When doing installations without network, we need to ensure that we don't try
to perform apt operations that require internet. To do this in Plucky, we need
to temporarily copy the ubuntu.sources file to an ubuntu.sources.bak file. To
bring all of the previous commits in this upload together, we use the
bind-mounted /media/cdrom not only to install the correct GRUB packages, but
to ensure that we can still install them and any other packages on ship-live.
There has to be a better, more native way to do this. It works for now, but in
the Questing cycle, we're probably going to move some of these command-line
apt calls to be a consumer of the libapt C library (LP: #2107287).
Simply pass through packages starting with "^" or containing "*". For this
cycle we can trust our distributors won't do anything unusual, but next cycle,
we need to perform explicit validation on these items.
If you are a downstream, please be careful!
To complement the last fix, ensure that Calamares ends up on the removal list
for non-stacked squashfses if and only if OEM is disabled, and Calamares shows
up on the install list only for stacked squashfses which have OEM enabled.
This nuanced approach ensures all potential combinations have the intended
functionality.
When we are creating the final list of packages to feed to "apt install,"
virtual packages which do not have a valid candidate are included in this
list, causing the installation to fail. When creating this list, use FindGrp
instead of FindPkg, and only add it to the list if there is a valid candidate.
Additionally, add these items to an unordered set, to eliminate deduplication
(LP: #2106773).
A reliable testcase for this is the libreoffice-help-is package, at least in
Plucky.
If checkpackage-backend does not exist in the target system, likely due to the
use of stacked squashfses, ensure it temporarily exists so it can be used in
the install process. This fixes installation of the Virtual Machine Manager
when selected on the Customize menu (LP: #2104243).
