$ git clone -n https://src.fedoraproject.org/rpms/ghc-attoparsec.git /var/lib/mock/f41-build-838898-159867/root/chroot_tmpdir/scmroot/ghc-attoparsec
Cloning into '/var/lib/mock/f41-build-838898-159867/root/chroot_tmpdir/scmroot/ghc-attoparsec'...
$ git fetch origin 5d5048f6a59386fc133bacd3b96a478306824fc7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-attoparsec
 * [new ref]         5d5048f6a59386fc133bacd3b96a478306824fc7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d5048f refresh .cabal revision