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Currently when an excluded package is included in a blueprint toml such as:

[[modules]]
name = "rng-tools"
version = "*"

composer-cli will fail complaining of missing packages which are clearly installed and available:

# composer-cli compose start-ostree Edge rhel-edge-commit
2021-06-02 10:37:32,685: DNF error occured: MarkingErrors: Error occurred when marking packages for installation: Problems in request:
missing packages: rng-tools

# yum list rng-tools --showduplicates
Updating Subscription Management repositories.
Last metadata expiration check: 1:20:00 ago on Wed 02 Jun 2021 09:17:55 AM EDT.
Installed Packages
rng-tools.x86_64                   6.8-3.el8                   @anaconda
Available Packages
rng-tools.x86_64                   6.6-2.el8                   rhel-8-for-x86_64-baseos-rpms
rng-tools.x86_64                   6.8-3.el8                   rhel-8-for-x86_64-baseos-rpms

The upstream PR https://github.com/osbuild/osbuild-composer/pull/1349 proposes a mechanism where the build will simply exclude the given package, but it may be helpful to also provide an override mechanism to include a given package or a configuration that was originally excluded - there is currently no mechanism to do either of these at the moment

I believe this is a duplicate of https://bugzilla.redhat.com/show_bug.cgi?id=1942425

*** This bug has been marked as a duplicate of bug 1942425 ***