$ git clone -n https://src.fedoraproject.org/rpms/ghc-microlens-th.git /var/lib/mock/f40-build-2261711-54446/root/chroot_tmpdir/scmroot/ghc-microlens-th
Cloning into '/var/lib/mock/f40-build-2261711-54446/root/chroot_tmpdir/scmroot/ghc-microlens-th'...
$ git fetch origin 5ba4572906b788e7d6145126bbee61c687b021f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-microlens-th
 * [new ref]         5ba4572906b788e7d6145126bbee61c687b021f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ba4572 https://hackage.haskell.org/package/microlens-th-0.4.3.13/changelog