Add libs

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

README.md

@@ -1,3 +1,3 @@
 # nix-lib
 
-NixOS libraries and utilities
+Nix library function definitions and utilities.

flake.lock

@@ -0,0 +1,48 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1754725699,
+        "narHash": "sha256-iAcj9T/Y+3DBy2J0N+yF9XQQQ8IEb5swLFzs23CdP88=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "85dbfc7aaf52ecb755f87e577ddbe6dbbdbc1054",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "treefmt-nix": "treefmt-nix"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1754847726,
+        "narHash": "sha256-2vX8QjO5lRsDbNYvN9hVHXLU6oMl+V/PsmIiJREG4rE=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "7d81f6fb2e19bf84f1c65135d1060d829fae2408",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,31 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    inputs:
+    (
+      let
+        system = "x86_64-linux";
+
+        pkgs = import inputs.nixpkgs {
+          inherit system;
+          config.allowUnfree = true;
+        };
+
+        treefmt = inputs.treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
+      in
+      {
+        lib.${system} = import ./lib { inherit pkgs; };
+
+        formatter.${system} = treefmt.config.build.wrapper;
+        checks.${system}.formatting = treefmt.config.build.check inputs.self;
+      }
+    );
+}

lib/default.nix

@@ -0,0 +1,5 @@
+{ pkgs, ... }:
+{
+  fetchers = import ./fetchers { inherit pkgs; };
+  runtime = import ./runtime { inherit pkgs; };
+}

lib/fetchers/default.nix

@@ -0,0 +1,4 @@
+{ pkgs, ... }:
+{
+  sshKnownHosts = import ./sshKnownHosts { inherit pkgs; };
+}

lib/fetchers/sshKnownHosts/default.nix

@@ -0,0 +1,33 @@
+{ pkgs, ... }:
+pkgs.lib.fetchers.withNormalizedHash { } (
+  {
+    host,
+    name ? "ssh-known-hosts-${host}",
+    outputHash,
+    outputHashAlgo,
+    port ? 22,
+    keyTypes ? [
+      "rsa"
+      "ecdsa"
+      "ed25519"
+    ],
+  }:
+  let
+    keyTypeArgs = pkgs.lib.concatStringsSep "," keyTypes;
+  in
+  pkgs.runCommandLocal name
+    {
+      inherit outputHash outputHashAlgo;
+      outputHashMode = "flat";
+      preferLocalBuild = true;
+
+      nativeBuildInputs = with pkgs; [
+        openssh
+        gnugrep
+        coreutils
+      ];
+    }
+    ''
+      ssh-keyscan -p ${toString port} -t ${keyTypeArgs} ${host} | grep -v '^#' | sort > $out
+    ''
+)

lib/runtime/default.nix

@@ -0,0 +1,4 @@
+{ pkgs, ... }:
+{
+  merge = import ./merge { inherit pkgs; };
+}

lib/runtime/merge/default.nix

@@ -0,0 +1,4 @@
+{ pkgs, ... }:
+{
+  keyValue = import ./keyValue { inherit pkgs; };
+}

lib/runtime/merge/keyValue/default.nix

@@ -0,0 +1,11 @@
+{ pkgs, ... }:
+"${
+  pkgs.writeShellApplication {
+    name = "merge-key-value";
+    runtimeInputs = with pkgs; [
+      coreutils
+      gawk
+    ];
+    text = builtins.readFile ./key-value.sh;
+  }
+}/bin/merge-key-value"

lib/runtime/merge/keyValue/key-value.sh

@@ -0,0 +1,15 @@
+# shellcheck shell=bash
+
+source=$(realpath -m "$1")
+target=$(realpath -m "$2")
+
+if [[ -f "$target" ]]; then
+  temp=$(mktemp)
+  awk -F '=' 'NR==FNR{a[$1]=$0;next}($1 in a){$0=a[$1]}1' "$source" "$target" > "$temp"
+  mv "$temp" "$target"
+else
+  mkdir -p "$(dirname "$target")"
+  cp "$source" "$target"
+fi
+
+echo "Configuration file $target has been updated."

treefmt.nix

@@ -0,0 +1,26 @@
+{ ... }:
+{
+  projectRootFile = "flake.nix";
+
+  programs = {
+    nixfmt = {
+      enable = true;
+      strict = true;
+    };
+
+    shellcheck.enable = true;
+    prettier.enable = true;
+    gofmt.enable = true;
+  };
+
+  settings.global.excludes = [
+    # Git
+    "*/.gitignore"
+    ".gitattributes"
+    ".envrc"
+    # Manifest Files
+    "*/package.json"
+    "*/go.mod"
+    "*/bun.lockb"
+  ];
+}