Ignore dm devs when scanning for mpath members (#761278)

The initial loop through udev's block device list is mostly to
identify and assemble mpaths. Already-active mpaths in that list
cause problems because of the special way mpaths are handled. However,
mpath member devices are never device-mapper devices so we can safely
skip over them in this mpath-specific loop.

1 files changed, 6 insertions, 0 deletions

diff --git a/pyanaconda/storage/devicetree.py b/pyanaconda/storage/devicetree.py
index 5c789b0c1..9a903eb9d 100644
--- a/pyanaconda/storage/devicetree.py
+++ b/pyanaconda/storage/devicetree.py
@@ -1935,6 +1935,12 @@ class DeviceTree(object):
                  [d['name'] for d in self.topology.devices_iter()])
         old_devices = {}
         for dev in self.topology.devices_iter():
+            # avoid the problems caused by encountering multipath devices in
+            # this loop by simply skipping all dm devices here
+            if dev['name'].startswith("dm-"):
+                log.debug("Skipping a device mapper drive (%s) for now" % dev['name'])
+                continue
+
             old_devices[dev['name']] = dev
             self.addUdevDevice(dev)
             if progressWindow: