$ git clone -n https://src.fedoraproject.org/rpms/ghc-MonadCatchIO-mtl.git /var/lib/mock/f41-build-side-1-2805254-32863/root/chroot_tmpdir/scmroot/ghc-MonadCatchIO-mtl
Cloning into '/var/lib/mock/f41-build-side-1-2805254-32863/root/chroot_tmpdir/scmroot/ghc-MonadCatchIO-mtl'...
$ git fetch origin ffd15c1572a27a997413ec43a1b1f4a5a731152f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-MonadCatchIO-mtl
 * [new ref]         ffd15c1572a27a997413ec43a1b1f4a5a731152f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffd15c1 FTBFS and last release over 10 years ago