Hermetic Build Patterns

Evaluation-phase purity breaks when builds reshape the dependency graph mid-pipeline.

Declared inputs make distributed builds reproducible across architectures.

Closing every route for undeclared dependencies to affect Nix builds.

Detect nondeterministic Nix builds by comparing outputs with content-aware diffing.

Hermetic builds turn compliance evidence into a build artifact rather than paperwork.

Nix's fixed-output derivations gate network access with cryptographic hashes.

Developers can now build with Nix in CI without pre-installing it globally.

Nix's network isolation ensures builds can't fetch undeclared dependencies.