$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-gmodule.git /var/lib/mock/f41-build-1020907-18021/root/chroot_tmpdir/scmroot/ghc-gi-gmodule
Cloning into '/var/lib/mock/f41-build-1020907-18021/root/chroot_tmpdir/scmroot/ghc-gi-gmodule'...
$ git fetch origin 8713359fcf09eabb3185d3c6479c49833804d287:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-gmodule
 * [new ref]         8713359fcf09eabb3185d3c6479c49833804d287 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8713359 cabal-rpm-2.1.5