# USDA Vision - Flake Migration Complete ✅

## Summary

Your USDA Vision repository now has:

1. **Self-contained Nix flake** (`flake.nix`)
   - Independent build system
   - Development environment
   - NixOS module for deployment

2. **Encrypted secrets management** (ragenix)
   - `.age` files safe to commit to git
   - Key-based access control
   - No more plaintext `.env` files

3. **Modular build** (package.nix, camera-sdk.nix)
   - Cleaner organization
   - Easier to maintain
   - Reusable components

4. **Updated parent** (../default.nix)
   - Now references the flake
   - Removed 200+ lines of inline derivations

## Files Added

### Core Flake Files
- ✅ `flake.nix` - Main flake definition with outputs
- ✅ `package.nix` - Application build logic  
- ✅ `camera-sdk.nix` - Camera SDK build logic
- ✅ `secrets.nix` - ragenix configuration

### Secrets Infrastructure
- ✅ `secrets/secrets.nix` - Public key list
- ✅ `secrets/README.md` - Secrets documentation
- ✅ `secrets/.gitignore` - Protect plaintext files

### Documentation & Helpers
- ✅ `FLAKE_SETUP.md` - Complete setup guide
- ✅ `setup-dev.sh` - Interactive setup script
- ✅ `.envrc` - direnv integration (optional)

### Parent Directory
- ✅ `NIX_FLAKE_MIGRATION.md` - Migration summary

## Next Steps

### 1. Commit the Flake Files

The flake needs to be in git to work:

```bash
cd /home/engr-ugaif/usda-dash-config/usda-vision

# Add all new flake files
git add flake.nix package.nix camera-sdk.nix secrets.nix
git add secrets/secrets.nix secrets/README.md secrets/.gitignore
git add FLAKE_SETUP.md setup-dev.sh .envrc .gitignore

# Commit
git commit -m "Add Nix flake with ragenix secrets management

- Self-contained flake build system
- Development shell with all tools
- ragenix for encrypted secrets
- Modular package definitions
"
```

### 2. Set Up Your Age Key

```bash
cd /home/engr-ugaif/usda-dash-config/usda-vision

# Option A: Use the interactive setup script
./setup-dev.sh

# Option B: Manual setup
mkdir -p ~/.config/age
age-keygen -o ~/.config/age/keys.txt
# Then add your public key to secrets/secrets.nix
```

### 3. Encrypt Your Secrets

```bash
# Enter the development environment
nix develop

# Encrypt main .env file
ragenix -e secrets/env.age
# Paste your current .env contents, save, exit

# Encrypt Azure config
ragenix -e secrets/env.azure.age  
# Paste your current .env.azure contents, save, exit

# Commit encrypted secrets
git add secrets/env.age secrets/env.azure.age
git commit -m "Add encrypted environment configuration"
```

### 4. Test the Setup

```bash
# Test that the build works
nix build

# Test the development shell
nix develop
# You should see a welcome message

# Inside the dev shell, verify tools
docker-compose --version
supabase --version
ragenix --help
```

### 5. Update the Parent Repository

```bash
cd /home/engr-ugaif/usda-dash-config

# Commit the updated default.nix
git add default.nix NIX_FLAKE_MIGRATION.md
git commit -m "Update default.nix to use usda-vision flake

- Removed inline derivations
- Now references usda-vision flake packages
- Cleaner, more maintainable code
"
```

### 6. Clean Up Old Files (Optional)

After verifying everything works, you can delete the old plaintext secrets:

```bash
cd /home/engr-ugaif/usda-dash-config/usda-vision

# These are already git-ignored, but remove them locally
rm -f .env .env.azure management-dashboard-web-app/.env

echo "✅ Old plaintext secrets removed"
```

## Verification Checklist

- [ ] Flake files committed to git
- [ ] Age key generated at `~/.config/age/keys.txt`
- [ ] Public key added to `secrets/secrets.nix`
- [ ] Secrets encrypted and committed
- [ ] `nix build` succeeds
- [ ] `nix develop` works
- [ ] Parent `default.nix` updated and committed
- [ ] Old `.env` files deleted

## Usage Quick Reference

### Development

```bash
# Enter dev environment (one-time per session)
cd usda-vision
nix develop

# Edit secrets
ragenix -e secrets/env.age

# Normal docker-compose workflow
docker-compose up -d
docker-compose logs -f
```

### Building

```bash
# Build everything
nix build

# Build specific packages
nix build .#usda-vision
nix build .#camera-sdk
```

### Secrets Management

```bash
# Edit encrypted secret
ragenix -e secrets/env.age

# Re-key after adding a new public key
ragenix -r

# View decrypted (careful!)
age -d -i ~/.config/age/keys.txt secrets/env.age
```

## Troubleshooting

### "cannot decrypt: no valid identity"

Your age key isn't configured. Run:
```bash
./setup-dev.sh
```

### "error: flake.nix is not in git"

Commit the flake files:
```bash
git add flake.nix package.nix camera-sdk.nix secrets.nix
git commit -m "Add flake files"
```

### "experimental feature 'flakes' not enabled"

Add to `~/.config/nix/nix.conf`:
```
experimental-features = nix-command flakes
```

## Documentation

- **Full Setup Guide**: [FLAKE_SETUP.md](FLAKE_SETUP.md)
- **Secrets Guide**: [secrets/README.md](secrets/README.md)
- **Migration Summary**: [../NIX_FLAKE_MIGRATION.md](../NIX_FLAKE_MIGRATION.md)

## Questions?

Refer to [FLAKE_SETUP.md](FLAKE_SETUP.md) for detailed documentation, or run:

```bash
./setup-dev.sh  # Interactive setup
```

---

**Migration completed on**: 2026-01-30
**Created by**: GitHub Copilot