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[codex] implement practical awk phase 1#234

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[codex] implement practical awk phase 1#234
matt-dz wants to merge 18 commits intocodex/awk-bwk-testsfrom
codex/awk-phase-1

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@matt-dz matt-dz commented May 6, 2026

Summary

  • add a new awk builtin with a long-lived lexer/parser/AST/runtime foundation for the Phase 1 Practical awk profile
  • support inline programs, -f, -F, -v, stdin / -, BEGIN / main / END rules, read-only fields and core variables, print, scalar assignment, arithmetic/comparison/boolean expressions, regex patterns and match operators, and string concatenation
  • reject unsafe or deferred features such as system(), command pipes, print redirection, getline, arrays, control flow, printf, regex FS, and field mutation / $0 rebuilding
  • add original Go and scenario coverage, update feature docs, register the builtin, and extend the builtin symbol allowlist
  • add a shared AWK implementation plan document and point the repo-local implement-awk skill at it

Validation

  • make fmt
  • go test ./builtins/awk ./builtins/tests/awk
  • go test ./tests -run 'TestShellScenarios/.*/cmd/awk/'
  • go test ./...
  • RSHELL_BASH_TEST=1 go test ./tests/ -run TestShellScenariosAgainstBash -timeout 120s
  • make build
  • AWK_HARNESS_CACHE=/Users/matthew.deguzman/go/src/github.com/DataDog/rshell/.claude/worktrees/codex-awk-bwk-tests/.superset/awk-harness/darwin-arm64 GAWK_TEST_FILTER=concat GAWK_TEST_LIMIT=1 RSHELL_BIN=./rshell AWK_UNDER_TEST=tools/awk-harness/rshell-awk tools/awk-harness/run.sh gawk

Note: a generic GAWK_TEST_LIMIT=5 harness run currently starts with array-focused gawk tests (aadelete, aasort, etc.) and fails as expected because arrays are intentionally outside the Phase 1 scope.

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matt-dz commented May 6, 2026

@codex review this PR

Please use the following severity format for all findings:

  • P0 (red): Exploitable vulnerability with high impact (RCE, sandbox bypass, data breach). Blocking merge.
  • P1 (orange): Likely exploitable or high-risk — correctness bugs vs bash, data races, panics.
  • P2 (yellow): Potential vulnerability, bash divergence, missing test coverage, missing docs.
  • P3 (blue): Style, minor simplification, hardening suggestion, nice-to-have test.

Prefix each finding title with its priority label, e.g. "P0: ...", "P1: ...", etc.
Include a summary table at the top with columns: # | Priority | File | Finding.

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matt-dz commented May 6, 2026

Iteration 1 self-review result: P0=0, P1=0, P2=5, P3=0.

Findings:

  • P2: awk string/numeric value attributes differ from GNU awk for string literals, concatenation, uninitialized variables, and numeric field truthiness.
  • P2: BEGIN-only programs still open input files even when there are no normal or END rules.
  • P2: division/modulo by zero returns Go Inf/NaN instead of failing.
  • P2: unsupported awk control-flow statements such as next/exit can be parsed as scalar variables.
  • P2: explicit empty -F is not detected as the deferred/unsupported empty FS case.

I do not have the repo-local /code-review command in this environment, so this is a manual self-review result; I am fixing these directly in iteration 1.

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matt-dz commented May 6, 2026

Iteration 2 self-review result: P0=0, P1=0, P2=0, P3=0.

Manual re-review of the current head after f3d5cc8 found no remaining blocking awk Phase 1 issues. I also verified the fixed string/numeric cases against the pinned gawk oracle.

