使用 Bazel 离线构建 C++ 项目（无需互联网连接）

Question

我尝试使用此命令从 Bazel 主页（入门）构建 Bazel C++ 构建教程，但没有任何互联网连接：bazel build //main:hello-world

Jenkins 服务器不会与互联网有任何连接，因此我无法进行预取或类似操作。有没有办法在另一台计算机上准备我的 C++ 项目并将依赖项传输到 Jenkins 服务器以离线执行？如何？我只需要从以下错误消息中得到的信息即可运行教程：

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：我尝试预取但不起作用。我做了什么：

1. 跑步bazel fetch //...
2. 将预取的数据从bazel info output_base本地目录复制到 jenkins 服务器（我必须重新创建一个到安装目录的符号链接）。
3. 我bazel build --fetch=false //main:hello-world在詹金斯上运行而无需重新加载。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)

Answer 1

您可以运行bazel fetch //...以在可以访问互联网的计算机上本地获取数据。然后，您只需将预取的数据从bazel info output_base本地 PC 上的目录复制到bazel info output_basejenkins 作业中即可。