The Audit Before the Commit: Upstreaming a GPU Proving Engine into Production

In the final stretch of a months-long engineering effort to build a high-performance, memory-efficient GPU proving engine for Filecoin's proof-of-replication (PoRep) protocol, the team faced a deceptively simple but critical task: getting the code into the repository in a way that actually works from a fresh clone. The message at [msg 3536] captures the very first step of that upstreaming process—a comprehensive audit of what files are tracked, untracked, and blocked by .gitignore. It is a single bash command, but it represents the transition from implementation to integration, from development sandbox to production readiness.

The Message

The assistant writes:

Let me do a comprehensive audit of what's tracked, what's untracked, and what's blocked by .gitignore:

>

``bash cd /home/theuser/curio && git status --porcelain extern/bellperson/ extern/bellpepper-core/ extern/supraseal-c2/ extern/cuzk/ lib/cuzk/ lib/ffi/cuzk_funcs.go 2>&1 ?? extern/bellpepper-core/.cargo-ok ?? extern/bellpepper-core/.cargo_vcs_info.json ?? extern/bellpepper-core/Cargo.toml ?? extern/bellpepper-core/Cargo.toml.orig ?? extern/bellpepper-core/LICENSE-APACHE ?? extern/bellpepper-core/LICENSE-MIT ?? extern/bellpepper-core/README.md ?? extern/bellpepper-core/benches/ ?? extern/bellpepper-core/src/constraint_system.rs ?? extern/bellpepper-core/src/gadgets/mod.rs ?? extern/bellpepper-core/src/lib.rs ?? extern/bellpepper-core/src/util_cs/ ?? extern/supras... ``

The output is truncated in the conversation record, but the assistant received the full listing. The ?? prefix in git status --porcelain indicates untracked files—files that exist on disk but are not yet staged or committed. The command targeted six specific paths: the vendored Rust crates (bellperson, bellpepper-core, supraseal-c2), the cuzk workspace itself (extern/cuzk/), the Go gRPC client (lib/cuzk/), and the Go FFI bridge (lib/ffi/cuzk_funcs.go).

Why This Message Was Written

The immediate trigger was the user's instruction at [msg 3533]: "Add all cuzk code such that git clone -> make curio cuzk; builds both correctly from a fresh clone. Add docs to documentation/ (Experimental section of the gitbook)." This is a production-hardening requirement. Throughout the development process, the team had been working with files that existed on disk but were not yet committed to git. Some of these files—like Cargo.toml, build.rs, license files, and benchmarks—are essential for a working build but had been left untracked because the original approach only committed the source code diffs from upstream forks.

The user's request raises the stakes from "it works on my machine" to "it works from a clean clone." This is a fundamentally different standard. A fresh clone has no build artifacts, no cached cargo registries, no pre-downloaded dependencies, and no locally patched crates. Every file required for the build must be present in the repository, correctly structured, and referenced by the build system. The .gitignore must not inadvertently exclude critical files like Cargo.lock or static libraries. The Makefile targets must resolve correctly without relying on state left over from previous development sessions.

The assistant's response—running a comprehensive git status audit—is the logical first step. Before you can fix what's missing, you must know what's missing. This is the engineering equivalent of taking inventory before placing an order.

The Context: What Is Being Upstreamed?

To understand why this audit matters, one must appreciate what the cuzk proving engine represents. As documented in the session's earlier segments, the team had spent weeks designing and implementing a GPU-accelerated Groth16 proof generation pipeline for Filecoin's SUPRASEAL_C2 protocol. The original implementation consumed approximately 200 GiB of peak memory and suffered from nine structural bottlenecks, including redundant SRS (Structured Reference String) loading, sequential partition processing that prevented memory reuse, and poor GPU utilization due to CPU-side synchronization delays.

The cuzk engine addressed these problems through three major architectural innovations: Sequential Partition Synthesis, which streams partitions one at a time to reduce peak memory; a Persistent Prover Daemon architecture that keeps the GPU context alive across proof generations, eliminating SRS reload overhead; and a split API design that decouples GPU-critical paths from CPU post-processing to hide latency. The implementation spanned Rust crates with CUDA kernels, Go gRPC clients, and modifications to Curio's task orchestrator for PoRep, SnapDeals, and proofshare workflows.

All of this code needed to be vendored into the Curio repository. The team had chosen Option B—vendoring forked Rust crates directly inside the repository—rather than pushing branches to external GitHub repositories. This decision ensured a self-contained, reproducible build that did not depend on upstream coordination or external branch availability. But it also meant that every file from those forked crates had to be tracked in git, including metadata files, license files, and build configuration that the original minimal tracking had omitted.

Assumptions and Implicit Knowledge

The assistant's audit makes several assumptions. First, it assumes that the six targeted paths are the complete set of directories requiring attention. This is a reasonable assumption given the development history—these are the paths that were modified or created during the cuzk implementation. However, it implicitly assumes that no other parts of the repository (such as modified Go source files in cmd/curio/tasks/ or tasks/seal/) need similar auditing. Those files were already tracked (they showed as modified, not untracked, in earlier git status output), so the assistant correctly focuses only on untracked content.

