$ git clone -n https://src.fedoraproject.org/rpms/rust-cookie_store.git /var/lib/mock/f39-build-1526191-36059/root/chroot_tmpdir/scmroot/rust-cookie_store
Cloning into '/var/lib/mock/f39-build-1526191-36059/root/chroot_tmpdir/scmroot/rust-cookie_store'...
$ git fetch origin bbfdd23d65f7e3a59798e8e91b840bfa05a9c1c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cookie_store
 * [new ref]         bbfdd23d65f7e3a59798e8e91b840bfa05a9c1c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbfdd23 Regenerate with rust2rpm v24