$ git clone -n https://src.fedoraproject.org/rpms/ghc-vty.git /var/lib/mock/f40-build-743150-111091/root/chroot_tmpdir/scmroot/ghc-vty
Cloning into '/var/lib/mock/f40-build-743150-111091/root/chroot_tmpdir/scmroot/ghc-vty'...
$ git fetch origin 34f42f894b05d5b755af2b2b6b12208cb427f0ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-vty
 * [new ref]         34f42f894b05d5b755af2b2b6b12208cb427f0ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34f42f8 https://hackage.haskell.org/package/vty-5.38/changelog