$ git clone -n https://src.fedoraproject.org/rpms/perl-CSS-Tiny.git /var/lib/mock/f45-build-22106-589/root/chroot_tmpdir/scmroot/perl-CSS-Tiny
Cloning into '/var/lib/mock/f45-build-22106-589/root/chroot_tmpdir/scmroot/perl-CSS-Tiny'...
$ git fetch origin da74f0044db4c7361d982df09cb7092e3c0f21e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CSS-Tiny
 * [new ref]         da74f0044db4c7361d982df09cb7092e3c0f21e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da74f00 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild