cargo doesn't know which to use because multiple target files found

[dj95]

First of all thanks for providing the flake! It's really awesome and simplifies packaging rust projects for nix.

Describe the bug

Starting with commit 62e5013, I cannot build my projects anymore, that only contain binaries within the src/bin/ directory.

I'm using this flake in https://github.com/dj95/zjstatus to package the project. Simplified, the project setup is

src/bin/zjstatus.rs
src/bin/zjframes.rs
src/lib.rs
flake.nix

When building the flake of zjstatus with nix flake check . when using a commit newer than 62e5013, the build will fail with the following error:

       > Running phase: configurePhase
       > will append /private/tmp/nix-build-zjstatus-deps-0.19.1.drv-0/source/.cargo-home/config.toml with contents of /nix/store/8fyaknmzzlgzmfxzn0my7fjwrcm3sykb-vendor-cargo-deps/config.toml
       > default configurePhase, nothing to do
       > Running phase: buildPhase
       > ++ command cargo --version
       > cargo 1.83.0 (5ffbef321 2024-10-29)
       > ++ command cargo check --release --target wasm32-wasip1
       > error: failed to parse manifest at `/private/tmp/nix-build-zjstatus-deps-0.19.1.drv-0/source/Cargo.toml`
       >
       > Caused by:
       >   cannot infer path for `zjstatus` bin
       >   Cargo doesn't know which to use because multiple target files found at `src/main.rs` and `src/bin/zjstatus.rs`.
       For full logs, run 'nix log /nix/store/vmc65y5xzzpiv36gbb6qz4b0fix9dsvx-zjstatus-deps-0.19.1.drv'.

When using a commit before the specific one, everything works fine.

This also occurs in different other projects I maintain.

Reproduction

• git clone https://github.com/dj95/zjstatus
• Apply the following patch with git apply PATCH_FILE_NAME

diff --git a/flake.lock b/flake.lock
index 5185d1b..a27e0ec 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,17 +2,17 @@
   "nodes": {
     "crane": {
       "locked": {
-        "lastModified": 1733286231,
-        "narHash": "sha256-mlIDSv1/jqWnH8JTiOV7GMUNPCXL25+6jmD+7hdxx5o=",
+        "lastModified": 1733418579,
+        "narHash": "sha256-0fJaoI4B9Nn67E1P44usZhZHkSSyWdAI23HU+X+HJCQ=",
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "af1556ecda8bcf305820f68ec2f9d77b41d9cc80",
+        "rev": "62e50137688d953557f156f01e2ad2a25b22d66c",
         "type": "github"
       },
       "original": {
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "af1556ecda8bcf305820f68ec2f9d77b41d9cc80",
+        "rev": "62e50137688d953557f156f01e2ad2a25b22d66c",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index e96747d..b834e7a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,7 +5,7 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
 
     crane = {
-      url = "github:ipetkov/crane/af1556ecda8bcf305820f68ec2f9d77b41d9cc80";
+      url = "github:ipetkov/crane/62e50137688d953557f156f01e2ad2a25b22d66c";
     };
 
     flake-utils.url = "github:numtide/flake-utils";

• Run nix flake check . within the patched repository

Feel free to message me in case you need more information.

[ipetkov]

Hi @dj95 thanks for the report and the reproduction! This should be fixed with #770

[dj95]

Works like a charm. Thanks a lot for the quick fix!