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#!/usr/bin/env python2
import subprocess
import time
import os
import sys
import signal
class logger:
socketname=''
readytolaunch=False
mountlist=["/dev/","/dev/pts","/dev/shm","/proc/","/sys/"]
rootmountpath="/mnt/logfs_root_"+str(time.time())+"/"
currpid=-1
# rootmountpath="/mnt/logfs_roott_"+"/"
def __init__(self, socketname, accuracy=False):
if os.geteuid() != 0:
print "only root user can use FUSE approach for logging"
exit(1)
self.socketname=socketname
self.currpid=os.getpid()
if accuracy==False:
self.mountlist=self.mountlist+["/lib64/", "/lib32/","/var/tmp/portage/"]
print "mounting root filesystem into %s. External access to this folder will be blocked. Please, DON'T DELETE THIS FOLDER !!" % self.rootmountpath
try:
os.mkdir(self.rootmountpath)
except OSError,e:
if e.errno==17: # 17 is a "file exists" errno
pass # all is ok
else:
print "failed to make mount directory %s: %s" % (self.rootmountpath,e)
print "this error is fatal"
exit(1)
ret=subprocess.call(['mount','-o','bind','/',self.rootmountpath])
if ret!=0:
print "failed to bind root filesystem to %s. Check messages above"%self.rootmountpath
exit(1)
os.environ["LOG_SOCKET"]=self.socketname
os.environ["PARENT_PID"]=str(self.currpid)
# TODO: change
ret=subprocess.call(['/home/bay/gsoc/src/hook_fusefs/hookfs',self.rootmountpath,
'-o','allow_other,suid'])
if ret!=0:
print "failed to launch FUSE logger. Check messages above"
exit(1)
for mount in self.mountlist:
if not os.path.exists(mount):
continue
ret=subprocess.call(['mount','-o','bind',mount,self.rootmountpath+mount])
if ret!=0:
print "failed to mount bind %s directory to %s. Check messages above" % (
mount,self.rootmountpath)
exit(1)
self.readytolaunch=True;
def __del__(self):
#we will delete the object manually after execprog
pass
# launches command, if it returns not 0 waits for 1 or 2 second and launches again
# for various umounts
def smartcommandlauncher(self,args):
for waittime in (1,1,2):
ret=subprocess.call(args)
if ret==0:
return
print "Auto-retrying after %d sec" % waittime
time.sleep(waittime)
print "Giving up. Command %s failed" % args
def execprog(self,prog_name,arguments):
if self.currpid!=os.getpid():
print "Detected an attempt to execute execproc in other thread"
sys.exit(1)
pid=os.fork()
if pid==0:
try:
cwd=os.getcwd()
os.chroot(self.rootmountpath)
os.chdir(cwd)
env=os.environ.copy()
env["LOGGER_PROCESS_IS_INTERNAL"]="YES"
os.execvpe(prog_name, arguments, env)
sys.exit(1)
except OSError, e:
print "Error while chrooting and starting a program: %s" % e
sys.exit(1)
else:
exitcode=2; # if ctrl-c pressed then returning this value
needtokillself=False
try:
exitcode=os.wait()[1]/256;
except KeyboardInterrupt:
needtokillself=True
try:
print "Unmounting partitions"
self.mountlist.reverse()
for mount in self.mountlist:
if not os.path.exists(self.rootmountpath+mount):
continue
self.smartcommandlauncher(['umount','-l',self.rootmountpath+mount])
self.smartcommandlauncher(['fusermount','-z','-u',self.rootmountpath]);
self.smartcommandlauncher(['umount','-l',self.rootmountpath]);
os.rmdir(self.rootmountpath)
except OSError, e:
print "Error while unmounting fuse filesystem: %s" % e
sys.exit(1)
if needtokillself: # we kill self for report the status correct
signal.signal(signal.SIGINT,signal.SIG_DFL)
os.kill(os.getpid(),signal.SIGINT)
os._exit(exitcode)
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