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Make service module daemonize for all the broken "daemons" out there

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This commit is contained in:
Daniel Hokka Zakrisson 2013-01-22 19:33:39 +01:00
parent 94a1c221bc
commit d4c0180494
1 changed files with 78 additions and 6 deletions
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84
library/service
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@ -74,6 +74,7 @@ import platform
import os
import tempfile
import shlex
import select
class Service(object):
"""
@ -134,12 +135,83 @@ class Service(object):
# ===========================================
# Generic methods that should be used on all platforms.
def execute_command(self, cmd):
def execute_command(self, cmd, daemonize=False):
if self.syslogging:
syslog.openlog('ansible-%s' % os.path.basename(__file__))
syslog.syslog(syslog.LOG_NOTICE, 'Command %s' % '|'.join(cmd))
syslog.syslog(syslog.LOG_NOTICE, 'Command %s, daemonize %r' % (cmd, daemonize))
return self.module.run_command(cmd)
# Most things don't need to be daemonized
if not daemonize:
return self.module.run_command(cmd)
# This is complex because daemonization is hard for people.
# What we do is daemonize a part of this module, the daemon runs the
# command, picks up the return code and output, and returns it to the
# main process.
pipe = os.pipe()
pid = os.fork()
if pid == 0:
os.close(pipe[0])
# Set stdin/stdout/stderr to /dev/null
fd = os.open(os.devnull, os.O_RDWR)
if fd != 0:
os.dup2(fd, 0)
if fd != 1:
os.dup2(fd, 1)
if fd != 2:
os.dup2(fd, 2)
if fd not in (0, 1, 2):
os.close(fd)
# Make us a daemon. Yes, that's all it takes.
pid = os.fork()
if pid > 0:
os._exit(0)
os.setsid()
os.chdir("/")
pid = os.fork()
if pid > 0:
os._exit(0)
# Start the command
p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, preexec_fn=lambda: os.close(pipe[1]))
stdout = ""
stderr = ""
fds = [p.stdout, p.stderr]
# Wait for all output, or until the main process is dead and its output is done.
while fds:
rfd, wfd, efd = select.select(fds, [], fds, 1)
if not (rfd + wfd + efd) and p.poll() is not None:
break
if p.stdout in rfd:
dat = os.read(p.stdout.fileno(), 4096)
if not dat:
fds.remove(p.stdout)
if p.stderr in rfd:
dat = os.read(p.stderr.fileno(), 4096)
if not dat:
fds.remove(p.stderr)
stderr += dat
p.wait()
# Return a JSON blob to parent
os.write(pipe[1], json.dumps([p.returncode, stdout, stderr]))
os.close(pipe[1])
os._exit(0)
elif pid == -1:
self.module.fail_json(msg="unable to fork")
else:
os.close(pipe[1])
os.waitpid(pid, 0)
# Wait for data from daemon process and process it.
data = ""
while True:
rfd, wfd, efd = select.select([pipe[0]], [], [pipe[0]])
if pipe[0] in rfd:
dat = os.read(pipe[0], 4096)
if not dat:
break
data += dat
return json.loads(data)
def check_ps(self):
# Set ps flags
@ -378,10 +450,10 @@ class LinuxService(Service):
svc_cmd = "%s" % self.svc_initscript
if self.action is not "restart":
rc_state, stdout, stderr = self.execute_command("%s %s %s" % (svc_cmd, self.action, self.arguments))
rc_state, stdout, stderr = self.execute_command("%s %s %s" % (svc_cmd, self.action, self.arguments), daemonize=True)
else:
rc1, stdout1, stderr1 = self.execute_command("%s %s %s" % (svc_cmd, 'stop', self.arguments))
rc2, stdout2, stderr2 = self.execute_command("%s %s %s" % (svc_cmd, 'start', self.arguments))
rc1, stdout1, stderr1 = self.execute_command("%s %s %s" % (svc_cmd, 'stop', self.arguments), daemonize=True)
rc2, stdout2, stderr2 = self.execute_command("%s %s %s" % (svc_cmd, 'start', self.arguments), daemonize=True)
if rc1 != 0 and rc2 == 0:
rc_state = rc2
stdout = stdout2