$ git clone -n https://src.fedoraproject.org/rpms/golang-github-facebookgo-clock.git /var/lib/mock/f45-build-11918-436/root/chroot_tmpdir/scmroot/golang-github-facebookgo-clock
Cloning into '/var/lib/mock/f45-build-11918-436/root/chroot_tmpdir/scmroot/golang-github-facebookgo-clock'...
$ git fetch origin 3c6ad848171e475759542fd08c4face9c962ea67:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-facebookgo-clock
 * [new ref]         3c6ad848171e475759542fd08c4face9c962ea67 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c6ad84 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild