125 lines
3.5 KiB
Python
125 lines
3.5 KiB
Python
import errno
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import fcntl
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import getpass
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import os
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import re
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import select
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import subprocess
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import sys
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from django.core.management.base import CommandError
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def check_root(func):
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""" Function decorator that checks if user has root permissions """
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def wrapped(*args, **kwargs):
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if getpass.getuser() != 'root':
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cmd_name = func.__module__.split('.')[-1]
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msg = "Sorry, '%s' must be executed as a superuser (root)"
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raise CommandError(msg % cmd_name)
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return func(*args, **kwargs)
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return wrapped
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class _AttributeString(str):
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""" Simple string subclass to allow arbitrary attribute access. """
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@property
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def stdout(self):
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return str(self)
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def make_async(fd):
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""" Helper function to add the O_NONBLOCK flag to a file descriptor """
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fcntl.fcntl(fd, fcntl.F_SETFL, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
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def read_async(fd):
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"""
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Helper function to read some data from a file descriptor, ignoring EAGAIN errors
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"""
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try:
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return fd.read()
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except IOError, e:
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if e.errno != errno.EAGAIN:
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raise e
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else:
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return ''
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def run(command, display=True, error_codes=[0], silent=False, stdin=''):
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""" Subprocess wrapper for running commands """
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if display:
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sys.stderr.write("\n\033[1m $ %s\033[0m\n" % command)
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p = subprocess.Popen(command, shell=True, executable='/bin/bash',
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stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
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p.stdin.write(stdin)
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p.stdin.close()
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make_async(p.stdout)
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make_async(p.stderr)
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stdout = str()
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stderr = str()
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# Async reading of stdout and sterr
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while True:
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# Wait for data to become available
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select.select([p.stdout, p.stderr], [], [])
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# Try reading some data from each
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stdoutPiece = read_async(p.stdout)
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stderrPiece = read_async(p.stderr)
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if display and stdoutPiece:
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sys.stdout.write(stdoutPiece)
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if display and stderrPiece:
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sys.stderr.write(stderrPiece)
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stdout += stdoutPiece
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stderr += stderrPiece
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returnCode = p.poll()
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if returnCode != None:
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break
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out = _AttributeString(stdout.strip())
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err = _AttributeString(stderr.strip())
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p.stdout.close()
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p.stderr.close()
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out.failed = False
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out.return_code = returnCode
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out.stderr = err
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if p.returncode not in error_codes:
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out.failed = True
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msg = "\nrun() encountered an error (return code %s) while executing '%s'\n"
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msg = msg % (p.returncode, command)
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if display:
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sys.stderr.write("\n\033[1;31mCommandError: %s %s\033[m\n" % (msg, err))
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if not silent:
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raise CommandError("%s %s %s" % (msg, err, out))
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out.succeeded = not out.failed
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return out
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def sshrun(addr, command, *args, **kwargs):
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cmd = "ssh -o stricthostkeychecking=no root@%s -C '%s'" % (addr, command)
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return run(cmd, *args, **kwargs)
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def get_default_celeryd_username():
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""" Introspect celeryd defaults file in order to get its username """
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user = None
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try:
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with open('/etc/default/celeryd') as celeryd_defaults:
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for line in celeryd_defaults.readlines():
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if 'CELERYD_USER=' in line:
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user = re.findall('"([^"]*)"', line)[0]
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finally:
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if user is None:
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raise CommandError("Can not find the default celeryd username")
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return user
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