Coalesce sparse zero runs across chunks#2139
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oferchen
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May 14, 2026
Mirrors upstream rsync 3.4.1 behaviour at checksum.c:197-198 where parse_checksum_choice unconditionally sets whole_file = 1 when the negotiated transfer checksum is CSUM_NONE. The delta algorithm cannot run without a transfer checksum, so whole-file transfer is the only valid mode. Changes: - Add StrongChecksumAlgorithm::None and accept `none` (case-insensitive) via --checksum-choice/--cc, forwarding it to the remote peer. - ClientConfigBuilder::build now promotes whole_file to Some(true) whenever checksum_choice.transfer_is_none(); explicit --no-whole-file is silently overridden (matching upstream's unconditional assignment). - Regression tests at the builder layer (checksum_choice_none_promotes_whole_file, checksum_choice_none_overrides_explicit_no_whole_file) and at the CLI parser layer (test_checksum_choice_none_parses, _via_cc_alias). - Refresh the mutual-exclusion audit matrix and oc-rsync(1) man page so `none` is documented; mark G1 RESOLVED. Closes #2139, #2140, #2141.
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Summary
SparseWriteStatehelper that tracks pending zero spans so sparse writes coalesce contiguous holes instead of seeking per bufferTesting
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