$ git clone -n https://src.fedoraproject.org/rpms/i3.git /var/lib/mock/f40-build-2004400-44948/root/chroot_tmpdir/scmroot/i3
Cloning into '/var/lib/mock/f40-build-2004400-44948/root/chroot_tmpdir/scmroot/i3'...
$ git fetch origin bcdb90d934cf22c7f5ca93f382b3042fe2b307ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/i3
 * [new ref]         bcdb90d934cf22c7f5ca93f382b3042fe2b307ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bcdb90d New upstream release 4.23, fixes rhbz#2246843