$ git clone -n https://src.fedoraproject.org/rpms/golang-github-mattn-tty.git /var/lib/mock/f45-build-12245-440/root/chroot_tmpdir/scmroot/golang-github-mattn-tty
Cloning into '/var/lib/mock/f45-build-12245-440/root/chroot_tmpdir/scmroot/golang-github-mattn-tty'...
$ git fetch origin 219559f5c829c2103a214b347bcbf14855376d49:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-mattn-tty
 * [new ref]         219559f5c829c2103a214b347bcbf14855376d49 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 219559f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild