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[Chad Smith <chad.smith@xxxxxxxxxxxxx>]

Chad Smith has proposed merging ~chad.smith/cloud-init:feature/1797480-azure-support-gen2-instances into cloud-init:master.

Commit message:
azure: add udev rules to create cloud-init Gen2 disk name symlinks

Cloud-init delivers udev rules on Azure to create the following symlinks:
- /dev/disk/cloud/azure_root
- /dev/disk/cloud/azure_root-part#
- /dev/disk/cloud/azure_resource
- /dev/disk/cloud/azure_resource-part#

Cloud-init cc_disk_setup expects presence of these dev links in order to
setup the mounted ephemeral disks. Gen1 instances udev rules match based
only a DEVICE_ID attribute that no longer exists on Gen2 instances.
Supplement existing Gen1 rules with matches on specitic SCSI target/lun
path 0:0:0 and 0:0:1 and generate links for azure_root and azure_resource
respectively.

LP: #1797480

Requested reviews:
  cloud-init commiters (cloud-init-dev)

For more details, see:
https://code.launchpad.net/~chad.smith/cloud-init/+git/cloud-init/+merge/358190
-- 
Your team cloud-init commiters is requested to review the proposed merge of ~chad.smith/cloud-init:feature/1797480-azure-support-gen2-instances into cloud-init:master.

diff --git a/udev/66-azure-ephemeral.rules b/udev/66-azure-ephemeral.rules
index b9c5c3e..2406df3 100644
--- a/udev/66-azure-ephemeral.rules
+++ b/udev/66-azure-ephemeral.rules
@@ -4,10 +4,26 @@ 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
+# Root has a GUID of 0000 as the second value on Gen1 instances
 # 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"
+
+# Azure well known SCSI controllers
+ATTRS{device_id}=="{f8b3781a-1e82-4818-a1c3-63d806ec15bb}", ENV{fabric_scsi_controller}="scsi0", GOTO="azure_datadisk"
+# Do not create symlinks for scsi[1-3] or unmatched device_ids
+ATTRS{device_id}=="{f8b3781b-1e82-4818-a1c3-63d806ec15bb}", ENV{fabric_scsi_controller}="scsi1", GOTO="cloud_init_end"
+ATTRS{device_id}=="{f8b3781c-1e82-4818-a1c3-63d806ec15bb}", ENV{fabric_scsi_controller}="scsi2", GOTO="cloud_init_end"
+ATTRS{device_id}=="{f8b3781d-1e82-4818-a1c3-63d806ec15bb}", ENV{fabric_scsi_controller}="scsi3", GOTO="cloud_init_end"
+GOTO="cloud_init_end"
+
+# Map scsi#/lun# fabric_name to azure_root|resource on Gen2 instances
+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"
+ENV{DEVTYPE}=="disk", PROGRAM="/bin/sh -c 'readlink /sys/class/block/%k/device|cut -d: -f4'", ENV{fabric_name}="$env{fabric_scsi_controller}/lun$result"
+
+ENV{fabric_name}=="scsi0/lun0", ENV{fabric_name}="azure_root", GOTO="ci_azure_names"
+ENV{fabric_name}=="scsi0/lun1", ENV{fabric_name}="azure_resource", GOTO="ci_azure_names"
 GOTO="cloud_init_end"
 
 # Create the symlinks