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matt-dz commented May 6, 2026

Review-Fix Loop Summary

Iteration log

# Unresolved threads P0/P1/P2 findings Fixes applied CI status
1 3 5 1 commit pushed (f3d5cc8a) Passing
2 0 0 3 Codex threads replied to and resolved Passing

Final state

  • Unresolved threads: 0 from trusted authors (matt-dz, chatgpt-codex-connector, chatgpt-codex-connector[bot])
  • P0/P1/P2 findings: 0 (P3 findings are not blocking)
  • CI: Passing (devflow/mergegate SUCCESS)

Verification

  • make fmt
  • go test ./builtins/awk ./builtins/tests/awk
  • go test ./tests -run 'TestShellScenarios/.*/cmd/awk/'
  • go test ./...
  • RSHELL_BASH_TEST=1 go test ./tests/ -run TestShellScenariosAgainstBash -timeout 120s
  • make build
  • Pinned gawk oracle spot checks for the fixed string/numeric cases

Remaining issues

None.

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matt-dz commented May 6, 2026

@codex review this PR

Codex-only review loop request. Please review the current head and leave actionable inline findings only. Use this severity format:

  • P0 (red): Exploitable vulnerability with high impact (RCE, sandbox bypass, data breach). Blocking merge.
  • P1 (orange): Likely exploitable or high-risk — correctness bugs vs bash/gawk, data races, panics.
  • P2 (yellow): Potential vulnerability, supported-feature behavior divergence, missing test coverage, missing docs.
  • P3 (blue): Style, minor simplification, hardening suggestion, nice-to-have test.

Prefix each finding title with its priority label, e.g. "P0: ...", "P1: ...", etc.

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matt-dz commented May 6, 2026

@codex review this PR

Codex-only review loop pass 2. Please review the current head after 220b6d9 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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matt-dz commented May 6, 2026

@codex review this PR

Codex-only review loop pass 3. Please review the current head after b9d5321 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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matt-dz commented May 7, 2026

@codex review this PR

Codex-only review loop pass 4. Please review the current head after 1aac2d1 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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matt-dz commented May 7, 2026

Codex-Only Review Loop Summary

Codex-only iteration log

Pass Codex threads Fixes applied CI status
1 2 220b6d93 fixed numeric-prefix conversion and awk -f - program loading Passing
2 3 b9d53219 fixed regex context after rule separators, blank-record NF with literal FS, and parenthesized print comparisons Passing
3 2 1aac2d15 fixed post-program option parsing and regexp literal expression evaluation Passing
4 0 None Passing

Verification run for fix commits

  • make fmt
  • go test ./builtins/awk ./builtins/tests/awk
  • go test ./tests -run 'TestShellScenarios/.*/cmd/awk/'
  • go test ./analysis
  • go test ./...
  • RSHELL_BASH_TEST=1 go test ./tests/ -run TestShellScenariosAgainstBash -timeout 120s
  • make build

Final state

  • Unresolved Codex threads: 0
  • CI: Passing (devflow/mergegate SUCCESS)
  • Branch: codex/awk-phase-1 pushed and clean

Remaining issues

None from Codex review.

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@codex review this PR

Codex-only review loop pass 5. Please review the current head after 793db21 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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@codex review this PR

Codex-only review loop pass 6. Please review the current head after 87666cb and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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matt-dz commented May 7, 2026

@codex review this PR

Codex-only review loop pass 7. Please review the current head after 168598d and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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@codex review this PR

Codex-only review loop pass 8. Please review the current head after 9524224 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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@codex review this PR

Codex-only review loop pass 9. Please review the current head after 27bc18a and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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@codex review this PR

Codex-only review loop pass 10. Please review the current head after df6cf5a and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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@codex review this PR

Codex-only review loop pass 11. Please review the current head after fde8cb5 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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@codex review this PR

Codex-only review loop pass 12. Please review the current head after f636f8d and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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@codex review this PR

Codex-only review loop pass 13. Please review the current head after bc5ef21 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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matt-dz commented May 7, 2026

@codex review this PR

Codex-only review loop pass 14. Please review the current head after 1ccccf0 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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@codex review this PR

Codex-only review loop pass 15. Please review the current head after e9e205c and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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@codex review this PR

Codex-only review loop pass 16. Please review the current head after d1e9bb2 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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matt-dz commented May 7, 2026

@codex review this PR

Codex-only review loop pass 17. Please review the current head after 28b3765 and leave actionable inline findings only. Use P0/P1/P2/P3 severity prefixes as before.

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Codex Review: Didn't find any major issues. Can't wait for the next one!

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