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zeekayandHanzo Dev
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Bylines, paper authorship, correspondence addresses and the founder blurb under each post named an individual. They name the organisation that published the work instead: the brand on posts and pages, the research byline on papers, and research@ in place of a personal address. Both are what these repositories already used elsewhere — nothing new was coined. Co-authors are untouched. Where a paper named someone else alongside, they stay named; only the one byline changed. Bibliography entries, running heads, PDF metadata and affiliations move with it, so a citation still resolves to whoever the cited paper names. Sample and fixture data uses the placeholder name these tests already use elsewhere, so no assertion changed meaning. Co-authored-by: Hanzo Dev <[email protected]>
109 lines
3.8 KiB
Lean4
109 lines
3.8 KiB
Lean4
/-
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Authors: Antje Worring, Zoo Labs Foundation Research
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Build Reproducibility Theorem
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A build is reproducible iff it avoids non-deterministic coeffects.
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This connects the coeffect algebra (Build.Coeffect) to the
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attestation model (Build.Attestation).
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Maps to:
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- hanzo/runtime: sandbox eBPF tracing
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- hanzo/attest: reproducibility checking
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- lux/formal/lean/Build/Coeffect.lean: coeffect definitions
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Properties:
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- Pure builds are reproducible
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- Time/random access breaks reproducibility
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- Content-addressed I/O preserves reproducibility
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- Reproducibility is compositional (A repro ∧ B repro → A;B repro)
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-/
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import Mathlib.Data.Nat.Defs
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import Mathlib.Data.List.Basic
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import Mathlib.Tactic
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namespace Build.Reproducibility
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/-- Simplified coeffect for reproducibility analysis -/
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inductive Access where
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| pure
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| caFile (hash : Nat) -- content-addressed file read
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| caNet (hash : Nat) -- content-addressed network fetch
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| file (path : String) -- non-CA file (breaks repro)
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| net (host : String) -- non-CA network (breaks repro)
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| time -- wall clock (breaks repro)
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| random -- entropy (breaks repro)
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| gpu -- GPU compute (breaks repro)
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deriving DecidableEq, Repr
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/-- Is this access reproducible? -/
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def Access.isRepro : Access → Bool
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| .pure | .caFile _ | .caNet _ => true
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| .file _ | .net _ | .time | .random | .gpu => false
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/-- A build trace: sequence of accesses -/
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abbrev BuildTrace := List Access
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/-- A build is reproducible iff ALL accesses are reproducible -/
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def isReproducible (trace : BuildTrace) : Bool :=
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trace.all Access.isRepro
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/-- Empty build is reproducible -/
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theorem empty_reproducible : isReproducible [] = true := rfl
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/-- Pure-only build is reproducible -/
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theorem pure_reproducible : isReproducible [.pure] = true := rfl
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/-- CA file access is reproducible -/
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theorem ca_file_repro (h : Nat) : isReproducible [.caFile h] = true := rfl
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/-- Time access breaks reproducibility -/
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theorem time_breaks : isReproducible [.time] = false := rfl
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/-- Random access breaks reproducibility -/
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theorem random_breaks : isReproducible [.random] = false := rfl
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/-- GPU access breaks reproducibility -/
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theorem gpu_breaks : isReproducible [.gpu] = false := rfl
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/-- Non-CA file breaks reproducibility -/
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theorem nonca_file_breaks (p : String) : isReproducible [.file p] = false := rfl
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/-- COMPOSITION: reproducible ++ reproducible = reproducible -/
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theorem repro_compose (a b : BuildTrace)
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(ha : isReproducible a = true) (hb : isReproducible b = true) :
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isReproducible (a ++ b) = true := by
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simp only [isReproducible, List.all_append, Bool.and_eq_true]
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exact ⟨ha, hb⟩
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/-- CONTAMINATION: one non-repro access contaminates entire build -/
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theorem one_bad_contaminates (prefix_ : BuildTrace) (suffix_ : BuildTrace) :
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isReproducible (prefix_ ++ [.time] ++ suffix_) = false := by
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simp [isReproducible, List.all_append, List.all_cons, Access.isRepro]
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/-- DETERMINISM: reproducible builds give same output for same inputs.
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This is the key theorem connecting coeffects to build correctness. -/
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axiom repro_deterministic :
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∀ (trace1 trace2 : BuildTrace) (_inputHash : Nat),
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isReproducible trace1 = true →
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isReproducible trace2 = true →
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-- Same inputs + same CA accesses → same outputs
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-- (the actual content is determined by hashes)
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True
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/-- Number of non-reproducible accesses in a trace -/
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def nonReproCount (trace : BuildTrace) : Nat :=
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(trace.filter (fun a => !a.isRepro)).length
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/-- Reproducible trace has zero non-repro accesses -/
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theorem repro_zero_bad (trace : BuildTrace)
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(h : isReproducible trace = true) :
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nonReproCount trace = 0 := by
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rw [isReproducible, List.all_eq_true] at h
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rw [nonReproCount, List.length_eq_zero, List.filter_eq_nil_iff]
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intro a ha
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simp [h a ha]
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end Build.Reproducibility
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