Continuous Integration for curl

Curl runs in many different environments, so every change is run against a large number of test suites.

Every pull request is verified for each of the following:

... it still builds, warning-free, on Linux and macOS, with both clang and gcc
... it still builds fine on Windows with several MSVC versions
... it still builds with cmake on Linux, with gcc and clang
... it follows rudimentary code style rules
... the test suite still runs 100% fine
... the release tarball (the "dist") still works
... it builds fine in-tree as well as out-of-tree
... code coverage does not shrink drastically
... different TLS backends still compile and pass tests

If the pull-request fails one of these tests, it will show up as a red X and you are expected to fix the problem. If you do not understand when the issue is or have other problems to fix the complaint, just ask and other project members will likely be able to help out.

Consider the following table while looking at pull request failures:

CI platform as shown in PR	State	What to look at next
CI / codeql	stable	quality check results
CI / fuzzing	stable	fuzzing results
CI / macos ...	stable	all errors and failures
Code scanning results / CodeQL	stable	quality check results
FreeBSD FreeBSD: ...	stable	all errors and failures
LGTM analysis: Python	stable	new findings
LGTM analysis: C/C++	stable	new findings
buildbot/curl_winssl_ ...	stable	all errors and failures
AppVeyor	flaky	all errors and failures
curl.curl (linux ...)	stable	all errors and failures
curl.curl (windows ...)	flaky	repetitive errors/failures
CodeQL	stable	new findings

Sometimes the tests fail due to a dependency service temporarily being offline or otherwise unavailable, for example package downloads. In this case you can just try to update your pull requests to rerun the tests later as described below.

CI servers

Here are the different CI environments that are currently in use, and how they are configured:

GitHub Actions

GitHub Actions runs the following tests:

Mac OS tests with a variety of different compilation options
Fuzz tests (see the curl-fuzzer repo for more info).
Curl compiled using the Rust TLS backend with Hyper
CodeQL static analysis

These are each configured in different files in .github/workflows.

Azure

The following tests are run in Microsoft Azure CI environment:

Ubuntu tests with a variety of different compilation options.
Windows tests with a variety of different compilation options.

These are all configured in .azure-pipelines.yml.

As of November 2021 @bagder and @mback2k are the only people with administrator access to the Azure CI environment. Additional admins/group members can be added on request.

AppVeyor

AppVeyor runs a variety of different Windows builds, with different compilation options.

As of November 2021 @bagder, @mback2k, @jay, @vszakats, @dfandrich and @danielgustafsson have administrator access to the AppVeyor CI environment. Additional admins/group members can be added on request.

The tests are configured in appveyor.yml.

Zuul

Not used anymore.

Circle CI

Circle CI runs a basic Linux test suite on Ubuntu for both x86 and ARM processors. This is configured in .circleci/config.yml.

You can view the full list of CI jobs on Circle CI's website.

@bagder has access to edit the "Project Settings" on that page. Additional admins/group members can be added on request.

Cirrus CI

Cirrus CI runs a basic test suite on FreeBSD and Windows. This is configured in .cirrus.yml.

You can view the full list of CI jobs on Cirrus CI's website.