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feat(codecs): per-codec level defaults, RSYNC_*_LIST auto, zlibx reclassify

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- rsync 3.4.1 per-codec defaults (zstd 3, zlib/zlibx 6, lz4 level ignored)
  and per-codec clamping; explicit --zl still wins
- auto resolves via whitespace-separated RSYNC_COMPRESS_LIST /
  RSYNC_CHECKSUM_LIST (first supported wins; all-unknown exits 4)
- zlibx reclassified: FastSync's zlib stream already excludes matched data,
  so its tree/stdout/exit match zlib
- --compress/-z and --compress-choice flip to parity (113/12/32)
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TapTap
2026-09-19 13:14:48 +02:00
parent c80098623f
commit eff9852038
17 changed files with 686 additions and 25 deletions
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README.md
+8 -5
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@@ -117,9 +117,12 @@ matrix is classified as parity, caveat, or divergent in
per-type `Number of files` breakdown is not reproduced. `--progress` prints
rsync-style per-file blocks (without rsync's leading `./` line).
- Codecs match rsync 3.4.1: `zstd`/`lz4`/`zlib`/`zlibx` compression and
`xxh128`/`xxh3`/`xxh64`/`md5`/`md4`/`sha1`/`none` checksums, negotiated with
`auto`; `zlibx` behaves as `zlib`, and the transfer checksum is not separately
selectable.
`xxh128`/`xxh3`/`xxh64`/`md5`/`md4`/`sha1`/`none` checksums. `auto` honors
`RSYNC_COMPRESS_LIST`/`RSYNC_CHECKSUM_LIST` and otherwise follows rsync's
compiled-in order. An omitted `--compress-level` uses the codec's rsync
default (zstd 3, zlib/zlibx 6, lz4 ignored); `zlib`/`zlibx` share the
literal-only zlib path (rsync's zlibx semantics), and the transfer checksum is
not separately selectable.
The detailed flag matrix is maintained in
[`RSYNC_COMPAT.md`](RSYNC_COMPAT.md). It reports each row as **parity**,
@@ -505,8 +508,8 @@ features without changing the meaning of ordinary compatibility options.
|---|---|
| `-j`, `--threads[=N]` | Enable the multithreaded scanner/loader/sender pipeline. `N` (1–256) sets the parallel scanner worker count; bare `-j`/`--threads` uses the default. |
| `-z [level]`, `--compress [level]` | Enable streaming compression (default `zstd`), levels 1-22. |
| `--compress-level <n>` | Set the compression level. |
| `--zc <alg>` | Alias for `--compress-choice`. FastSync supports `zstd` (default), `lz4`, `zlib`, `zlibx`, `none`, and `auto`; `zlibx` behaves as `zlib`. |
| `--compress-level <n>` | Set the compression level (1-22). Omitted, each codec uses its rsync default: zstd 3, zlib/zlibx 6, lz4 ignored. |
| `--zc <alg>` | Alias for `--compress-choice`. FastSync supports `zstd` (default), `lz4`, `zlib`, `zlibx`, `none`, and `auto`; `zlib`/`zlibx` share the same literal-only zlib path. |
| `--zl <n>` | Alias for `--compress-level`. |
| `--skip-compress <list>` | Skip compression for `/`- or `,`-separated suffixes; defaults to rsync 3.4.1's built-in list. Incompatible with `--chunk-serialization`. |
| `--compress-threads <n>` | Use `n` zstd compression workers. Requires compression and a zstd build with threaded support; the setting affects sender CPU work only. |