Second, the assistant assumes that git status --porcelain is the right diagnostic tool. This is correct: --porcelain produces a stable, machine-parseable output format that is immune to configuration changes in git status display settings. The 2>&1 redirect captures any error messages (e.g., if a path doesn't exist) into the same output stream, ensuring nothing is missed.

Third, the assistant assumes that the .gitignore file could be blocking necessary files. This is a subtle but important concern. The Curio repository's .gitignore (visible in [msg 3507]) includes patterns like **/*.a (which would block static library files) and **/*.pc (which would block pkg-config files). If any vendored crate produced or required such files, they would be invisible to git status—not even appearing as untracked. The assistant's phrasing "what's blocked by .gitignore" shows awareness of this silent exclusion problem.

The Thinking Process Visible in the Message

The assistant's reasoning is visible in the structure of the command itself. Note the careful selection of paths: extern/bellperson/ is included even though it was already fully tracked—the assistant is verifying that assumption rather than taking it for granted. The inclusion of lib/ffi/cuzk_funcs.go as a specific file path (rather than a directory) suggests the assistant already knows this file exists and wants to confirm its tracking status explicitly.

The choice of git status --porcelain over the more common git status is deliberate. The --porcelain format gives a clean, script-friendly output that makes it easy to spot untracked files (prefixed with ??) versus modified files (prefixed with M or M ). This is the format used by automation scripts, and its use here signals that the assistant is thinking ahead to the staging and commit steps.

The output itself reveals a pattern: the bellpepper-core directory has many untracked files spanning metadata (.cargo-ok, .cargo_vcs_info.json), build configuration (Cargo.toml, Cargo.toml.orig), licensing (LICENSE-APACHE, LICENSE-MIT), documentation (README.md), benchmarks (benches/), and source code (src/constraint_system.rs, src/gadgets/mod.rs, src/lib.rs, src/util_cs/). This tells the assistant that the original tracking was minimal—only a subset of source files were committed—and the rest need to be added for a complete vendored crate.

Output Knowledge Created by This Message

This message produces concrete, actionable knowledge. Before the audit, the team knew that some files were untracked but did not have a complete inventory. After the audit, they know:

  1. extern/bellperson/ appears to be fully tracked (no ?? entries in the output for that path).
  2. extern/bellpepper-core/ has at least 14 untracked items spanning metadata, build configuration, licensing, documentation, benchmarks, and source files.
  3. extern/supraseal-c2/ also has untracked files (the truncated output shows ?? extern/supras...).
  4. extern/cuzk/, lib/cuzk/, and lib/ffi/cuzk_funcs.go have no untracked entries visible in the truncated output, suggesting they are either fully tracked or empty. This inventory directly feeds into the next steps: staging all untracked files, verifying that .gitignore doesn't silently block anything critical, and then building from scratch to confirm the process works.

Potential Mistakes and Limitations

The most significant limitation of this audit is that git status --porcelain only shows files that are visible to git. Files matching patterns in .gitignore are completely invisible—they don't appear as untracked, they don't appear at all. The assistant explicitly acknowledges this concern ("what's blocked by .gitignore") but the command itself does not check for ignored files. A more thorough audit would use git status --porcelain --ignored to reveal files that are being ignored, or git check-ignore to test specific paths.

Additionally, the audit only checks the six specified paths. If any cuzk-related files exist outside these paths (for example, generated configuration files, test fixtures, or documentation stubs), they would be missed. The assistant's earlier exploration in [msg 3504] showed a much broader set of untracked files including development artifacts (.claude/, AGENTS.md, CLAUDE.md, various analysis documents), but those are correctly excluded as non-essential for the build.

The truncated output is also a practical limitation. The conversation record cuts off at ?? extern/supras..., meaning the full listing for supraseal-c2 is not visible in the captured message. The assistant, of course, saw the complete output in its terminal, but anyone reviewing the conversation later cannot see the full picture without reading subsequent messages.

The Broader Significance

This message, for all its apparent simplicity, represents a critical transition point in the software development lifecycle. The cuzk proving engine had been prototyped, iterated, benchmarked, and optimized across dozens of sessions spanning weeks of work. But none of that effort matters if the code cannot be reliably built and deployed by someone running git clone on a fresh machine. The audit at [msg 3536] is the first step in closing that gap—moving from "it works on the developer's machine" to "it works in production."

The assistant's methodical approach—audit first, then act—reflects a mature engineering discipline. Rather than blindly staging all untracked files or assuming the existing tracking is sufficient, the assistant takes inventory. This is the same principle that underlies the entire cuzk project: measure before optimizing, understand before changing. The same mindset that led to the nine-bottleneck analysis of the original SUPRASEAL_C2 pipeline now manifests in the mundane but essential work of getting the code into git correctly.

In the messages that follow this audit, the assistant will go on to fix .gitignore exclusions, stage all necessary files, verify the build, write documentation, and create the final commit. But it all starts here, with a single git status command and the quiet satisfaction of knowing exactly what needs to be done.