hi what doe the

--check

commands do. following the CI tutorial and got the following output when running

./pants tailor --check update-build-files --check

[WARN] No arguments specified with `./pants tailor`, so the goal will do nothing.

Instead, you should provide arguments like this:

  * `./pants tailor ::` to run on everything
  * `./pants tailor dir::` to run on `dir` and subdirs
  * `./pants tailor dir` to run on `dir`
  * `./pants --changed-since=HEAD tailor` to only run on changed and new files
13:28:03.85 [WARN] No arguments specified with `./pants update-build-files`, so the goal will do nothing.

Instead, you should provide arguments like this:

  * `./pants update-build-files ::` to run on everything
  * `./pants update-build-files dir::` to run on `dir` and subdirs
  * `./pants update-build-files dir` to run on `dir`
  * `./pants update-build-files dir/BUILD` to run on that single BUILD file
  * `./pants --changed-since=HEAD update-build-files` to run only on changed BUILD files

I haven't seen that tutorial recently, but it should run in "check-only" mode, so it doesn't try to add/re-write any code

how do I do that

so like this

./pants --changed-since=origin/main tailor ::  --changed-since=origin/main update-build-files  ::

You can chain commands, so following the tutorial: https://www.pantsbuild.org/docs/using-pants-in-ci#approach-1-only-run-over-changed-files

❯ ./pants \
  --changed-since=origin/main \
  tailor --check \
  update-build-files --check \
  lint

That's 1 line, multiple commands

so what i found out is

./pants --changed-since=origin/main tailor \ --changed-since=origin/main update-build-files

can't be run together due to this

You used `--changed-since` at the same time as using directory arguments. You can only use `--changed-since` or use normal arguments.

You only need changed-since once and it applies to both goals.