An incremental build cache for Rust on GHA
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Hi HN,I'm Kyle, the creator of Clipper, a container registry with 7x faster builds via lazy pulls and cache mount exports. In the process of implementing cache mount exports I ended up with a FUSE mounted filesystem backed by a remote content defined store. I went looking for fun things to do with it and found that there's not really a good way to keep Rust incremental build state around on ephemeral runners, so here we are.Rust generally uses https://github.com/mozilla/sccache for caching, but sccache disables itself when incremental compilation is enabled (https://github.com/mozilla/sccache/issues/236) and it isn't on Mozilla's roadmap to fix.It unfortunately doesn't really work on stable Rust (which uses mtime to decide when files have changed, rather than file contents), but maybe once https://github.com/rust-lang/cargo/issues/14136 is stable it will be useful to someone.
HN · launched Jul 15, 2026 · 5 upvotes (top 89%) · 1 view
Niche: gpu infrastructure and developer tools · 129 launches, 7 in the last 7 days ▼ -30% · Explore this niche →
Category and tags
- Horizontal
- Dev tools
- Developer
- Not AI
- Commercial product
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More like this: all 129 launches in gpu infrastructure and developer tools →
Could you build this?
No Building a low-latency incremental build cache with a custom FUSE-mounted virtual filesystem backed by a distributed content-addressable storage engine requires deep operating systems and storage systems engineering.
What it would actually take: Architecture requires a Rust-based userspace filesystem utilizing libfuse/fuse3 that intercepts OS-level file reads/writes, calculates chunk-level BLAKE3 or SHA-256 hashes, and communicates with a distributed content-defined chunking (CDC) remote cache. It involves deep understanding of Linux kernel VFS layers, page cache interaction, and GitHub Actions runner environments to achieve lazy streaming without locking compiler toolchains. Deep expertise in systems programming, file systems, and distributed storage protocols is essential.
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Competitors
Other products that read as similar to this one : 304 launches clear the similarity bar, closest 8 shown.
Attention rank: #280 of 305 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 254 days after the earliest competitor.
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