Implement command provides

[inknos]

This pr targets partially if not all #147

test: rpm-software-management/ci-dnf-stack#1408

---

This introduces error codes for provides and slightly different error
messages.

Examples.

• All packages match:

dnf provides dnf rpm libdnf -> exit code 0
<provides output>

• One package queried and it doesn't match:

dnf provides nonexistent_pkg -> exit code 1
No matches found. If searching for a file, try specifying the full path or using a wildcard prefix ("*/") at the beginning.

• Some packages match, some don't match:

dnf provides dnf nonexistent_pkg -> exit code 1
<provides output>
No matches found for nonexistent_pkg.
If searching for a file, try specifying the full path or using a wildcard prefix ("*/") at the beginning.

• All queried packages don't match:

dnf provides nonexistent_pkg_1 nonexistent_pkg_2 -> exit code 1
<provides output>
No matches found. If searching for a file, try specifying the full path or using a wildcard prefix ("*/") at the beginning.

[jan-kolarik]

Hmm, not sure what's going on, but I cannot compile it locally:

/usr/bin/ld: CMakeFiles/dnf5.dir/main.cpp.o: in function `dnf5::ProvidesCommand::ProvidesCommand(dnf5::Context&)':
/home/kolage/Projects/swm-devel/dnf5/dnf5/commands/provides/provides.hpp:32: undefined reference to `vtable for dnf5::ProvidesCommand'
collect2: error: ld returned 1 exit status

I've already tried to cleanup and wipe my ccache, but still it remains unbuildable for me.

Looking into the overridden methods for the ProvidesCommand, everything looks good to me.

[jan-kolarik]

Hmm, not sure what's going on, but I cannot compile it locally:

/usr/bin/ld: CMakeFiles/dnf5.dir/main.cpp.o: in function `dnf5::ProvidesCommand::ProvidesCommand(dnf5::Context&)':
/home/kolage/Projects/swm-devel/dnf5/dnf5/commands/provides/provides.hpp:32: undefined reference to `vtable for dnf5::ProvidesCommand'
collect2: error: ld returned 1 exit status

I've already tried to cleanup and wipe my ccache, but still it remains unbuildable for me.

Looking into the overridden methods for the ProvidesCommand, everything looks good to me.

So it's just a problem on my local machine, I've tried compiling with 1MT VM and it went OK.

[jan-kolarik]

LGTM, thank you!