$ git clone -n https://src.fedoraproject.org/rpms/ghc-clientsession.git /var/lib/mock/f40-build-743552-111265/root/chroot_tmpdir/scmroot/ghc-clientsession
Cloning into '/var/lib/mock/f40-build-743552-111265/root/chroot_tmpdir/scmroot/ghc-clientsession'...
$ git fetch origin 26b0a47d808593687c28eac1c88a161f16d1c49c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-clientsession
 * [new ref]         26b0a47d808593687c28eac1c88a161f16d1c49c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26b0a47 https://hackage.haskell.org/package/clientsession-0.9.2.0/changelog