tree 1a8bfc640bf2dcdde4579b027a89959f9195d660
parent 938e34823206a2644d538ba655d20ac553352975
author Chi Wang <chiwang@google.com> 1677608001 +0100
committer GitHub <noreply@github.com> 1677608001 +0000
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Report background download for BwoB (#17619)

When building without the bytes, downloads can happen when Bazel need to fetch inputs for local actions, download outputs of toplevel targets, and etc. The downloads happen silently at the background.

This PR makes output downloads of toplevel targets visible to the UI.

For downloads during the build, the UI looks like:

```
[2 / 5] 2 actions, 1 running
    [Prepa] Executing genrule //:foo
    Executing genrule //:bar; 2s
    Fetching bazel-out/darwin-fastbuild/bin/baz; 50.8 MiB / 1.0 GiB; 4s
```

For downloads after build is completed, the UI looks like:

```
INFO: 2 processes: 1 remote cache hit, 1 internal.
INFO: Build completed successfully, 2 total actions
    Fetching bazel-out/darwin-fastbuild/bin/baz; 48.8 MiB / 1.0 GiB
```

Fixes https://github.com/bazelbuild/bazel/issues/17417.

Closes #17604.

PiperOrigin-RevId: 512934756
Change-Id: I502489420ab9b84efb74ceabbe3dd4cb4a7a62e2