Bazel Question: `filegroup` to `declare_directory`

[Yanjun Zhu]

Hi team,

I posted the question to YAQS https://yaqs.corp.google.com/eng/q/5400022661403246592. 

I want to know is there any graceful way to do this transition?

Thanks!

[Derek Perez]

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[Yanjun Zhu]

ooops...I'm sorry...let me copy and paste the question here:

 I have a general question about how to make filegroup into a declare_directory.
So what I can think about is like,  filegroup -> pkg_tar -> untar_to_dir(A rule to untar the tarball into the declare_directory)

 

It would work, and I already proved it. However, I want to know whether any other more graceful method to avoid tar and untar the filegroup?

 

One idea I tried, but much complicated, is to copy them into the declare_directory file by file. But the tricky point is, it could not gracefully deal with keeping the same dir structure in the new dir. (like I have to mkdir a lot of sub-directory before cp)
Thanks!

[Alex Eagle]

You can just use `cp` instead of `tar`, like this rule does https://github.com/aspect-build/bazel-lib/blob/main/docs/copy_to_directory.md

it takes sources which can include filegroup, and outputs a TreeArtifact (ctx.actions_declare_directory)

[Yanjun Zhu]

nice! Thanks for sharing. Actually I finally tried this way, and it worked.

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