$ git clone -n https://src.fedoraproject.org/rpms/ptlib.git /var/lib/mock/f41-build-833876-14943/root/chroot_tmpdir/scmroot/ptlib
Cloning into '/var/lib/mock/f41-build-833876-14943/root/chroot_tmpdir/scmroot/ptlib'...
$ git fetch origin d17917edd70471b1acc5023e470c9d8672c33bbe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ptlib
 * [new ref]         d17917edd70471b1acc5023e470c9d8672c33bbe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d17917e Eliminate use of obsolete %patchN syntax (#2283636)