$ git clone -n https://src.fedoraproject.org/rpms/kiwi.git /var/lib/mock/f42-build-side-1-3498664-45963/root/chroot_tmpdir/scmroot/kiwi
Cloning into '/var/lib/mock/f42-build-side-1-3498664-45963/root/chroot_tmpdir/scmroot/kiwi'...
$ git fetch origin 57121ca740763e80d357540d173fe583e0c112f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kiwi
 * [new ref]         57121ca740763e80d357540d173fe583e0c112f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57121ca Backport fixes for container image filenames and filtering files in ESP images