Simplify lxcsu by querying libvirt for pid

—
this is a manual re-injection of Sapan’s change
it was a big mistake to reindent automatically as this broke the logic entirely

diff --git a/lxcsu b/lxcsu
index 090cea1..eb3c5ce 100755 (executable)
--- a/lxcsu
+++ b/lxcsu
@@ -84,43 +84,17 @@ def main ():
                debug=True
 
        try:
-               cmd = 'grep %s /proc/*/cgroup | grep freezer'%slice_name
-               output = os.popen(cmd).readlines()
+               cmd = '/usr/bin/virsh domid %s'%slice_name
+               pidnum = int(os.popen(cmd).read().rstrip())
        except:
                print "Error finding slice %s"%slice_name
                exit(1)
 
-       slice_spec = None
+        pid = '%s'%pidnum
+        cmdline = open('/proc/%s/cmdline'%pidnum).read().rstrip('\n\x00')
+        arch = getarch('/proc/%s/exe'%pid)
 
-       # provide a default as this is not always properly computed
-       arch = None
-
-       for e in output:
-               try:
-                       l = e.rstrip()
-                       path = l.split(':')[0]  
-                       comp = l.rsplit(':')[-1]
-                       slice_name_check = comp.rsplit('/')[-1]
-                       if debug: print "dealing with >%s<"%slice_name_check
-                       
-                       if (slice_name_check == slice_name):
-                               if debug: print "found %s"%slice_name
-                               slice_path = path
-                               pid = slice_path.split('/')[2]
-                               cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00')
-                               if (cmdline == '/sbin/init') or (cmdline.startswith("init [")):
-                                       slice_spec = slice_path
-                                       arch = getarch('/proc/%s/exe'%pid)
-                                       break
-               except Exception,e:
-                       if debug: 
-                               import traceback
-                               print "BEG lxcsu - ignoring exception"
-                               traceback.print_exc()
-                               print "END lxcsu - ignoring exception"
-                       pass
-
-       if (not slice_spec or not pid):
+       if (not pid):
                print "Not started: %s"%slice_name
                exit(1)