From 31ed54dab458cb3c0a6472f3e508ccdc7a9b4d79 Mon Sep 17 00:00:00 2001
From: DanConwayDev <DanConwayDev@protonmail.com>
Date: Tue, 4 Nov 2025 06:36:04 +0000
Subject: moved to flakes

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 FLAKE_MIGRATION_COMPLETE.md | 203 ++++++++++++++++++++++++++++++++++++++++++++
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 create mode 100644 FLAKE_MIGRATION_COMPLETE.md

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+# Flake Migration Complete
+
+**Date:** November 4, 2025  
+**Change:** Migrated from shell.nix to flake.nix
+
+## What Changed
+
+### Files Modified
+
+1. **Created: grasp-audit/flake.nix**
+   - Based on ../ngit/flake.nix
+   - Uses rust-overlay for Rust toolchain
+   - Includes devShell and package outputs
+   - Properly configured with dependencies
+
+2. **Removed: grasp-audit/shell.nix**
+   - Old Nix shell configuration
+   - Replaced by flake.nix
+
+3. **Updated Documentation:**
+   - grasp-audit/README.md
+   - grasp-audit/QUICK_START.md
+   - NEXT_SESSION_QUICKSTART.md
+   - SMOKE_TEST_REPORT.md
+   - FILES_CREATED.md
+
+All references to `nix-shell` changed to `nix develop`.
+
+## New Flake Configuration
+
+```nix
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { nixpkgs, rust-overlay, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs { inherit system overlays; };
+        manifest = pkgs.lib.importTOML ./Cargo.toml;
+      in with pkgs; {
+        devShells.default = mkShell {
+          nativeBuildInputs = [
+            rust-bin.stable.latest.default
+            pkg-config
+            gitlint
+          ];
+          buildInputs = [
+            openssl
+          ];
+          shellHook = ''
+            echo "🦀 GRASP Audit development environment loaded"
+            # ... helpful messages ...
+            export RUST_SRC_PATH=${pkgs.rustPlatform.rustLibSrc}
+          '';
+        };
+        
+        packages.default = pkgs.rustPlatform.buildRustPackage {
+          pname = manifest.package.name;
+          version = manifest.package.version;
+          src = ./.;
+          cargoLock = { lockFile = ./Cargo.lock; };
+          buildInputs = [ openssl ];
+          nativeBuildInputs = [ pkg-config ];
+          doCheck = false;
+        };
+      });
+}
+```
+
+## Flake Validation
+
+```bash
+$ cd grasp-audit && nix flake show
+git+file:///persistent/dcdev/clones/ngit-grasp?dir=grasp-audit
+├───devShells
+│   ├───aarch64-darwin
+│   │   └───default: omitted (use '--all-systems' to show)
+│   ├───aarch64-linux
+│   │   └───default: omitted (use '--all-systems' to show)
+│   ├───x86_64-darwin
+│   │   └───default: omitted (use '--all-systems' to show)
+│   └───x86_64-linux
+│       └───default: development environment 'nix-shell'
+└───packages
+    ├───aarch64-darwin
+    │   └───default: omitted (use '--all-systems' to show)
+    ├───aarch64-linux
+    │   └───default: omitted (use '--all-systems' to show)
+    ├───x86_64-darwin
+    │   └───default: omitted (use '--all-systems' to show)
+    └───x86_64-linux
+        └───default: package 'grasp-audit-0.1.0'
+```
+
+✅ Flake is valid and provides:
+- Dev shell for all major systems
+- Package output for grasp-audit binary
+
+## Usage
+
+### Old Way (shell.nix)
+```bash
+cd grasp-audit
+nix-shell
+cargo build
+```
+
+### New Way (flake.nix)
+```bash
+cd grasp-audit
+nix develop
+cargo build
+```
+
+### Additional Flake Commands
+
+```bash
+# Show flake outputs
+nix flake show
+
+# Check flake validity
+nix flake check
+
+# Build the package directly
+nix build
+
+# Run without installing
+nix run
+
+# Update flake inputs
+nix flake update
+```
+
+## Benefits of Flakes
+
+1. **Reproducibility:** Locked inputs ensure consistent builds
+2. **Multi-output:** Both dev shell and package in one file
+3. **Standard:** Follows modern Nix best practices
+4. **Composability:** Can be used as input to other flakes
+5. **Better UX:** `nix develop` is clearer than `nix-shell`
+
+## Updated Quick Start
+
+```bash
+# 1. Enter dev environment
+cd grasp-audit
+nix develop
+
+# 2. Build
+cargo build
+
+# 3. Test
+cargo test --lib
+
+# 4. Run example
+cargo run --example simple_audit
+```
+
+## Documentation Updates
+
+All documentation has been updated to use `nix develop` instead of `nix-shell`:
+
+- ✅ grasp-audit/README.md
+- ✅ grasp-audit/QUICK_START.md
+- ✅ NEXT_SESSION_QUICKSTART.md
+- ✅ SMOKE_TEST_REPORT.md
+- ✅ FILES_CREATED.md
+
+## Next Steps
+
+The flake is ready to use. Next session can:
+
+1. **Enter dev environment:**
+   ```bash
+   cd grasp-audit
+   nix develop
+   ```
+
+2. **Build and test:**
+   ```bash
+   cargo build
+   cargo test --lib
+   ```
+
+3. **Continue with integration tests** (once relay is set up)
+
+## Status
+
+- ✅ Flake created and validated
+- ✅ Documentation updated
+- ✅ Old shell.nix removed
+- ✅ Git tracking enabled
+- 🚧 Dev environment ready (first run will download dependencies)
+- 🚧 Build pending (waiting for nix develop to complete)
+
+---
+
+**Migration Complete:** shell.nix → flake.nix ✅
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