def _fork(self):
try:
ret = os.fork()
if ret > 0:
# Exit the parent process
os._exit(0)
except OSError as e:
raise exception.DetachProcessError(error=e)
def _fork(self, parent_exits):
try:
pid = os.fork()
if pid > 0 and parent_exits:
os._exit(0)
return pid
except OSError as e:
raise exception.DetachProcessError(error=e)
def _change_file_creation_mask(self):
"""Set the umask for new files.
Set the umask for new files the process creates so that it does
have complete control over the permissions of them. We don't
know what umask we may have inherited.
"""
try:
os.umask(0)
except Exception as e:
error = ('Failed to change file creation mask. Error: %s' % e)
raise exception.DetachProcessError(error=error)
def _change_root_directory(self):
"""Change to root directory.
Ensure that our process doesn't keep any directory in use. Failure
to do this could make it so that an administrator couldn't
unmount a filesystem, because it was our current directory.
"""
try:
os.chdir('/')
except Exception as e:
error = ('Failed to change root directory. Error: %s' % e)
raise exception.DetachProcessError(error=error)