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Questions tagged [skylark]

a dialect of Python intended for use as a configuration language. Developed for the Bazel build tool and also used in Buck. It has been renamed Starlark.

16 questions
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Bazel: genrule that outputs a directory

I'm just getting started working with Bazel. So, I apologize in advance that I haven't been able to figure this out. I'm trying to run a command that outputs a bunch of files to a directory and make this directory available for subsequent targets. I…
Skylar Saveland
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How to create a directory structure in bazel

I want to create the following structure in bazel. dir1 |_ file1 |_ file2 |_ dir2 |_file3 Creating a specific structure doesn't seem trivial. I'm hoping there's a simple and reusable rule. Something like: makedir( name =…
GGhe
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How to properly load a Starlark script into another?

I'm trying to make a very simple implementation with Starlark: greeting.bzl def greet(): print ("Hello World!") test.bzl load (":greeting.bzl", "greet") greet() And execute it with: java -jar Starlark_deploy.jar test.bzl The result of the…
Humble Student
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Instantiating a Bazel macro twice with same generated output file

Suppose I have a Bazel macro that is using a generator rule to generate an output file given an input file: def my_generator( name, input_file, output_file, **kwargs): args = [] args.extend(["--arg1",…
roschach
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1 answer

Skylark struct with methods

Here's something I tried to do, and it works well. I find it useful, but it feels like a hack, so I'm afraid it will break in the future. I'm working on converting a large project to Bazel, and we have lots of local wrappers, something…
ugoren
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How do I include a Skylark configuration parser in my application?

I like the idea of configuring my Java application with restricted Python code. This restrained Python configuration language goes by the name of Skylark. I found a Go library for Skylark support, but I need a Java one. Which maven artifact from the…
user7610
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Bazel get full path of bazel-out/workspace in Skylark

I want to integrate checkstyle with bazel following this SO thread: What is the best way to invoke Checkstyle from within Bazel? which works perfectly as long as I provide the full harcoded path when building the classpath checkstyle.bzl for file in…
KeykoYume
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2 answers

How do I get workspace status in bazel

I would like to version build artefacts with build number for CI passed to bazel via workspace_status_command. Sometimes I would like to include build number to the name of the artefact. Is there a way how do I access ctx when writing a macro(as I…
jaksky
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Toolchain not downloading the tool

Hi I'm trying to set up a toolchain for the Fn project. The approach is to set up a toolchain per binary available in GitHub and then, in theory use it in a rule. I have a common package which has the available binaries: default_version =…
mrk
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Using bazel macros across repositories with labels

I've got two repositories, Client and Library. Inside of Client's WORKSPACE file Client imports Library as a http_archive with the name "foo". Inside of Client, I want to use Library macros that reference targets inside Library. My problem is that…
razeh
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Python program run using bazel skylark rule is not running properly

I have custom rule to invoke py_binary. When I do Bazel Build //Cutom_rule --platform=//platform/stm32f4 the python program invoked is not able to run the subprocesses_run() that runs command(STLink_cli.exe -list) within python program. I think the…
Hema
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How to get list diff in Skylark?

I'd like to do something like: srcs = glob(["*.proto"]) - ["some.proto"], That particular syntax isn't valid in Skylark. How do I go about accomplishing a list diff in Skylark?
Noel Yap
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How can I pass an alias value to a bazel function?

I have the following alias defined in a BUILD file: alias( name = "platform", actual = select({ ":macos_x86_64": "macos_x86_64", ":linux_x86_64": "linux_x86_64", ":linux_aarch64": "linux_aarch64", }), …
qwerty
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How to pass test args in Skylark Bazel?

I'm writing some bazel tests where I need to be able to provide the full path to some file. bazel test //webservice:checkstyle-test --test_arg="path_to_some_file" My question is how can you parse the input arguments in your bazel test? Is there…
KeykoYume
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Bazel sorts keys of attr.label_keyed_string_dict implicity

I'm currently running Bazel 0.9.0. I've defined a custom Bazel rule. In one of the fields, I'm using a attr.label_keyed_string_dict. While processing the keys during evaluation phase, the keys are being sorted implicitly. Is there any flag/option to…
Basava Raj
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