def run_command(self, command_list, filename, count, log_function):
"""Run command_list count times.
Parameters
----------
command_list : list
A list of args to provide to Popen. Each element of this
list will be interpolated with the filename to convert.
filename : unicode
The name of the file to convert.
count : int
How many times to run the command.
Returns
-------
success : bool
A boolean indicating if the command was successful (True)
or failed (False).
"""
command = [c.format(filename=filename) for c in command_list]
# On windows with python 2.x there is a bug in subprocess.Popen and
# unicode commands are not supported
if sys.platform == 'win32' and sys.version_info < (3,0):
#We must use cp1252 encoding for calling subprocess.Popen
#Note that sys.stdin.encoding and encoding.DEFAULT_ENCODING
# could be different (cp437 in case of dos console)
command = [c.encode('cp1252') for c in command]
# This will throw a clearer error if the command is not found
cmd = which(command_list[0])
if cmd is None:
raise OSError("%s not found on PATH" % command_list[0])
times = 'time' if count == 1 else 'times'
self.log.info("Running %s %i %s: %s", command_list[0], count, times, command)
shell = (sys.platform == 'win32')
if shell:
command = subprocess.list2cmdline(command)
env = os.environ.copy()
env['TEXINPUTS'] = os.pathsep.join([
cast_bytes_py2(self.texinputs),
env.get('TEXINPUTS', ''),
])
with open(os.devnull, 'rb') as null:
stdout = subprocess.PIPE if not self.verbose else None
for index in range(count):
p = subprocess.Popen(command, stdout=stdout, stdin=null, shell=shell, env=env)
out, err = p.communicate()
if p.returncode:
if self.verbose:
# verbose means I didn't capture stdout with PIPE,
# so it's already been displayed and `out` is None.
out = u''
else:
out = out.decode('utf-8', 'replace')
log_function(command, out)
return False # failure
return True # success
def add_anchor(html, anchor_link_text=u'¶'):
"""Add an id and an anchor-link to an html header
For use on markdown headings
"""
try:
h = ElementTree.fromstring(py3compat.cast_bytes_py2(html, encoding='utf-8'))
except Exception:
# failed to parse, just return it unmodified
return html
link = _convert_header_id(html2text(h))
h.set('id', link)
a = Element("a", {"class": "anchor-link", "href": "#" + link})
try:
# Test if the anchor link text is HTML (e.g. an image)
a.append(ElementTree.fromstring(anchor_link_text))
except Exception:
# If we fail to parse, assume we've just got regular text
a.text = anchor_link_text
h.append(a)
# Known issue of Python3.x, ElementTree.tostring() returns a byte string
# instead of a text string. See issue http://bugs.python.org/issue10942
# Workaround is to make sure the bytes are casted to a string.
return py3compat.decode(ElementTree.tostring(h), 'utf-8')
def import_item(name):
"""Import and return ``bar`` given the string ``foo.bar``.
Calling ``bar = import_item("foo.bar")`` is the functional equivalent of
executing the code ``from foo import bar``.
Parameters
----------
name : string
The fully qualified name of the module/package being imported.
Returns
-------
mod : module object
The module that was imported.
"""
if not isinstance(name, str):
raise TypeError("import_item accepts strings, not '%s'." % type(name))
name = cast_bytes_py2(name)
parts = name.rsplit('.', 1)
if len(parts) == 2:
# called with 'foo.bar....'
package, obj = parts
module = __import__(package, fromlist=[obj])
try:
pak = getattr(module, obj)
except AttributeError:
raise ImportError('No module named %s' % obj)
return pak
else:
# called with un-dotted string
return __import__(parts[0])
def import_item(name):
"""Import and return ``bar`` given the string ``foo.bar``.
Calling ``bar = import_item("foo.bar")`` is the functional equivalent of
executing the code ``from foo import bar``.
Parameters
----------
name : string
The fully qualified name of the module/package being imported.
