$ git clone -n https://src.fedoraproject.org/rpms/rust-memmap2_0.5.git /var/lib/mock/f38-build-side-43-rust-devel-1409820-31406/root/chroot_tmpdir/scmroot/rust-memmap2_0.5
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1409820-31406/root/chroot_tmpdir/scmroot/rust-memmap2_0.5'...
$ git fetch origin 7b33844f3d20289c4da96c5782d553b5bc2c2e6f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-memmap2_0.5
 * [new ref]         7b33844f3d20289c4da96c5782d553b5bc2c2e6f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b33844 Initial import (memmap2 0.5 compat package)