c++ - 在 Travis-CI 上使用 Conan 和 Python3

Question

我有一个使用 Travis-CI 和 Conan 的 C++ 项目。我在 Travis-CI 上构建的 Linux 在尝试下载 libcurl 时失败了:

libcurl/7.61.1@bincrafters/stable: Building your package in /home/travis/.conan/data/libcurl/7.61.1/bincrafters/stable/build/b6dbf799dd7e6d1c740e159bea361666320a3db8
libcurl/7.61.1@bincrafters/stable: Configuring sources in /home/travis/.conan/data/libcurl/7.61.1/bincrafters/stable/source
/usr/local/lib/python2.7/dist-packages/urllib3/util/ssl_.py:150: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecurePlatformWarning
ERROR: Error downloading file https://curl.haxx.se/download/curl-7.61.1.tar.gz: 'HTTPSConnectionPool(host='curl.haxx.se', port=443): Max retries exceeded with url: /download/curl-7.61.1.tar.gz (Caused by SSLError(CertificateError("hostname 'curl.haxx.se' doesn't match 'c.sni.fastly.net'",),))'
Waiting 5 seconds to retry...
/usr/local/lib/python2.7/dist-packages/urllib3/util/ssl_.py:150: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecurePlatformWarning
libcurl/7.61.1@bincrafters/stable: WARN: Trying to remove corrupted source folder
libcurl/7.61.1@bincrafters/stable: WARN: This can take a while for big packages
ERROR: libcurl/7.61.1@bincrafters/stable: Error in source() method, line 131
    tools.get("https://curl.haxx.se/download/curl-%s.tar.gz" % self.version)
    ConanException: Error downloading file https://curl.haxx.se/download/curl-7.61.1.tar.gz: 'HTTPSConnectionPool(host='curl.haxx.se', port=443): Max retries exceeded with url: /download/curl-7.61.1.tar.gz (Caused by SSLError(CertificateError("hostname 'curl.haxx.se' doesn't match 'c.sni.fastly.net'",),))'
The command "conan install .. --build missing" exited with 1.

根据错误中的建议，我尝试让 Travis 使用 Python3 来查看是否可以解决问题，但我没有成功。首先，我将 python3 添加到我的 packages: 中，如下所示:

matrix:
  include:
    - os: linux
      dist: trusty
      sudo: required
      env:
        - CC_COMPILER=gcc-7
        - CXX_COMPILER=g++-7
        - BUILD_TYPE=RelWithDebInfo
      addons:
        apt:
          packages:
            - python3
            - gcc-7
            - g++-7
          sources:
            - ubuntu-toolchain-r-test

但是我收到了和上面一样的错误。然后我尝试使用 alias 命令:

install:
  - |
    if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
      sudo pip install conan
      alias python=python3
    fi

然而，我得到了相同的结果。

如何让 Travis-CI 为 Conan 使用 python3？还是有其他方法可以让我的 conan install 命令正常工作？

谢谢!

Answer 1

使用 conan new pkg/version -s -cilg 生成的默认 CI 脚本可能会有所帮助。它们包含如下内容:

linux: &linux
   os: linux
   dist: xenial
   sudo: required
   language: python
   python: "3.6"
   services:
     - docker

matrix:
   include:
      - <<: *linux
        env: ...

install:
  - chmod +x .travis/install.sh
  - ./.travis/install.sh

安装脚本:

pip install conan --upgrade
pip install conan_package_tools

conan user

所以它没有声明为包，而是在根级别定义，这似乎足以在以后通过裸pip install使用它。