Returns
-------
mod : module object
The module that was imported.
"""
if not isinstance(name, string_types):
raise TypeError("import_item accepts strings, not '%s'." % type(name))
name = cast_bytes_py2(name)
parts = name.rsplit('.', 1)
if len(parts) == 2:
# called with 'foo.bar....'
package, obj = parts
module = __import__(package, fromlist=[obj])
try:
pak = getattr(module, obj)
except AttributeError:
raise ImportError('No module named %s' % obj)
return pak
else:
# called with un-dotted string
return __import__(parts[0])
def add_anchor_lower_id(html, anchor_link_text="¶"):
from xml.etree.cElementTree import Element
from defusedxml import cElementTree as ElementTree
from ipython_genutils import py3compat
from nbconvert.filters.strings import _convert_header_id, html2text
try:
h = ElementTree.fromstring(
py3compat.cast_bytes_py2(html, encoding="utf-8"))
except Exception:
# failed to parse, just return it unmodified
return html
link = _convert_header_id(html2text(h))
h.set("id", slugify(link))
a = Element("a", {"class": "anchor-link", "href": "#" + link})
try:
# Test if the anchor link text is HTML (e.g. an image)
a.append(ElementTree.fromstring(anchor_link_text))
except Exception:
# If we fail to parse, assume we've just got regular text
a.text = anchor_link_text
h.append(a)
# Known issue of Python3.x, ElementTree.tostring() returns a byte string
# instead of a text string. See issue http://bugs.python.org/issue10942
# Workaround is to make sure the bytes are casted to a string.
return py3compat.decode(ElementTree.tostring(h), "utf-8")
def prepend_to_env_search_path(varname, value, envdict):
"""Add value to the environment variable varname in envdict
e.g. prepend_to_env_search_path('BIBINPUTS', '/home/sally/foo', os.environ)
"""
if not value:
return # Nothing to add
envdict[varname] = cast_bytes_py2(value) + os.pathsep + envdict.get(varname, '')
def prepend_to_env_search_path(varname, value, envdict):
"""Add value to the environment variable varname in envdict
e.g. prepend_to_env_search_path('BIBINPUTS', '/home/sally/foo', os.environ)
"""
if not value:
return # Nothing to add
envdict[varname] = cast_bytes_py2(value) + os.pathsep + envdict.get(varname, '')
def tunnel_to_kernel(connection_info, sshserver, sshkey=None):
"""tunnel connections to a kernel via ssh
This will open four SSH tunnels from localhost on this machine to the
ports associated with the kernel. They can be either direct
localhost-localhost tunnels, or if an intermediate server is necessary,
the kernel must be listening on a public IP.
Parameters
----------
connection_info : dict or str (path)
Either a connection dict, or the path to a JSON connection file
sshserver : str
The ssh sever to use to tunnel to the kernel. Can be a full
`user@server:port` string. ssh config aliases are respected.
sshkey : str [optional]
Path to file containing ssh key to use for authentication.
Only necessary if your ssh config does not already associate
a keyfile with the host.
Returns
-------
(shell, iopub, stdin, hb) : ints
The four ports on localhost that have been forwarded to the kernel.
"""
from zmq.ssh import tunnel
if isinstance(connection_info, string_types):
# it's a path, unpack it
with open(connection_info) as f:
connection_info = json.loads(f.read())
cf = connection_info
lports = tunnel.select_random_ports(4)
rports = cf['shell_port'], cf['iopub_port'], cf['stdin_port'], cf[
'hb_port']
remote_ip = cf['ip']
if tunnel.try_passwordless_ssh(sshserver, sshkey):
password = False
else:
password = getpass("SSH Password for %s: " % cast_bytes_py2(sshserver))
for lp, rp in zip(lports, rports):
tunnel.ssh_tunnel(lp, rp, sshserver, remote_ip, sshkey, password)
return tuple(lports)
def tunnel_to_kernel(connection_info, sshserver, sshkey=None):
"""tunnel connections to a kernel via ssh
This will open four SSH tunnels from localhost on this machine to the
ports associated with the kernel. They can be either direct
localhost-localhost tunnels, or if an intermediate server is necessary,
the kernel must be listening on a public IP.
