如何将变量传递给Bazel目标构建? [英] How to pass variables to Bazel target build?

问题描述

我正在尝试使用以下代码构建Docker映像:

I am trying to build a Docker image with this code:

container_image(
    name = "docker_image",
    base = "@java_base//image",
    files = [":executable_deploy.jar"],
    cmd = ["java", "-jar", "executable_deploy.jar"],
    env = { "VERSION" : "$(VERSION)" }
)

我想将变量传递给构建的目标，以便可以在$(VERSION)中将其替换.这可能吗?

I want to pass a variable to the target built so it can be replaced in $(VERSION). Is this possible?

我尝试使用VERSION=1.0.0 bazel build :docker_image，但出现错误:

I have tried with VERSION=1.0.0 bazel build :docker_image, but I get an error:

未定义$(VERSION).

$(VERSION) not defined.

如何传递该变量?

根据文档:

此字段(env)的值支持make变量(例如$(FOO))和 邮票变量;键支持也使变量. 但是我不明白那是什么意思.

The values of this field (env) support make variables (e.g., $(FOO)) and stamp variables; keys support make variables as well. But I don't understand exactly what that means.

推荐答案

这些变量可以通过

Those variables can be set via the --define flag.

rules_docker页面上有关于标记的部分，涵盖了这一点.

There is a section on the rules_docker page about stamping which covers this.

基本上，您可以执行以下操作: bazel build --define=VERSION=1.0.0 //:docker_image

Essentially you can do something like: bazel build --define=VERSION=1.0.0 //:docker_image

还可以从stable-status.txt和volatile-status.txt文件中获取这些键/值对. bazel的用户手册页显示了如何使用这些文件，并使用 --workspace_status_command 填充它们.

It is also possible to source these key / value pairs from the stable-status.txt and volatile-status.txt files. The user manual page for bazel shows how to use these files, and the use of the --workspace_status_command to populate them.

要设置默认值，您可以使用 .bazelrc 文件，内容如下:

For setting defaults, you could use a .bazelrc file, with something like the following as the contents:

build --define=VERSION=0.0.0-PLACEHOLDER

在命令行中传递的标志将优先于.bazelrc文件中的标志.

The flags passed on the command line will take precedence over those in the .bazelrc file.

值得一提的是，更改define值将使bazel再次分析所有内容，这取决于图表，可能需要一些时间，但只会执行受影响的操作.

It's worth mentioning, that changing define values will cause bazel to analyze everything again, which depending on the graph may take some time, but only affected actions will be executed.

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