$ git clone -n https://src.fedoraproject.org/rpms/ghc-megaparsec.git /var/lib/mock/f40-build-2085954-50100/root/chroot_tmpdir/scmroot/ghc-megaparsec
Cloning into '/var/lib/mock/f40-build-2085954-50100/root/chroot_tmpdir/scmroot/ghc-megaparsec'...
$ git fetch origin 742238cd6b18ec6e3f3459e19e35463d7fe3587b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-megaparsec
 * [new ref]         742238cd6b18ec6e3f3459e19e35463d7fe3587b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 742238c https://hackage.haskell.org/package/megaparsec-9.3.1/changelog