Merge remote-tracking branch 'qubesos/pr/166'

* qubesos/pr/166:
  create "lvm" pool using rootfs thin pool instead of hardcoding qubes_dom0-pool00
  change default pool code to be fast
  cache PropertyHolder.property_list and use O(1) property name lookups
  remove unused netid code
  cache isinstance(default, collections.Callable)
  don't access netvm if it's None in visible_gateway/netmask

qubes/__init__.py

@@ -200,6 +200,10 @@ class property(object):  # pylint: disable=redefined-builtin,invalid-name
             lambda self, prop, value: str(value))
         self.type = type
         self._default = default
+        self._default_function = None
+        if isinstance(default, collections.Callable):
+            self._default_function = default
+
         self._write_once = write_once
         self.order = order
         self.load_stage = load_stage
@@ -227,8 +231,8 @@ class property(object):  # pylint: disable=redefined-builtin,invalid-name
         if self._default is self._NO_DEFAULT:
             raise AttributeError(
                 'property {!r} have no default'.format(self.__name__))
-        elif isinstance(self._default, collections.Callable):
-            return self._default(instance)
+        elif self._default_function:
+            return self._default_function(instance)
         else:
             return self._default
 
@@ -492,7 +496,7 @@ class PropertyHolder(qubes.events.Emitter):
 
         propvalues = {}
 
-        all_names = set(prop.__name__ for prop in self.property_list())
+        all_names = self.property_dict()
         for key in list(kwargs):
             if not key in all_names:
                 continue
@@ -505,8 +509,6 @@ class PropertyHolder(qubes.events.Emitter):
 
         if self.xml is not None:
             # check if properties are appropriate
-            all_names = set(prop.__name__ for prop in self.property_list())
-
             for node in self.xml.xpath('./properties/property'):
                 name = node.get('name')
                 if name not in all_names:
@@ -514,6 +516,39 @@ class PropertyHolder(qubes.events.Emitter):
                         'property {!r} not applicable to {!r}'.format(
                             name, self.__class__.__name__))
 
+    # pylint: disable=too-many-nested-blocks
+    @classmethod
+    def property_dict(cls, load_stage=None):
+        '''List all properties attached to this VM's class
+
+        :param load_stage: Filter by load stage
+        :type load_stage: :py:func:`int` or :py:obj:`None`
+        '''
+
+        # use cls.__dict__ since we must not look at parent classes
+        if "_property_dict" not in cls.__dict__:
+            cls._property_dict = {}
+        memo = cls._property_dict
+
+        if load_stage not in memo:
+            props = dict()
+            if load_stage is None:
+                for class_ in cls.__mro__:
+                    for name in class_.__dict__:
+                        # don't overwrite props with those from base classes
+                        if name not in props:
+                            prop = class_.__dict__[name]
+                            if isinstance(prop, property):
+                                assert name == prop.__name__
+                                props[name] = prop
+            else:
+                for prop in cls.property_dict().values():
+                    if prop.load_stage == load_stage:
+                        props[prop.__name__] = prop
+            memo[load_stage] = props
+
+        return memo[load_stage]
+
     @classmethod
     def property_list(cls, load_stage=None):
         '''List all properties attached to this VM's class
@@ -522,14 +557,15 @@ class PropertyHolder(qubes.events.Emitter):
         :type load_stage: :py:func:`int` or :py:obj:`None`
         '''
 
-        props = set()
-        for class_ in cls.__mro__:
-            props.update(prop for prop in class_.__dict__.values()
-                if isinstance(prop, property))
-        if load_stage is not None:
-            props = set(prop for prop in props
-                if prop.load_stage == load_stage)
-        return sorted(props)
+        # use cls.__dict__ since we must not look at parent classes
+        if "_property_list" not in cls.__dict__:
+            cls._property_list = {}
+        memo = cls._property_list
+
+        if load_stage not in memo:
+            memo[load_stage] = sorted(cls.property_dict(load_stage).values())
+
+        return memo[load_stage]
 
     def _property_init(self, prop, value):
         '''Initialise property to a given value, without side effects.
@@ -584,9 +620,9 @@ class PropertyHolder(qubes.events.Emitter):
         if isinstance(prop, qubes.property):
             return prop
 
-        for p in cls.property_list():
-            if p.__name__ == prop:
-                return p
+        props = cls.property_dict()
+        if prop in props:
+            return props[prop]
 
         raise AttributeError('No property {!r} found in {!r}'.format(
             prop, cls))

qubes/app.py

@@ -538,14 +538,6 @@ class VMCollection(object):
         raise LookupError("Cannot find unused qid!")
 
