
# SPDX-License-Identifier: GPL-2.0-only
#
import os
import sys
import time
import select
import fcntl
import termios
import readline
import signal
def nonblockingfd(fd):
fcntl.fcntl(fd, fcntl.F_SETFL, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
def echonocbreak(fd):
old = termios.tcgetattr(fd)
old[3] = old[3] | termios.ECHO | termios.ICANON
termios.tcsetattr(fd, termios.TCSADRAIN, old)
def cbreaknoecho(fd):
old = termios.tcgetattr(fd)
old[3] = old[3] &~ termios.ECHO &~ termios.ICANON
termios.tcsetattr(fd, termios.TCSADRAIN, old)
if len(sys.argv) != 3 or sys.argv[1] in ('-h', '--help'):
print('oepydevshell-internal.py: error: the following arguments are required: pty, pid\n'
'Usage: oepydevshell-internal.py pty pid\n\n'
'OpenEmbedded oepydevshell-internal.py - internal script called from meta/classes/devshell.bbclass\n\n'
'arguments:\n'
' pty pty device name\n'
' pid parent process id\n\n'
'options:\n'
' -h, --help show this help message and exit\n')
sys.exit(2)
pty = open(sys.argv[1], "w+b", 0)
parent = int(sys.argv[2])
nonblockingfd(pty)
nonblockingfd(sys.stdin)
histfile = os.path.expanduser("~/.oepydevshell-history")
readline.parse_and_bind("tab: complete")
try:
readline.read_history_file(histfile)
except IOError:
pass
try:
i = ""
o = ""
# Need cbreak/noecho whilst in select so we trigger on any keypress
cbreaknoecho(sys.stdin.fileno())
# Send our PID to the other end so they can kill us.
pty.write(str(os.getpid()).encode('utf-8') + b"\n")
while True:
try:
writers = []
if i:
writers.append(sys.stdout)
(ready, _, _) = select.select([pty, sys.stdin], writers , [], 0)
try:
if pty in ready:
readdata = pty.read()
if readdata:
i = i + readdata.decode('utf-8')
if i:
# Write a page at a time to avoid overflowing output
# d.keys() is a good way to do that
sys.stdout.write(i[:4096])
sys.stdout.flush()
i = i[4096:]
if sys.stdin in ready:
echonocbreak(sys.stdin.fileno())
o = input().encode('utf-8')
cbreaknoecho(sys.stdin.fileno())
pty.write(o + b"\n")
except (IOError, OSError) as e:
if e.errno == 11:
continue
if e.errno == 5:
sys.exit(0)
raise
except EOFError:
sys.exit(0)
except KeyboardInterrupt:
os.kill(parent, signal.SIGINT)
except SystemExit:
pass
except Exception as e:
import traceback
print("Exception in oepydehshell-internal: " + str(e))
traceback.print_exc()
time.sleep(5)
finally:
readline.write_history_file(histfile)
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