$ git clone -n https://src.fedoraproject.org/rpms/rust-smithay-client-toolkit.git /var/lib/mock/f39-build-2239573-53616/root/chroot_tmpdir/scmroot/rust-smithay-client-toolkit
Cloning into '/var/lib/mock/f39-build-2239573-53616/root/chroot_tmpdir/scmroot/rust-smithay-client-toolkit'...
$ git fetch origin 75fe33a797dc9de42e35fe804455f945e2aced29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-smithay-client-toolkit
 * [new ref]         75fe33a797dc9de42e35fe804455f945e2aced29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75fe33a Update to 0.18.0 (rhbz#2098370)