$ git clone -n https://src.fedoraproject.org/rpms/golang-github-johncgriffin-overflow.git /var/lib/mock/f45-build-12102-437/root/chroot_tmpdir/scmroot/golang-github-johncgriffin-overflow
Cloning into '/var/lib/mock/f45-build-12102-437/root/chroot_tmpdir/scmroot/golang-github-johncgriffin-overflow'...
$ git fetch origin 147725833465fbb01ad1a158afc77f5537eafae2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-johncgriffin-overflow
 * [new ref]         147725833465fbb01ad1a158afc77f5537eafae2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1477258 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild