fix(update-server): persist the machine-id after writing the rootfs to the unused partition.

[vegano1]

Overview

The /etc/machine-id on the Flex is not persisting through updates since the file gets overwritten during an update, this pr fixes that by writing the machine-id to the unused partition after the rootfs has been written to it.

This needs or-core-pr-87 openemdedded change to work

Test Plan

• Make sure that the UUID in /etc/machine-id persists after an update

Changelog

• After the new rootfs has been written to the unused partition, read the old /etc/machine-id and write it to the new rootfs.

Review requests

Risk assessment

Low, this changes a small part of the update mechanism.

[codecov]

Codecov Report

Merging #13077 (fdb80af) into edge (11b4775) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             edge   #13077      +/-   ##
==========================================
- Coverage   72.51%   72.51%   -0.01%     
==========================================
  Files        2345     2345              
  Lines       64886    64889       +3     
  Branches     7152     7152              
==========================================
  Hits        47054    47054              
- Misses      16108    16111       +3     
  Partials     1724     1724              

Flag	Coverage Δ
update-server	65.49% <0.00%> (-0.16%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ate-server/otupdate/openembedded/update_actions.py	54.83% <0.00%> (-1.09%)	⬇️

[sfoster1]

Ooh interesting. This looks correct to me and should get merged but I might also pop it over to a new alpha if we do one

[vegano1]

@sfoster1
Sounds good, once I test this ill merge it in.

[vegano1]

@sfoster1

This openembedded change is required to persist the machine-id, it bind-mounts /mnt -> userfs/var/mnt so the update-server change above can write the machine-id to the unused partition.