$ git clone -n https://src.fedoraproject.org/rpms/ghc-megaparsec.git /var/lib/mock/f41-build-838897-159867/root/chroot_tmpdir/scmroot/ghc-megaparsec
Cloning into '/var/lib/mock/f41-build-838897-159867/root/chroot_tmpdir/scmroot/ghc-megaparsec'...
$ git fetch origin 9f3c08103d30857fa00c4846ba72dd517d76bcf3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-megaparsec
 * [new ref]         9f3c08103d30857fa00c4846ba72dd517d76bcf3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f3c081 https://hackage.haskell.org/package/megaparsec-9.5.0/changelog