$ git clone -n https://src.fedoraproject.org/rpms/ghex.git /var/lib/mock/f39-build-1559866-37326/root/chroot_tmpdir/scmroot/ghex
Cloning into '/var/lib/mock/f39-build-1559866-37326/root/chroot_tmpdir/scmroot/ghex'...
$ git fetch origin c1e09b3c09f766457e1f1ba088c3c55f5c7d3416:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghex
 * [new ref]         c1e09b3c09f766457e1f1ba088c3c55f5c7d3416 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c1e09b3 Update to 45.0