/lib/udev/rules.d/xen-frontend.rules is in xcp-xapi 1.3.2-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | SUBSYSTEM=="block", KERNEL=="xvd*", RUN+="/usr/lib/xcp/scripts/block-frontend $env{ACTION} $number"
|