+devshell structure

README.md

@@ -6,6 +6,7 @@ My personal Nix repository containing custom packages, overlays, NixOS modules,
 
 - 🎁 **Custom Packages**: Collection of personal Nix packages
 - 🔄 **Overlays**: Package modifications and enhancements
+- 🐚 **Development Shells**: Pre-configured environments for Python and DevOps
 - ⚙️ **NixOS Modules**: System-level configuration modules
 - 🏠 **Home Manager Modules**: User-level configuration modules
 - 📚 **Library Functions**: Helper utilities for configuration management
@@ -25,6 +26,10 @@ m3ta-nixpkgs/
 │   ├── pomodoro-timer/
 │   ├── tuxedo-backlight/
 │   └── zellij-ps/
+├── shells/                      # Development shells
+│   ├── default.nix             # Shell registry (default, python, devops)
+│   ├── python.nix              # Python development environment
+│   └── devops.nix              # DevOps/infrastructure tools
 ├── overlays/                    # Overlays
 │   ├── default.nix
 │   └── mods/                   # Package modifications
@@ -43,7 +48,7 @@ m3ta-nixpkgs/
 │   └── ports.nix               # Port management utilities
 ├── examples/                    # Usage examples
 │   ├── home-manager-standalone.nix
-│   └── nixos-configuration.nix
+│   ├── nixos-configuration.nix
 └── templates/                   # Templates for new packages/modules
 ```
 
@@ -160,6 +165,112 @@ nix profile install git+https://code.m3ta.dev/m3tam3re/nixpkgs#msty-studio
 nix flake show git+https://code.m3ta.dev/m3tam3re/nixpkgs
 ```
 
+## Development Shells
+
+This repository provides pre-configured development environments. All shells are accessible via `nix develop`.
+
+### Available Shells
+
+| Shell     | Description                                    | Usage                  |
+| --------- | ---------------------------------------------- | ---------------------- |
+| `default` | Nix development tools for working on this repo | `nix develop`          |
+| `python`  | Python with common libraries and tools         | `nix develop .#python` |
+| `devops`  | Docker, Kubernetes, Terraform, cloud CLIs      | `nix develop .#devops` |
+
+### Quick Start
+
+```bash
+# Enter a development environment
+nix develop git+https://code.m3ta.dev/m3tam3re/nixpkgs#python
+nix develop git+https://code.m3ta.dev/m3tam3re/nixpkgs#devops
+
+# Run a command in a shell without entering it
+nix develop git+https://code.m3ta.dev/m3tam3re/nixpkgs#python --command python --version
+```
+
+### Using Shells in Home Manager
+
+Add shells to your home-manager configuration for persistent access:
+
+```nix
+{
+  inputs.m3ta-nixpkgs.url = "git+https://code.m3ta.dev/m3tam3re/nixpkgs";
+
+  # Make tools globally available
+  home.packages = with inputs.m3ta-nixpkgs.devShells.${pkgs.system};
+    python.buildInputs ++ devops.buildInputs;
+
+  # Or create aliases
+  programs.zsh.shellAliases = {
+    dev-python = "nix develop ${inputs.m3ta-nixpkgs}#python";
+    dev-devops = "nix develop ${inputs.m3ta-nixpkgs}#devops";
+  };
+}
+```
+
+### Using Shells in NixOS
+
+Add shells system-wide:
+
+```nix
+{
+  inputs.m3ta-nixpkgs.url = "git+https://code.m3ta.dev/m3tam3re/nixpkgs";
+
+  # Make tools available to all users
+  environment.systemPackages =
+    inputs.m3ta-nixpkgs.devShells.${pkgs.system}.python.buildInputs;
+
+  # System-wide aliases
+  environment.shellAliases = {
+    dev-python = "nix develop ${inputs.m3ta-nixpkgs}#python";
+  };
+}
+```
+
+### Project-Specific Usage with direnv
+
+Create `.envrc` in your project directory:
+
+```bash
+use flake git+https://code.m3ta.dev/m3tam3re/nixpkgs#python
+```
+
+Then run `direnv allow`. The environment activates automatically when you enter the directory!
+
+### Extending Shells for Your Project
+
+Create a `flake.nix` in your project that extends a base shell:
+
+```nix
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    m3ta-nixpkgs.url = "git+https://code.m3ta.dev/m3tam3re/nixpkgs";
+  };
+
+  outputs = { nixpkgs, m3ta-nixpkgs, ... }: {
+    devShells.x86_64-linux.default = nixpkgs.legacyPackages.x86_64-linux.mkShell {
+      # Inherit all packages from base Python shell
+      inputsFrom = [ m3ta-nixpkgs.devShells.x86_64-linux.python ];
+
+      # Add project-specific packages
+      buildInputs = [ nixpkgs.legacyPackages.x86_64-linux.postgresql ];
+
+      # Project-specific environment variables
+      DATABASE_URL = "postgresql://localhost/mydb";
+    };
+  };
+}
+```
+
+### Shell Details
+
+See individual shell files for detailed package lists and configuration:
+
+- **Default Shell**: `shells/default.nix` - Nix development tools
+- **Python Shell**: `shells/python.nix` - Python development environment
+- **DevOps Shell**: `shells/devops.nix` - Infrastructure and cloud tools
+
 ## Development
 
