build tag to exclude mainnet genesis from prysmctl

[kasey]

What type of PR is this?

Feature

What does this PR do? Why is it needed?

This is one small step to reducing the binary size of prysmctl. We'll get much bigger benefits from excluding validator web ui data, but since those are generated files it will take some more work to figure out how to accomplish that through bazel.

[prestonvanloon]

Tested this locally

Before: 65334646 bytes
After: 65336792 bytes

Appears to be larger somehow. Did it work for you with bazel?

[kasey]

@prestonvanloon

Tested this locally

Before: 65334646 bytes After: 65336792 bytes

Appears to be larger somehow. Did it work for you with bazel?

[kasey@poblano prysm]$ grep noMainnet cmd/prysmctl/BUILD.bazel 
    #gotags = ["noMainnetGenesis"],
[kasey@poblano prysm]$ bazel build //cmd/prysmctl
DEBUG: /opt/bazel/_bazel_kasey/e28cd52451c4ead1ba09bfd91293b70f/external/io_bazel_rules_go/extras/embed_data.bzl:43:10: Embedding is now better handled by using rules_go's built-in embedding functionality (https://github.com/bazelbuild/rules_go/blob/master/docs/go/core/rules.md#go_library-embedsrcs). The `go_embed_data` rule is deprecated and will be removed in rules_go version 0.39.
INFO: Analyzed target //cmd/prysmctl:prysmctl (926 packages loaded, 19133 targets configured).
INFO: Found 1 target...
Target //cmd/prysmctl:prysmctl up-to-date:
  bazel-bin/cmd/prysmctl/prysmctl_/prysmctl
INFO: Elapsed time: 7.211s, Critical Path: 2.46s
INFO: 3 processes: 1 internal, 2 linux-sandbox.
INFO: Build completed successfully, 3 total actions
[kasey@poblano prysm]$ ls -al bazel-bin/cmd/prysmctl/prysmctl_/prysmctl
-r-xr-xr-x 1 kasey kasey 67144200 Apr  6 10:15 bazel-bin/cmd/prysmctl/prysmctl_/prysmctl
[kasey@poblano prysm]$ grep noMainnet cmd/prysmctl/BUILD.bazel 
    gotags = ["noMainnetGenesis"],
[kasey@poblano prysm]$ bazel build //cmd/prysmctl
DEBUG: /opt/bazel/_bazel_kasey/e28cd52451c4ead1ba09bfd91293b70f/external/io_bazel_rules_go/extras/embed_data.bzl:43:10: Embedding is now better handled by using rules_go's built-in embedding functionality (https://github.com/bazelbuild/rules_go/blob/master/docs/go/core/rules.md#go_library-embedsrcs). The `go_embed_data` rule is deprecated and will be removed in rules_go version 0.39.
INFO: Analyzed target //cmd/prysmctl:prysmctl (1 packages loaded, 5073 targets configured).
INFO: Found 1 target...
Target //cmd/prysmctl:prysmctl up-to-date:
  bazel-bin/cmd/prysmctl/prysmctl_/prysmctl
INFO: Elapsed time: 3.834s, Critical Path: 2.22s
INFO: 3 processes: 1 internal, 2 linux-sandbox.
INFO: Build completed successfully, 3 total actions
[kasey@poblano prysm]$ ls -al bazel-bin/cmd/prysmctl/prysmctl_/prysmctl
-r-xr-xr-x 1 kasey kasey 65336099 Apr  6 10:16 bazel-bin/cmd/prysmctl/prysmctl_/prysmct

[prestonvanloon]

Not sure what my issues were locally. I believe that your changes would work. Looks good to me