diff --git a/src/ci/docker/cross/Dockerfile b/src/ci/docker/cross/Dockerfile
index 7759d91e1bb63..b4399a8d53ff0 100644
--- a/src/ci/docker/cross/Dockerfile
+++ b/src/ci/docker/cross/Dockerfile
@@ -21,14 +21,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   libssl-dev \
   pkg-config
 
-RUN curl -o /usr/local/bin/sccache \
-      https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl && \
-      chmod +x /usr/local/bin/sccache
-
-RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
-    dpkg -i dumb-init_*.deb && \
-    rm dumb-init_*.deb
-ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+# dumb-init
+COPY scripts/dumb-init.sh /scripts/
+RUN sh /scripts/dumb-init.sh
 
 WORKDIR /tmp
 
@@ -38,23 +33,11 @@ RUN ./build-rumprun.sh
 COPY cross/build-arm-musl.sh /tmp/
 RUN ./build-arm-musl.sh
 
-# originally from
-# https://downloads.openwrt.org/snapshots/trunk/ar71xx/generic/OpenWrt-Toolchain-ar71xx-generic_gcc-5.3.0_musl-1.1.16.Linux-x86_64.tar.bz2
-RUN mkdir /usr/local/mips-linux-musl
-RUN curl -L https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/OpenWrt-Toolchain-ar71xx-generic_gcc-5.3.0_musl-1.1.16.Linux-x86_64.tar.bz2 | \
-      tar xjf - -C /usr/local/mips-linux-musl --strip-components=2
-RUN for file in /usr/local/mips-linux-musl/bin/mips-openwrt-linux-*; do \
-      ln -s $file /usr/local/bin/`basename $file`; \
-    done
+COPY cross/install-mips-musl.sh /tmp/
+RUN ./install-mips-musl.sh
 
-# Note that this originally came from:
-# https://downloads.openwrt.org/snapshots/trunk/malta/generic/OpenWrt-Toolchain-malta-le_gcc-5.3.0_musl-1.1.15.Linux-x86_64.tar.bz2
-RUN mkdir /usr/local/mipsel-linux-musl
-RUN curl -L https://s3.amazonaws.com/rust-lang-ci/libc/OpenWrt-Toolchain-malta-le_gcc-5.3.0_musl-1.1.15.Linux-x86_64.tar.bz2 | \
-      tar xjf - -C /usr/local/mipsel-linux-musl --strip-components=2
-RUN for file in /usr/local/mipsel-linux-musl/bin/mipsel-openwrt-linux-*; do \
-      ln -s $file /usr/local/bin/`basename $file`; \
-    done
+COPY cross/install-mipsel-musl.sh /tmp/
+RUN ./install-mipsel-musl.sh
 
 ENV TARGETS=asmjs-unknown-emscripten
 ENV TARGETS=$TARGETS,wasm32-unknown-emscripten
@@ -80,3 +63,10 @@ ENV RUST_CONFIGURE_ARGS \
       --musl-root-armhf=/usr/local/arm-linux-musleabihf \
       --musl-root-armv7=/usr/local/armv7-linux-musleabihf
 ENV SCRIPT python2.7 ../x.py dist --target $TARGETS
+
+# sccache
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+# init
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
diff --git a/src/ci/docker/cross/install-mips-musl.sh b/src/ci/docker/cross/install-mips-musl.sh
new file mode 100755
index 0000000000000..416bb75155e74
--- /dev/null
+++ b/src/ci/docker/cross/install-mips-musl.sh
@@ -0,0 +1,24 @@
+# Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution and at
+# http://rust-lang.org/COPYRIGHT.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+set -ex
+
+mkdir /usr/local/mips-linux-musl
+
+# originally from
+# https://downloads.openwrt.org/snapshots/trunk/ar71xx/generic/
+# OpenWrt-Toolchain-ar71xx-generic_gcc-5.3.0_musl-1.1.16.Linux-x86_64.tar.bz2
+URL="https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror"
+FILE="OpenWrt-Toolchain-ar71xx-generic_gcc-5.3.0_musl-1.1.16.Linux-x86_64.tar.bz2"
+curl -L "$URL/$FILE" | tar xjf - -C /usr/local/mips-linux-musl --strip-components=2
+
+for file in /usr/local/mips-linux-musl/bin/mips-openwrt-linux-*; do
+  ln -s $file /usr/local/bin/`basename $file`
+done
diff --git a/src/ci/docker/cross/install-mipsel-musl.sh b/src/ci/docker/cross/install-mipsel-musl.sh
new file mode 100755
index 0000000000000..9744b242fb919
--- /dev/null
+++ b/src/ci/docker/cross/install-mipsel-musl.sh
@@ -0,0 +1,24 @@
+# Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution and at
+# http://rust-lang.org/COPYRIGHT.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+set -ex
+
+mkdir /usr/local/mipsel-linux-musl
+
+# Note that this originally came from:
+# https://downloads.openwrt.org/snapshots/trunk/malta/generic/
+# OpenWrt-Toolchain-malta-le_gcc-5.3.0_musl-1.1.15.Linux-x86_64.tar.bz2
+URL="https://s3.amazonaws.com/rust-lang-ci/libc"
+FILE="OpenWrt-Toolchain-malta-le_gcc-5.3.0_musl-1.1.15.Linux-x86_64.tar.bz2"
+curl -L "$URL/$FILE" | tar xjf - -C /usr/local/mipsel-linux-musl --strip-components=2
+
+for file in /usr/local/mipsel-linux-musl/bin/mipsel-openwrt-linux-*; do
+  ln -s $file /usr/local/bin/`basename $file`
+done