$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-ostree.git /var/lib/mock/f40-build-744985-111932/root/chroot_tmpdir/scmroot/ghc-gi-ostree
Cloning into '/var/lib/mock/f40-build-744985-111932/root/chroot_tmpdir/scmroot/ghc-gi-ostree'...
$ git fetch origin 234199e94a98777dd232831a008225278fdd8e08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-ostree
 * [new ref]         234199e94a98777dd232831a008225278fdd8e08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 234199e https://hackage.haskell.org/package/gi-ostree-1.0.18/changelog