$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-ostree.git /var/lib/mock/f40-build-2430359-60608/root/chroot_tmpdir/scmroot/ghc-gi-ostree
Cloning into '/var/lib/mock/f40-build-2430359-60608/root/chroot_tmpdir/scmroot/ghc-gi-ostree'...
$ git fetch origin 35962537149bccee3c43b73ac07b4a23ccbc0fca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-ostree
 * [new ref]         35962537149bccee3c43b73ac07b4a23ccbc0fca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3596253 Rebuild with haskell-gi-0.26.8