$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_cp.git /var/lib/mock/f40-build-781185-131446/root/chroot_tmpdir/scmroot/rust-uu_cp
Cloning into '/var/lib/mock/f40-build-781185-131446/root/chroot_tmpdir/scmroot/rust-uu_cp'...
$ git fetch origin 904653b48f09181b9476afef6e2b18b21018e267:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_cp
 * [new ref]         904653b48f09181b9476afef6e2b18b21018e267 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 904653b Initial package (rhbz#2257192)