Hooks for generating BUILD files?

[ms...@dropbox.com]

Hi Bazelites,

I was wondering if there is any way to hook in a BUILD file generator or dynamic rule-writer to bazel itself.

I currently generate the dependencies of Python and Go with small tools that emits BUILD files. Naturally this could be done in some sort of wrapper script, but I wondered if there is a better way to do with inside Bazel/Skylark itself.

I thought I had heard of some plan to implement such a thing, but I haven't seen any documentation that proves it wasn't all a dream I had.

Thanks,

-Mike

[Damien Martin-guillerez]

You meant like the mechanisms described by this document: https://docs.google.com/document/d/1dykHtT5oOrq6dOb6BsqsqhKqNIztXRYhpyuYYMke-6Q/

It was abandoned in favor of https://docs.google.com/document/d/1jKbNXOVp2T1zJD_iRnVr8k5D0xZKgO8blMVDlXOksJg/

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[actionspe...@gmail.com]

Hi - I'm sorry, I don't have an answer for you. But I'm looking at the possibility of introducing bazel at work and was considering doing something like you describe for our python and javascript dependencies. Would you mind sharing a little more of the solution you've been working with? Is it consuming a requirements.txt file (for pip installed python deps?)

Sorry to barge on, feel free to ignore.

Anthony

[Han-Wen Nienhuys]

I don't think there is a plan. Inside google, there are language
specific tools which generate/update BUILD files for certain
languages.

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Han-Wen Nienhuys
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[Mike Solomon]

I should have been more clear. At Google, if you want to build some Go code, you used to a run "glaze" to emit a series of generated BUILD files.  I have basically written "gazel" and the missing piece is that during development, it's inconvenient to re-run glaze/gazel by hand and makes the workflow more cumbersome for Go folks who are used to the open source workflow.

Writing a tiny wrapper program to Blaze isn't my first choice, but if the rest of the team feels strongly, it feels like that's my only option at this point.

[Han-Wen Nienhuys]

Inside google, it's hooked into the editors' save function. You could try that.

[Mike Solomon]

I have a series of skylark rules the encapsulate relocatable python modules. This basically takes python code/shared libraries and creates a zip file that is treated as an intermediate file. When a binary or test target is compiled, these intermediate zip files are exploded into runfiles in a special location. A couple of helper binaries take care of pulling and verifying pip code and statically linking C/C++ dependencies.

It's important to note that the rules that ship with Bazel for python are not hermetic and not particularly useful. There is a good bit of non-trivial work to get it functioning, but it's really starting to pay dividends.

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