$ git clone -n https://src.fedoraproject.org/rpms/rust-pmac.git /var/lib/mock/f45-build-43936-809/root/chroot_tmpdir/scmroot/rust-pmac
Cloning into '/var/lib/mock/f45-build-43936-809/root/chroot_tmpdir/scmroot/rust-pmac'...
$ git fetch origin 9157db7996f04efadf4bb6a4e093c90639f44cf9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pmac
 * [new ref]         9157db7996f04efadf4bb6a4e093c90639f44cf9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9157db7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild