Install rust for all users (#1856)

docker/Dockerfile.ci_cpu

@@ -26,6 +26,8 @@ RUN bash /install/ubuntu_install_golang.sh
 # Rust env
 COPY install/ubuntu_install_rust.sh /install/ubuntu_install_rust.sh
 RUN bash /install/ubuntu_install_rust.sh
+ENV RUSTUP_HOME /opt/rust
+ENV CARGO_HOME /opt/rust
 
 # SGX deps
 COPY install/ubuntu_install_sgx.sh /install/ubuntu_install_sgx.sh
@@ -33,4 +35,4 @@ RUN bash /install/ubuntu_install_sgx.sh
 ENV LD_LIBRARY_PATH /opt/sgxsdk/lib64:${LD_LIBRARY_PATH}
 
 
-ENV PATH $PATH:/root/.cargo/bin:/usr/lib/go-1.10/bin
+ENV PATH $PATH:$CARGO_HOME/bin:/usr/lib/go-1.10/bin

docker/install/ubuntu_install_rust.sh

 apt-get update && apt-get install -y --no-install-recommends --force-yes curl
 
-curl -sSo rustup.sh 'https://sh.rustup.rs'
-# rustc nightly-2018-08-25 is the version supported by the above version of rust-sgx-sdk
-bash rustup.sh -y --no-modify-path --default-toolchain nightly-2018-08-25
-. $HOME/.cargo/env
+export RUSTUP_HOME=/opt/rust
+export CARGO_HOME=/opt/rust
+# rustc nightly-2018-08-25 is the version supported by the rust-sgx-sdk
+curl https://sh.rustup.rs -sSf | sh -s -- -y --no-modify-path --default-toolchain nightly-2018-08-25
+. $CARGO_HOME/env
 rustup toolchain add nightly
 rustup component add rust-src
 cargo +nightly install rustfmt-nightly --version 0.99.5 --force
 cargo +nightly install xargo
+
+# make rust usable by all users
+chmod a+w /opt/rust
+sudo find /opt/rust -type d -exec chmod a+w {} \;