Tell LVM DBus to refresh it's internal status during reset

Unfortunately some users run wipefs <disk> thinking it's enough
to remove all devices on top of the disk cleanly.
In cases where the PV is not directly on the disk, LVM DBus
doesn't get a udev event and doesn't remove the VG and LVs from
DBus so we think these still exist.

Author: vojtechtrefny

blivet/devicelibs/lvm.py

@@ -36,6 +36,7 @@
 log = logging.getLogger("blivet")
 
 from . import raid
+from .. import safe_dbus
 from ..size import Size
 from ..i18n import N_
 from ..flags import flags
@@ -338,3 +339,21 @@ def reenable_lvm_autoactivation(lvmconf=LVM_LOCAL_CONF):
 
     global AUTO_ACTIVATION
     AUTO_ACTIVATION = False
+
+
+def lvm_dbusd_refresh():
+    lvm_soname = blockdev.get_plugin_soname(blockdev.Plugin.LVM)
+    if 'dbus' not in lvm_soname:
+        return
+
+    try:
+        rc = safe_dbus.call_sync("com.redhat.lvmdbus1",
+                                 "/com/redhat/lvmdbus1/Manager",
+                                 "com.redhat.lvmdbus1.Manager",
+                                 "Refresh",
+                                 None)
+    except safe_dbus.DBusCallError as e:
+        log.error("Exception occurred when calling LVM DBusD refresh: %s", str(e))
+    else:
+        if rc[0] != 0:
+            log.error("Failed to call LVM DBusD refresh: %s", rc)

blivet/devicetree.py

@@ -102,6 +102,9 @@ def reset(self, ignored_disks=None, exclusive_disks=None):
 
         lvm.lvm_devices_reset()
 
+        # force LVM DBusD to refresh its internal state
+        lvm.lvm_dbusd_refresh()
+
         self.exclusive_disks = exclusive_disks or []
         self.ignored_disks = ignored_disks or []