$ git clone -n https://src.fedoraproject.org/rpms/ghc-explicit-exception.git /var/lib/mock/f40-build-1997898-44188/root/chroot_tmpdir/scmroot/ghc-explicit-exception
Cloning into '/var/lib/mock/f40-build-1997898-44188/root/chroot_tmpdir/scmroot/ghc-explicit-exception'...
$ git fetch origin ba11f7a3ab2d1ae0e2a61a9b228cfb087b5b3178:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-explicit-exception
 * [new ref]         ba11f7a3ab2d1ae0e2a61a9b228cfb087b5b3178 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba11f7a https://hackage.haskell.org/package/explicit-exception-0.2/changelog