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This reverts commit 06b934e.
Co-authored-by: AlexandreYang <49917914+AlexandreYang@users.noreply.github.com>
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This reverts commit f73a022.
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Resolve conflict in register_builtins.go (both sides added new builtins) and update tr builtin to use the new MakeFlags API introduced on main. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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I made changes but couldn't push them because the branch was updated while I was working. Please check the session to see my changes. SummaryComprehensive code review of the
Root Cause & FixThe primary bug was in operand validation logic. The check at line 109 ( Testing
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Review Summary
Scope: New tr builtin command — 742 lines of implementation + 707 lines of tests across 3 test files + 15 YAML scenarios + 2 lines in register_builtins.go.
Overall assessment: Needs fixes (P2 issues)
The implementation is well-structured with good security properties: no filesystem access, fixed-size read buffers, maxSetLen caps, context cancellation checks in all read loops, and proper streaming I/O. The test coverage is thorough with unit tests, GNU compatibility tests, and pentest probes.
| # | Priority | File | Finding |
|---|---|---|---|
| 1 |  |
interp/builtins/tr/tr.go:102 |
Error message quoting diverges from GNU tr (%q double quotes vs single quotes) |
| 2 | |
SHELL_FEATURES.md / README.md |
tr not documented in project docs |
| 3 |  |
tests/scenarios/cmd/tr/errors/unknown_flag.yaml |
Uses stderr_contains instead of expect.stderr per project convention |
Positive Observations
- Memory safety: Fixed 32 KiB read buffer, 1 MiB max set length cap, 1 MiB max repeat count — no user-controlled unbounded allocations.
- Context cancellation: Every read loop checks
ctx.Err()at each iteration. - Streaming I/O: Output is written in chunks, never buffered entirely in memory.
- No filesystem access:
tronly reads from stdin — no sandbox bypass vector. - No dangerous imports: Only
context,io,strconv, and the builtins package. - Comprehensive pentest suite: Tests cover flag injection, large input, context timeout, repeat construct edge cases, equivalence class attacks, and pipe chaining.
- Fix error message quoting: use single quotes to match GNU tr style - Guard complementSet against panic with duplicate-heavy sets (cap could go negative) - Fix translate passthrough when -t truncates set1 to empty (was dropping input) - Reject tr -ds without STRING2 (match GNU tr validation) - Fix escaped CHAR parsing in [CHAR*REPEAT] patterns (e.g. [\n*2]) - Add tr and test to SHELL_FEATURES.md and README.md Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Use BoolVarP + MarkHidden for -C flag so only the short form is accepted (GNU tr rejects --COMPLEMENT) - Defensively return "invalid repeat construct" from rptErrMsg for the empty countStr path instead of an empty string Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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I pushed the changes you requested: SummaryComprehensive code review of the
Root Cause & FixThe equivalence class parser at line 417 extracted raw bytes between Testing
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add stdout_contains_windows for ls -l tests since Windows uses -rw-rw-rw- permissions - Add stderr_windows for sandbox test since /etc doesn't exist on Windows (different error message) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Reject non-upper/lower character classes in STRING2 during translation, matching GNU tr: "when translating, the only character classes that may appear in string2 are 'upper' and 'lower'" - Reject equivalence classes ([=c=]) in STRING2 during translation, matching GNU tr: "[=c=] expressions may not appear in string2 when translating" - Allow empty STRING1 with empty STRING2 (tr '' '') as a no-op passthrough, matching GNU tr behavior Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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iteration 2 self-review result: APPROVE
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Review-Fix Loop Summary
Iteration log
Final state
Remaining issues (if any)
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Code Review — tr Builtin Implementation
Overall assessment: Needs minor fixes — the implementation is well-structured, secure, and correct. One P2 finding regarding test scenario annotations that will cause bash comparison test failures.
