Copr changelog entry with link to package build

Changelog

Name: foo
Version: 1.0.0
Release: 1
Summary: foo
License: GPL

%description
some desc



















%changelog
* Tue Jan 04 2022 LLVM snapshot build
- Snapshot build of version 1.0.0

some.spec

Name: foo
Version: 1.0.0
Release: 1
Summary: foo
License: GPL

%description
some desc

# Check if we're building with copr
%if 0%{?copr_projectname:1}

# Remove the .copr prefix that is added here infront the build ID
# see https://pagure.io/copr/copr/blob/main/f/rpmbuild/mock.cfg.j2#_22-25
%global copr_build_id %{lua: print(string.sub(rpm.expand("%buildtag"), 6))}

%global llvm_snapshot_build_link https://copr.fedorainfracloud.org/coprs/build/%{copr_build_id}/

%endif

# This prints a multiline string for the changelog entry
%{lua: function _llvm_snapshot_changelog_entry()
    print("* ")
    print(os.date("%a %b %d %Y"))
    print(" LLVM snapshot build\n")
    print("- Snapshot build of version ")
    print(rpm.expand("%version"))
    print("\n\n")
    if rpm.isdefined("llvm_snapshot_build_link") then
        print(" (")
        print(rpm.expand("%llvm_snapshot_build_link"))
        print(")")
    end
end}

%global llvm_snapshot_changelog_entry %{lua: _llvm_snapshot_changelog_entry()}

# ...

%changelog
%{?llvm_snapshot_changelog_entry}