$ git clone -n https://src.fedoraproject.org/rpms/knot.git /var/lib/mock/f38-build-side-42-init-devel-809458-28255/root/chroot_tmpdir/scmroot/knot
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-809458-28255/root/chroot_tmpdir/scmroot/knot'...
$ git fetch origin e87a1b23b53f6ce7ba5083a8f06401efb8462700:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/knot
 * [new ref]         e87a1b23b53f6ce7ba5083a8f06401efb8462700 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e87a1b2 Release 3.2.6-1