Refactor travis: Build on minimal image

.travis.yml

@@ -1,21 +1,33 @@
-sudo: false
-language: rust
+# Request an environment that provides sudo (that goes with larger containers)
+# and a minimal language environment.
+sudo: true
+language: minimal
+
+cache: cargo
+
 branches:
   only:
   - master
 
-cache: cargo
+env:
+  global:
+    - RUST_BACKTRACE=1
+  matrix:
+    - RUST_TOOLCHAIN=nightly TARGET=wasm
+    - RUST_TOOLCHAIN=stable TARGET=native
 
-matrix:
-  fast_finish: false
-  include:
-    - rust: stable
+before_install:
+  # Check how much space we've got on this machine.
+  - df -h
 
 script:
-  - cargo test --all
-  - cargo clean
-  - ./init.sh
-  - ./build.sh
-  - if [ "$TRAVIS_PULL_REQUEST" != "true" ] && [ "$TRAVIS_BRANCH" == "master" ]; then
-      ./publish-wasm.sh;
+  - ./ci/script.sh
+
+after_success:
+  - if [ "$TARGET" == "wasm" ] && [ "$TRAVIS_PULL_REQUEST" != "true" ] && [ "$TRAVIS_BRANCH" == "master" ]; then
+      ./ci/publish-wasm.sh;
     fi
+
+after_script:
+  # Check how much free disk space left after the build
+  - df -h

publish-wasm.sh → ci/publish-wasm.sh

@@ -6,7 +6,7 @@
 
 set -e
 
-source `dirname "$0"`/common.sh
+source ./common.sh
 
 if [ -z ${GH_TOKEN+x} ]; then
 	echo "GH_TOKEN environment variable is not set"

ci/script.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -eux
+
+# Install rustup and the specified rust toolchain.
+curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain=$RUST_TOOLCHAIN -y
+
+# Load cargo environment. Specifically, put cargo into PATH.
+source ~/.cargo/env
+
+rustc --version
+rustup --version
+cargo --version
+
+case $TARGET in
+	"native")
+		sudo apt-get -y update
+		sudo apt-get install -y cmake pkg-config libssl-dev
+
+		cargo test --all
+		;;
+
+	"wasm")
+		# Install prerequisites and build all wasm projects
+		./init.sh
+		./build.sh
+		;;
+esac