The great Travis speedup

.travis.yml

@@ -1,35 +1,51 @@
 sudo: false
 dist: trusty
+
 language: rust
 cache: cargo
-rust:
-  - stable
-  - nightly-2018-01-20
 
 env:
   global:
-    # Versions known to work with pinned nightly.
-    - CLIPPY_VERSION=0.0.180
-    - RUSTFMT_VERSION=0.3.6
-
-before_script:
-  - export PATH=$HOME/.cargo/bin:$PATH
-  - |
-    if ! type -p cargo-install-update; then
-        cargo install --force cargo-update
-    else
-        cargo install-update -i cargo-update
-    fi
-  - |
-    if [[  $TRAVIS_RUST_VERSION =~ nightly-* ]]; then
-        cargo install-update -i "clippy:$CLIPPY_VERSION"
-        cargo install-update -i "rustfmt-nightly:$RUSTFMT_VERSION"
-    fi
-script:
-  - |
-    RUSTFLAGS=-Dwarnings cargo build &&
-    cargo test
-  - |
-    [[ ! $TRAVIS_RUST_VERSION =~ nightly-* ]] || RUSTFLAGS=-Dwarnings cargo fmt -- --write-mode diff
-  - |
-    [[ ! $TRAVIS_RUST_VERSION =~ nightly-* ]] || RUSTFLAGS=-Dwarnings cargo clippy
+    - RUSTFLAGS=-Dwarnings
+
+    # Versions known to work with pinned nightly for lints.
+    - CLIPPY_VERSION=0.0.187
+
+matrix:
+  include:
+    # Tests on all the channels
+    - env: TASK=test
+      rust: stable
+    - env: TASK=test
+      rust: beta
+    - env: TASK=test
+      rust: nightly
+
+    # Execute lints with the pinned nightly we know works.
+    - env: TASK=lint
+      rust: nightly-2018-03-07
+
+  # Don't block CI if a nightly is faulty
+  fast_finish: true
+  allow_failures:
+    - rust: nightly
+
+before_script: |
+  if [[ $TASK = "lint" ]]; then
+      if ! type -p cargo-install-update; then
+          cargo install --force cargo-update
+      else
+          cargo install-update -i cargo-update
+      fi
+
+      rustup component add rustfmt-preview
+      cargo install-update -i "clippy:$CLIPPY_VERSION"
+  fi
+
+script: |
+  if [[ $TASK = "lint" ]]; then
+      cargo fmt -- --write-mode diff
+      cargo clippy
+  elif [[ $TASK = "test" ]]; then
+      cargo build && cargo test
+  fi

src/cli.rs

@@ -70,7 +70,8 @@ pub enum Crater {
         env: DockerEnv,
     },
 
-    #[structopt(name = "create-lists", about = "create all the lists of crates")] CreateLists,
+    #[structopt(name = "create-lists", about = "create all the lists of crates")]
+    CreateLists,
 
     #[structopt(name = "define-ex", about = "define an experiment")]
     DefineEx {
@@ -107,10 +108,7 @@ pub enum Crater {
     },
 
     #[structopt(name = "copy-ex", about = "copy all data from one experiment to another")]
-    CopyEx {
-        ex1: Ex,
-        ex2: Ex,
-    },
+    CopyEx { ex1: Ex, ex2: Ex },
 
     #[structopt(name = "delete-ex", about = "delete shared data for experiment")]
     DeleteEx {
@@ -174,7 +172,8 @@ pub enum Crater {
         s3_prefix: Option<report::S3Prefix>,
     },
 
-    #[structopt(name = "serve-report", about = "serve report")] Serve,
+    #[structopt(name = "serve-report", about = "serve report")]
+    Serve,
 }
 
 impl Crater {

src/docker.rs

@@ -104,8 +104,8 @@ pub fn rust_container(config: RustEnv) -> ContainerConfig {
 
     ContainerConfig {
         image_name: IMAGE_NAME,
-        mounts: mounts,
-        env: env,
+        mounts,
+        env,
     }
 }
 

src/ex.rs

@@ -136,9 +136,9 @@ pub fn define_(ex_name: &str, tcs: Vec<Toolchain>, crates: Vec<Crate>, mode: ExM
     );
     let ex = Experiment {
         name: ex_name.to_string(),
-        crates: crates,
+        crates,
         toolchains: tcs,
-        mode: mode,
+        mode,
     };
     fs::create_dir_all(&ex_dir(&ex.name))?;
     let json = serde_json::to_string(&ex)?;

src/report/mod.rs

@@ -63,7 +63,7 @@ pub fn generate_report(config: &Config, ex: &ex::Experiment) -> Result<TestResul
                 let rel_log = writer.result_path_fragement();
 
                 Ok(BuildTestResult {
-                    res: res,
+                    res,
                     log: format!("{}", rel_log.display()),
                 })
             });

src/run.rs

@@ -212,9 +212,9 @@ fn log_command(mut cmd: Command, capture: bool, quiet: bool) -> Result<ProcessOu
     }))?;
 
     Ok(ProcessOutput {
-        status: status,
-        stdout: stdout,
-        stderr: stderr,
+        status,
+        stdout,
+        stderr,
     })
 }