$ git clone -n https://src.fedoraproject.org/rpms/ghc-vector-algorithms.git /var/lib/mock/f40-build-2066578-49285/root/chroot_tmpdir/scmroot/ghc-vector-algorithms
Cloning into '/var/lib/mock/f40-build-2066578-49285/root/chroot_tmpdir/scmroot/ghc-vector-algorithms'...
$ git fetch origin 3629bb777507eb9f4c759e0ebb77adbc25a881d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-vector-algorithms
 * [new ref]         3629bb777507eb9f4c759e0ebb77adbc25a881d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3629bb7 subpackage bitvec