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Simplify setting default cops #157

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merged 6 commits into from
Oct 31, 2023
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dafyddcrosby
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Description

I noticed a bunch of stale cop names in chefstyle.yml, and saw how manually intensive and error-prone the process is to update RuboCop in chefstyle. Several of the cops were renamed and chefstyle stopped checking for them - the current vendoring process didn't stop that. In https://github.com/facebook/chef-cookbooks we also take an allowlist-style approach to RuboCop lints, but use DisableByDefault to accomplish that. There's prior art here: #66 took a stab at this, but there were other changes mixed in besides that transition, and it doesn't look like there was a parity test of the configuration after the change. Exactly what prompted the revert wasn't written down (in the repo, at least).

This is another attempt at simplifying chefstyle so that we don't need to vendor RuboCop configs. I put care into providing the step-by-step in each commit comment, including why several cops are now commented out in chefstyle.yml. Once this has been reviewed I plan on submitting a similar PR to cookstyle.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

  • I have read the CONTRIBUTING document.
  • I have run the pre-merge tests locally and they pass.
  • I have updated the documentation accordingly.
  • I have added tests to cover my changes.
  • All new and existing tests passed.
  • All commits have been signed-off for the Developer Certificate of Origin.

See https://docs.rubocop.org/rubocop/configuration.html#generic-configuration-parameters

```
$ rubocop -c config/disable_all.yml --show-cops
Error: configuration for Syntax cop found in config/disable_all.yml
It's not possible to disable this cop.
```

It's re-enabled in chefstyle.yml anyhow

Confirmed no change in cop configuration
```
$ ./bin/chefstyle --show-cops | sha256sum
faa8fd05273862f47447a5357b8001976e8badb8d53c4e761f046383396930b5  -
```

Signed-off-by: David Crosby <dcrosby@fb.com>
In the course of updating the pinned RuboCop versions, there hadn't been
changes to the enabled upstream defaults in chefstyle.yml, and so they've been
silently broken. This becomes noticeable when running `rubocop -c
config/chefstyle.yml`.

The decisions on how I did this:
- Enabled cops renamed? Comment out for now to keep parity, the re-enabling of those cops should be done in a
separate PR to this one (which is designed to simplify the chefstyle
internals).
- Disabled cops renamed? Update name, keep parity.
- Cop removed entirely? Remove cop from config, keep parity.

This is all to say that this commit changes nothing:
```
$ ./bin/chefstyle --show-cops | sha256sum
faa8fd05273862f47447a5357b8001976e8badb8d53c4e761f046383396930b5  -
```

Signed-off-by: David Crosby <dcrosby@fb.com>
…op vendoring upstream.yml

Here's the interesting part of the PR stack. Instead of clobbering the RuboCop
default constants, load config/default.yml into the default configuration with
RuboCop::ConfigLoader#default_configuration=

We don't need to keep vendoring upstream.yml, since we're pinning the RuboCop
version anyhow. As seen with the earlier chefstyle.yml issues, the more
effective way of handling new lints in RuboCop upgrades is using `diff` and
`sha256sum` against `--show-cops`.

As with before, this maintains `--show-cops` parity
```
$ ./bin/chefstyle --show-cops | sha256sum
faa8fd05273862f47447a5357b8001976e8badb8d53c4e761f046383396930b5  -
```

Signed-off-by: David Crosby <dcrosby@fb.com>
This changes the sha256 of `--show-cops` from
faa8fd05273862f47447a5357b8001976e8badb8d53c4e761f046383396930b5 to
bb9e6dd780a44bbe3f193644eb3db7389fae2a1c2b80cf3653dfd332d8842511

However, running `diff` against the output shows that it's cosmetic YAML
changes - the `Enabled:` line has moved:

```
--- before      2023-09-20 10:45:00.948536892 -0700
+++ after       2023-09-20 10:46:44.887777282 -0700
@@ -77,8 +77,8 @@

 # Department 'Chef/Ruby' (6):
 Chef/Ruby/GemspecLicense:
-  Description: All gemspec files should define their license.
   Enabled: true
+  Description: All gemspec files should define their license.
   VersionAdded: 1.7.0
   Include:
   - "**/*.gemspec"
@@ -88,37 +88,37 @@

 # Supports --auto-correct
 Chef/Ruby/GemspecRequireRubygems:
-  Description: Rubygems does not need to be required in a Gemspec
   Enabled: true
+  Description: Rubygems does not need to be required in a Gemspec
   VersionAdded: 1.3.0
   Include:
   - "**/*.gemspec"

 Chef/Ruby/LegacyPowershellOutMethods:
+  Enabled: true
   Description: Use powershell_exec!/powershell_exec instead of the slower legacy powershell_out!/powershell_out
     methods.
-  Enabled: true
   VersionAdded: 1.6.0

 # Supports --auto-correct
 Chef/Ruby/RequireNetHttps:
+  Enabled: true
   Description: net/https is deprecated and just includes net/http and openssl. We should
     include those directly instead
-  Enabled: true
   VersionAdded: 1.3.0

 # Supports --auto-correct
 Chef/Ruby/Ruby27KeywordArgumentWarnings:
+  Enabled: true
   Description: Pass options to shell_out helpers without the brackets to avoid Ruby
     2.7 deprecation warnings.
-  Enabled: true
   VersionAdded: 1.3.0

 # Supports --auto-correct
 Chef/Ruby/UnlessDefinedRequire:
+  Enabled: true
   Description: Workaround RubyGems' slow requires by only running require if the constant
     isn't already defined
-  Enabled: true
   VersionAdded: 1.3.0
   Include:
   - lib/**/*
```

Signed-off-by: David Crosby <dcrosby@fb.com>
Signed-off-by: David Crosby <dcrosby@fb.com>
Signed-off-by: David Crosby <dcrosby@fb.com>
@tpowell-progress tpowell-progress self-assigned this Oct 31, 2023
@sean-simmons-progress sean-simmons-progress merged commit e65492e into chef:main Oct 31, 2023
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3 participants