Extract ICloneableFactoryV4 salt-derivation math into LibICloneableFactoryV4 - #58
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Extract the two ICloneableFactoryV4 effective-CREATE2-salt derivations (namespaced and open-salt) into a pure internal library, importing the domain tags from the interface so the interface and the library cannot drift. Add discriminating + fuzz tests, and update CLAUDE.md/README to record that this repo holds the derivation library and its tests. Closes #57 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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WalkthroughThe PR adds ChangesV4 Salt Derivation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The change is mergeable with owner awareness: two documentation statements should be clarified so repository dependency boundaries and the limits of drift prevention are described accurately; there is no indicated runtime or deployment impact. Possibly related PRs
Suggested labels: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@CLAUDE.md`:
- Around line 60-62: Update the repository import-boundary statement near the
ICloneableFactoryV4/ICloneableFactoryV3 discussion to apply only to production
source imports, explicitly excluding test dependencies such as forge-std. Keep
the intra-repository inheritance example and standalone-publish guidance
unchanged.
In `@README.md`:
- Around line 29-30: Update the README drift-prevention statement to clarify
that importing domain tags from ICloneableFactoryV4.sol provides one source of
truth for the tags, while LibICloneableFactoryV4.sol can still change its
abi.encode formulas independently; state that
test/src/lib/LibICloneableFactoryV4.t.sol verifies byte equality.
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CLAUDE.mdREADME.mdsrc/lib/LibICloneableFactoryV4.soltest/src/lib/LibICloneableFactoryV4.t.sol
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Scope CLAUDE.md's no-external-imports statement to src/ (tests import forge-std), and in README attribute one-source-of-truth to the imported tags while crediting the tests for pinning the formulas byte for byte. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
…ranch Conflicts resolved in CLAUDE.md, README.md and REUSE.toml by taking main's framing — the repo is the interface surface plus the LibICloneableFactoryV4 library — extended to cover the factory logic this branch adds. The lib/test fold onto #58's surface is the next commit. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Ruling (thedavidmeister, 2026-08-20): #58's design wins. Its LibICloneableFactoryV4 — the interface-mirroring lib carrying the two effective-salt derivations — is the shape; this branch's LibCloneFactory must not stand next to it as a parallel second lib. So: LibCloneFactory's duplicate derivations (effectiveSaltNamespaced / effectiveSaltOpen) are deleted in favour of the merged effectiveSalt / effectiveOpenSalt, which stay byte-identical to #58. Everything else — the EIP-1167 creation code and CREATE2 prediction, the implementation-code guard, the atomic clone-initialize-verify flow with its typed errors, and the four ICloneableFactoryV4 entry points — folds into LibICloneableFactoryV4 beneath them, delegating to the merged derivations. The internal salt parameter is renamed derivedSalt so it cannot shadow the effectiveSalt function it now sits beside. The lib's pragma moves ^0.8.18 -> ^0.8.25: the flow emits the interface's NewClone via qualified access (ICloneableFactoryV3.NewClone), which needs solc >= 0.8.21, and this repo's convention is that libraries float ^0.8.25 while interfaces keep ^0.8.18. Tests follow the fold: the merged LibICloneableFactoryV4.t.sol gains the six non-duplicate derivation tests (preimage shape and input sensitivity, renamed to the merged function names); the two LibCloneFactory derivation suites are deleted as duplicates of what #58 already covers; the five machinery/flow suites are renamed LibICloneableFactoryV4.*.t.sol and retargeted, as is the TestCloneFactory pure-delegation harness. 42 tests, 6 suites, fuzz 2048, all green; .gas-snapshot regenerated. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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What
Extracts the two
ICloneableFactoryV4effective-CREATE2-salt derivations intoa pure
internallibrary,src/lib/LibICloneableFactoryV4.sol, so a factory, anindexer, or a consumer predicting a clone address computes them from one place
instead of depending on the deploy concrete or re-deriving the formulas inline.
effectiveSalt(address deployer, bytes32 salt)—keccak256(abi.encode(ICLONEABLE_FACTORY_V4_NAMESPACED_DOMAIN, deployer, salt))effectiveOpenSalt(bytes32 salt, bytes memory data)—keccak256(abi.encode(ICLONEABLE_FACTORY_V4_OPEN_SALT_DOMAIN, salt, keccak256(data)))Both float
^0.8.18like the interfaces and import the two domain tags fromICloneableFactoryV4.sol— one source of truth, so the interface and the librarycannot drift. The library is the executable pin of the NatSpec formulas.
CLAUDE.mdandREADME.mdare corrected: this repo now holds the interfacesurface and the V4 derivation library, and its tests live here.
CLAUDE.mdstays under its 4096-byte cap (4085 bytes).
The consumer follow-on (the deploy concrete importing this library, and the
republish cascade) is out of scope here per the issue.
Closes #57
QA
test/src/lib/LibICloneableFactoryV4.t.sol(pin=0.8.25), fuzzed at 2048 runs over addresses, salts, and data lengths incl. empty; each passes on baseline and fails under the derivation mutations below.mutation-probeover the library — 15 mutants, 14 KILLED, 1 SURVIVED and proven equivalent (M14:abi.encode→abi.encodePackedineffectiveOpenSalt, whose three operands are allbytes32, so the 96-byte preimage is byte-identical — survival across 2048 fuzz runs is the proof, and M06, the same mutation oneffectiveSalt'saddressoperand, was KILLED). No test can or should distinguish it.keccak256(abi.encode(...)), never the library against itself; the domain tags are re-derived from their literal strings (keccak256("rain.factory.clone.namespaced")/...opensalt).(deployer, salt)output collides with any open-salt(salt, data)output.Summary by CodeRabbit
New Features
CREATE2salt derivation for namespaced and open-salt clone deployments.Documentation
Tests