Creating a binary target from a downloaded binary?

[Kamal Marhubi]

Is there a way to make a binary target out of a binary blob? Here are the options I've come up with:
- use a genrule(executable = 1, cmd = "cp $< $@") to rename it and make it an executable according to Bazel
- use a genrule to rename it to .sh, and use that as srcs for an sh_binary rule

The file is coming from a .tgz that contains just a single executable, so http_file(executble = 1) isn't quite applicable as it needs extraction. This results in me making it a new_http_archive and using one of the tricks above.

I'm sure there's a better way to do this, but I think I'm missing it.

Thanks,

-Kamal

[Kristina Chodorow]

I think either of those sound fine, the first one sounds a little more straightforward.  

There isn't a built-in way to chmod an input.  I guess if you needed to do it a lot you could make a skylark macro for it.

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[Brian Silverman]

Does the file actually need to be chmod'ed? If it's from a .tgz, it probably already has the correct permissions. In that case, a filegroup or exports_files would be simpler.

AFAIK Bazel doesn't keep track of whether files are executable or not; those executable attributes for genrule and http_file basically just force a chmod.

Also, the skylark macro is going to be hard until #429 is fixed.

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[Kamal Marhubi]

On Mon, Nov 30, 2015 at 3:15 PM Brian Silverman <bsilve...@gmail.com> wrote:

Does the file actually need to be chmod'ed? If it's from a .tgz, it probably already has the correct permissions. In that case, a filegroup or exports_files would be simpler.

AFAIK Bazel doesn't keep track of whether files are executable or not; those executable attributes for genrule and http_file basically just force a chmod.

It's got executable permission, but bazel run won't work, complaining that it's not executable. This seems to get checked by the run command:

https://github.com/bazelbuild/bazel/blob/9e091ddef4dbbd97a2bff75948c474fe4127e541/src/main/java/com/google/devtools/build/lib/runtime/commands/RunCommand.java#L497-L500

Anyway, for my current use case of coyping it into a docker_build, exports_files will work fine so thanks for the tip! I haven't checked if I'd be able to execute it in a genrule or in a Skylark rule.

-Kamal