[Bug 1837088] [NEW] Generate HyperV Image Gallery Builds in Bionic and Disco

[Launchpad Bug Tracker]

You have been subscribed to a public bug by David Krauser (davidkrauser):

[Overview]

We can generate HyperV Image Gallery builds for Eoan images with livecd-
rootfs, but not for Bionic and Disco. These images are necessary for
users to install Ubuntu on their Windows machines from the HyperV Image
Gallery:

https://ubuntu.com/blog/optimised-ubuntu-desktop-images-available-in-
microsoft-hyper-v-gallery

To support this, three commits need to be backported from ubuntu/master
to ubuntu/disco and ubuntu/bionic:

https://git.launchpad.net/livecd-rootfs/commit/?id=0e3b1e206b8ac24e22b49b40a0de1e16e3d412dd
https://git.launchpad.net/livecd-rootfs/commit/?id=124d07410161427222c002bec023b7d2ca03a465
https://git.launchpad.net/livecd-rootfs/commit/?id=5a2b49950af9bf407b333363ea6a5488500fbcc4

[Test Case]

These images can be built with the livecd-roottfs ubuntu/master branch
by specifying the ubuntu project and the desktop-preinstalled
subproject.

For example (using the ubuntu-bartender helper script in ubuntu-old-
fashioned [1]):

ubuntu-old-fashioned/scripts/ubuntu-bartender/ubuntu-bartender --
--series eoan --project ubuntu --subproject desktop-preinstalled

When backported, it's expected that these images can be built for both
disco and bionic with the same parameters specified:

ubuntu-old-fashioned/scripts/ubuntu-bartender/ubuntu-disco-bartender --
--project ubuntu --subproject desktop-preinstalled

ubuntu-old-fashioned/scripts/ubuntu-bartender/ubuntu-bionic-bartender --
--project ubuntu --subproject desktop-preinstalled

1: https://github.com/chrisglass/ubuntu-old-fashioned

[Regression Potential]

The binary hook used to create the HyperV image is isolated and
shouldn't affect other image builds; however, that hook depends on a
symbolic link to a hook in the ubuntu-cpc project. There's a possibility
of future breakage if the ubuntu-cpc project hook is modified without
taking into account its use in multiple places.

To enable the use of a symbolic link, some logic was changed in the
live-build configuration script. Previously, all files were copied over
as-is. Now, symbolic links in hook directories are dereferenced and
turned into regular files. In practice, this should only have an affect
on two files, and that affect should be safe:

livecd-rootfs $ find . -type l -print | grep hooks
./live-build/ubuntu/hooks/033-disk-image-uefi.binary
./live-build/ubuntu-cpc/hooks.d/base/series/all

This may cause undesired behavior for other users of livecd-rootfs,
though, that inject symbolic links into their hooks directory.

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

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Generate HyperV Image Gallery Builds in Bionic and Disco
https://bugs.launchpad.net/bugs/1837088
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