 
-    def get_new_unused_netid(self):
-        used_ids = set([vm.netid for vm in self])  # if vm.is_netvm()])
-        for i in range(1, qubes.config.max_netid):
-            if i not in used_ids:
-                return i
-        raise LookupError("Cannot find unused netid!")
-
-
     def get_new_unused_dispid(self):
         for _ in range(int(qubes.config.max_dispid ** 0.5)):
             dispid = random.SystemRandom().randrange(qubes.config.max_dispid)
@@ -555,6 +547,55 @@ class VMCollection(object):
             'https://xkcd.com/221/',
             'http://dilbert.com/strip/2001-10-25')[random.randint(0, 1)])
 
+# pylint: disable=too-few-public-methods
+class RootThinPool:
+    '''The thin pool containing the rootfs device'''
+    _inited = False
+    _volume_group = None
+    _thin_pool = None
+
+    @classmethod
+    def _init(cls):
+        '''Find out the thin pool containing the root device'''
+        if not cls._inited:
+            cls._inited = True
+
+            try:
+                rootfs = os.stat('/')
+                root_major = (rootfs.st_dev & 0xff00) >> 8
+                root_minor = rootfs.st_dev & 0xff
+
+                root_table = subprocess.check_output(["dmsetup",
+                    "-j", str(root_major), "-m", str(root_minor),
+                    "table"])
+
+                _start, _sectors, target_type, target_args = \
+                    root_table.decode().split(" ", 3)
+                if target_type == "thin":
+                    thin_pool_devnum, _thin_pool_id = target_args.split(" ")
+                    with open("/sys/dev/block/{}/dm/name"
+                        .format(thin_pool_devnum), "r") as thin_pool_tpool_f:
+                        thin_pool_tpool = thin_pool_tpool_f.read().rstrip('\n')
+                    if thin_pool_tpool.endswith("-tpool"):
+                        volume_group, thin_pool, _tpool = \
+                            thin_pool_tpool.rsplit("-", 2)
+                        cls._volume_group = volume_group
+                        cls._thin_pool = thin_pool
+            except: # pylint: disable=bare-except
+                pass
+
+    @classmethod
+    def volume_group(cls):
+        '''Volume group of the thin pool containing the rootfs device'''
+        cls._init()
+        return cls._volume_group
+
+    @classmethod
+    def thin_pool(cls):
+        '''Thin pool name containing the rootfs device'''
+        cls._init()
+        return cls._thin_pool
+
 def _default_pool(app):
     ''' Default storage pool.
 
@@ -566,20 +607,16 @@ def _default_pool(app):
     if 'default' in app.pools:
         return app.pools['default']
     else:
-        rootfs = os.stat('/')
-        root_major = (rootfs.st_dev & 0xff00) >> 8
-        root_minor = rootfs.st_dev & 0xff
-        for pool in app.pools.values():
-            if pool.config.get('driver', None) != 'lvm_thin':
-                continue
-            thin_pool = pool.config['thin_pool']
-            thin_volumes = subprocess.check_output(
-                ['lvs', '--select', 'pool_lv=' + thin_pool,
-                '-o', 'lv_kernel_major,lv_kernel_minor', '--noheadings'])
-            thin_volumes = thin_volumes.decode()
-            if any([str(root_major), str(root_minor)] == thin_vol.split()
-                    for thin_vol in thin_volumes.splitlines()):
-                return pool
+        root_volume_group = RootThinPool.volume_group()
+        root_thin_pool = RootThinPool.thin_pool()
+        if root_thin_pool:
+            for pool in app.pools.values():
+                if pool.config.get('driver', None) != 'lvm_thin':
+                    continue
+                if (pool.config['volume_group'] == root_volume_group and
+                    pool.config['thin_pool'] == root_thin_pool):
+                    return pool
+
         # not a thin volume? look for file pools
         for pool in app.pools.values():
             if pool.config.get('driver', None) != 'file':
@@ -1005,10 +1042,13 @@ class Qubes(qubes.PropertyHolder):
         }
         assert max(self.labels.keys()) == qubes.config.max_default_label
 
