$ git clone -n https://src.fedoraproject.org/rpms/ghc-bifunctors.git /var/lib/mock/f40-build-744380-111705/root/chroot_tmpdir/scmroot/ghc-bifunctors
Cloning into '/var/lib/mock/f40-build-744380-111705/root/chroot_tmpdir/scmroot/ghc-bifunctors'...
$ git fetch origin 782489a7944baf884c47df21aec68544de4ce1b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-bifunctors
 * [new ref]         782489a7944baf884c47df21aec68544de4ce1b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 782489a https://hackage.haskell.org/package/bifunctors-5.5.15/changelog