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#!/usr/bin/env python3
from __future__ import print_function
import argparse
import fcntl
import os
import pwd
import select
import signal
import sys
import syslog
from subprocess import Popen, PIPE, STDOUT
from pipes import quote
VERSION = '1.6.1'
def is_root():
return os.getuid() == 0
def _get_users(config):
config_lines = list()
if os.path.exists(config):
with open(config, 'r') as config_file:
for raw_line in config_file:
line = raw_line.strip()
if line == '' or line.startswith('#'):
continue
config_lines.append(line.strip())
users = list()
for user in pwd.getpwall():
if user.pw_uid < 1000 or user.pw_uid >= 2000:
if user.pw_name not in config_lines:
continue
elif '!' + user.pw_name in config_lines:
continue
users.append(user)
return users
class Executor(Popen):
def __init__(self, *args, **kwargs):
self.running = True
self.orig_signal = signal.signal(signal.SIGCHLD, self._signal)
return super(Executor, self).__init__(*args, **kwargs)
def readlines(self):
fl = fcntl.fcntl(self.stdout, fcntl.F_GETFL)
fcntl.fcntl(self.stdout, fcntl.F_SETFL, fl | os.O_NONBLOCK)
buffer = ''
while self.running:
try:
ready = select.select([self.stdout], [], [], 0)
except select.error:
pass
if ready[0] != []:
buffer += self.stdout.read(8192).decode('utf-8')
lines = buffer.splitlines()
for line in lines[:-1]:
yield line
if len(lines) > 0:
buffer = lines[-1]
self.wait()
try:
buffer += self.stdout.read(8192).decode('utf-8')
except:
pass
for line in buffer.splitlines():
yield line
def wait(self):
result = super(Executor, self).wait()
signal.signal(signal.SIGCHLD, self.orig_signal)
return result
def _signal(self, *args):
self.running = False
class SplineStartup(object):
def __init__(self):
self.options = None
self._parse_args()
if self.options.syslog:
syslog.openlog(logoption=syslog.LOG_PID)
def _parse_args(self):
parser = argparse.ArgumentParser(description='Startup for users.')
parser.add_argument('actions', metavar='ACTION', nargs='*',
default=['start'],
help='argument supplied to each called '
'script, if multiple arguments are given '
'each script is called with each argument '
'until the first one exits with return code '
'0 (default: %(default)s)')
parser.add_argument('-q', '--quiet', action='store_true',
help='only log error messages')
parser.add_argument('-v', '--verbose', action='store_true',
help='print extra debugging mesasges to stderr')
parser.add_argument('-V', '--version', action='version',
version='%(prog)s ' + VERSION)
parser.add_argument('-n', '--dry-run', action='store_true',
help="print script names which would run, "
"but don't run them")
parser.add_argument('-s', '--syslog', action='store_true',
help='log to syslog and not to stderr')
if is_root():
parser.add_argument('-u', '--user', metavar='USER',
action='append',
help='user to execute scripts (by default all '
'users with 1000 <= uid < 2000 are used)')
parser.add_argument('-c', '--config', metavar='CONFIG',
help='path to config file for additional users',
default='/etc/spline-startup.conf')
self.options = parser.parse_args()
def _perror(self, msg):
if self.options.syslog:
syslog.syslog(syslog.LOG_CRIT, msg)
else:
print('[ERROR] %s' % msg, file=sys.stderr)
def _pinfo(self, msg):
if self.options.syslog:
syslog.syslog(syslog.LOG_INFO, msg)
elif not self.options.quiet:
print('[INFO] %s' % msg, file=sys.stderr)
def _pdebug(self, msg):
if self.options.syslog:
syslog.syslog(syslog.LOG_DEBUG, msg)
elif self.options.verbose:
print('[DEBUG] %s' % msg, file=sys.stderr)
def _call(self, cmd):
self._pinfo('Calling: %s' % ' '.join(cmd))
if not self.options.dry_run:
proc = Executor(cmd, stdout=PIPE, stderr=STDOUT)
for line in proc.readlines():
self._pinfo(line)
return proc.returncode
else:
return 0
def _get_scripts(self, reverse, directory):
args = []
if reverse:
args.append('--reverse')
cmd = ['run-parts', '--list', '--regex', '^[a-zA-Z0-9_.-]+$'] + \
args + ['--', directory]
self._pinfo('Getting scripts: %s' % ' '.join(cmd))
proc = Popen(cmd, stdout=PIPE, stderr=STDOUT)
output, _ = proc.communicate()
return output.strip().decode('utf-8').splitlines()
def _run_scripts(self, user, actions, use_su=True):
self._pdebug("Running scripts for user '%s'" % user.pw_name)
directory = os.path.join(user.pw_dir, 'etc', 'rc.d')
if not os.path.isdir(directory):
return True
scripts = self._get_scripts(actions[0] == 'stop', directory)
self._pinfo('Running scripts: %r' % scripts)
error = False
for script in scripts:
for action in actions:
if use_su:
exitcode = self._call(['su', '-', user.pw_name,
'-s', '/bin/sh',
'-c', '%s %s' % (quote(script),
quote(action))])
else:
exitcode = self._call([script, action])
if exitcode == 0:
break
if exitcode != 0:
error = True
return error == False
def run(self):
if not is_root():
user = pwd.getpwuid(os.getuid())
self._run_scripts(user, self.options.actions, False)
return
if self.options.user is not None:
for username in self.options.user:
try:
user = pwd.getpwnam(username)
self._run_scripts(user, self.options.actions)
except KeyError:
self._perror("Invalid user '%s'" % username)
else:
userlist = _get_users(self.options.config)
for user in userlist:
self._run_scripts(user, self.options.actions)
def main():
signal.signal(signal.SIGCHLD, signal.SIG_IGN)
app = SplineStartup()
app.run()
if __name__ == '__main__':
main()
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