$ git clone -n https://src.fedoraproject.org/rpms/ghc-ed25519.git /var/lib/mock/f41-build-side-1-2636665-26251/root/chroot_tmpdir/scmroot/ghc-ed25519
Cloning into '/var/lib/mock/f41-build-side-1-2636665-26251/root/chroot_tmpdir/scmroot/ghc-ed25519'...
$ git fetch origin 1fcb9ef24938d0cf9b1f0d75fa7afa145aadbb6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-ed25519
 * [new ref]         1fcb9ef24938d0cf9b1f0d75fa7afa145aadbb6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1fcb9ef refresh .cabal revision