 ### Setting Up Development Environment

flake.nix

@@ -75,27 +75,14 @@
         import ./lib {lib = pkgs.lib;}
     );
 
-    # Development shell for working on this repository
+    # Development shells for various programming environments
+    # Usage: nix develop .#<shell-name>
+    # Available shells: default, rust, python, nodejs, go, cpp, web, devops, data-science
     devShells = forAllSystems (
       system: let
         pkgs = pkgsFor system;
-      in {
+      in
-        default = pkgs.mkShell {
+        import ./shells {inherit pkgs;}
-          buildInputs = with pkgs; [
-            nil # Nix LSP
-            nixpkgs-fmt # Nix formatter
-            nix-tree # Explore dependency trees
-          ];
-
-          shellHook = ''
-            echo "🚀 m3ta-nixpkgs development environment"
-            echo "Available commands:"
-            echo "  nix flake check    - Check flake validity"
-            echo "  nix flake show     - Show flake outputs"
-            echo "  nix build .#<pkg>  - Build a package"
-          '';
-        };
-      }
     );
 
     # Formatter for 'nix fmt'

shells/default.nix

@@ -0,0 +1,36 @@
+# Development shells for various programming environments
+# Each shell can be accessed via: nix develop .#<shell-name>
+# Or used in home-manager/system configs
+{pkgs}: {
+  # Default shell for working on this repository
+  default = pkgs.mkShell {
+    name = "m3ta-nixpkgs-dev";
+
+    buildInputs = with pkgs; [
+      nil # Nix LSP
+      nixpkgs-fmt # Nix formatter
+      nix-tree # Explore dependency trees
+      statix # Nix linter
+      deadnix # Find dead Nix code
+    ];
+
+    shellHook = ''
+      echo "🚀 m3ta-nixpkgs development environment"
+      echo "Available commands:"
+      echo "  nix flake check    - Check flake validity"
+      echo "  nix flake show     - Show flake outputs"
+      echo "  nix build .#<pkg>  - Build a package"
+      echo "  nixpkgs-fmt .      - Format Nix files"
+      echo "  statix check .     - Lint Nix files"
+      echo "  deadnix .          - Find dead code"
+    '';
+  };
+
+  # Import all individual shell environments
+  rust = import ./rust.nix {inherit pkgs;};
+  python = import ./python.nix {inherit pkgs;};
+  nodejs = import ./nodejs.nix {inherit pkgs;};
+  go = import ./go.nix {inherit pkgs;};
+  web = import ./web.nix {inherit pkgs;};
+  devops = import ./devops.nix {inherit pkgs;};
+}

