Trust/cross compiled test targets

.travis.yml

@@ -1,34 +1,86 @@
 language: rust
 sudo: false
 
+# We aim to test all the following in any combination:
+# - standard tests, benches, documentation, all available features
+# - pinned stable, latest stable, beta and nightly Rust releases
+# - Linux, OS X, Android, iOS, bare metal (i.e. no_std)
+# - x86_64, ARMv7, a Big-Endian arch (MIPS)
 matrix:
   include:
     - rust: 1.22.0
+      install:
       script:
-        - cargo test
-        - cargo build --no-default-features # we cannot exclude doc tests
-    - rust: stable
+        - cargo test --all --tests --no-default-features
+        - cargo test --all --features serde-1,log
     - rust: stable
       os: osx
+      install:
+      script:
+        - cargo test --all --tests --no-default-features
+        - cargo test --all --features serde-1,log
     - rust: beta
+      install:
+      script:
+        - cargo test --all --tests --no-default-features
     - rust: nightly
-
-    - rust: nightly
+      install:
       before_script:
         - pip install 'travis-cargo<0.2' --user && export PATH=$HOME/.local/bin:$PATH
       script:
-        - cargo doc --no-deps --all-features
-        - cargo test --benches
-        - cargo test --features nightly
         - cargo test --tests --no-default-features --features=alloc
+        - cargo test --all --features serde-1,log,nightly
+        - cargo test --benches
+        - cargo doc --no-deps --all-features
       after_success:
         - travis-cargo --only nightly doc-upload
+
+    # Trust cross-built/emulated targets. We must repeat all non-default values.
+    - rust: stable
+      sudo: required
+      dist: trusty
+      services: docker
+      env: TARGET=x86_64-unknown-freebsd DISABLE_TESTS=1
+    - rust: stable
+      sudo: required
+      dist: trusty
+      services: docker
+      env: TARGET=mips-unknown-linux-gnu
+    - rust: stable
+      sudo: required
+      dist: trusty
+      services: docker
+      env: TARGET=armv7-linux-androideabi DISABLE_TESTS=1
+    - rust: stable
+      os: osx
+      sudo: required
+      dist: trusty
+      services: docker
+      env: TARGET=armv7-apple-ios DISABLE_TESTS=1
+    - rust: nightly
+      sudo: required
+      dist: trusty
+      services: docker
+      # Bare metal target; no std; only works on nightly
+      env: TARGET=thumbv6m-none-eabi DISABLE_TESTS=1 DISABLE_STD=1
+
+before_install:
+  - set -e
+  - rustup self update
 
+# Used by all Trust targets; others must override:
+install:
+  - sh utils/ci/install.sh
+  - source ~/.cargo/env || true
 script:
-  - cargo test
-  - cargo test --tests --no-default-features
-  - cargo test --features serde-1,log
-  - cargo test --tests --no-default-features --features=serde-1
+  - bash utils/ci/script.sh
+
+after_script: set +e
+
+cache: cargo
+before_cache:
+  # Travis can't cache files that are not readable by "others"
+  - chmod -R a+r $HOME/.cargo
 
 env:
   global:

src/os.rs

@@ -413,6 +413,7 @@ mod imp {
     use {Error, ErrorKind};
 
     use std::ptr;
+    use std::io;
 
     #[derive(Debug)]
     pub struct OsRng;
@@ -423,10 +424,10 @@ mod imp {
         }
         pub fn try_fill_bytes(&mut self, v: &mut [u8]) -> Result<(), Error> {
             let mib = [libc::CTL_KERN, libc::KERN_ARND];
+            trace!("OsRng: reading {} bytes via kern.arandom", v.len());
             // kern.arandom permits a maximum buffer size of 256 bytes
             for s in v.chunks_mut(256) {
                 let mut s_len = s.len();
-                trace!("OsRng: reading {} bytes via kern.arandom", v.len());
                 let ret = unsafe {
                     libc::sysctl(mib.as_ptr(), mib.len() as libc::c_uint,
                                  s.as_mut_ptr() as *mut _, &mut s_len,

src/prng/xorshift.rs

@@ -135,8 +135,9 @@ mod tests {
         let mut rng1 = XorShiftRng::from_seed(seed);
         assert_eq!(rng1.next_u64(), 4325440999699518727);
 
-        let mut rng2 = XorShiftRng::from_rng(&mut rng1).unwrap();
-        assert_eq!(rng2.next_u64(), 15614385950550801700);
+        let _rng2 = XorShiftRng::from_rng(&mut rng1).unwrap();
+        // Note: we cannot test the state of _rng2 because from_rng does not
+        // fix Endianness. This is allowed in the trait specification.
     }
 
     #[test]

utils/ci/install.sh

@@ -0,0 +1,49 @@
+# From https://github.com/japaric/trust
+
+set -ex
+
+main() {
+    local target=
+    if [ $TRAVIS_OS_NAME = linux ]; then
+        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
+
+    # Builds for iOS are done on OSX, but require the specific target to be
+    # installed.
+    case $TARGET in
+        aarch64-apple-ios)
+            rustup target install aarch64-apple-ios
+            ;;
+        armv7-apple-ios)
+            rustup target install armv7-apple-ios
+            ;;
+        armv7s-apple-ios)
+            rustup target install armv7s-apple-ios
+            ;;
+        i386-apple-ios)
+            rustup target install i386-apple-ios
+            ;;
+        x86_64-apple-ios)
+            rustup target install x86_64-apple-ios
+            ;;
+    esac
+
+    # This fetches latest stable release
+    local tag=$(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 $tag \
+           --target $target
+}
+
+main

utils/ci/script.sh

@@ -0,0 +1,28 @@
+# Derived from https://github.com/japaric/trust
+
+set -ex
+
+main() {
+    if [ ! -z $DISABLE_TESTS ]; then
+        if [ ! -z $DISABLE_STD ]; then
+            cross build --all --no-default-features --target $TARGET --release
+        else
+            cross build --all --features log,serde-1 --target $TARGET
+        fi
+        return
+    fi
+
+    if [ ! -z $NIGHTLY ]; then
+        cross test --all --tests --no-default-features --features alloc --target $TARGET
+        cross test --all --features serde-1,log,nightly --target $TARGET
+        cross test --all --benches --target $TARGET
+    else
+        cross test --all --tests --no-default-features --target $TARGET
+        cross test --all --features serde-1,log --target $TARGET
+    fi
+}
+
+# we don't run the "test phase" when doing deploys
+if [ -z $TRAVIS_TAG ]; then
+    main
+fi