$ git clone -n https://src.fedoraproject.org/rpms/rust-vm-fdt.git /var/lib/mock/f38-build-side-43-rust-devel-1418350-31459/root/chroot_tmpdir/scmroot/rust-vm-fdt
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1418350-31459/root/chroot_tmpdir/scmroot/rust-vm-fdt'...
$ git fetch origin 5d78aa2f86980be13b5c1723cdfbe1a841d6d7a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vm-fdt
 * [new ref]         5d78aa2f86980be13b5c1723cdfbe1a841d6d7a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d78aa2 Enable running the slower tests.