Cherry-pick #7713 to 6.x: Simplify fields.yml generator #7778
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This PR simplifies the process of generating a new `fields.yml` file for a Beat. * `libbeat/fields.yml` is not a dependency anymore * only `fields.yml` is written to disk Changes in the asset files are due to different number of newlines in generated `fields.yml` files. ### Interface changes of generator tools Both `dev-tools/cmd/asset/asset.go` and `libbeat/scripts/cmd/global_fields/main.go` is changed. The first one has two new flags: `-in`, and `-out`. By default it reads from stdin and writes to stdout. Using the flags it's possible to read and write from other files. The second one has one new flag `-out` which specifies the output file. If it's not set, the output is written to stdout. This makes it possible to generate asset files for Metricbeat without writing `libbeat/fields.yml` to disk. It will be useful in the future when more Beats have modular assets. Closes elastic#7671 (cherry picked from commit 5797005)
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Cherry-pick of PR #7713 to 6.x branch. Original message:
This PR simplifies the process of generating a new
fields.ymlfile for a Beat.libbeat/fields.ymlis not a dependency anymorefields.ymlis written to diskChanges in the asset files are due to different number of newlines in generated
fields.ymlfiles.Interface changes of generator tools
Both
dev-tools/cmd/asset/asset.goandlibbeat/scripts/cmd/global_fields/main.gois changed. The first one has two new flags:-in, and-out. By default it reads from stdin and writes to stdout. Using the flags it's possible to read and write from other files. The second one has one new flag-outwhich specifies the output file. If it's not set, the output is written to stdout.This makes it possible to generate asset files for Metricbeat without writing
libbeat/fields.ymlto disk. It will be useful in the future when more Beats have modular assets.Closes #7671