Feat: rust flake with pds env

.gitignore

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+.env

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1750622754,
+        "narHash": "sha256-kMhs+YzV4vPGfuTpD3mwzibWUE6jotw5Al2wczI0Pv8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c7ab75210cb8cb16ddd8f290755d9558edde7ee1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1744536153,
+        "narHash": "sha256-awS2zRgF4uTwrOKwwiJcByDzDOdo3Q1rPZbiHQg/N38=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "18dd725c29603f582cf1900e0d25f9f1063dbf11",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1750732748,
+        "narHash": "sha256-HR2b3RHsPeJm+Fb+1ui8nXibgniVj7hBNvUbXEyz0DU=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "4b4494b2ba7e8a8041b2e28320b2ee02c115c75f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Example Rust development environment for Zero to Nix";
+
+  # Flake inputs
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    rust-overlay.url = "github:oxalica/rust-overlay"; # A helper for Rust + Nix
+  };
+
+  # Flake outputs
+  outputs = { self, nixpkgs, rust-overlay }:
+    let
+      pdsDirectory = "/home/pan/prog/atproto/authlink";
+
+      # Overlays enable you to customize the Nixpkgs attribute set
+      overlays = [
+        # Makes a `rust-bin` attribute available in Nixpkgs
+        (import rust-overlay)
+        # Provides a `rustToolchain` attribute for Nixpkgs that we can use to
+        # create a Rust environment
+        (self: super: {
+          rustToolchain = super.rust-bin.stable.latest.default;
+        })
+      ];
+
+      # Systems supported
+      allSystems = [
+        "x86_64-linux" # 64-bit Intel/AMD Linux
+        "aarch64-linux" # 64-bit ARM Linux
+        "x86_64-darwin" # 64-bit Intel macOS
+        "aarch64-darwin" # 64-bit ARM macOS
+      ];
+
+      # Helper to provide system-specific attributes
+      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
+        pkgs = import nixpkgs { inherit overlays system; };
+      });
+
+      # Systemd service configuration
+      createSystemdService = pkgs: pdsDir: pkgs.writeTextFile {
+        name = "pds.service";
+        text = ''
+          [Unit]
+          Description=Development Environment Service
+          After=network-online.target
+          Wants=network-online.target
+
+          [Service]
+          Type=simple
+          ExecStart=${pkgs.pds}/bin/pds
+          WorkingDirectory=${pdsDir}
+          EnvironmentFile=${pdsDir}/.env
+          Environment=PDS_DATA_DIRECTORY=${pdsDir}/.pds-data
+          Environment=PDS_BLOBSTORE_DISK_LOCATION=${pdsDir}/.pds-data/blocks
+
+          [Install]
+          WantedBy=multi-user.target
+        '';
+      };
+
+      # Scripts for managing the systemd service
+      createServiceScripts = pkgs: pdsDir: 
+        let
+          serviceFile = createSystemdService pkgs pdsDir;
+          serviceName = "pds";
+        in {
+          startScript = pkgs.writeShellScript "start-dev-service" ''
+            set -e
+
+            # Create user systemd directory if it doesn't exist
+            mkdir -p ~/.config/systemd/user
+
+            # Copy service file
+            cp -f ${serviceFile} ~/.config/systemd/user/${serviceName}.service
+
+            # Reload systemd and start service
+            systemctl --user daemon-reload
+            systemctl --user start ${serviceName}
+            systemctl --user enable ${serviceName}
+
+            systemctl --user status ${serviceName} --no-pager
+          '';
+
+          stopScript = pkgs.writeShellScript "stop-dev-service" ''
+            set -e
+            if systemctl --user is-enabled --quiet ${serviceName}; then
+              # Stop and disable service
+              systemctl --user stop ${serviceName} || true
+              systemctl --user disable ${serviceName} || true
+
+              # Remove service file
+              rm -f ~/.config/systemd/user/${serviceName}.service
+
+              # Reload systemd
+              systemctl --user daemon-reload
+            fi
+          '';
+        };
+    in
+    {
+      # Development environment output
+      devShells = forAllSystems ({ pkgs }:
+        let
+          scripts = createServiceScripts pkgs pdsDirectory;
+        in {
+          default = pkgs.mkShell {
+            # The Nix packages provided in the environment
+            packages = (with pkgs; [
+              systemd
+              # The package provided by our custom overlay. Includes cargo, Clippy, cargo-fmt,
+              # rustdoc, rustfmt, and other tools.
+              sqlx-cli
+              rustToolchain
+            ]) ++ pkgs.lib.optionals pkgs.stdenv.isDarwin (with pkgs; [ libiconv ]);
+
+            # Only run systemd commands on Linux
+            shellHook = pkgs.lib.optionalString pkgs.stdenv.isLinux ''
+              # Cleanup
+              ${scripts.stopScript}
+
+              # Start the systemd service
+              ${scripts.startScript}
+            '';
+          };
+        });
+    };
+}