$ git clone -n https://src.fedoraproject.org/rpms/rubygem-pastel.git /var/lib/mock/f45-build-35145-693/root/chroot_tmpdir/scmroot/rubygem-pastel
Cloning into '/var/lib/mock/f45-build-35145-693/root/chroot_tmpdir/scmroot/rubygem-pastel'...
$ git fetch origin 9291ca344586e588a4150aea5c06a16696d230a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-pastel
 * [new ref]         9291ca344586e588a4150aea5c06a16696d230a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9291ca3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild