X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=python%2Fvserver.py;h=b621e4c6602eaf7bac11a0c98f5cda5292059e55;hb=da4283f4995283be5020e58eaf7fb02d014a07da;hp=32f27adc0dbadf76fa4ccbdba801fc3fadb43a6f;hpb=e33814b72dc77e690941742fe82920cab9376799;p=util-vserver.git

diff --git a/python/vserver.py b/python/vserver.py
index 32f27ad..b621e4c 100644
--- a/python/vserver.py
+++ b/python/vserver.py
@@ -1,6 +1,6 @@
 # Copyright 2005 Princeton University
 
-#$Id: vserver.py,v 1.66 2007/07/31 16:31:04 dhozac Exp $
+#$Id: vserver.py,v 1.71 2007/08/02 15:26:42 dhozac Exp $
 
 import errno
 import fcntl
@@ -61,20 +61,30 @@ class VServerConfig:
     def __init__(self, name, directory):
         self.name = name
         self.dir = directory
+        self.cache = None
+        if not (os.path.isdir(self.dir) and
+                os.access(self.dir, os.R_OK | os.W_OK | os.X_OK)):
+            raise NoSuchVServer, "%s does not exist" % self.dir
 
     def get(self, option, default = None):
         try:
-            f = open(os.path.join(self.dir, option), "r")
-            buf = f.readline().rstrip()
-            f.close()
-            return buf
-        except IOError, e:
+            if self.cache:
+                return self.cache[option]
+            else:
+                f = open(os.path.join(self.dir, option), "r")
+                buf = f.read().rstrip()
+                f.close()
+                return buf
+        except:
             if default is not None:
                 return default
             else:
                 raise KeyError, "Key %s is not set for %s" % (option, self.name)
 
     def update(self, option, value):
+        if self.cache:
+            return
+
         try:
             old_umask = os.umask(0022)
             filename = os.path.join(self.dir, option)
@@ -93,14 +103,35 @@ class VServerConfig:
             raise
 
     def unset(self, option):
+        if self.cache:
+            return
+
         try:
             filename = os.path.join(self.dir, option)
             os.unlink(filename)
-            os.removedirs(os.path.dirname(filename))
+            try:
+                os.removedirs(os.path.dirname(filename))
+            except:
+                pass
             return True
         except:
             return False
 
+    def cache_it(self):
+        self.cache = {}
+        def add_to_cache(cache, dirname, fnames):
+            for file in fnames:
+                full_name = os.path.join(dirname, file)
+                if os.path.islink(full_name):
+                    fnames.remove(file)
+                elif (os.path.isfile(full_name) and
+                      os.access(full_name, os.R_OK)):
+                    f = open(full_name, "r")
+                    cache[full_name.replace(os.path.join(self.dir, ''),
+                                            '')] = f.read().rstrip()
+                    f.close()
+        os.path.walk(self.dir, add_to_cache, self.cache)
+
 
 class VServer:
 
@@ -220,7 +251,7 @@ class VServer:
         return None
 
     def __do_chroot(self):
-
+        self.config.cache_it()
         os.chroot(self.dir)
         os.chdir("/")
 
@@ -424,14 +455,14 @@ class VServer:
                 # execute each init script in turn
                 # XXX - we don't support all scripts that vserver script does
                 self.__do_chcontext(state_file)
-                for cmd in self.INITSCRIPTS + [None]:
+                for cmd in self.INITSCRIPTS:
                      try:
                          # enter vserver context
                          arg_subst = { 'runlevel': runlevel }
                          cmd_args = [cmd[0]] + map(lambda x: x % arg_subst,
                                                    cmd[1:])
                          print >>log, "executing '%s'" % " ".join(cmd_args)
-                         os.spawnvp(os.P_WAIT,cmd[0],*cmd_args)
+                         os.spawnvp(os.P_WAIT,cmd[0],cmd_args)
                      except:
                          traceback.print_exc()
                          os._exit(1)