$ git clone -n https://src.fedoraproject.org/rpms/rust-cookie.git /var/lib/mock/f38-build-side-43-rust-devel-1417872-31459/root/chroot_tmpdir/scmroot/rust-cookie
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417872-31459/root/chroot_tmpdir/scmroot/rust-cookie'...
$ git fetch origin c9c7e609c61f25bb117adca8d7b50222e240f5e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cookie
 * [new ref]         c9c7e609c61f25bb117adca8d7b50222e240f5e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c9c7e60 Update to version 0.16.1