Bump nix inputs

Author: michaelpj

nix/sources.json

@@ -5,10 +5,10 @@
         "homepage": "",
         "owner": "hercules-ci",
         "repo": "gitignore.nix",
-        "rev": "5b9e0ff9d3b551234b4f3eb3983744fa354b17f1",
-        "sha256": "01l4phiqgw9xgaxr6jr456qmww6kzghqrnbc7aiiww3h6db5vw53",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
+        "sha256": "07vg2i9va38zbld9abs9lzqblz193vc5wvqd6h7amkmwf66ljcgh",
         "type": "tarball",
-        "url": "https://github.com/hercules-ci/gitignore.nix/archive/5b9e0ff9d3b551234b4f3eb3983744fa354b17f1.tar.gz",
+        "url": "https://github.com/hercules-ci/gitignore.nix/archive/a20de23b925fd8264fd7fad6454652e142fd7f73.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "niv": {
@@ -17,10 +17,10 @@
         "homepage": "https://github.com/nmattia/niv",
         "owner": "nmattia",
         "repo": "niv",
-        "rev": "5830a4dd348d77e39a0f3c4c762ff2663b602d4c",
-        "sha256": "1d3lsrqvci4qz2hwjrcnd8h5vfkg8aypq3sjd4g3izbc8frwz5sm",
+        "rev": "689d0e5539eddd0b0f566aee7bb18629eee7df74",
+        "sha256": "1rld3lk42l6b01f2gcrhq8qm9vry1awmfl29zmpiqda9dy89vbx0",
         "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/5830a4dd348d77e39a0f3c4c762ff2663b602d4c.tar.gz",
+        "url": "https://github.com/nmattia/niv/archive/689d0e5539eddd0b0f566aee7bb18629eee7df74.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
@@ -29,10 +29,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5efc8ca954272c4376ac929f4c5ffefcc20551d5",
-        "sha256": "15xncc1afq8v78acrcv8xbfkd3ii147mv9a55823pdbqffzg0x54",
+        "rev": "293a28df6d7ff3dec1e61e37cc4ee6e6c0fb0847",
+        "sha256": "1m6smzjz3agkyc6dm83ffd8zr744m6jpjmffppvcdngk82mf3s3r",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/5efc8ca954272c4376ac929f4c5ffefcc20551d5.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/293a28df6d7ff3dec1e61e37cc4ee6e6c0fb0847.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }

nix/sources.nix

@@ -31,8 +31,28 @@ let
           if spec ? branch then "refs/heads/${spec.branch}" else
             if spec ? tag then "refs/tags/${spec.tag}" else
               abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
+      submodules = if spec ? submodules then spec.submodules else false;
+      submoduleArg =
+        let
+          nixSupportsSubmodules = builtins.compareVersions builtins.nixVersion "2.4" >= 0;
+          emptyArgWithWarning =
+            if submodules == true
+            then
+              builtins.trace
+                (
+                  "The niv input \"${name}\" uses submodules "
+                  + "but your nix's (${builtins.nixVersion}) builtins.fetchGit "
+                  + "does not support them"
+                )
+                {}
+            else {};
+        in
+          if nixSupportsSubmodules
+          then { inherit submodules; }
+          else emptyArgWithWarning;
     in
-      builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; };
+      builtins.fetchGit
+        ({ url = spec.repo; inherit (spec) rev; inherit ref; } // submoduleArg);
 
   fetch_local = spec: spec.path;