$ git clone -n https://src.fedoraproject.org/rpms/rubygem-highline.git /var/lib/mock/f45-build-34951-692/root/chroot_tmpdir/scmroot/rubygem-highline
Cloning into '/var/lib/mock/f45-build-34951-692/root/chroot_tmpdir/scmroot/rubygem-highline'...
$ git fetch origin a333fd2a04367842a25e1a123c61373113c22bc6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-highline
 * [new ref]         a333fd2a04367842a25e1a123c61373113c22bc6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a333fd2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild