/lib/udev/rules.d/66-azure-ephemeral.rules is in cloud-init 18.2-14-g6d48d265-0ubuntu1.
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 11 12 13 14 15 16 17 18 | # Azure specific rules
ACTION!="add|change", GOTO="cloud_init_end"
SUBSYSTEM!="block", GOTO="cloud_init_end"
ATTRS{ID_VENDOR}!="Msft", GOTO="cloud_init_end"
ATTRS{ID_MODEL}!="Virtual_Disk", GOTO="cloud_init_end"
# Root has a GUID of 0000 as the second value
# The resource/resource has GUID of 0001 as the second value
ATTRS{device_id}=="?00000000-0000-*", ENV{fabric_name}="azure_root", GOTO="ci_azure_names"
ATTRS{device_id}=="?00000000-0001-*", ENV{fabric_name}="azure_resource", GOTO="ci_azure_names"
GOTO="cloud_init_end"
# Create the symlinks
LABEL="ci_azure_names"
ENV{DEVTYPE}=="disk", SYMLINK+="disk/cloud/$env{fabric_name}"
ENV{DEVTYPE}=="partition", SYMLINK+="disk/cloud/$env{fabric_name}-part%n"
LABEL="cloud_init_end"
|