Parameters
----------
connection_info : dict or str (path)
Either a connection dict, or the path to a JSON connection file
sshserver : str
The ssh sever to use to tunnel to the kernel. Can be a full
`user@server:port` string. ssh config aliases are respected.
sshkey : str [optional]
Path to file containing ssh key to use for authentication.
Only necessary if your ssh config does not already associate
a keyfile with the host.
Returns
-------
(shell, iopub, stdin, hb) : ints
The four ports on localhost that have been forwarded to the kernel.
"""
from zmq.ssh import tunnel
if isinstance(connection_info, string_types):
# it's a path, unpack it
with open(connection_info) as f:
connection_info = json.loads(f.read())
cf = connection_info
lports = tunnel.select_random_ports(4)
rports = cf['shell_port'], cf['iopub_port'], cf['stdin_port'], cf['hb_port']
remote_ip = cf['ip']
if tunnel.try_passwordless_ssh(sshserver, sshkey):
password=False
else:
password = getpass("SSH Password for %s: " % cast_bytes_py2(sshserver))
for lp,rp in zip(lports, rports):
tunnel.ssh_tunnel(lp, rp, sshserver, remote_ip, sshkey, password)
return tuple(lports)
def add_anchor(html):
"""Add an anchor-link to an html header
For use on markdown headings
"""
try:
h = ElementTree.fromstring(py3compat.cast_bytes_py2(html, encoding='utf-8'))
except Exception:
# failed to parse, just return it unmodified
return html
link = html2text(h).replace(' ', '-')
h.set('id', link)
a = ElementTree.Element("a", {"class" : "anchor-link", "href" : "#" + link})
a.text = u'¶'
h.append(a)
# Known issue of Python3.x, ElementTree.tostring() returns a byte string
# instead of a text string. See issue http://bugs.python.org/issue10942
# Workaround is to make sure the bytes are casted to a string.
return py3compat.decode(ElementTree.tostring(h), 'utf-8')
def add_anchor(html):
"""Add an anchor-link to an html header
For use on markdown headings
"""
try:
h = ElementTree.fromstring(py3compat.cast_bytes_py2(html, encoding='utf-8'))
except Exception:
# failed to parse, just return it unmodified
return html
link = html2text(h).replace(' ', '-')
h.set('id', link)
a = ElementTree.Element("a", {"class" : "anchor-link", "href" : "#" + link})
a.text = u'¶'
h.append(a)
# Known issue of Python3.x, ElementTree.tostring() returns a byte string
# instead of a text string. See issue http://bugs.python.org/issue10942
# Workaround is to make sure the bytes are casted to a string.
return py3compat.decode(ElementTree.tostring(h), 'utf-8')
def launch_kernel(cmd,
stdin=None,
stdout=None,
stderr=None,
env=None,
independent=False,
cwd=None,
**kw):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
cmd : Popen list,
A string of Python code that imports and executes a kernel entry point.
stdin, stdout, stderr : optional (default None)
Standards streams, as defined in subprocess.Popen.
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
cwd : path, optional
The working dir of the kernel process (default: cwd of this process).
