/lib/udev/rules.d/79-cloud-init-net-wait.rules is in cloud-init 0.7.7~bzr1212-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # cloud-init cold/hot-plug blocking mechanism
# this file blocks further processing of network events
# until cloud-init local has had a chance to read and apply network
SUBSYSTEM!="net", GOTO="cloudinit_naming_end"
ACTION!="add", GOTO="cloudinit_naming_end"
IMPORT{program}="/lib/udev/cloud-init-wait"
LABEL="cloudinit_naming_end"
# vi: ts=4 expandtab syntax=udevrules
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