How to get bzlmod version info embedded at build time?

[Jelle Schuhmacher]

Hi folks,

I'm trying to embed some version information of third party modules into a generated file, "Version.cpp.inc", and so far without success.

I have a .bazelrc with --workspace_status_command "utils/workspace_status.sh" that outputs the required STABLE_XXX lines to the stable-status.txt file, and a corresponding genrule that embeds those into the required include file. 

This setup works fine until I try to add module version information into the mix. When I add:

bazel mod --output=json --depth=1 path "my_top_level_module" | jq ...<snip>... 

into the workspace_status_command script, the build hangs. It turns out bazel mod cannot be used inside a workspace status command, it hangs with:

Another command (pid=68387) is running. Waiting for it to complete on the server (server_pid=61337)...

Are there better ways to get to the module version information so that it can be embedded in the generated file? Would it perhaps somehow be accessible with a genquery instead? 

Cheers,

Jelle

For info, I'm trying to get to this field somehow:

{
  "key": "onnx...@20250219.1035",
  "name": "onnx-mlir",
  "version": "20250219.1035",
  "apparentName": "onnx-mlir",

  ... <snip> ...

[Xudong Yang]

in a .bzl file loaded from a BUILD file, you can use `native.module_version()` (https://bazel.build/rules/lib/toplevel/native#module_version) to get the version of the module the BUILD file is in.

"  YÁNG Xùdōng (杨旭东)

#  SURNAME Givenname

=  Software Engineer

@  Google New York

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