$ git clone -n https://src.fedoraproject.org/rpms/ruby-taglib.git /var/lib/mock/f45-build-34738-691/root/chroot_tmpdir/scmroot/ruby-taglib
Cloning into '/var/lib/mock/f45-build-34738-691/root/chroot_tmpdir/scmroot/ruby-taglib'...
$ git fetch origin eb2751da4b7e14858f2df990457220c3c00e6d14:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ruby-taglib
 * [new ref]         eb2751da4b7e14858f2df990457220c3c00e6d14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb2751d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild