$ git clone -n https://src.fedoraproject.org/rpms/timescaledb.git /var/lib/mock/f41-build-side-1-2670641-29060/root/chroot_tmpdir/scmroot/timescaledb
Cloning into '/var/lib/mock/f41-build-side-1-2670641-29060/root/chroot_tmpdir/scmroot/timescaledb'...
$ git fetch origin 1c75a879caf79a4364f379c1877b1f1566c9a187:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/timescaledb
 * [new ref]         1c75a879caf79a4364f379c1877b1f1566c9a187 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c75a87 Rebase to the latest upstream version (rhbz#2302504)