Returns
-------
Popen instance for the kernel subprocess
"""
# Popen will fail (sometimes with a deadlock) if stdin, stdout, and stderr
# are invalid. Unfortunately, there is in general no way to detect whether
# they are valid. The following two blocks redirect them to (temporary)
# pipes in certain important cases.
# If this process has been backgrounded, our stdin is invalid. Since there
# is no compelling reason for the kernel to inherit our stdin anyway, we'll
# place this one safe and always redirect.
redirect_in = True
_stdin = PIPE if stdin is None else stdin
# If this process in running on pythonw, we know that stdin, stdout, and
# stderr are all invalid.
redirect_out = sys.executable.endswith('pythonw.exe')
if redirect_out:
blackhole = open(os.devnull, 'w')
_stdout = blackhole if stdout is None else stdout
_stderr = blackhole if stderr is None else stderr
else:
_stdout, _stderr = stdout, stderr
env = env if (env is not None) else os.environ.copy()
encoding = getdefaultencoding(prefer_stream=False)
kwargs = dict(
stdin=_stdin,
stdout=_stdout,
stderr=_stderr,
cwd=cwd,
env=env,
)
# Spawn a kernel.
if sys.platform == 'win32':
# Popen on Python 2 on Windows cannot handle unicode args or cwd
cmd = [cast_bytes_py2(c, encoding) for c in cmd]
if cwd:
cwd = cast_bytes_py2(cwd, sys.getfilesystemencoding() or 'ascii')
kwargs['cwd'] = cwd
from .win_interrupt import create_interrupt_event
# Create a Win32 event for interrupting the kernel
# and store it in an environment variable.
interrupt_event = create_interrupt_event()
env["JPY_INTERRUPT_EVENT"] = str(interrupt_event)
# deprecated old env name:
env["IPY_INTERRUPT_EVENT"] = env["JPY_INTERRUPT_EVENT"]
try:
from _winapi import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS, CREATE_NEW_PROCESS_GROUP
except:
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS, CREATE_NEW_PROCESS_GROUP
# Launch the kernel process
if independent:
kwargs['creationflags'] = CREATE_NEW_PROCESS_GROUP
else:
pid = GetCurrentProcess()
handle = DuplicateHandle(
pid,
pid,
pid,
0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
env['JPY_PARENT_PID'] = str(int(handle))
else:
if independent:
kwargs['preexec_fn'] = lambda: os.setsid()
else:
# Create a new process group. This makes it easier to
# interrupt the kernel, because we want to interrupt the
# children of the kernel process also.
kwargs['preexec_fn'] = lambda: os.setpgrp()
env['JPY_PARENT_PID'] = str(os.getpid())
try:
proc = Popen(cmd, **kwargs)
except Exception as exc:
msg = ("Failed to run command:\n{}\n" "with kwargs:\n{!r}\n")
msg = msg.format(cmd, kwargs)
get_logger().error(msg)
raise
if sys.platform == 'win32':
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
# Clean up pipes created to work around Popen bug.
if redirect_in:
if stdin is None:
proc.stdin.close()
return proc
def launch_kernel(cmd,
stdin=None,
stdout=None,
stderr=None,
env=None,
independent=False,
cwd=None,
**kw):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
cmd : Popen list,
A string of Python code that imports and executes a kernel entry point.
stdin, stdout, stderr : optional (default None)
Standards streams, as defined in subprocess.Popen.
env: dict, optional
Environment variables passed to the kernel
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
cwd : path, optional
The working dir of the kernel process (default: cwd of this process).
**kw: optional
Additional arguments for Popen
Returns
-------
Popen instance for the kernel subprocess
"""
