/lib/udev/rules.d/66-azure-storage.rules is in walinuxagent 2.2.32-0ubuntu1~16.04.2.
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 19 20 21 22 23 24 25 26 27 28 | ACTION=="add|change", SUBSYSTEM=="block", ENV{ID_VENDOR}=="Msft", ENV{ID_MODEL}=="Virtual_Disk", GOTO="azure_disk"
GOTO="azure_end"
LABEL="azure_disk"
# 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}="root", GOTO="azure_names"
ATTRS{device_id}=="?00000000-0001-*", ENV{fabric_name}="resource", GOTO="azure_names"
ATTRS{device_id}=="?00000001-0001-*", ENV{fabric_name}="BEK", GOTO="azure_names"
# Wellknown SCSI controllers
ATTRS{device_id}=="{f8b3781a-1e82-4818-a1c3-63d806ec15bb}", ENV{fabric_scsi_controller}="scsi0", GOTO="azure_datadisk"
ATTRS{device_id}=="{f8b3781b-1e82-4818-a1c3-63d806ec15bb}", ENV{fabric_scsi_controller}="scsi1", GOTO="azure_datadisk"
ATTRS{device_id}=="{f8b3781c-1e82-4818-a1c3-63d806ec15bb}", ENV{fabric_scsi_controller}="scsi2", GOTO="azure_datadisk"
ATTRS{device_id}=="{f8b3781d-1e82-4818-a1c3-63d806ec15bb}", ENV{fabric_scsi_controller}="scsi3", GOTO="azure_datadisk"
GOTO="azure_end"
# Retrieve LUN number for datadisks
LABEL="azure_datadisk"
ENV{DEVTYPE}=="partition", PROGRAM="/bin/sh -c 'readlink /sys/class/block/%k/../device|cut -d: -f4'", ENV{fabric_name}="$env{fabric_scsi_controller}/lun$result", GOTO="azure_names"
PROGRAM="/bin/sh -c 'readlink /sys/class/block/%k/device|cut -d: -f4'", ENV{fabric_name}="$env{fabric_scsi_controller}/lun$result", GOTO="azure_names"
GOTO="azure_end"
# Create the symlinks
LABEL="azure_names"
ENV{DEVTYPE}=="disk", SYMLINK+="disk/azure/$env{fabric_name}"
ENV{DEVTYPE}=="partition", SYMLINK+="disk/azure/$env{fabric_name}-part%n"
LABEL="azure_end"
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