$ git clone -n https://src.fedoraproject.org/rpms/plasma-browser-integration.git /var/lib/mock/f42-build-side-1-3587421-46931/root/chroot_tmpdir/scmroot/plasma-browser-integration
Cloning into '/var/lib/mock/f42-build-side-1-3587421-46931/root/chroot_tmpdir/scmroot/plasma-browser-integration'...
$ git fetch origin dbef167072e3cd84e27bea4ba2aea6a289209238:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-browser-integration
 * [new ref]         dbef167072e3cd84e27bea4ba2aea6a289209238 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dbef167 6.4.2