$ git clone -n https://src.fedoraproject.org/rpms/rust-cookie.git /var/lib/mock/f39-build-2222984-52713/root/chroot_tmpdir/scmroot/rust-cookie
Cloning into '/var/lib/mock/f39-build-2222984-52713/root/chroot_tmpdir/scmroot/rust-cookie'...
$ git fetch origin 669eebab534e8ea32161356fc59c13edd23d3597:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cookie
 * [new ref]         669eebab534e8ea32161356fc59c13edd23d3597 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 669eeba Update to version 0.17.0