# Popen will fail (sometimes with a deadlock) if stdin, stdout, and stderr
# are invalid. Unfortunately, there is in general no way to detect whether
# they are valid. The following two blocks redirect them to (temporary)
# pipes in certain important cases.
# If this process has been backgrounded, our stdin is invalid. Since there
# is no compelling reason for the kernel to inherit our stdin anyway, we'll
# place this one safe and always redirect.
redirect_in = True
_stdin = PIPE if stdin is None else stdin
# If this process in running on pythonw, we know that stdin, stdout, and
# stderr are all invalid.
redirect_out = sys.executable.endswith("pythonw.exe")
if redirect_out:
blackhole = open(os.devnull, "w")
_stdout = blackhole if stdout is None else stdout
_stderr = blackhole if stderr is None else stderr
else:
_stdout, _stderr = stdout, stderr
env = env if (env is not None) else os.environ.copy()
encoding = getdefaultencoding(prefer_stream=False)
kwargs = kw.copy()
main_args = dict(
stdin=_stdin,
stdout=_stdout,
stderr=_stderr,
cwd=cwd,
env=env,
)
kwargs.update(main_args)
# Spawn a kernel.
if sys.platform == "win32":
# Popen on Python 2 on Windows cannot handle unicode args or cwd
cmd = [cast_bytes_py2(c, encoding) for c in cmd]
if cwd:
cwd = cast_bytes_py2(cwd, sys.getfilesystemencoding() or "ascii")
kwargs["cwd"] = cwd
from .win_interrupt import create_interrupt_event
# Create a Win32 event for interrupting the kernel
# and store it in an environment variable.
interrupt_event = create_interrupt_event()
env["JPY_INTERRUPT_EVENT"] = str(interrupt_event)
# deprecated old env name:
env["IPY_INTERRUPT_EVENT"] = env["JPY_INTERRUPT_EVENT"]
try:
from _winapi import (
DuplicateHandle,
GetCurrentProcess,
DUPLICATE_SAME_ACCESS,
CREATE_NEW_PROCESS_GROUP,
)
except:
from _subprocess import (
DuplicateHandle,
GetCurrentProcess,
DUPLICATE_SAME_ACCESS,
CREATE_NEW_PROCESS_GROUP,
)
# create a handle on the parent to be inherited
if independent:
kwargs["creationflags"] = CREATE_NEW_PROCESS_GROUP
else:
pid = GetCurrentProcess()
handle = DuplicateHandle(
pid,
pid,
pid,
0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS,
)
env["JPY_PARENT_PID"] = str(int(handle))
# Prevent creating new console window on pythonw
if redirect_out:
kwargs["creationflags"] = (kwargs.setdefault("creationflags", 0)
| 0x08000000) # CREATE_NO_WINDOW
# Avoid closing the above parent and interrupt handles.
# close_fds is True by default on Python >=3.7
# or when no stream is captured on Python <3.7
# (we always capture stdin, so this is already False by default on <3.7)
kwargs["close_fds"] = False
else:
# Create a new session.
# This makes it easier to interrupt the kernel,
# because we want to interrupt the whole process group.
# We don't use setpgrp, which is known to cause problems for kernels starting
# certain interactive subprocesses, such as bash -i.
kwargs["start_new_session"] = True
if not independent:
env["JPY_PARENT_PID"] = str(os.getpid())
try:
proc = Popen(cmd, **kwargs)
except Exception as exc:
msg = ("Failed to run command:\n{}\n"
" PATH={!r}\n"
" with kwargs:\n{!r}\n")
# exclude environment variables,
# which may contain access tokens and the like.
without_env = {
key: value
for key, value in kwargs.items() if key != "env"
}
msg = msg.format(cmd, env.get("PATH", os.defpath), without_env)
raise
if sys.platform == "win32":
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
# Clean up pipes created to work around Popen bug.
if redirect_in:
if stdin is None:
proc.stdin.close()
return proc
def run_command(self, command_list, filename, count, log_function):
"""Run command_list count times.
Parameters
----------
command_list : list
A list of args to provide to Popen. Each element of this
list will be interpolated with the filename to convert.
filename : unicode
The name of the file to convert.
count : int
How many times to run the command.
Returns
-------
success : bool
A boolean indicating if the command was successful (True)
or failed (False).
