$ git clone -n https://src.fedoraproject.org/rpms/rust-struct-patch-derive.git /var/lib/mock/f38-build-side-43-rust-devel-1416456-31457/root/chroot_tmpdir/scmroot/rust-struct-patch-derive
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1416456-31457/root/chroot_tmpdir/scmroot/rust-struct-patch-derive'...
$ git fetch origin be062a9bb42f18403598baafc608277a6a83bc52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-struct-patch-derive
 * [new ref]         be062a9bb42f18403598baafc608277a6a83bc52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be062a9 Initial import (#2227543)