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import logging
import os
import oe.classutils
import shlex
from bb.process import Popen, ExecutionError
logger = logging.getLogger('BitBake.OE.Terminal')
class UnsupportedTerminal(StandardError):
pass
class NoSupportedTerminals(StandardError):
pass
class Registry(oe.classutils.ClassRegistry):
command = None
def __init__(cls, name, bases, attrs):
super(Registry, cls).__init__(name.lower(), bases, attrs)
@property
def implemented(cls):
return bool(cls.command)
class Terminal(Popen):
__metaclass__ = Registry
def __init__(self, command, title=None, env=None):
self.format_command(command, title)
try:
Popen.__init__(self, self.command, env=env)
except OSError as exc:
import errno
if exc.errno == errno.ENOENT:
raise UnsupportedTerminal(self.name)
else:
raise
def format_command(self, command, title):
fmt = {'title': title or 'Terminal', 'command': command}
if isinstance(self.command, basestring):
self.command = shlex.split(self.command.format(**fmt))
else:
self.command = [element.format(**fmt) for element in self.command]
class XTerminal(Terminal):
def __init__(self, command, title=None, env=None):
Terminal.__init__(self, command, title, env)
if not os.environ.get('DISPLAY'):
raise UnsupportedTerminal(self.name)
class Gnome(XTerminal):
command = 'gnome-terminal --disable-factory -t "{title}" -x {command}'
priority = 2
class Konsole(XTerminal):
command = 'konsole -T "{title}" -e {command}'
priority = 2
class XTerm(XTerminal):
command = 'xterm -T "{title}" -e {command}'
priority = 1
class Rxvt(XTerminal):
command = 'rxvt -T "{title}" -e {command}'
priority = 1
class Screen(Terminal):
command = 'screen -D -m -t "{title}" -S devshell {command}'
def __init__(self, command, title=None, env=None):
Terminal.__init__(self, command, title, env)
logger.warn('Screen started. Please connect in another terminal with '
'"screen -r devshell"')
def prioritized():
return Registry.prioritized()
def spawn_preferred(command, title=None, env=None):
"""Spawn the first supported terminal, by priority"""
for terminal in prioritized():
try:
spawn(terminal.name, command, title, env)
break
except UnsupportedTerminal:
continue
else:
raise NoSupportedTerminals()
def spawn(name, command, title=None, env=None):
"""Spawn the specified terminal, by name"""
logger.debug(1, 'Attempting to spawn terminal "%s"', name)
try:
terminal = Registry.registry[name]
except KeyError:
raise UnsupportedTerminal(name)
pipe = terminal(command, title, env)
output = pipe.communicate()[0]
if pipe.returncode != 0:
raise ExecutionError(pipe.command, pipe.returncode, output)
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