[Bug 1903034] Re: RISC-V 64 images support

[Dimitri John Ledkov]

Will try to not remove the livefs build for focal verification!

** Description changed:

  [Impact]
  
-  * Add support to build risc-v 64 cpc & buildd images for LXD, cloud-
- images, and buildd targets.
+  * Add support to build risc-v 64 cpc & buildd images for LXD, cloud-
+ images, buildd and hifive (focal-only) preinstalled image targets.
  
  [Test Case]
  
-  * Execute a riscv64 livefs build for the buildd subproject of ubuntu-
+  * Execute a riscv64 livefs build for the buildd subproject of ubuntu-
  base
  
-  * Execute a riscv64 livefs build for the ubuntu-cpc project
+  * Execute a riscv64 livefs build for the ubuntu-cpc project
  
-  * Build should succeed since we have lxd builders, and the required
+  * Execute a riscv64 livefs build for the ubuntu-server preinstalled
+ project
+ 
+  * Build should succeed since we have lxd builders, and the required
  packages to produce the above images.
  
  [Regression Potential]
  
-  * Only debian/control is changed to install the extra utils that are
- now available on riscv64. Thus there should be no impact on any other
- arches or image types.
+  * Care has been taken to modify riscv64 code paths only, and correct
+ some mistakes in the common hooks that are used to determine which image
+ types to build (i.e. MBR images were built on ARM when they are not
+ needed, and AMD64 MBR image is in fact needed!). This changes are now
+ tested extensively in hirsute to ensure other image types are
+ unaffected, and these images work correctly.

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https://bugs.launchpad.net/bugs/1903034

Title:
  RISC-V 64 images support

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Focal:
  In Progress
Status in livecd-rootfs source package in Groovy:
  Fix Released
Status in livecd-rootfs source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

   * Add support to build risc-v 64 cpc & buildd images for LXD, cloud-
  images, buildd and hifive (focal-only) preinstalled image targets.

  [Test Case]

   * Execute a riscv64 livefs build for the buildd subproject of ubuntu-
  base

   * Execute a riscv64 livefs build for the ubuntu-cpc project

   * Execute a riscv64 livefs build for the ubuntu-server preinstalled
  project

   * Build should succeed since we have lxd builders, and the required
  packages to produce the above images.

  [Regression Potential]

   * Care has been taken to modify riscv64 code paths only, and correct
  some mistakes in the common hooks that are used to determine which
  image types to build (i.e. MBR images were built on ARM when they are
  not needed, and AMD64 MBR image is in fact needed!). This changes are
  now tested extensively in hirsute to ensure other image types are
  unaffected, and these images work correctly.

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