Description of problem:
When attempting to remove a package that is a dependency of a protected package, the error returned does not make it obvious the reason it is blocked is because it would result in the removal of a protected package.
Version-Release number of selected component (if applicable):
2.0.0-1.mga6 (= 2.0.0-1.fc26)
Steps to Reproduce:
1. Run sudo dnf remove gnupg2
Error: package python3-gpgme-0.3-9.mga6.x86_64 requires libgpgme.so.11()(64bit), but none of the providers can be installed
- package python3-dnf-2.0.0-1.mga6.noarch requires python3-gpgme, but none of the providers can be installed
- package lib64gpgme11-1.8.0-8.mga6.x86_64 requires gnupg2 >= 1.9.6, but none of the providers can be installed
- package dnf-2.0.0-1.mga6.noarch requires python3-dnf = 2.0.0-1.mga6, but none of the providers can be installed
- conflicting requests
- problem with installed package dnf-2.0.0-1.mga6.noarch
Some detailed error showing the dependency chain resulting in showing that it would cause the removal of dnf, which is not allowed as it is a protected package.
This error should be just as reproducible in Fedora Rawhide, as gnupg2 is an indirect dependency of dnf, and dnf declares itself protected by default.
Thanks for the report. It could be improved by extending set of protected packages recursively by it's dependencies before checking the set for removals.
Another aspect of it would be to make it so that the error statement doesn't look like it's trying to install something. Initially I was confused by the error because it looked like an install dependency error (even though I was attempting to remove a package). The problem statements printed should be in the correct context (that is, showing the broken reverse dependency chain from the proposed removal action).
So I would say this and Honza's suggestion in Comment 1 would essentially solve the problem.
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.
I created pull request (https://github.com/rpm-software-management/libdnf/pull/295) that should improve the behavior. Unfortunately it can report only one protected package in transaction. I do not know what was supposed solution, but my solution was not an easy fix. Have a fun with testing.
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This bug appears to have been reported against 'rawhide' during the Fedora 29 development cycle.
Changing version to '29'.
Problem fixed in libdnf-0.10.0