devshell: Add interactive python shell
Being able to interact with the python context in the Bitbake task execution
environment has long been desireable. This patch introduces such a
mechanism. Executing "bitbake X -c devpyshell" will open a terminal connected
to a python interactive interpretor in the task context so for example you can
run commands like "d.getVar('WORKDIR')"
This version now includes readline support for command history and various other
bug fixes such as exiting cleanly compared to previous versions.
(From OE-Core rev: 36734f34fe6e4b91e293234687e63c02f5b3117e)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Richard Purdie
parent
3bf24188b6
commit
cd7b437d4b
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@ -31,3 +31,124 @@ python () {
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d.setVarFlag("do_devshell", "manualfakeroot", "1")
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d.delVarFlag("do_devshell", "fakeroot")
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}
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def devpyshell(d):
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import code
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import select
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import signal
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import termios
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m, s = os.openpty()
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sname = os.ttyname(s)
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def noechoicanon(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.ISIG
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termios.tcsetattr(fd, termios.TCSADRAIN, old)
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# No echo or buffering over the pty
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noechoicanon(s)
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pid = os.fork()
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if pid:
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os.close(m)
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oe_terminal("oepydevshell-internal.py %s %d" % (sname, pid), 'OpenEmbedded Developer PyShell', d)
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os._exit(0)
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else:
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os.close(s)
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os.dup2(m, sys.stdin.fileno())
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os.dup2(m, sys.stdout.fileno())
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os.dup2(m, sys.stderr.fileno())
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sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
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sys.stdin = os.fdopen(sys.stdin.fileno(), 'r', 0)
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bb.utils.nonblockingfd(sys.stdout)
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bb.utils.nonblockingfd(sys.stderr)
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bb.utils.nonblockingfd(sys.stdin)
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_context = {
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"os": os,
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"bb": bb,
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"time": time,
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"d": d,
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}
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ps1 = "pydevshell> "
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ps2 = "... "
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buf = []
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more = False
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i = code.InteractiveInterpreter(locals=_context)
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print("OE PyShell (PN = %s)\n" % d.getVar("PN", True))
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def prompt(more):
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if more:
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prompt = ps2
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else:
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prompt = ps1
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sys.stdout.write(prompt)
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# Restore Ctrl+C since bitbake masks this
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def signal_handler(signal, frame):
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raise KeyboardInterrupt
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signal.signal(signal.SIGINT, signal_handler)
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child = None
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prompt(more)
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while True:
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try:
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try:
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(r, _, _) = select.select([sys.stdin], [], [], 1)
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if not r:
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continue
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line = sys.stdin.readline().strip()
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if not line:
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prompt(more)
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continue
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except EOFError as e:
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sys.stdout.write("\n")
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except (OSError, IOError) 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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return
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raise
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else:
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if not child:
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child = int(line)
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continue
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buf.append(line)
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source = "\n".join(buf)
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more = i.runsource(source, "<pyshell>")
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if not more:
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buf = []
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prompt(more)
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except KeyboardInterrupt:
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i.write("\nKeyboardInterrupt\n")
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buf = []
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more = False
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prompt(more)
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except SystemExit:
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# Easiest way to ensure everything exits
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os.kill(child, signal.SIGTERM)
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break
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python do_devpyshell() {
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import signal
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try:
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devpyshell(d)
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except SystemExit:
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# Stop the SIGTERM above causing an error exit code
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return
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finally:
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return
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}
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addtask devpyshell after do_patch
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do_devpyshell[nostamp] = "1"
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@ -0,0 +1,92 @@
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#!/usr/bin/env python
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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:
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print("Incorrect parameters")
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sys.exit(1)
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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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# Don't buffer output by line endings
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sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
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sys.stdin = os.fdopen(sys.stdin.fileno(), 'r', 0)
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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()) + "\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()
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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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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 = raw_input()
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cbreaknoecho(sys.stdin.fileno())
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pty.write(o + "\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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