I asked Dan Watkins about this and received this reply:

In terms of scope, cloud-init does not Depend on genisoimage but does
recommend its use in documentation.  cloud-image-utils (built from
cloud-utils) does Depend directly on it.

It sounds like, if it's going away, genisoimage is going away in
bookworm, the Debian stable release after the one that just went into
freeze (bullseye).  bullseye goes into hard freeze (2021-03-12[0]) after
hirsute's Debian import freeze (2021-02-25[1]), so there's no chance
that it will affect hirsute.  If bullseye is released before ~August
(Debian don't have set release dates, they release once it's Ready
(TM)), and genisoimage is removed from testing soon after that release,
then it may affect us is in I.

So from a "when will the wheels fall off in Ubuntu" perspective, we (a)
have a decent runway, and (b) will only be affected in the release whose
development is open after the removal happens in Debian.

That said, cloud-image-utils is in main[2] and therefore all of its
dependencies also need to be in main, so we are not free to choose our
own replacement unconstrained.  We certainly won't be alone in needing
to choose a replacement, `apt rdepends genisoimage` indicates that,
amongst others, ubuntu-desktop and livecd-rootfs (which is the package
used to build not only live CD root filesystems but also ~every other
Ubuntu image).  IMO, it's not really our place to determine the correct
replacement here: this is a tool used across different parts of Ubuntu,
so Foundations are likely better placed than we.

>From an upstream cloud-init perspective, this indicates to me that we
shouldn't be recommending genisoimage to our users in our documentation.
The sooner we can document the new method of doing this, the fewer users
will be broken by its future removal (whether in Debian, Ubuntu or
whenever their distro decides to follow suite).  Of course, we should
align the docs with what Ubuntu is choosing, so there's a (task)
dependency there.

[0] https://wiki.debian.org/DebianBullseye
[1] https://discourse.ubuntu.com/t/hirsute-hippo-release-schedule/18539
[2] Some details at https://wiki.ubuntu.com/MainInclusionProcess; TL;DR,
    we support main both in security terms and commercially, so anything
    that goes into main has to pass muster in terms of supportability.


** Changed in: cloud-init
       Status: New => Confirmed

** Changed in: cloud-utils (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1915077

Title:
  genisoimage may be going away

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