+# $Id$
+# $URL$
+
"""A few things that didn't seem to fit anywhere else."""
-import cPickle
-import errno
-import os
+import os, os.path
import pwd
import tempfile
-import threading
import fcntl
-import commands
+import errno
+import threading
+import subprocess
+
import logger
-PID_FILE = '/var/run/nm.pid'
+PID_FILE = '/var/run/nodemanager.pid'
+####################
def get_default_if():
interface = get_if_from_hwaddr(get_hwaddr_from_plnode())
if not interface: interface = "eth0"
if dev_hwaddr == hwaddr: return dev
return None
+####################
+# daemonizing
def as_daemon_thread(run):
"""Call function <run> with no arguments in its own thread."""
thr = threading.Thread(target=run)
os.setsid()
if os.fork() != 0: os._exit(0)
os.chdir('/')
- os.umask(0)
+ os.umask(0022)
devnull = os.open(os.devnull, os.O_RDWR)
os.dup2(devnull, 0)
# xxx fixme - this is just to make sure that nothing gets stupidly lost - should use devnull
- crashlog = os.open('/var/log/nm.daemon', os.O_RDWR | os.O_APPEND | os.O_CREAT, 0644)
+ crashlog = os.open('/var/log/nodemanager.daemon', os.O_RDWR | os.O_APPEND | os.O_CREAT, 0644)
os.dup2(crashlog, 1)
os.dup2(crashlog, 2)
except:
os.seteuid(os.getuid()) # undo su so we can write the log file
os.setegid(os.getgid())
- logger.log_exc()
+ logger.log_exc("tools: fork_as")
os._exit(0)
else: os.waitpid(child_pid, 0)
+####################
+# manage files
def pid_file():
- """We use a pid file to ensure that only one copy of NM is running at a given time. If successful, this function will write a pid file containing the pid of the current process. The return value is the pid of the other running process, or None otherwise."""
+ """We use a pid file to ensure that only one copy of NM is running at a given time.
+If successful, this function will write a pid file containing the pid of the current process.
+The return value is the pid of the other running process, or None otherwise."""
other_pid = None
if os.access(PID_FILE, os.F_OK): # check for a pid file
handle = open(PID_FILE) # pid file exists, read it
finally: f.close()
return temporary_filename
+# replace a target file with a new contents - checks for changes
+# can handle chmod if requested
+# can also remove resulting file if contents are void, if requested
+# performs atomically:
+# writes in a tmp file, which is then renamed (from sliverauth originally)
+# returns True if a change occurred, or the file is deleted
+def replace_file_with_string (target, new_contents, chmod=None, remove_if_empty=False):
+ try:
+ current=file(target).read()
+ except:
+ current=""
+ if current==new_contents:
+ # if turns out to be an empty string, and remove_if_empty is set,
+ # then make sure to trash the file if it exists
+ if remove_if_empty and not new_contents and os.path.isfile(target):
+ logger.verbose("tools.replace_file_with_string: removing file %s"%target)
+ try: os.unlink(target)
+ finally: return True
+ return False
+ # overwrite target file: create a temp in the same directory
+ path=os.path.dirname(target) or '.'
+ fd, name = tempfile.mkstemp('','repl',path)
+ os.write(fd,new_contents)
+ os.close(fd)
+ if os.path.exists(target):
+ os.unlink(target)
+ os.rename(name,target)
+ if chmod: os.chmod(target,chmod)
+ return True
+
+
+####################
# utilities functions to get (cached) information from the node
# get node_id from /etc/planetlab/node_id and cache it
_node_id=""
return _node_id
-# get slicefamily from /etc/planetlab/slicefamily and cache it
-# http://svn.planet-lab.org/wiki/SliceFamily
-_slicefamily=None
-def slicefamily():
- global _slicefamily
- if _slicefamily is None:
- try:
- _slicefamily=file("/etc/planetlab/slicefamily").read().strip()
- except:
- _slicefamily=""
- return _slicefamily
-
_root_context_arch=None
def root_context_arch():
global _root_context_arch
if not _root_context_arch:
- _root_context_arch=commands.getoutput("uname -i")
+ sp=subprocess.Popen(["uname","-i"],stdout=subprocess.PIPE)
+ (_root_context_arch,_)=sp.communicate()
+ _root_context_arch=_root_context_arch.strip()
return _root_context_arch
+####################
class NMLock:
def __init__(self, file):
- logger.log("Lock %s initialized." % file, 2)
+ logger.log("tools: Lock %s initialized." % file, 2)
self.fd = os.open(file, os.O_RDWR|os.O_CREAT, 0600)
flags = fcntl.fcntl(self.fd, fcntl.F_GETFD)
flags |= fcntl.FD_CLOEXEC
def __del__(self):
os.close(self.fd)
def acquire(self):
- logger.log("Lock acquired.", 2)
+ logger.log("tools: Lock acquired.", 2)
fcntl.lockf(self.fd, fcntl.LOCK_SH)
def release(self):
- logger.log("Lock released.", 2)
+ logger.log("tools: Lock released.", 2)
fcntl.lockf(self.fd, fcntl.LOCK_UN)
git://git.onelab.eu / nodemanager.git / blobdiff