Summary table
| # | Priority | File | Finding |
|---|---|---|---|
| 1 | |
tests/scenarios/cmd/tr/errors/*.yaml |
Error scenarios missing skip_assert_against_bash: true — will fail bash comparison tests |
| 2 | |
tests/scenarios/cmd/tr/errors/*.yaml |
Some error scenarios use stderr_contains where exact stderr match is preferred per AGENTS.md |
Security
- ✅ No direct filesystem access — all I/O goes through
callCtx.Stdin/callCtx.Stdout - ✅ Fixed-size buffer reads (32 KiB) prevent memory proportional to input
- ✅
maxSetLen(1 MiB) andmaxRepeat(1 MiB) caps prevent unbounded allocation - ✅ Context cancellation checked in
processLoopmain loop - ✅ Only safe imports:
context,errors,fmt,io,strconv - ✅ Byte-level 256-entry lookup tables — no injection vectors
- ✅
expandCharClassreturns defensive copies of shared slices
Bash Compatibility
- ✅ Translation, deletion, squeezing, complement, truncate all match GNU coreutils behavior
- ✅ Set2 padding with last character (BSD behavior) matches GNU tr
- ✅ Octal escape handling with ambiguity warnings matches GNU tr
- ✅
[c*n]repeat construct with octal/decimal/fill semantics correct - ✅ Character class definitions match POSIX C locale
Correctness
- ✅ Edge cases well-handled: empty sets, single-char ranges, complement of large sets
- ✅ Case class alignment validation for
[:upper:]/[:lower:]pairs - ✅ Error paths produce informative messages with correct exit codes
Test Coverage
- ✅ Good scenario test coverage for happy paths
- ✅ Comprehensive Go unit tests, GNU compat tests, and pentest suite
- ✅ Context timeout and large input tests cover resource safety
Positive Observations
- Clean separation between set expansion, I/O loop, and mode-specific transforms
- The
processLoop+chunkTransformpattern is elegant and reusable - Thorough pentest suite covering flag injection, resource exhaustion, and edge cases
- Good defensive coding (maxSetLen cap, context checks, buffer reuse)
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Iteration 1 self-review result: COMMENT — 2 findings (1×P2, 1×P3). P2: 8 error scenario tests missing |
…at, exact stderr
- Add skip_assert_against_bash: true to 11 error scenario tests whose error
messages intentionally differ from GNU coreutils tr
- Switch 3 error scenarios from stderr_contains to exact stderr match
- Reject negative-prefixed repeat counts (e.g. [b*-0]) in parseRepeat to
match GNU tr behavior — strconv.ParseInt("-0") returns 0 which was
incorrectly treated as fill mode
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Code Review — Iteration 2 (Self-review: APPROVE — no new findings)
Overall assessment: Safe to merge
All findings from iteration 1 have been addressed:
- ✅ P2 — skip_assert_against_bash: Added to all 11 error scenario files
- ✅ P3 — exact stderr match: Switched 3 scenarios from
stderr_containsto exactstderr: - ✅ P3 — negative-zero repeat: Added early
-prefix check inparseRepeat(line 746)
Verification
- All CI checks passing (8/8)
- No new security concerns introduced
- No regressions in test coverage
- Implementation remains clean and well-bounded
Remaining note
One unresolved Codex thread (P2 — complement truncate with -tc) was replied to with analysis. The current behavior appears correct (mapsToSingleByte("x") = true). Left for reviewer to verify against GNU tr.
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Iteration 2 self-review result: APPROVE — 0 findings. All iteration 1 findings verified as fixed. No new issues or regressions introduced. |
Review-Fix Loop Summary
Iteration log
Final state
Remaining issues
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…; add review dimension G Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Review Summary
Reviewed the full tr builtin implementation (~820 lines), 3 test files (~620 lines), 25 YAML scenario files, and supporting changes (registration, SHELL_FEATURES.md).
Overall assessment: Safe to merge with minor suggestions (P3 only).
Security Assessment
No security concerns found. The implementation:
- Uses no filesystem access — reads exclusively from
callCtx.Stdinvia the providedio.Reader - Imports only safe standard library packages:
context,errors,fmt,io,strconv - Processes input in fixed 32 KiB chunks with a 1 MiB cap on set expansion, preventing memory exhaustion
- Checks
ctx.Err()on every chunk read to honor execution timeouts - Has no path handling, no command execution, no network access
Bash Compatibility Assessment
All error messages, exit codes, and behavioral outputs verified against GNU coreutils tr 9.6 on debian:bookworm-slim. The 5 scenarios with skip_assert_against_bash: true are all justified (error messages differ from bash by a trailing "Try 'tr --help' for more information." line, or the help output format differs).
Findings Summary
| # | Priority | File | Finding |
|---|---|---|---|
| 1 | |
interp/builtins/tr/tr.go:460 |
needed can go negative after min() — add a clamp for clarity |
| 2 | |
tests/scenarios/cmd/tr/ |
Missing scenario: delete + complement + char class (-dc '[:alpha:]') |
Coverage Table
| Code path | Scenario test | Go test | Status |
|---|---|---|---|
| Basic translate | translate/range_lower_to_upper.yaml | tr_test.go, tr_gnu_compat_test.go | Covered |
| Delete mode | delete/basic.yaml | tr_test.go | Covered |
| Delete + complement | delete/complement.yaml | tr_test.go | Covered |
| Delete + squeeze | — | tr_test.go:161 | Covered (Go only) |
| Squeeze only | squeeze/basic.yaml | tr_test.go | Covered |
| Translate + squeeze | squeeze/translate_and_squeeze.yaml | tr_test.go | Covered |
| Complement translate | — | tr_gnu_compat_test.go:184 | Covered (Go only) |
| Truncate mode | translate/truncate.yaml | tr_test.go | Covered |
| Set1 longer (BSD pad) | translate/set1_longer.yaml | tr_test.go, tr_gnu_compat_test.go | Covered |
| Character classes | classes/lower_to_upper.yaml, classes/delete_digits.yaml | tr_test.go | Covered |
| Ranges | translate/range_lower_to_upper.yaml | tr_test.go | Covered |
| Backslash escapes | — | tr_test.go:215-241 | Covered (Go only) |
| Repeat constructs | translate/repeat_fill_with_suffix.yaml | tr_test.go, pentest_test.go | Covered |
| Fill repeat [c*] | translate/repeat_fill_with_suffix.yaml | tr_test.go:401 | Covered |
| Empty input | translate/empty_sets.yaml | tr_test.go:423, tr_gnu_compat_test.go:134 | Covered |
| All error paths (12) | errors/*.yaml (12 files) | tr_test.go | Covered |
| Context cancellation | — | tr_test.go:393 | Covered (Go only) |
| Large input (100K) | — | pentest_test.go:88 | Covered (Go only) |
| Pipe chain | — | pentest_test.go:172 | Covered (Go only) |
| Case class alignment | — | tr_test.go:321-367 | Covered (Go only) |
delete + complement + char class |
— | pentest_test.go:182 | Partial (Go only, no scenario) |
Overall coverage: Adequate — all meaningful code paths are tested.
skip_assert_against_bash Audit
| Scenario file | Bash matches? | Flag needed? | Status |
|---|---|---|---|
| errors/missing_operand.yaml | No (bash adds "Try 'tr --help'...") | Yes | OK |
| errors/missing_second_operand.yaml | No (bash adds extra lines) | Yes | OK |
| errors/delete_extra_operand.yaml | No (bash adds "Try 'tr --help'...") | Yes | OK |
| errors/unknown_flag.yaml | No (different flag parser output) | Yes | OK |
| hardening/help.yaml | No (different help format) | Yes | OK |
All 5 flags are justified.
Positive Observations
- Excellent memory safety design: Byte-at-a-time processing with fixed-size buffers (32 KiB read, 1 MiB set cap) prevents any allocation proportional to input size.
- Clean I/O pattern: The
processLoop+chunkTransformabstraction is well-factored and avoids code duplication across modes. - Thorough error handling: All parsing paths return descriptive error messages matching GNU tr format.
- Defensive coding: Defensive copy of
charClasses(line 594),seenFillflag to prevent recursive fill,maxRepeatcap. - Strong test coverage: 25 YAML scenarios, comprehensive Go unit tests, GNU compat suite, and pentest suite.
- Context-aware: Every I/O loop checks
ctx.Err()for timeout support.
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Iteration 1 self-review result: COMMENT
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… add complement_class scenario - Clamp `needed` with `max(..., 0)` after `min()` to avoid negative values when `len(result) > maxSetLen` (cosmetic clarity, not a bug). - Add YAML scenario for `tr -dc '[:alpha:]'` to provide bash-comparison coverage for the complement+delete+character-class path. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace if-guard + max(min(...), 0) with a cleaner max() + min() pair, resolving the modernize linter suggestion. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Review Summary (Iteration 2)
Reviewed the two commits added since iteration 1 (c4eafa4 and 73d7bf6), plus a full re-pass of the implementation.
Changes in this iteration
tr.goline 456: Simplifiedneededclamping from a manualif needed < 0 { needed = 0 }tomax(set1Len-(len(result)+len(tail)), 0). This is functionally equivalent and cleaner.- New scenario
tests/scenarios/cmd/tr/delete/complement_class.yaml: Teststr -dc '[:alpha:]'— correctly expects only alpha characters to survive. Not skipped against bash (correct, since this matches GNU tr behavior).
Full re-review findings
No new issues found. Specifically verified:
- Security: No filesystem access, no external command execution, no
os/execorunsafeimports. All I/O goes throughCallContextstdin/stdout. Memory bounded bymaxSetLen(1 MiB) and fixed 32 KiB read buffer. Context cancellation checked in the I/O loop. - Correctness: The
min(needed, maxSetLen-len(result))expression on line 457 is safe even whenlen(result) > maxSetLen(can happen briefly after class expansion) becausefor range negative_intproduces zero iterations in Go. RecursiveexpandSetBytescall is bounded to depth 2 viaseenFillflag. - Bash compatibility: 5 scenarios correctly use
skip_assert_against_bash: true(help text, error messages that differ from GNU tr). The remaining 8 error scenarios and all functional scenarios are validated against bash. - Test coverage: Adequate — 26 YAML scenarios, comprehensive Go unit tests, GNU compat tests, and pentest coverage.
