$ git clone -n https://src.fedoraproject.org/rpms/vdr-osd2web.git /var/lib/mock/f42-build-863058-171350/root/chroot_tmpdir/scmroot/vdr-osd2web
Cloning into '/var/lib/mock/f42-build-863058-171350/root/chroot_tmpdir/scmroot/vdr-osd2web'...
$ git fetch origin 40992454115a98e1e2add25a6a33c525aea96259:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-osd2web
 * [new ref]         40992454115a98e1e2add25a6a33c525aea96259 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4099245 rebuild for tinyxml2