Michael Goulet
6963d74cd1
Reduce the noise of bootstrap changelog warnings in --dry-run mode Presently x.py displays "There have been changes to x.py since you last updated:" note only once when run normally, but on every invocation when run with `--dry-run`. The disparity is not exactly intentonal, but just a historical accident. It was made to be printed once in https://github.com/rust-lang/rust/pull/117815 via storing `.last-warned-change-id` on disk in `{config.out}/bootstrap` (i.e. `build/bootstrap`) directory. But that didn't quite work for `--dry-run`, since `{config.out}/bootsrap` points to `build/tmp-dry-run/bootstrap` which *isn't* created in dry-run mode, so file creation fails. This got fixed in https://github.com/rust-lang/rust/pull/118789 and now `--dry-run` does not save `.last-warned-change-id` at all. (Nor does it read it, since it cannot know to read from non-dry-run location) This PR simply stops displaying the changelog altogether in --dry-run mode. <details> <summary>previous attempt (outdated)</summary> This PR takes a different approach, and instead of not-writing the stamp in `--dry-run` mode it instead tries harder to yes-write it, and, specifically, creates `build/tmp-dry-run/bootstrap` directory to do so. If neccessary (i.e. if there are changes newer than the `change-id` stamp of config.toml to warn about). Note that `build/tmp-dry-run/` was *already* being created, so making an extra `boostrap` sub-folder should not meaningfully pollute the build dir. </details> (Apologies for the, perhaps, excessively wordy PR, I'm new to this)
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