$ git clone -n https://src.fedoraproject.org/rpms/thunderbird.git /var/lib/mock/f41-build-side-1-2670612-29060/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/f41-build-side-1-2670612-29060/root/chroot_tmpdir/scmroot/thunderbird'...
$ git fetch origin af58745428413c87a4184741c87a7487175028f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/thunderbird
 * [new ref]         af58745428413c87a4184741c87a7487175028f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af58745 Update to 128.2.0