$ git clone -n https://src.fedoraproject.org/rpms/rust-atk.git /var/lib/mock/f42-build-3228017-41182/root/chroot_tmpdir/scmroot/rust-atk
Cloning into '/var/lib/mock/f42-build-3228017-41182/root/chroot_tmpdir/scmroot/rust-atk'...
$ git fetch origin cca948e7c6d724e5948d1e23911e3b7e30ec78c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-atk
 * [new ref]         cca948e7c6d724e5948d1e23911e3b7e30ec78c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cca948e Update to version 0.18.2; Fixes RHBZ#2331144