Running go tools in bazel

[Jonathan Barrios]

I have a tool go swagger which I need to run is there a way to do this in bazel. The main issue is that it needs all the information necessary to compile the code. I am using the external method and there for my build is go build incompatible.

[Tom Wilkie]

Hi Jonathan

You could use a genrule:  https://docs.bazel.build/versions/master/be/general.html#genrule

We use something similar to build our UI code, although I doubt yours will need to be anyway near as complicated - we had to work around various problems with symlinks and npm.

Cheers

Tom

genrule(

    name = "build",

    srcs = glob([

        "src/**/*",

        "public/*",

    ]) + [

      "node_modules.tgz",

      "package.json",

      ".eslintrc",

    ],

    outs = ["ui.tar"],

    cmd =

      # First cp everything into a tempdir to get around symlink problems.

      "mkdir tmp && cp -LR $$(dirname $(location :package.json))/* tmp/ && " +

      # Then extract the tarball of node_modules into the tmp dir.

      "tar zxf $(location node_modules.tgz) -C tmp/ && " +

      # Finally build the UI.

      "cd tmp && npm run build && " +

      # And tar up the resulting built assets.

      "tar -cf - -C ./build/ . >../$@", # --mtime='1970-01-01'

    visibility = ["//visibility:public"],

)

On Mon, Nov 6, 2017 at 8:05 PM Jonathan Barrios <jonathan...@gmail.com> wrote:

I have a tool go swagger which I need to run is there a way to do this in bazel. The main issue is that it needs all the information necessary to compile the code. I am using the external method and there for my build is go build incompatible.

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[Jay Conrod]

Seems like this is a code generating tool. To run it with Bazel, you'll want to run it with a genrule or define a new Skylark rule for it.

If your sources are already laid out in the format that tool expects, you should just be able to add the sources in a srcs or data attribute as Tom suggested. Note that glob won't cross Bazel package boundaries, so if you need all sources from all packages, you may want to define a filegroup in each package with the sources. Each filegroup can include the filegroup from child packages.

If you need your sources in a GOPATH layout (sounds like this might be the case since you're using external repositories), you can try the experimental go_path rule. See path.bzl. You can load this from @io_bazel_rules_go//go:def.bzl.

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[Jonathan Barrios]

How is go_path supposed to be used? I will need this tool because I use external repos

[Jay Conrod]

See BUILD.bazel for an example of how we're using it in rules_go. Basically, you give it a list of deps; they can be go_library, go_binary, go_test, or anything compatible. The rule will produce a GOPATH-like directory tree.

This rule is experimental, and we may change it in the future, but we'll provide a reasonable alternative for tools like this.

On Wed, Nov 8, 2017 at 2:53 PM, Jonathan Barrios <jonathan...@gmail.com> wrote:

How is go_path supposed to be used? I will need this tool because I use external repos

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[Guy BL]

Jonathan, 

Were you able to figure how to use go_path ? I am wondering what was your eventual solution.

Best,

Guy

On Wednesday, November 8, 2017 at 2:13:47 PM UTC-5 jayc...@google.com wrote:

See BUILD.bazel for an example of how we're using it in rules_go. Basically, you give it a list of deps; they can be go_library, go_binary, go_test, or anything compatible. The rule will produce a GOPATH-like directory tree.

This rule is experimental, and we may change it in the future, but we'll provide a reasonable alternative for tools like this.

On Wed, Nov 8, 2017 at 2:53 PM, Jonathan Barrios <jonathan...@gmail.com> wrote:

How is go_path supposed to be used? I will need this tool because I use external repos

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