Disable "zfs-volume-wait" service inside container

Author: Prakash Surya

files/common/lib/systemd/system/zfs-volume-wait.service.d/override.conf

@@ -0,0 +1,17 @@
+#
+# During upgrade verification, the root filesystem will be booted as a
+# container using systemd-nspawn. When the zfs-volume-wait service runs
+# in this container, it will fail to complete in a timely manner,
+# resulting in a failure to start the upgrade container (the logic that
+# starts the container will timeout).
+#
+# The service fails to complete in a timely manner because "/dev" in the
+# container is not the same as "/dev" on the host. The ZVOL devices that
+# the service is waiting to appear in "/dev", will not appear within the
+# container (by design).
+#
+# Thus, to workaround this problem, we explicitly disable this service
+# from running when inside of the container.
+#
+[Unit]
+ConditionVirtualization=!container