$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-ostree.git /var/lib/mock/f38-build-side-42-init-devel-1136937-30384/root/chroot_tmpdir/scmroot/ghc-gi-ostree
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1136937-30384/root/chroot_tmpdir/scmroot/ghc-gi-ostree'...
$ git fetch origin a025042b44340455f13831eef141111c12249c75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-ostree
 * [new ref]         a025042b44340455f13831eef141111c12249c75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a025042 rebuild