$ git clone -n https://src.fedoraproject.org/rpms/gobject-introspection.git /var/lib/mock/f42-build-side-1-3498628-45963/root/chroot_tmpdir/scmroot/gobject-introspection
Cloning into '/var/lib/mock/f42-build-side-1-3498628-45963/root/chroot_tmpdir/scmroot/gobject-introspection'...
$ git fetch origin b30db01f2e08e8bf52c6dafa34362cdae8a0137a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gobject-introspection
 * [new ref]         b30db01f2e08e8bf52c6dafa34362cdae8a0137a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b30db01 Update to 1.84.0