使用Bazel脱机构建C++项目(没有互联网连接) [英] Build C++ project with Bazel offline (without internet connection)

问题描述

我尝试使用以下命令从Bazel主页(入门)构建Bazel C++构建教程，但没有连接到Internet：bazel build //main:hello-world

Jenkins服务器将不会连接到互联网，因此我无法执行预取或类似操作。有没有办法在另一台计算机上准备我的C++项目，并将依赖项转移到Jenkins服务器以脱机完成？多么?我只需要从下面的错误消息中分别运行该教程：

Extracting Bazel installation...
Starting local Bazel server and connecting to it...
INFO: Repository rules_cc instantiated at:
  /DEFAULT.WORKSPACE.SUFFIX:267:6: in <toplevel>
  C:/users/XXX/_bazel_XXX/dq2p42jq/external/bazel_tools/tools/build_defs/repo/utils.bzl:201:18: in maybe
Repository rule http_archive defined at:
  C:/users/XXX/_bazel_XXX/dq2p42jq/external/bazel_tools/tools/build_defs/repo/http.bzl:336:31: in <toplevel>
WARNING: Download from https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip failed: class java.io.IOException Unable to tunnel through proxy. Proxy returns "HTTP/1.1 501 Not Implemented"
WARNING: Download from https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip failed: class java.io.IOException Unable to tunnel through proxy. Proxy returns "HTTP/1.1 501 Not Implemented"
ERROR: An error occurred during the fetch of repository 'rules_cc':
   Traceback (most recent call last):
        File "C:/users/XXX/_bazel_XXX/dq2p42jq/external/bazel_tools/tools/build_defs/repo/http.bzl", line 111, column 45, in _http_archive_impl
                download_info = ctx.download_and_extract(
Error in download_and_extract: java.io.IOException: Error downloading [https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip, https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip] to C:/users/XXX/_bazel_XXX/dq2p42jq/external/rules_cc/temp1363696983472254851/b1c40e1de81913a3c40e5948f78719c28152486d.zip: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 501 Not Implemented"
ERROR: Error fetching repository: Traceback (most recent call last):
        File "C:/users/XXX/_bazel_XXX/dq2p42jq/external/bazel_tools/tools/build_defs/repo/http.bzl", line 111, column 45, in _http_archive_impl
                download_info = ctx.download_and_extract(
Error in download_and_extract: java.io.IOException: Error downloading [https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip, https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip] to C:/users/XXX/_bazel_XXX/dq2p42jq/external/rules_cc/temp1363696983472254851/b1c40e1de81913a3c40e5948f78719c28152486d.zip: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 501 Not Implemented"
ERROR: Skipping '//main:hello-world': no such package '@rules_cc//cc': java.io.IOException: Error downloading [https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip, https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip] to C:/users/XXX/_bazel_XXX/dq2p42jq/external/rules_cc/temp1363696983472254851/b1c40e1de81913a3c40e5948f78719c28152486d.zip: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 501 Not Implemented"
WARNING: Target pattern parsing failed.
ERROR: no such package '@rules_cc//cc': java.io.IOException: Error downloading [https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip, https://github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip] to C:/users/XXX/_bazel_XXX/dq2p42jq/external/rules_cc/temp1363696983472254851/b1c40e1de81913a3c40e5948f78719c28152486d.zip: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 501 Not Implemented"
INFO: Elapsed time: 30.974s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded)
    currently loading: main

更新： 我试过预取，但不起作用。我所做的：

1. 运行bazel fetch //...
2. 将bazel info output_base目录中的预取数据从本地复制到Jenkins服务器(我必须重新创建一个指向安装目录的sym链接)。
3. 我在Jenkins上运行bazel build --fetch=false //main:hello-world而不重新匹配。现在我收到以下错误：

Loading: 
Loading: 0 packages loaded
WARNING: /DEFAULT.WORKSPACE:1:17: External repository 'bazel_tools' is not up-to-date and fetching is disabled. To update, run the build without the '--nofetch' command line option.
ERROR: error loading package '': Every .bzl file must have a corresponding package, but '@bazel_tools//tools/build_defs/repo:http.bzl' does not have one. Please create a BUILD file in the same or any parent directory. Note that this BUILD file does not need to do anything except exist.
INFO: Elapsed time: 0.298s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded)

推荐答案

我找到了一个使用Bazel离线构建简单C++项目的解决方案。 首先，您必须下载rules_cc和rules_java库，因为这些库是简单的Bazel C++教程项目中的外部依赖库。我没有找到rules_cc的发行版，所以当我尝试使用Bazel Build Offline：https://mirror.bazel.build/github.com/bazelbuild/rules_cc/archive/b1c40e1de81913a3c40e5948f78719c28152486d.zip时，我从控制台上的错误消息中提到的url下载了压缩文件。当您尝试在本地使用带有错误SHA密钥的库时，错误消息中也提到了SHA密钥(见下文)。Rules_Java lib可以在这里下载：https://github.com/bazelbuild/rules_java/releases。这里还提到了WORKSPACE规范。

然后，您必须将以下内容添加到WORKSPACE文件中。请注意，您必须指向rules_cc和rules_java的存档文件的本地副本。对于rules_cc，您必须在strip_prefix中提到归档文件的根路径(.zip文件中的第一个也是唯一一个根目录)。Rules_Java没有根目录：

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "rules_cc",
    urls = ["file:C:/tmp/b1c40e1de81913a3c40e5948f78719c28152486d.zip"],
    strip_prefix = "rules_cc-b1c40e1de81913a3c40e5948f78719c28152486d",
    sha256 = "d0c573b94a6ef20ef6ff20154a23d0efcb409fb0e1ff0979cec318dfe42f0cdd",
)

http_archive(
    name = "rules_java",
    url = "file:C:/tmp/rules_java-4.0.0.tar.gz",
    sha256 = "34b41ec683e67253043ab1a3d1e8b7c61e4e8edefbcad485381328c934d072fe",
)

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