Update install.sh

Author: bbartels

src/rust/install.sh

@@ -376,11 +376,13 @@ else
         fi
         default_toolchain_arg="--default-toolchain ${RUST_VERSION}"
     fi
+    export RUSTUP_DIST_SERVER="${RUSTUP_DIST_SERVER:-https://static.rust-lang.org}"
+    export RUSTUP_UPDATE_ROOT="${RUSTUP_UPDATE_ROOT:-https://static.rust-lang.org/rustup}"
     echo "Installing Rust..."
     # Download and verify rustup sha
     mkdir -p /tmp/rustup/target/${download_architecture}-unknown-linux-gnu/release/
-    curl -sSL --proto '=https' --tlsv1.2 "https://static.rust-lang.org/rustup/dist/${download_architecture}-unknown-linux-gnu/rustup-init" -o /tmp/rustup/target/${download_architecture}-unknown-linux-gnu/release/rustup-init
-    curl -sSL --proto '=https' --tlsv1.2 "https://static.rust-lang.org/rustup/dist/${download_architecture}-unknown-linux-gnu/rustup-init.sha256" -o /tmp/rustup/rustup-init.sha256
+    curl -sSL --proto '=https' --tlsv1.2 "${RUSTUP_DIST_SERVER}/rustup/dist/${download_architecture}-unknown-linux-gnu/rustup-init" -o /tmp/rustup/target/${download_architecture}-unknown-linux-gnu/release/rustup-init
+    curl -sSL --proto '=https' --tlsv1.2 "${RUSTUP_DIST_SERVER}/rustup/dist/${download_architecture}-unknown-linux-gnu/rustup-init.sha256" -o /tmp/rustup/rustup-init.sha256
     cd /tmp/rustup
     cp /tmp/rustup/target/${download_architecture}-unknown-linux-gnu/release/rustup-init  /tmp/rustup/rustup-init
     sha256sum -c rustup-init.sha256
@@ -390,9 +392,6 @@ else
     rm -rf /tmp/rustup
 fi
 
-export RUSTUP_DIST_SERVER="${RUSTUP_DIST_SERVER:-https://static.rust-lang.org}"
-export RUSTUP_UPDATE_ROOT="${RUSTUP_UPDATE_ROOT:-https://static.rust-lang.org/rustup}"
-
 export PATH=${CARGO_HOME}/bin:${PATH}
 if [ "${UPDATE_RUST}" = "true" ]; then
     echo "Updating Rust..."