lvm: Check lvm.conf for auto-activation support

blivet/devicelibs/lvm.py

@@ -21,7 +21,6 @@
 #
 
 import math
-import os
 import re
 
 from collections import namedtuple
@@ -70,8 +69,6 @@
 
 EXTERNAL_DEPENDENCIES = [availability.BLOCKDEV_LVM_PLUGIN]
 
-LVMETAD_SOCKET_PATH = "/run/lvm/lvmetad.socket"
-
 safe_name_characters = "0-9a-zA-Z._-"
 
 if hasattr(blockdev.LVMTech, "DEVICES"):
@@ -87,6 +84,18 @@
 
 LVM_DEVICES_FILE = "/etc/lvm/devices/system.devices"
 
+if hasattr(blockdev.LVMTech, "CONFIG"):
+    try:
+        event_activation = blockdev.lvm.config_get("global", "event_activation", "full")
+    except (blockdev.LVMError, blockdev.BlockDevNotImplementedError):
+        AUTO_ACTIVATION = True
+    else:
+        AUTO_ACTIVATION = bool(int(event_activation))
+else:
+    # it's safer to assume LVM auto activation is enabled than disabled
+    # worst case scenario is we will needlessly wait for auto activation
+    AUTO_ACTIVATION = True
+
 # list of devices that LVM is allowed to use
 # with LVM >= 2.0.13 we'll use this for the --devices option and when creating
 # the /etc/lvm/devices/system.devices file
@@ -233,10 +242,6 @@ def determine_parent_lv(internal_lv, lvs, lv_info):
     return None
 
 
-def lvmetad_socket_exists():
-    return os.path.exists(LVMETAD_SOCKET_PATH)
-
-
 def ensure_lv_is_writable(vg_name, lv_name):
     lv_info = lvs_info.cache.get("%s-%s" % (vg_name, lv_name))
     if lv_info is None:

blivet/devices/lvm.py

@@ -1116,20 +1116,18 @@ def check_size(self):
         return 0
 
     def _pre_setup(self, orig=False):
-        # If the lvmetad socket exists and any PV is inactive before we call
+        # If auto-activation is enabled and any PV is inactive before we call
         # setup_parents (via _pre_setup, below), we should wait for auto-
         # activation before trying to manually activate this LV.
-        auto_activate = (lvm.lvmetad_socket_exists() and
+        auto_activate = (lvm.AUTO_ACTIVATION and
                          any(not pv.format.status for pv in self.vg.pvs))
         if not super(LVMLogicalVolumeBase, self)._pre_setup(orig=orig):
             return False
 
         if auto_activate:
             log.debug("waiting for lvm auto-activation of %s", self.name)
             # Wait for auto-activation for up to 30 seconds. If this LV hasn't
-            # been activated when the timeout is reached, there may be some
-            # lvm.conf content preventing auto-activation of this LV, so we
-            # have to do it ourselves.
+            # been activated when the timeout is reached, we try do it ourselves.
             # The timeout value of 30 seconds was suggested by prajnoha. He
             # noted that udev uses the same value, for whatever that's worth.
             timeout = 30  # seconds

tests/unit_tests/devices_test/device_methods_test.py

@@ -345,7 +345,7 @@ def test_setup(self, *args):  # pylint: disable=unused-argument,arguments-differ
 
     @patch("blivet.devices.lvm.LVMLogicalVolumeBase.type_external_dependencies", return_value=set())
     def test_teardown(self, *args):  # pylint: disable=unused-argument,arguments-differ
-        with patch("blivet.devicelibs.lvm.lvmetad_socket_exists", return_value=False):
+        with patch("blivet.devicelibs.lvm.AUTO_ACTIVATION", return_value=False):
             super(LVMLogicalVolumeDeviceMethodsTestCase, self).test_teardown()
 
         with patch("blivet.devices.lvm.blockdev.lvm") as lvm: