$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Unit-Lite.git /var/lib/mock/f45-build-26988-620/root/chroot_tmpdir/scmroot/perl-Test-Unit-Lite
Cloning into '/var/lib/mock/f45-build-26988-620/root/chroot_tmpdir/scmroot/perl-Test-Unit-Lite'...
$ git fetch origin 64a7dee493876e4d7f38a6130c42af059f1ad5d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Unit-Lite
 * [new ref]         64a7dee493876e4d7f38a6130c42af059f1ad5d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64a7dee Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild