android-encrypted-archiver/.planning/phases/08-rust-directory-archiver/08-01-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
08-rust-directory-archiver	01	archive	rust directory-traversal unix-permissions binary-format toc-entry	phase provides 07-format-spec-update v1.1 FORMAT.md with entry_type, permissions fields, directory entry semantics	v1.1 TocEntry with entry_type and permissions fields (format.rs) Recursive directory traversal in pack with relative paths Directory hierarchy restoration with Unix mode bits in unpack Entry type and permissions display in inspect Directory round-trip integration tests	09-backward-compat 10-hardening 11-polish	added patterns collect_entries pattern for recursive directory traversal DFS preorder for parent-before-child ordering ProcessedFile entry_type discriminator for file vs directory handling	created modified src/format.rs src/archive.rs src/cli.rs tests/round_trip.rs	DFS preorder traversal with sorted children for deterministic parent-before-child ordering Directory entries use zero-filled crypto fields (no data block) per FORMAT.md v1.1 Permissions captured via std::os::unix::fs::PermissionsExt::mode() & 0o7777 Standalone files use filename-only names; directory children use relative paths with / separator	collect_entries(): unified entry collection for mixed file/directory inputs process_file(): extracted crypto pipeline into reusable function make_directory_entry(): factory for zero-length directory ProcessedFile	DIR-01 DIR-02 DIR-03 DIR-04 DIR-05	6min	2026-02-26

Phase 8 Plan 01: Rust Directory Archiver Summary

v1.1 format implementation with recursive directory traversal, Unix permission preservation, and directory/file type discrimination in pack/unpack/inspect

Performance

• Duration: 6 min
• Started: 2026-02-26T18:42:02Z
• Completed: 2026-02-26T18:48:33Z
• Tasks: 3
• Files modified: 4

Accomplishments

• Updated format.rs to v1.1 binary layout: VERSION=2, TocEntry with entry_type (u8) and permissions (u16), entry_size=104+name_length
• Implemented recursive directory traversal in pack() with parent-before-child ordering and relative path naming
• unpack() creates full directory hierarchy, restores Unix mode bits on both files and directories
• inspect() displays entry type (dir/file) and octal permissions for each TOC entry
• All 41 tests pass: 25 unit + 7 golden + 9 integration (3 new directory tests)

Task Commits

Each task was committed atomically:

1. Task 1: Update format.rs for v1.1 TOC entry layout - 4e25d19 (feat)
2. Task 2: Update archive.rs and cli.rs for directory support - 7820c18 (feat)
3. Task 3: Add directory round-trip integration test - 8760981 (test)

Files Created/Modified

• src/format.rs - v1.1 TocEntry with entry_type/permissions, VERSION=2, entry_size=104+N
• src/archive.rs - Recursive directory traversal, permission capture/restore, directory-aware pack/unpack/inspect
• src/cli.rs - Updated doc comments for directory support
• tests/round_trip.rs - 3 new tests: directory round-trip, mixed files+dirs, inspect directory info

Decisions Made

• Used DFS preorder with sorted children for deterministic parent-before-child ordering (no external walkdir dependency)
• Extracted crypto pipeline into process_file() helper for reuse between single-file and directory-file processing
• Directory entries skip data_offset computation and data block writing (offset=0, no ciphertext)
• Permissions always stored as lower 12 bits of mode_t (0o7777 mask) per FORMAT.md v1.1 spec

Deviations from Plan

Auto-fixed Issues

1. [Rule 3 - Blocking] Added entry_type/permissions to archive.rs ProcessedFile during Task 1

• Found during: Task 1 (format.rs update)
• Issue: After adding new fields to TocEntry, archive.rs TocEntry constructions failed to compile
• Fix: Added entry_type and permissions fields to ProcessedFile struct and its construction in pack()
• Files modified: src/archive.rs
• Verification: cargo test --lib format:: passed all 13 tests
• Committed in: 4e25d19 (Task 1 commit)

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Total deviations: 1 auto-fixed (1 blocking) Impact on plan: Necessary compilation fix from cross-file dependency. No scope creep.

Issues Encountered

None -- all tasks executed smoothly after the blocking compilation fix.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• v1.1 format fully implemented and tested
• Ready for Phase 9 (backward compatibility) or Phase 10 (hardening) if planned
• All existing v1.0 tests updated to v1.1 format (no backward compat with v1.0 archives per decision)

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Phase: 08-rust-directory-archiver Completed: 2026-02-26