"""
command = [c.format(filename=filename) for c in command_list]
# On windows with python 2.x there is a bug in subprocess.Popen and
# unicode commands are not supported
if sys.platform == 'win32' and sys.version_info < (3, 0):
#We must use cp1252 encoding for calling subprocess.Popen
#Note that sys.stdin.encoding and encoding.DEFAULT_ENCODING
# could be different (cp437 in case of dos console)
command = [c.encode('cp1252') for c in command]
# This will throw a clearer error if the command is not found
cmd = which(command_list[0])
if cmd is None:
raise OSError("%s not found on PATH" % command_list[0])
times = 'time' if count == 1 else 'times'
self.log.info("Running %s %i %s: %s", command_list[0], count, times,
command)
shell = (sys.platform == 'win32')
if shell:
command = subprocess.list2cmdline(command)
env = os.environ.copy()
env['TEXINPUTS'] = os.pathsep.join([
cast_bytes_py2(self.texinputs),
env.get('TEXINPUTS', ''),
])
with open(os.devnull, 'rb') as null:
stdout = subprocess.PIPE if not self.verbose else None
for index in range(count):
p = subprocess.Popen(command,
stdout=stdout,
stderr=subprocess.STDOUT,
stdin=null,
shell=shell,
env=env)
out, _ = p.communicate()
if p.returncode:
if self.verbose:
# verbose means I didn't capture stdout with PIPE,
# so it's already been displayed and `out` is None.
out = u''
else:
out = out.decode('utf-8', 'replace')
log_function(command, out)
self._captured_output.append(out)
return False # failure
return True # success
def __str__(self):
u = self.__unicode__()
return cast_bytes_py2(u)
def launch_kernel(cmd, stdin=None, stdout=None, stderr=None, env=None,
independent=False, cwd=None, **kw):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
cmd : Popen list,
A string of Python code that imports and executes a kernel entry point.
stdin, stdout, stderr : optional (default None)
Standards streams, as defined in subprocess.Popen.
env: dict, optional
Environment variables passed to the kernel
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
cwd : path, optional
The working dir of the kernel process (default: cwd of this process).
**kw: optional
Additional arguments for Popen
Returns
-------
Popen instance for the kernel subprocess
"""
# Popen will fail (sometimes with a deadlock) if stdin, stdout, and stderr
# are invalid. Unfortunately, there is in general no way to detect whether
# they are valid. The following two blocks redirect them to (temporary)
# pipes in certain important cases.
# If this process has been backgrounded, our stdin is invalid. Since there
# is no compelling reason for the kernel to inherit our stdin anyway, we'll
# place this one safe and always redirect.
redirect_in = True
_stdin = PIPE if stdin is None else stdin
# If this process in running on pythonw, we know that stdin, stdout, and
# stderr are all invalid.
redirect_out = sys.executable.endswith('pythonw.exe')
if redirect_out:
blackhole = open(os.devnull, 'w')
_stdout = blackhole if stdout is None else stdout
_stderr = blackhole if stderr is None else stderr
else:
_stdout, _stderr = stdout, stderr
env = env if (env is not None) else os.environ.copy()
encoding = getdefaultencoding(prefer_stream=False)
kwargs = kw.copy()
main_args = dict(
stdin=_stdin,
stdout=_stdout,
stderr=_stderr,
cwd=cwd,
env=env,
)
kwargs.update(main_args)
# Spawn a kernel.
if sys.platform == 'win32':
# Popen on Python 2 on Windows cannot handle unicode args or cwd
cmd = [ cast_bytes_py2(c, encoding) for c in cmd ]
if cwd:
cwd = cast_bytes_py2(cwd, sys.getfilesystemencoding() or 'ascii')
kwargs['cwd'] = cwd
from .win_interrupt import create_interrupt_event
# Create a Win32 event for interrupting the kernel
# and store it in an environment variable.
interrupt_event = create_interrupt_event()
env["JPY_INTERRUPT_EVENT"] = str(interrupt_event)
# deprecated old env name:
env["IPY_INTERRUPT_EVENT"] = env["JPY_INTERRUPT_EVENT"]
try:
from _winapi import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS, CREATE_NEW_PROCESS_GROUP
except:
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS, CREATE_NEW_PROCESS_GROUP
# create a handle on the parent to be inherited
if independent:
kwargs['creationflags'] = CREATE_NEW_PROCESS_GROUP
else:
pid = GetCurrentProcess()
handle = DuplicateHandle(pid, pid, pid, 0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
env['JPY_PARENT_PID'] = str(int(handle))
# Prevent creating new console window on pythonw
if redirect_out:
kwargs['creationflags'] = kwargs.setdefault('creationflags', 0) | 0x08000000 # CREATE_NO_WINDOW
# Avoid closing the above parent and interrupt handles.
# close_fds is True by default on Python >=3.7
# or when no stream is captured on Python <3.7
# (we always capture stdin, so this is already False by default on <3.7)
kwargs['close_fds'] = False
else:
# Create a new session.
# This makes it easier to interrupt the kernel,
# because we want to interrupt the whole process group.
# We don't use setpgrp, which is known to cause problems for kernels starting
# certain interactive subprocesses, such as bash -i.
if PY3:
kwargs['start_new_session'] = True
else:
kwargs['preexec_fn'] = lambda: os.setsid()
if not independent:
env['JPY_PARENT_PID'] = str(os.getpid())
try:
proc = Popen(cmd, **kwargs)
except Exception as exc:
msg = (
"Failed to run command:\n{}\n"
" PATH={!r}\n"
" with kwargs:\n{!r}\n"
)
# exclude environment variables,
# which may contain access tokens and the like.
without_env = {key:value for key, value in kwargs.items() if key != 'env'}
msg = msg.format(cmd, env.get('PATH', os.defpath), without_env)
get_logger().error(msg)
raise
if sys.platform == 'win32':
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
# Clean up pipes created to work around Popen bug.
if redirect_in:
if stdin is None:
proc.stdin.close()
return proc
def __str__(self):
u = self.__unicode__()
return cast_bytes_py2(u)
def build_popen_kwargs(self, connection_file):
"""Build a dictionary of arguments to pass to Popen"""
kwargs = {}
# Popen will fail (sometimes with a deadlock) if stdin, stdout, and stderr
# are invalid. Unfortunately, there is in general no way to detect whether
# they are valid. The following two blocks redirect them to (temporary)
# pipes in certain important cases.
# If this process has been backgrounded, our stdin is invalid. Since there
# is no compelling reason for the kernel to inherit our stdin anyway, we'll
# place this one safe and always redirect.
kwargs['stdin'] = PIPE
# If this process in running on pythonw, we know that stdin, stdout, and
# stderr are all invalid.
redirect_out = sys.executable.endswith('pythonw.exe')
if redirect_out:
kwargs['stdout'] = kwargs['stderr'] = open(os.devnull, 'w')
cmd = self.format_kernel_cmd(connection_file)
kwargs['env'] = env = os.environ.copy()
# Don't allow PYTHONEXECUTABLE to be passed to kernel process.
# If set, it can bork all the things.
env.pop('PYTHONEXECUTABLE', None)
if self.extra_env:
env.update(self.extra_env)
# TODO: where is this used?
independent = False
if sys.platform == 'win32':
# Popen on Python 2 on Windows cannot handle unicode args or cwd
encoding = getdefaultencoding(prefer_stream=False)
kwargs['args'] = [cast_bytes_py2(c, encoding) for c in cmd]
if self.cwd:
kwargs['cwd'] = cast_bytes_py2(
self.cwd,
sys.getfilesystemencoding() or 'ascii')
try:
# noinspection PyUnresolvedReferences
from _winapi import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS, CREATE_NEW_PROCESS_GROUP
except:
# noinspection PyUnresolvedReferences
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS, CREATE_NEW_PROCESS_GROUP
# Launch the kernel process
if independent:
kwargs['creationflags'] = CREATE_NEW_PROCESS_GROUP
else:
pid = GetCurrentProcess()
handle = DuplicateHandle(
pid,
pid,
pid,
0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
env['JPY_PARENT_PID'] = str(int(handle))
else:
