$ git clone -n https://src.fedoraproject.org/rpms/thunderbird.git /var/lib/mock/f41-build-1142068-21088/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/f41-build-1142068-21088/root/chroot_tmpdir/scmroot/thunderbird'...
$ git fetch origin ad61045735945aad8c62ee39a36ddc06ccc857ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/thunderbird
 * [new ref]         ad61045735945aad8c62ee39a36ddc06ccc857ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad61045 Update to 115.12.1