Add disk-size-hint to prep-images repo

Previously this code lived in prep-baremetal repo.
Since this repo is called often before introspection
is run, the disk-size-hints are called before
they can impact the correct values.

disk-size-hints is historically used only on some
baremetal environments but can be included in
validation tests on virt environments as well.

Related-To: Idfca0da41275922f4b846cc167980e95f4fe8321
Related-To: If4dd41baa38639a7c0965049651641d489870983

Change-Id: I3c0fe67d2b4adcafa65057a8536e2629c62491e7

README.md

@@ -17,6 +17,8 @@ Role Variables
 - baremetal_instackenv: <"{{ working_dir }}/instackenv.json"> -- location of instackenv.json to copy over
 - baremetal_network_environment: <"{{ working_dir }}/network-isolation.yml"> -- location of network-environment file to copy over
 - undercloud_type: <virtual> -- can be overwritten with values like 'baremetal' or 'ovb'
+- step_root_device_size: <false> -- add disk size hints if needed for the environment under test
+- disk_root_device_size: <1843> -- size hint for selecting the correct disk during introspection
 
 Dependencies
 ------------

defaults/main.yml

@@ -4,5 +4,5 @@ overcloud_prep_images_log: "{{ working_dir }}/overcloud_prep_images.log"
 step_introspect: false
 bash_deploy_ramdisk: false
 step_install_undercloud: true
-
-
+step_root_device_size: false
+disk_root_device_size: 1843

tasks/overcloud-prep-images.yml

@@ -2,4 +2,3 @@
   shell: |
     {{ working_dir }}/overcloud-prep-images.sh > \
     {{ overcloud_prep_images_log }} 2>&1
-

templates/overcloud-prep-images.sh.j2

@@ -30,6 +30,36 @@ sudo systemctl restart openstack-ironic-conductor && sleep 30
 openstack baremetal import --json instackenv.json
 openstack baremetal configure boot
 
+{% if step_root_device_size|bool %}
+
+## * Get nodes UUID
+## ::
+
+export items="$( ironic node-list | awk '/power/ {print $2}' )"
+
+## * Find disk size from instackenv.json
+## ::
+
+export DISK_SIZE="$( jq '.["nodes"][]["disk"] | tonumber' instackenv.json )"
+
+## * Update nodes with disk size hint
+## ::
+
+count=0
+ARRAY_DISK_SIZE=($(echo $DISK_SIZE))
+ROOT_DEVICE_SIZE={{ disk_root_device_size }}
+for item in $items; do
+    if  [ $ROOT_DEVICE_SIZE -ge ${ARRAY_DISK_SIZE[$count]} ]; then
+        declare i ADS
+        ADS=${ARRAY_DISK_SIZE[$count]}
+        ironic node-update $item add properties/root_device='{"size": '$ADS'}'
+    fi
+    count=$((count+1))
+done
+
+{% endif %}
+
+
 {% if step_introspect %}
 
 ## * Introspect hardware attributes of nodes.