Synchronize CI with upstream trust configuration

.travis.yml

@@ -86,13 +86,17 @@ matrix:
       os: osx
       rust: nightly
 
+before_install: set -e
+
 install:
   - sh ci/install.sh
   - source ~/.cargo/env || true
 
 script:
   - bash ci/script.sh
 
+after_script: set +e
+
 before_deploy:
   - sh ci/before_deploy.sh
 

ci/install.sh

@@ -1,23 +1,26 @@
 set -ex
 
 main() {
-    curl https://sh.rustup.rs -sSf | \
-        sh -s -- -y --default-toolchain $TRAVIS_RUST_VERSION
-
     local target=
     if [ $TRAVIS_OS_NAME = linux ]; then
-        target=x86_64-unknown-linux-gnu
+        target=x86_64-unknown-linux-musl
+        sort=sort
     else
         target=x86_64-apple-darwin
+        sort=gsort  # for `sort --sort-version`, from brew's coreutils.
     fi
 
-    # TODO At some point you'll probably want to use a newer release of `cross`,
-    # simply change the argument to `--tag`.
+    # This fetches latest stable release
+    local tag=$(git ls-remote --tags --refs --exit-code https://github.com/japaric/cross \
+                       | cut -d/ -f3 \
+                       | grep -E '^v[0.1.0-9.]+$' \
+                       | $sort --version-sort \
+                       | tail -n1)
     curl -LSfs https://japaric.github.io/trust/install.sh | \
         sh -s -- \
            --force \
            --git japaric/cross \
-           --tag v0.1.4 \
+           --tag $tag \
            --target $target
 }