-        # check if the default LVM Thin pool qubes_dom0/pool00 exists
-        if os.path.exists('/dev/mapper/qubes_dom0-pool00-tpool'):
-            self.add_pool(volume_group='qubes_dom0', thin_pool='pool00',
-                          name='lvm', driver='lvm_thin')
+        root_volume_group = RootThinPool.volume_group()
+        root_thin_pool = RootThinPool.thin_pool()
+
+        if root_thin_pool:
+            self.add_pool(
+                volume_group=root_volume_group, thin_pool=root_thin_pool,
+                name='lvm', driver='lvm_thin')
         # pool based on /var/lib/qubes will be created here:
         for name, config in qubes.config.defaults['pool_configs'].items():
             self.pools[name] = self._get_pool(**config)

qubes/config.py

@@ -100,7 +100,6 @@ defaults = {
 }
 
 max_qid = 254
-max_netid = 254
 max_dispid = 10000
 #: built-in standard labels, if creating new one, allocate them above this
 # number, at least until label index is removed from API

qubes/tests/app.py

@@ -257,12 +257,6 @@ class TC_30_VMCollection(qubes.tests.QubesTestCase):
 
         self.vms.get_new_unused_qid()
 
-    def test_101_get_new_unused_netid(self):
-        self.vms.add(self.testvm1)
-        self.vms.add(self.testvm2)
-
-        self.vms.get_new_unused_netid()
-
 #   def test_200_get_vms_based_on(self):
 #       pass
 

qubes/tests/init.py

@@ -323,7 +323,6 @@ class TC_20_PropertyHolder(qubes.tests.QubesTestCase):
 class TestVM(qubes.vm.BaseVM):
     qid = qubes.property('qid', type=int)
     name = qubes.property('name')
-    netid = qid
     uuid = uuid.uuid5(uuid.NAMESPACE_DNS, 'testvm')
 
     def __lt__(self, other):
@@ -452,12 +451,6 @@ class TC_30_VMCollection(qubes.tests.QubesTestCase):
 
         self.vms.get_new_unused_qid()
 
-    def test_101_get_new_unused_netid(self):
-        self.vms.add(self.testvm1)
-        self.vms.add(self.testvm2)
-
-        self.vms.get_new_unused_netid()
-
 #   def test_200_get_vms_based_on(self):
 #       pass
 

qubes/vm/adminvm.py

@@ -189,7 +189,7 @@ class AdminVM(qubes.vm.BaseVM):
 
 
 #   def __init__(self, **kwargs):
-#       super(QubesAdminVm, self).__init__(qid=0, name="dom0", netid=0,
+#       super(QubesAdminVm, self).__init__(qid=0, name="dom0",
 #                                            dir_path=None,
 #                                            private_img = None,
 #                                            template = None,

qubes/vm/mix/net.py

@@ -123,13 +123,13 @@ class NetVMMixin(qubes.events.Emitter):
     def visible_gateway(self):
         '''Default gateway of this domain as seen by the domain.'''
         return self.features.check_with_template('net.fake-gateway', None) or \
-            self.netvm.gateway
+            (self.netvm.gateway if self.netvm else None)
 
     @qubes.stateless_property
     def visible_netmask(self):
         '''Netmask as seen by the domain.'''
         return self.features.check_with_template('net.fake-netmask', None) or \
-            self.netvm.netmask
+            (self.netvm.netmask if self.netvm else None)
 
     #
     # used in netvms (provides_network=True)