+# $Id$
+# $URL$
+
"""A few things that didn't seem to fit anywhere else."""
import cPickle
import pwd
import tempfile
import threading
-
+import fcntl
+import commands
import logger
-
PID_FILE = '/var/run/nm.pid'
+def get_default_if():
+ interface = get_if_from_hwaddr(get_hwaddr_from_plnode())
+ if not interface: interface = "eth0"
+ return interface
+
+def get_hwaddr_from_plnode():
+ try:
+ for line in open("/usr/boot/plnode.txt", 'r').readlines():
+ if line.startswith("NET_DEVICE"):
+ return line.split("=")[1].strip().strip('"')
+ except:
+ pass
+ return None
+
+def get_if_from_hwaddr(hwaddr):
+ import sioc
+ devs = sioc.gifconf()
+ for dev in devs:
+ dev_hwaddr = sioc.gifhwaddr(dev)
+ if dev_hwaddr == hwaddr: return dev
+ return None
+
def as_daemon_thread(run):
"""Call function <run> with no arguments in its own thread."""
thr = threading.Thread(target=run)
os.umask(0)
devnull = os.open(os.devnull, os.O_RDWR)
os.dup2(devnull, 0)
- crashlog = os.open('/root/nm.stderr', os.O_RDWR | os.O_APPEND | os.O_CREAT, 0644)
+ # 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)
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)
try: do_write(f)
finally: f.close()
return temporary_filename
+
+# utilities functions to get (cached) information from the node
+
+# get node_id from /etc/planetlab/node_id and cache it
+_node_id=None
+def node_id():
+ global _node_id
+ if _node_id is None:
+ try:
+ _node_id=int(file("/etc/planetlab/node_id").read())
+ except:
+ _node_id=""
+ return _node_id
+
+_root_context_arch=None
+def root_context_arch():
+ global _root_context_arch
+ if not _root_context_arch:
+ _root_context_arch=commands.getoutput("uname -i")
+ return _root_context_arch
+
+
+class NMLock:
+ def __init__(self, file):
+ 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
+ fcntl.fcntl(self.fd, fcntl.F_SETFD, flags)
+ def __del__(self):
+ os.close(self.fd)
+ def acquire(self):
+ logger.log("tools: Lock acquired.", 2)
+ fcntl.lockf(self.fd, fcntl.LOCK_SH)
+ def release(self):
+ logger.log("tools: Lock released.", 2)
+ fcntl.lockf(self.fd, fcntl.LOCK_UN)