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PointSav Documentation

The engineering library for the PointSav platform — operating systems and services for regulated businesses that own their data, their AI, and their record-keeping outright. Where the monorepo holds the code, this wiki holds the reasoning: architecture, services, security, and the governance commitments that bind future development.

PointSav Digital Systems

Per-user build cache discipline — preventing cross-user Cargo races

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160f29b9 · PointSav Digital Systems ·

editorial(architecture): verify cargo-target-per-user-discipline against real source (Track-B) — confirmed /etc/profile.d/foundry-cargo.sh matches exactly (per-$USER CARGO_TARGET_DIR, precedence over config.toml); added a real detail not previously covered: a 30-min disk-threshold cleanup timer trimming the shared cache above 80% root usage; register-clean EN+ES

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@@ -37,6 +37,8 @@ The migration involved moving the existing 3.3 GiB cache into one user's subdire

Service accounts in the workspace group (local-doorman, local-design, and similar) do not run Cargo and do not receive a per-user cache directory. The profile script only exports when the shared cache root exists, so non-workspace contexts are unaffected.

A timer checks the shared cache's disk usage every 30 minutes and trims it once root filesystem usage passes 80% — per-user partitioning solves the cross-user race, but a growing cache still needs a backstop against filling the disk.

## Generalising beyond Cargo

The lesson generalises: any group-writable shared workspace path needs explicit design around which operations are safe to share (reads, content appends) and which require per-user partition (build state, lock files, temp). Cargo is the prominent example; the same logic applies to anything with mutable state under a shared root.
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