fix: Update npins version

npins/sources.nix

@@ -1,5 +1,3 @@
-# Based off of:
-# https://github.com/NixOS/nixpkgs/blob/776c3bee4769c616479393aeefceefeda16b6fcb/pkgs/tools/nix/npins/source.nix
 {
   lib,
   fetchurl,
@@ -8,7 +6,16 @@
 }:
 builtins.mapAttrs
 (
-  _: let
+  name: let
+    getUrl = {
+      url,
+      hash,
+      ...
+    }:
+      fetchurl {
+        inherit url;
+        sha256 = hash;
+      };
     getZip = {
       url,
       hash,
@@ -23,19 +30,29 @@ builtins.mapAttrs
       repository,
       revision,
       url ? null,
+      submodules,
       hash,
       ...
     } @ attrs:
       assert repository ? type;
-        if url != null
+        if url != null && !submodules
         then getZip attrs
         else
           assert repository.type == "Git"; let
-            urlToName = url: rev: let
-              matched = builtins.match "^.*/([^/]*)(\\.git)?$" repository.url;
-              short = builtins.substring 0 7 rev;
+            url' =
+              if repository.type == "Git"
+              then repository.url
+              else if repository.type == "GitHub"
+              then "https://github.com/${repository.owner}/${repository.repo}.git"
+              else if repository.type == "GitLab"
+              then "${repository.server}/${repository.repo_path}.git"
+              else throw "Unrecognized repository type ${repository.type}";
+
+            name = let
+              matched = builtins.match "^.*/([^/]*)(\\.git)?$" url';
+              short = builtins.substring 0 7 revision;
               appendShort =
-                if (builtins.match "[a-f0-9]*" rev) != null
+                if (builtins.match "[a-f0-9]*" revision) != null
                 then "-${short}"
                 else "";
             in "${
@@ -43,43 +60,53 @@ builtins.mapAttrs
               then "source"
               else builtins.head matched
             }${appendShort}";
-            name = urlToName repository.url revision;
           in
             fetchgit {
               inherit name;
-              inherit (repository) url;
+              url = url';
               rev = revision;
               sha256 = hash;
+              fetchSubmodules = submodules;
             };
-
-    mkPyPiSource = {
-      url,
-      hash,
-      ...
-    }:
-      fetchurl {
-        inherit url;
-        sha256 = hash;
-      };
   in
     spec:
       assert spec ? type; let
+        mayOverride = path: let
+          envVarName = "NPINS_OVERRIDE_${saneName}";
+          saneName = lib.stringAsChars (c:
+            if (builtins.match "[a-zA-Z0-9]" c) == null
+            then "_"
+            else c)
+          name;
+          ersatz = builtins.getEnv envVarName;
+        in
+          if ersatz == ""
+          then path
+          else
+            # this turns the string into an actual Nix path (for both absolute and
+            # relative paths)
+            builtins.trace "Overriding path of \"${name}\" with \"${ersatz}\" due to set \"${envVarName}\"" (
+              if builtins.substring 0 1 ersatz == "/"
+              then /. + ersatz
+              else /. + builtins.getEnv "PWD" + "/${ersatz}"
+            );
         func =
           {
             Git = mkGitSource;
             GitRelease = mkGitSource;
-            PyPi = mkPyPiSource;
+            PyPi = getUrl;
             Channel = getZip;
+            Tarball = getUrl;
           }
           .${spec.type}
           or (builtins.throw "Unknown source type ${spec.type}");
       in
-        spec // {outPath = func spec;}
+        spec // {outPath = mayOverride (func spec);}
 )
 (
   let
     json = lib.importJSON ./sources.json;
   in
-    assert lib.assertMsg (json.version == 3) "Npins version mismatch!";
+    assert lib.assertMsg (json.version == 5) "Npins version mismatch!";
       json.pins
 )