$ git clone -n https://src.fedoraproject.org/rpms/rust-argmax.git /var/lib/mock/f45-build-40121-768/root/chroot_tmpdir/scmroot/rust-argmax
Cloning into '/var/lib/mock/f45-build-40121-768/root/chroot_tmpdir/scmroot/rust-argmax'...
$ git fetch origin 6e4c1e146232ce3fde0b76fb77e6fc002b445b05:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-argmax
 * [new ref]         6e4c1e146232ce3fde0b76fb77e6fc002b445b05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e4c1e1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild