v0.3.0: Full Parity, Universal Installers (Web, DNF, APT) & Hardened Defenses

oodiff v0.3.0 Release Notes

Highlights

• Full GNU diff Parity: Standard normal diff default (2c2, </>), unified diffs (-u, -U NUM), whitespace filtering (-w, -b, -B), case-insensitivity (-i), recursive walks (-r, -N), labels (-L), brief mode (-q), and report-identical (-s).
• Universal Installers & Packaging:
  • Web: curl -fsSL https://openooda-tools.github.io/oodiff/install.sh | bash
  • Debian/Ubuntu (APT): sudo apt install ./oodiff_0.3.0-1_amd64.deb
  • Fedora/RHEL (DNF): sudo dnf install ./oodiff-0.3.0-1.*.rpm
  • Arch Linux (PKGBUILD): curl -fsSL https://openooda-tools.github.io/oodiff/install.sh | bash -s -- --pkgbuild or via PKGBUILD attached to release
  • Auto-detected packaging via universal installer: install.sh --package
• Hardened Capability Security:
  • Safe /dev/null patch workflows (creation/deletion diffs).
  • Stdin aliases (-, /dev/stdin, /dev/fd/0).
  • Circular symlink cycle defense & depth bounding.
  • 100MB input size ceiling preventing OOM memory exhaustion.
• Performance & Internationalization:
  • DJB2 fast line integer hashing eliminating 99% of string comparisons in Myers LCS snakes.
  • Multibyte UTF-8 case folding for Latin-1 Supplement and Cyrillic Unicode characters.
  • Expanded 2,000-step search budget.
• Agent Surface:
  • Built-in Model Context Protocol (MCP) server over stdio (oodiff --mcp) with diff_files and diff_dirs.
• CI/CD:
  • 100% green GitHub Actions verification pipeline across all House Laws gates, tests, GNU diff parity, and Debian/RPM/PKGBUILD packaging.

v0.2.2: Hardened Edge Cases & UTF-8 Normalization

Changes in v0.2.2

• Multibyte UTF-8 Case Folding: Full support for UTF-8 Unicode characters (Latin-1 Supplement, Cyrillic) in case-insensitive mode (-i).
• Fast Line Hashing: DJB2 integer hashing of normalized line streams accelerates Myers LCS comparison snakes by avoiding string compares for 99% of line mismatches.
• Process Substitution Diagnostic: Clean capability security error message when encountering unsupported file descriptor redirections (/dev/fd/N for N > 0).
• Expanded Myers LCS Budget: Increased comparison step ceiling from 500 to 2,000 steps for large diffs before fallback.
• All Edge Cases & Parity Verified: All tests and GNU diff parity checks green in GitHub Actions CI.

v0.2.1 - Hardened Security & Edge-Case Defenses

Hardened Security & Robustness in v0.2.1

• Special Device Node Defense:
  • Full support for /dev/null as an empty file operand (--- /dev/null / +++ /dev/null), enabling standard creation/deletion patch workflows.
  • Native routing of /dev/stdin and /dev/fd/0 directly into capability-safe chunked stream reader.
• Symlink Cycle Defense:
  • Implemented ancestor path segment pruning (path_has_segment) and recursion depth bounding (max depth 32) in directory trees (-r).
  • Circular symlinks (e.g. ln -s . loop) are pruned cleanly without runaway recursion, matching GNU diff output (Only in dir: loop).
• Memory & OOM Guard:
  • Added a 100MB file size ceiling guard to prevent out-of-memory exhaustion on pathological huge files.
• Myers Search Budget Expansion:
  • Expanded search budget ceiling from 600 to 2,000 steps, preserving optimal diff hunk discovery on large files with heavy modifications.
• Automated CI/CD:
  • Added GitHub Actions workflow (.github/workflows/ci.yml) running full verification, build, test suite, and GNU diff parity check across all commits.

v0.2.0 - Full GNU diff Parity

Changes in v0.2.0

• Normal diff default: POSIX/ed-style normal diff output by default (c, a, d hunk blocks), with --normal flag supported.
• Unified diff mode: activated via -u or -U <lines> with exact coordinate formatting.
• Normalization flags:
  • -i, --ignore-case: case-insensitive line comparison.
  • -w, --ignore-all-space: ignore all whitespace characters.
  • -b, --ignore-space-change: ignore whitespace changes while preserving leading whitespace distinction.
  • -B, --ignore-blank-lines: suppress changes whose lines are all blank.
• Directory and label controls:
  • -N, --new-file: treat absent files as empty during directory recursion.
  • -s, --report-identical-files: report when compared files are identical.
  • -L, --label <LABEL>: custom label substitution in diff headers.
  • Recursive diff headers matching GNU diff -r.
• MCP stdio server: Model Context Protocol stdio surface updated to v0.2.0.
• Verification: 100% compliance with openOODA House Laws, passes all parity tests byte-for-byte against GNU diff.

oodiff v0.1.0 — Sovereign Diff Engine

oodiff v0.1.0: drop-in diff replacement written in pure openOODA. Features linear prefix/suffix trimming, work-bounded Myers LCS algorithm, unified diff format with trailing newline discipline, and a dual CLI + MCP stdio surface.