[issue-15] reasonably support older linux distributions

Author: JustinVenus

Dockerfile

@@ -1,6 +1,21 @@
-FROM jimmycuadra/rust:1.16.0
+FROM alexcrichton/rust-slave-dist:2015-10-20b
 
-RUN mkdir -p /rust/app
+USER root
+ENV RUST_VERSION 1.16.0
+
+RUN mkdir -p /rust/app && \
+    unlink /rustroot/lib64/libgcc_s.so && \
+    rm /rustroot/lib64/libgcc_s.so.1 && \
+    ln -sf /lib64/libgcc_s.so.1 /lib64/libgcc_s.so && \
+    curl -sO https://static.rust-lang.org/dist/rust-$RUST_VERSION-x86_64-unknown-linux-gnu.tar.gz && \
+    tar -xzf rust-$RUST_VERSION-x86_64-unknown-linux-gnu.tar.gz && \
+    ./rust-$RUST_VERSION-x86_64-unknown-linux-gnu/install.sh --without=rust-docs && \
+    rm -rf \
+    rust-$RUST_VERSION-x86_64-unknown-linux-gnu \
+    rust-$RUST_VERSION-x86_64-unknown-linux-gnu.tar.gz \
+    /var/lib/apt/lists/* \
+    /tmp/* \
+    /var/tmp/*
 WORKDIR /rust/app
 
 ENV TARGET=x86_64-unknown-linux-gnu