Initial commit

It begins...

home/modules/lib/cloneRepo.nix

@@ -0,0 +1,67 @@
+{ lib, config, ... }:
+with lib;
+{
+  options = {
+    impure.clonedRepos = mkOption {
+      description = "Repositories to clone";
+      default = {};
+      type = with types; loaOf (
+        let sm = submodule {
+          options = {
+            url = mkOption {
+              type = nullOr str;
+              description = "URL of repository to clone";
+              default = null;
+            };
+
+            github = mkOption {
+              type = nullOr str;
+              description = "Github owner/repo of repository to clone";
+              default = null;
+            };
+
+            path = mkOption {
+              type = str;
+              description = "Path to clone to";
+            };
+
+            onClone = mkOption {
+              type = str;
+              description = ''
+                Shell command to run after cloning the repo for the first time.
+                Runs inside the repo itself.
+              '';
+              default = "";
+            };
+
+            after = mkOption {
+              type = listOf str;
+              description = "Activation hooks that this repository must be cloned after";
+              default = [];
+            };
+          };
+        };
+        in addCheck sm (cr: (! isNull cr.url || ! isNull cr.github))
+      );
+    };
+  };
+
+  config = {
+    home.activation =
+      mapAttrs
+      (_: {
+        url, path, github, onClone, after
+      }:
+        let repoURL = if isNull url then "git@github.com:${github}" else url;
+        in hm.dag.entryAfter (["writeBoundary"] ++ after) ''
+          $DRY_RUN_CMD mkdir -p $(dirname "${path}")
+          if [[ ! -d ${path} ]]; then
+            $DRY_RUN_CMD git clone "${repoURL}" "${path}"
+            pushd ${path}
+            $DRY_RUN_CMD ${onClone}
+            popd
+          fi
+        '')
+      config.impure.clonedRepos;
+  };
+}