"""A few things that didn't seem to fit anywhere else."""
-import cPickle
-import errno
import os
import pwd
import tempfile
-import threading
import fcntl
-import commands
+import errno
+import threading
+import subprocess
+
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"
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._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."""
other_pid = None
finally: f.close()
return temporary_filename
+# replace a target file with a new contents - checks for changes
+# return True if a change occurred, in which case
+# chown/chmod settings should be taken care of
+def replace_file_with_string (target, new_contents):
+ try:
+ current=file(target).read()
+ except:
+ current=""
+ # xxx if verbose, report diffs...
+ if current==new_contents:
+ return False
+ # overwrite target file
+ f=file(target,'w')
+ f.write(new_contents)
+ f.close()
+ return True
+
+# not needed yet - should that unlink the new file ?
+#def replace_file_with_file (target, new):
+# return replace_file_with_string (target, file(new).read())
+
+####################
# utilities functions to get (cached) information from the node
# get node_id from /etc/planetlab/node_id and cache it
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("tools: Lock %s initialized." % file, 2)