shells/devops.nix

@@ -0,0 +1,144 @@
+# DevOps development environment
+# Usage: nix develop .#devops
+{pkgs}:
+pkgs.mkShell {
+  name = "devops-dev";
+
+  buildInputs = with pkgs; [
+    # Container tools
+    docker
+    docker-compose
+    podman
+    buildah
+    skopeo
+    dive # Docker image explorer
+
+    # Kubernetes tools
+    kubectl
+    kubectx # Includes kubens
+    k9s # TUI for Kubernetes
+    kubernetes-helm
+    helmfile
+    kustomize
+    stern # Multi-pod log tailing
+    kubeseal # Sealed secrets
+
+    # Infrastructure as Code
+    terraform
+    opentofu # Open-source Terraform fork
+    terragrunt
+    terraform-docs
+    tflint
+    infracost # Cost estimates for Terraform
+
+    # Configuration management
+    ansible
+    ansible-lint
+
+    # CI/CD tools
+    github-cli
+    gitlab-runner
+    act # Run GitHub Actions locally
+
+    # Cloud CLIs
+    awscli2
+    google-cloud-sdk
+    azure-cli
+    doctl # DigitalOcean CLI
+
+    # Monitoring and observability
+    prometheus
+    grafana
+    # Note: promtool is included in prometheus package
+
+    # Service mesh
+    istioctl
+    linkerd
+
+    # Security and secrets
+    vault
+    sops
+    age # Encryption tool
+    trivy # Security scanner
+
+    # Scripting and automation
+    python3
+    jq
+    yq-go
+    jo # JSON output from shell
+
+    # Network tools
+    curl
+    wget
+    httpie
+    netcat
+    nmap
+    tcpdump
+    wireshark-cli
+
+    # System utilities
+    htop
+    btop
+    lsof
+    tmux
+    git
+    gnumake
+
+    # Linters and formatters
+    shellcheck
+    shfmt
+    yamllint
+  ];
+
+  # Environment variables
+  DOCKER_BUILDKIT = "1";
+  COMPOSE_DOCKER_CLI_BUILD = "1";
+
+  shellHook = ''
+    echo "🚀 DevOps Development Environment"
+    echo ""
+    echo "Container tools:"
+    echo "  docker / podman           - Container runtime"
+    echo "  docker-compose            - Multi-container applications"
+    echo "  dive                      - Explore Docker images"
+    echo "  buildah / skopeo          - Build and manage containers"
+    echo ""
+    echo "Kubernetes:"
+    echo "  kubectl                   - Kubernetes CLI"
+    echo "  k9s                       - Kubernetes TUI"
+    echo "  helm                      - Package manager"
+    echo "  kubectx / kubens          - Switch contexts/namespaces (kubens included in kubectx)"
+    echo "  stern <pod>               - Multi-pod logs"
+    echo ""
+    echo "Infrastructure as Code:"
+    echo "  terraform / opentofu      - Infrastructure provisioning"
+    echo "  terragrunt                - Terraform wrapper"
+    echo "  ansible                   - Configuration management"
+    echo "  tflint                    - Terraform linter"
+    echo ""
+    echo "Cloud CLIs:"
+    echo "  aws                       - AWS CLI"
+    echo "  gcloud                    - Google Cloud CLI"
+    echo "  az                        - Azure CLI"
+    echo "  doctl                     - DigitalOcean CLI"
+    echo ""
+    echo "Security & Secrets:"
+    echo "  vault                     - HashiCorp Vault"
+    echo "  sops                      - Secrets management"
+    echo "  trivy                     - Security scanner"
+    echo "  kubeseal                  - Sealed secrets"
+    echo ""
+    echo "CI/CD:"
+    echo "  gh                        - GitHub CLI"
+    echo "  act                       - Run GitHub Actions locally"
+    echo "  gitlab-runner             - GitLab CI runner"
+    echo ""
+    echo "Utilities:"
+    echo "  jq / yq                   - JSON/YAML processors"
+    echo "  httpie / curl             - HTTP clients"
+    echo "  shellcheck                - Shell script linter"
+    echo ""
+    echo "💡 Tip: Use 'kubectx' and 'kubens' to quickly switch contexts"
+    echo ""
+  '';
+}

shells/python.nix

@@ -0,0 +1,78 @@
+# Modern Python development environment with marimo and uv — Nushell version
+# Usage: nix develop .#python   (drops into Nushell)
+{pkgs}: let
+  # Use the latest Python available in nixpkgs
+  python = pkgs.python314;
+in
+  pkgs.mkShell {
+    name = "python-marimo-dev";
+
+    buildInputs = with pkgs; [
+      # Python interpreter
+      python
+
+      # Modern package manager
+      uv
+
+      # Essential system dependencies for numpy and scientific packages
+      stdenv.cc.cc.lib
+      zlib
+      gfortran
+      openblas
+      lapack
+
+      # Nushell itself
+      nushell
+    ];
+
+    # Environment variables for proper library linking
+    LD_LIBRARY_PATH = "${pkgs.lib.makeLibraryPath [
+      pkgs.stdenv.cc.cc.lib
+      pkgs.zlib
+      pkgs.gfortran.cc.lib
+    ]}";
+
+    # Bash shellHook that sets up the environment and launches Nushell
+    shellHook = ''
+      echo "🐍 Python + Marimo Development Environment"
+      echo ""
+      echo "Python version: $(python --version)"
+      echo "uv version: $(uv --version)"
+      echo ""
+
+      # Create venv if it doesn't exist
+      if [ ! -d ".venv" ]; then
+        echo "Creating virtual environment..."
+        uv venv
+      fi
+
+      # Activate the virtual environment
+      source .venv/bin/activate
+
+      # Install marimo if not present
+      if ! python -c "import marimo" 2>/dev/null; then
+        echo "Installing marimo..."
+        uv pip install marimo
+      fi
+
+      # Install numpy if not present
+      if ! python -c "import numpy" 2>/dev/null; then
+        echo "Installing numpy..."
+        uv pip install numpy
+      fi
+
+      echo ""
+      echo "✅ Environment ready!"
+      echo ""
+      echo "Quick start:"
+      echo "  marimo edit               - Start marimo notebook"
+      echo "  uv pip install <package>  - Install packages"
+      echo "  python script.py          - Run Python scripts"
+      echo ""
+      echo "💡 Popular packages: uv pip install pandas matplotlib scipy scikit-learn"
+      echo ""
+
+      # Launch Nushell
+      exec nu
+    '';
+  }