chore: simplified default patterns initialization

[denis256]

Description

Fixes #5806.

TODOs

Read the Gruntwork contribution guidelines.

• I authored this code entirely myself
• I am submitting code based on open source software (e.g. MIT, MPL-2.0, Apache)]
• I am adding or upgrading a dependency or adapted code and confirm it has a compatible open source license
• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

Added / Removed / Updated [X].

Migration Guide

Summary by CodeRabbit

• Refactor

  • Streamlined retry mechanism initialization to enhance system reliability and code maintainability.

• Documentation

  • Clarified documentation for transient error detection patterns used in retry operations, including terraform and tofu compatibility details.

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Project	Deployment	Actions	Updated (UTC)
terragrunt-docs	Ready	Preview, Comment	Apr 30, 2026 5:45pm

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ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro

Run ID: ecc60857-dae3-45e7-b7ea-15b2852a3728

📥 Commits

Reviewing files that changed from the base of the PR and between 45fe7da and f8ff005.

📒 Files selected for processing (1)

• internal/retry/defaults.go

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📝 Walkthrough

Walkthrough

The changes refactor DefaultRetryableRegexps initialization in internal/retry/defaults.go from an init() function using regexp.Compile with custom error handling to a package-level variable initialized via an IIFE using regexp.MustCompile. Documentation for DefaultRetryableErrors is updated to clarify these are terraform/tofu transient error regex patterns.

Changes

Cohort / File(s)	Summary
Retry Pattern Initialization internal/retry/defaults.go	Refactors DefaultRetryableRegexps variable initialization from init() function with regexp.Compile and custom panic formatting to IIFE with regexp.MustCompile. Removes explicit compile-error handling and updates DefaultRetryableErrors documentation to describe patterns as terraform/tofu transient error regexes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR description references the linked issue #5806 but lacks detailed explanation of changes, specific implementation details, and contains incomplete release notes and migration guide sections.	Provide detailed explanation of what was changed and why, complete the release notes with specific changes made, and clarify whether this is backward compatible.
Out of Scope Changes check	❓ Inconclusive	The changes are limited to default patterns initialization refactoring; however, commit messages mention both patterns and errors initialization, suggesting potential scope expansion beyond the title.	Clarify whether changes to default errors initialization are in scope for issue #5806 or if they represent out-of-scope modifications to the PR.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: simplifying default patterns initialization from init function to IIFE approach.
Linked Issues check	✅ Passed	The PR successfully replaces init function initialization with function-based pattern building as required by issue #5806, improving the initialization approach.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 5806-patterns-init

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