Positive observations
- Clean byte-at-a-time architecture with 256-entry lookup tables — no allocation proportional to input size
- Good separation of concerns: processLoop handles I/O, mode-specific functions provide transform closures
- Defensive
maxSetLencap on set expansion prevents memory abuse seenFillflag prevents unbounded recursion in fill-repeat parsing- Context cancellation is properly checked in the I/O loop
Overall assessment: safe to merge. The iteration 2 changes are minimal, correct, and introduce no new issues.
…t -tc with complement class - Allow explicit repeat counts [c*n] in STRING1 (GNU tr accepts these, only fill repeats [c*] are STRING2-only) - Allow explicit repeat counts in STRING2 for delete+squeeze mode (GNU tr expands [c*n] in the squeeze set) - Reject -tc with complemented character classes (GNU tr rejects truncation with complement+class regardless of STRING2 content) - Add 3 scenario tests with bash comparison coverage Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Iteration 2 self-review result: COMMENT (no new issues)
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Summary
Testing
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Review Summary — Iteration 3
Reviewed the full tr builtin implementation with focus on commit f520198 (allow [c*n] in STRING1, repeats in -ds STRING2, reject -tc with complemented char class).
Overall Assessment: Safe to merge (minor comment-only finding)
All three behavioral changes in f520198 have been verified against GNU bash + coreutils (debian:bookworm-slim) and produce byte-for-byte identical output:
echo abc | tr '[a*3]' x→xbc✓echo aaab | tr -d -s a '[x*3]'→b✓echo test | tr -tc '[:lower:]' x→ error, exit 1 ✓
The parseRepeat / expandSetBytes guard logic correctly distinguishes fill repeats ([c*], [c*0]) from explicit-count repeats ([c*3]), and the new -tc rejection matches GNU tr's behavior where truncation makes full-domain complement mapping impossible.
Security
- No filesystem access — reads stdin, writes stdout only ✓
- No unsafe imports (
context,errors,fmt,io,strconv+builtins) ✓ - Memory bounded by
maxSetLen(1MB) andmaxRepeat(1MB) ✓ - I/O bounded by 32KiB read buffer with context cancellation ✓
- No sandbox bypass vectors identified ✓
Bash Compatibility
All 23 non-skipped scenario tests match GNU bash output. The 5 skip_assert_against_bash: true scenarios are all justified (differ in "Try 'tr --help'" suffix or custom help text).
Findings
| # | Priority | File | Finding |
|---|---|---|---|
| 1 | |
interp/builtins/tr/tr.go:167 |
Misindented comment (extra tab on first line) |
Test Coverage
| Code path | Scenario test | Go test | Status |
|---|---|---|---|
[c*n] explicit repeat in STRING1 |
repeat_explicit_in_string1.yaml | — | Covered |
[c*n] explicit repeat in -ds STRING2 |
repeat_in_ds_mode.yaml | — | Covered |
Reject -tc with complemented char class |
truncate_complemented_char_class.yaml | — | Covered |
[c*] fill rejected in STRING1 |
repeat_in_string1.yaml | TestTrPentestRepeatFillEmptyCount | Covered |
[c*] fill rejected in non-translate STRING2 |
repeat_in_string2_non_translate.yaml | — | Covered |
| Complement+class with multi-byte S2 | complemented_char_class_requires_single_mapping.yaml | — | Covered |
[c*] fill in translate mode |
repeat_fill_with_suffix.yaml | TestTrRepeatZeroInSet2 | Covered |
Coverage: Adequate — all new code paths from f520198 are covered by scenario tests validated against bash.
Positive Observations
- Clean separation of fill vs explicit repeat logic makes the code easy to reason about
- Good defensive comment placement explaining GNU-specific behavior
- All new scenarios are validated against bash (no unnecessary
skip_assert_against_bash) - The
maxSetLen/maxRepeatcaps and context-aware I/O loop are solid DoS protections
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Iteration 3 self-review result: COMMENT (1×P3)
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Review-Fix Loop Summary
Iteration log
Final state
Remaining issuesNone. All findings have been addressed and verified. |
What does this PR do?
Implements the POSIX
trcommand as a safe builtin in the restricted shell interpreter. The command translates, squeezes, and/or deletes characters from standard input.Supported flags:
-d(delete),-s(squeeze-repeats),-c/-C(complement),-t(truncate-set1),-h(help).Full set notation support: ranges (
a-z), character classes ([:alnum:],[:lower:], etc.), equivalence classes ([=c=]), repeat constructs ([c*n],[c*]), and backslash escapes (\n,\t,\NNN).Motivation
Extends the shell's builtin command set with
tr, a commonly used text processing utility. The implementation operates on bytes (0–255) using a 256-entry lookup table and streams input in fixed 32 KiB chunks, ensuring bounded memory usage and safe handling of infinite sources.Testing
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