TapTap
9fa1696eff
- --delete-delay: count/track only entries actually removed; a directory refilled before commit (ENOTEMPTY) no longer inflates Number of deleted files or the --max-delete budget (unit + integration + rsync differential). - --stats: per-type Number of files breakdown; only stored regular files count as transferred; transferred/literal byte totals and Total file size (symlink target lengths) now match rsync for whole-file transfers. - --progress: print the leading ./ root line and include the root entry in the to-chk denominator (single-file output byte-identical to rsync). - --out-format %C: use the selected transfer checksum and render every algorithm exactly like rsync; checksum_digest_file gains md4/sha1/none. Reclassify --out-format to Divergent (protocol-specific %b/delta-%c). - Docs: RSYNC_COMPAT tally 107/25/24, HANDOFF update. No wire change.
69 lines
6.9 KiB
Markdown
69 lines
6.9 KiB
Markdown
# FastSync — Session Handoff (2026-09-17)
|
|
|
|
## Current status
|
|
- **Release `v2.21.0`** tagged (`919a729`, "Release v2.21.0"); full CI green
|
|
(run 552: lint, build-and-test, ASan, UBSan, fuzz-build, coverage, valgrind).
|
|
`dev` has the release commit plus later doc-only merges (a README refresh and
|
|
this handoff).
|
|
- **Release PR #284 (`dev` -> `main`)** open, CI green (run 553).
|
|
`main` is protected: it needs review/approval to merge.
|
|
https://gitea.tap-tap.win/TapTap/FastSync/pulls/284
|
|
- **`PROTOCOL_VERSION` = `"2.26.0"`** (`src/shared/config.h`); CMake
|
|
`project(FastFileTransfer VERSION 2.26.0)`.
|
|
- Working tree clean; no wave worktrees remain.
|
|
|
|
## What landed this session
|
|
1. **Wave 8 (refactors):** Config X-macro wire table; single-owner `authorized_root`;
|
|
daemon per-module/per-host caps + cross-process auth lockout (`daemon_limits.[ch]`);
|
|
`Data` charge returns to its owning `ProtocolSession`.
|
|
2. **Wave 9 (protocol 2.21.0):** optional `STATUS_ERROR_DETAIL` rejection reasons;
|
|
server-contacting `--dry-run` (`STATUS_DRY_RUN_TRANSFER`, receiver mutates nothing).
|
|
3. **Security wave:** ran 5 parallel audits (wire parsing; daemon/transport/TLS/auth;
|
|
receiver confinement; client/CLI/SSH; crypto/memory/limits). Fixed all HIGH and the
|
|
confirmed MEDIUMs:
|
|
- SSH `-o ProxyCommand=…` argument injection (RCE) — reject leading `-`, insert `--`.
|
|
- Truncated zstd frame infinite CPU loop (remote DoS).
|
|
- FIFO receiver opens lacked `O_NONBLOCK` (indefinite hang).
|
|
- `--inplace` could write a FIFO/device (bypass of `--write-devices` gate).
|
|
- `--force` not gated by server `--allow-delete`.
|
|
- Privileged standalone server defaulted super activities on; added `--allow-super`
|
|
(never honored with `--stdio`).
|
|
- `--dry-run` content/hash oracle on `read only`/basis files removed.
|
|
- Empty `hosts allow`/`deny`/`auth users` now rejected.
|
|
- TLS: AEAD-only 1.2 + server preference, TOCTOU-safe key load, IP-SAN verify,
|
|
CN-truncation guard. Glob backtracking bounded; line reads bounded; ACL xattrs
|
|
gated on `--acls`; decompression/chunk memory charged; pre-auth `basis_count`
|
|
NULL-deref fixed.
|
|
4. **Tooling:** benchmark accuracy (data mix, verification, percentiles, `tc`,
|
|
`build-bench/`, `--warm` mode); `shell.nix` full toolchain and no build-on-entry;
|
|
docs state push-only / remote-source unsupported.
|
|
5. **Preserve-attribute split (protocol 2.22.0)** landed on `feat/preserve-attr-split`: per-attribute `-p/-t/-o/-g` + `--no-*` negations, `-a` = `-rlptgoD`, and the 2.21.0 → 2.22.0 wire bump.
|
|
6. **Rsync-parity wave (protocol 2.23.0)** on `feat/rsync-parity`: rsync short options/clustering/attached values (`-r`/`-b`/`-L`/`-B`, `-av`, `-aAX`, `-B1000`, `-essh`, `-MOPT`), `-c` checksum quick-check, `--checksum-choice`/`--compress-choice` validation and seed randomization, rsync timeout/max-alloc defaults, temp-dir confinement + `EXDEV` fallback, ownership/mapping parity (numeric-ids modifier, map ranges/`*`/empty-FROM, `--chown`+map conflicts, fake-super resolved-owner record), verbatim symlink storage with rsync `--safe-links`/`--munge-links`, socket recreation under `--specials`, `--chmod` 3.4.1 semantics, and delete scoping + `--max-delete` partial/exit-25. Wire: appended delete-manifest synchronized-directory section and `STATUS_DELETE_LIMIT`.
