libc-rs/ci

The goal of the libc crate is to have CI running everywhere to have the strongest guarantees about the definitions that this library contains, and as a result the CI is pretty complicated and also pretty large! Hopefully this can serve as a guide through the sea of scripts in this directory and elsewhere in this project.

Files

First up, let's talk about the files in this directory:

• Dockerfile-android, android-accept-licenses.sh -- these two files are used to build the Docker image that the android CI builder uses. The Dockerfile just installs the Android SDK, NDK, a Rust nightly, Rust target libraries for Android, and sets up an emulator to run tests in. You can build a new image with this command (from the root of the project):

  docker build -t alexcrichton/rust-libc-test -f ci/Dockerfile-android .
  

  When building a new image contact @alexcrichton to push it to the docker hub and have libc start using it. This hasn't needed to happen yet, so the process may be a little involved.

  The script here, android-accept-licenses.sh is just a helper used to accept the licenses of the SDK of Android while the docker image is being created.

• msys2.ps1 - a PowerShell script which is used to install MSYS2 on the AppVeyor bots. As of this writing MSYS2 isn't installed by default, and this script will install the right version/arch of msys2 in preparation of using the contained C compiler to compile C shims.

• run-travis.sh - a shell script run by all Travis builders, this is responsible for setting up the rest of the environment such as installing new packages, downloading Rust target libraries, etc.

• run.sh - the actual script which runs tests for a particular architecture. Called from the run-travis.sh script this will run all tests for the target specified.

• cargo-config - Cargo configuration of linkers to use copied into place by the run-travis.sh script before builds are run.

• dox.sh - script called from run-travis.sh on only the linux 64-bit nightly Travis bots to build documentation for this crate.

• landing-page-*.html - used by dox.sh to generate a landing page for all architectures' documentation.

CI Systems

Currently this repository leverages a combination of Travis CI and AppVeyor for running tests. The triples tested are:

• AppVeyor
  • {i686,x86_64}-pc-windows-{msvc,gnu}
• Travis
  • {i686,x86_64,mips,aarch64}-unknown-linux-gnu
  • x86_64-unknown-linux-musl
  • arm-unknown-linux-gnueabihf
  • arm-linux-androideabi
  • {i686,x86_64}-apple-{darwin,ios}

The Windows triples are all pretty standard, they just set up their environment then run tests, no need for downloading any extra target libs (we just download the right installer). The Intel Linux/OSX builds are similar in that we just download the right target libs and run tests. Note that the Intel Linux/OSX builds are run on stable/beta/nightly, but are the only ones that do so.

The remaining architectures look like:

• Android runs in a docker image with an emulator, the NDK, and the SDK already set up (see Dockerfile-android). The entire build happens within the docker image.
• The MIPS, ARM, and AArch64 builds all use QEMU to run the generated binary to actually verify the tests pass.
• The MUSL build just has to download a MUSL compiler and target libraries and then otherwise runs tests normally.
• iOS builds need an extra linker flag currently, but beyond that they're built as standard as everything else.

Hopefully that's at least somewhat of an introduction to everything going on here, and feel free to ping @alexcrichton with questions!