Merge remote-tracking branch 'pull2/master'

Signed-off-by: 王邈 <shankerwangmiao@gmail.com>

dockerfiles/rustup-mirror/Dockerfile

@@ -0,0 +1,5 @@
+FROM rust:1.32.0
+MAINTAINER Jiajie Chen <jiegec@noc.ac.cn>
+
+RUN cargo install rustup-mirror
+CMD /bin/bash

rustup.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -e
+
+cd "$TUNASYNC_WORKING_DIR"
+echo "rustup sync started"
+
+BASE_URL=${MIRROR_BASE_URL:-"https://mirrors.tuna.tsinghua.edu.cn/rustup"}
+
+/usr/local/cargo/bin/rustup-mirror -u "${BASE_URL}" -m "${TUNASYNC_WORKING_DIR}"
+echo "finished"