Fix Nix flake build (linera-io#2570)

default.nix

@@ -1,4 +1,4 @@
-{ crane, pkgs, rust-toolchain }:
+{ crane, pkgs, rust-toolchain, libclang, rocksdb, git }:
 ((crane.mkLib pkgs).overrideToolchain rust-toolchain).buildPackage {
   pname = "linera";
   src = ./.;
@@ -15,6 +15,7 @@
     nodejs
     openssl
     protobuf
+    git
   ];
   checkInputs = with pkgs; [
     # for native testing
@@ -29,4 +30,7 @@
     wasm-pack
   ];
   passthru = { inherit rust-toolchain; };
+  RUST_SRC_PATH = rust-toolchain.availableComponents.rust-src;
+  LIBCLANG_PATH = "${libclang.lib}/lib";
+  ROCKSDB_LIB_DIR = "${rocksdb}/lib";
 }

flake.nix

@@ -27,17 +27,17 @@
           ./toolchains/stable/rust-toolchain.toml);
         rust-nightly = (pkgs.rust-bin.fromRustupToolchainFile
           ./toolchains/nightly/rust-toolchain.toml);
-        devShell = rust-toolchain: pkgs.mkShell {
+        devShell = rust-toolchain: let linera' = linera rust-toolchain; in pkgs.mkShell {
           inputsFrom = [
             config.treefmt.build.devShell
-            (linera rust-toolchain)
+            linera'
           ];
           shellHook = ''
             # For rust-analyzer 'hover' tooltips to work.
-            export RUST_SRC_PATH=${rust-toolchain.availableComponents.rust-src}
-            export LIBCLANG_PATH=${pkgs.libclang.lib}/lib
             export PATH=$PWD/target/debug:~/.cargo/bin:$PATH
-            export ROCKSDB_LIB_DIR=${pkgs.rocksdb}/lib
+            export RUST_SRC_PATH="${linera'.RUST_SRC_PATH}"
+            export LIBCLANG_PATH="${linera'.LIBCLANG_PATH}"
+            export ROCKSDB_LIB_DIR="${linera'.ROCKSDB_LIB_DIR}";
           '';
           nativeBuildInputs = with pkgs; [
             rust-analyzer
@@ -49,7 +49,7 @@
           overlays = [ (import inputs.rust-overlay) ];
         };
 
-        packages.default = linera;
+        packages.default = linera rust-stable;
 
         # Rust dev environment
         devShells.default = devShell rust-stable;