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