feat: optional submodule fetching

README.md

@@ -48,6 +48,7 @@ it is converted to an attribute set equivalent to `{ root = theArg; }`.
 | `src` | Used by `naersk` as source input to the derivation. When `root` is not set, `src` is also used to discover the `Cargo.toml` and `Cargo.lock`. |
 | `root` | Used by `naersk` to read the `Cargo.toml` and `Cargo.lock` files. May be different from `src`. When `src` is not set, `root` is (indirectly) used as `src`. |
 | `allRefs` | Whether to fetch all refs while fetching Git dependencies. Useful if the wanted revision isn't in the default branch. |
+| `gitSubmodules` | Whether to fetch submodules while fetching Git dependencies. |
 | `cargoBuild` | The command to use for the build. The argument must be a function modifying the default value. <br/> Default: `''cargo $cargo_options build $cargo_build_options >> $cargo_build_output_json''` |
 | `cargoBuildOptions` | Options passed to cargo build, i.e. `cargo build <OPTS>`. These options can be accessed during the build through the environment variable `cargo_build_options`. <br/> Note: naersk relies on the `--out-dir out` option and the `--message-format` option. The `$cargo_message_format` variable is set based on the cargo version.<br/> Note: these values are not (shell) escaped, meaning that you can use environment variables but must be careful when introducing e.g. spaces. <br/> The argument must be a function modifying the default value. <br/> Default: `[ "$cargo_release" ''-j "$NIX_BUILD_CORES"'' "--message-format=$cargo_message_format" ]` |
 | `remapPathPrefix` | When `true`, rustc remaps the (`/nix/store`) source paths to `/sources` to reduce the number of dependencies in the closure. Default: `true` |

config.nix

@@ -28,6 +28,8 @@ let
     # Whether to fetch all refs while fetching Git dependencies. Useful if
     # the wanted revision isn't in the default branch.
     allRefs = attrs0.allRefs or false;
+    # Whether to fetch submodules while fetching Git dependencies.
+    gitSubmodules = attrs0.gitSubmodules or false;
 
     # The command to use for the build.
     cargoBuild =
@@ -254,7 +256,7 @@ let
     # Whether we skip pre-building the deps
     isSingleStep = attrs.singleStep;
 
-    inherit (attrs) overrideMain allRefs;
+    inherit (attrs) overrideMain allRefs gitSubmodules;
 
     # The members we want to build
     # (list of directory names)

default.nix

@@ -26,7 +26,7 @@ let
     let
       config = mkConfig arg;
       gitDependencies =
-        libb.findGitDependencies { inherit (config) cargolock allRefs; };
+        libb.findGitDependencies { inherit (config) cargolock allRefs gitSubmodules; };
       cargoconfig =
         if builtinz.pathExists (toString config.root + "/.cargo/config")
         then builtins.readFile (config.root + "/.cargo/config")

lib.nix

@@ -73,7 +73,7 @@ rec
   #   }
   # ]
   findGitDependencies =
-    { cargolock, allRefs }:
+    { cargolock, allRefs, gitSubmodules }:
     let
       query = p: (lib.substring 0 4 (p.source or "")) == "git+";
 
@@ -113,6 +113,8 @@ rec
           ref = lock.tag;
         } // lib.optionalAttrs allRefs {
           allRefs = true;
+        } // lib.optionalAttrs gitSubmodules {
+          submodules = true;
         });
       } // lock;
     in lib.foldl' (acc: e: if lib.any (oe: (oe.url == e.url) && (oe.key == e.key)) acc then acc else acc ++ [e]) [] (builtins.map mkFetch packageLocks);