[Bug 2086455] [NEW] manifest not generated for ubuntu-cpc uefi hook in riscv64 when no subarch present

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Cody Shepherd (codyshepherd):

[ Impact ]

 * Lack of manifest causes downstream builds to break during the
manifest copy commands in the qcow binary hook. This is causing jammy
riscv64 builds to fail.

 * proposed fix [1] is to check that $SUBARCH is nonzero in the if
branch that returns early.

[ Test Plan ]

 * reproducer is a livefs build of the ubuntu-cpc project for jammy
riscv64 using the cloudware livefs build. The build will fail in the
following way:

```
+ cp livecd.ubuntu-cpc.disk-uefi.manifest /build/livecd.ubuntu-cpc.qcow.manifest
cp: cannot stat 'livecd.ubuntu-cpc.disk-uefi.manifest': No such file or directory
+ Echo_error config/hooks/021-qcow2-image.binary failed (exit non-zero). You should check for errors.
```

[ Where problems could occur ]

 * the risk is that there is some subarch outside of those specified in
the if-branch for which the early return is necessary. I don't have any
indication that there is, but my information could very well be
incomplete.

[ Other Info ]

 * This appears to be isolated to jammy only, as we don't build qcow
images for riscv in focal, and the hook was changed significantly in
noble. Therefore this change should not need to be in other livecd-
rootfs branches.

1. https://code.launchpad.net/~codyshepherd/livecd-rootfs/+git/livecd-
rootfs/+merge/475962

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New

-- 
manifest not generated for ubuntu-cpc uefi hook in riscv64 when no subarch present
https://bugs.launchpad.net/bugs/2086455
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