|
|
7. **Parity-completion wave (protocol 2.24.0 → 2.26.0)** on `feat/parity-completion`: per-directory delete plans (`STATUS_DELETE_PLAN`) for `--delete-during`/`--delete-delay`; receiver `STATUS_STATS` counters feeding `--stats`/`--progress` and `--out-format %b/%c/%C`, plus `-n --delete` lines; `lz4`/`zlib`/`zlibx` compression and `md4`/`sha1`/`none` checksums with `auto` negotiation (default `xxh128`/`zstd`); general `-R`/`--no-implied-dirs`/`-d`; the full filter grammar (`merge`/`dir-merge`/`hide`/`show`/`protect`/`risk`/`clear` + modifiers) and corrected `-F`/`-FF`; receiver-side `--chown`/map TO-name resolution; absolute basis dirs + `--link-dest` relink; receiver-side `--ignore-existing` short-circuit; `--preallocate` over `--sparse` via `fallocate(2)`; `--iconv=.`/`-`/`--no-iconv`; lone `-h` help; aliases `--ignore-non-existing`/`--protect-args`/`--msgs2stderr`; and the full `--info`/`--debug` vocabulary. `RSYNC_COMPAT.md` reclassifies the matrix to 106 ✅ / 27 ⚠️ / 23 ❌; the later rsync-parity-stats pass (`fix/parity-stats`) moves it to 107 ✅ / 25 ⚠️ / 24 ❌ (see item 8).
|
|
8. **rsync-parity-stats pass** on `fix/parity-stats` (no wire change, `PROTOCOL_VERSION` stays `2.26.0`): `--delete-delay` now counts/budgets only entries actually removed (a refilled deferred directory that survives `ENOTEMPTY` is not counted; `--max-delete` partial-delete count matches rsync); `--stats` gained the `(reg/dir/link/special)` `Number of files` breakdown and now counts only regular files actually stored for `Number of regular files transferred`/transferred size/literal data (up-to-date re-runs report 0); `Total file size` includes symlink target lengths; `--progress` prints the leading `./` root line and counts it in `to-chk` so a single-file transfer matches rsync; and `%C` uses the selected transfer checksum with `checksum_digest_file` supporting md4/sha1/none, byte-identical to rsync for every algorithm. `--out-format` reclassified ❌ (`%b`/delta-`%c` are protocol-specific). Differential + regression tests added; full suite + ASan + clang-format + cppcheck clean.
|
|
|
|
## Next steps
|
|
1. **Merge PR #284** (`dev` -> `main`) once reviewed (protected branch).
|
|
2. **Deferred security items** (documented, not implemented):
|
|
- Pre-auth config/daemon-auth handshake has no aggregate wall-clock deadline
|
|
(per-message timeout only) — slowloris holds connection slots.
|
|
- Per-source registry fails open when the shared table is full (per-module/global
|
|
caps and host ACLs still apply); consider fail-closed or larger/evicting table.
|
|
- SCRAM-like daemon auth has no TLS channel binding (and is not RFC 5802).
|
|
- `cleanup()` signal handler calls non-async-signal-safe teardown; daemon `umask(0)`.
|
|
- Wire protocol assumes homogeneous word size/endianness (lengths are native
|
|
`size_t`) — document or move to fixed-width framing.
|
|
3. **Out of scope / intentional:** pull (remote source) mode is **not** planned —
|
|
FastSync is push-only; see `RSYNC_COMPAT.md#direction`.
|
|
|
|
## Key facts / commands
|
|
- CI image: `gitea.tap-tap.win/taptap/fastsync-ci:v11` (alias `fastsync-ci:local`).
|
|
- Build/test: `cmake -B build -S . -DSTRICT_WARNINGS=ON && cmake --build build -j$(nproc) && ./build/tests`
|
|
then `python3 -m pytest tests/integration/ -n 4 --dist=load -m "not setpriv"`.
|
|
- Dev shell: `nix-shell` (provides clang-format, cppcheck, pytest-xdist, openssh,
|
|
rsync, iproute2, valgrind, lcov; does not build on entry).
|
|
- Gitea API token: supplied out-of-band via the `TOKEN` environment variable; it is
|
|
intentionally **not** recorded in this file.
|
|
- CI polling: `GET /api/v1/repos/TapTap/FastSync/actions/runs?limit=N`, match `head_sha`,
|
|
then `/actions/runs/<id>/jobs`.
|