kwargs['args'] = cmd
kwargs['cwd'] = self.cwd
# Create a new session.
# This makes it easier to interrupt the kernel,
# because we want to interrupt the whole process group.
# We don't use setpgrp, which is known to cause problems for kernels starting
# certain interactive subprocesses, such as bash -i.
if six.PY3:
kwargs['start_new_session'] = True
else:
kwargs['preexec_fn'] = lambda: os.setsid()
if not independent:
env['JPY_PARENT_PID'] = str(os.getpid())
return kwargs
def launch_kernel(cmd, stdin=None, stdout=None, stderr=None, env=None,
independent=False,
cwd=None,
**kw
):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
cmd : Popen list,
A string of Python code that imports and executes a kernel entry point.
stdin, stdout, stderr : optional (default None)
Standards streams, as defined in subprocess.Popen.
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
cwd : path, optional
The working dir of the kernel process (default: cwd of this process).
Returns
-------
Popen instance for the kernel subprocess
"""
# Popen will fail (sometimes with a deadlock) if stdin, stdout, and stderr
# are invalid. Unfortunately, there is in general no way to detect whether
# they are valid. The following two blocks redirect them to (temporary)
# pipes in certain important cases.
# If this process has been backgrounded, our stdin is invalid. Since there
# is no compelling reason for the kernel to inherit our stdin anyway, we'll
# place this one safe and always redirect.
redirect_in = True
_stdin = PIPE if stdin is None else stdin
# If this process in running on pythonw, we know that stdin, stdout, and
# stderr are all invalid.
redirect_out = sys.executable.endswith('pythonw.exe')
if redirect_out:
blackhole = open(os.devnull, 'w')
_stdout = blackhole if stdout is None else stdout
_stderr = blackhole if stderr is None else stderr
else:
_stdout, _stderr = stdout, stderr
env = env if (env is not None) else os.environ.copy()
encoding = getdefaultencoding(prefer_stream=False)
kwargs = dict(
stdin=_stdin,
stdout=_stdout,
stderr=_stderr,
cwd=cwd,
env=env,
)
# Spawn a kernel.
if sys.platform == 'win32':
# Popen on Python 2 on Windows cannot handle unicode args or cwd
cmd = [ cast_bytes_py2(c, encoding) for c in cmd ]
if cwd:
cwd = cast_bytes_py2(cwd, sys.getfilesystemencoding() or 'ascii')
kwargs['cwd'] = cwd
from .win_interrupt import create_interrupt_event
# Create a Win32 event for interrupting the kernel
# and store it in an environment variable.
interrupt_event = create_interrupt_event()
env["JPY_INTERRUPT_EVENT"] = str(interrupt_event)
# deprecated old env name:
env["IPY_INTERRUPT_EVENT"] = env["JPY_INTERRUPT_EVENT"]
try:
from _winapi import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS, CREATE_NEW_PROCESS_GROUP
except:
from _subprocess import DuplicateHandle, GetCurrentProcess, \
DUPLICATE_SAME_ACCESS, CREATE_NEW_PROCESS_GROUP
# Launch the kernel process
if independent:
kwargs['creationflags'] = CREATE_NEW_PROCESS_GROUP
else:
pid = GetCurrentProcess()
handle = DuplicateHandle(pid, pid, pid, 0,
True, # Inheritable by new processes.
DUPLICATE_SAME_ACCESS)
env['JPY_PARENT_PID'] = str(int(handle))
proc = Popen(cmd, **kwargs)
# Attach the interrupt event to the Popen objet so it can be used later.
proc.win32_interrupt_event = interrupt_event
else:
if independent:
kwargs['preexec_fn'] = lambda: os.setsid()
else:
env['JPY_PARENT_PID'] = str(os.getpid())
proc = Popen(cmd, **kwargs)
# Clean up pipes created to work around Popen bug.
if redirect_in:
if stdin is None:
proc.stdin.close()
return proc