set rust source/base folder

[jimkring]

It would be nice to be able to set the source/base folder used by the Swatinem/rust-cache action.

Background:

I have a tauri project and all the rust code is in a folder named src-tauri
The Swatinem/rust-cache action is complaining that it cannot find a Cargo.toml file in the root folder of my repository. However, I actually have my rust source in a subfolder.

 Error: The process 'C:\Users\runneradmin\.cargo\bin\cargo.exe' failed with exit code 101
    at ExecState._setResult (D:\a\_actions\Swatinem\rust-cache\v2\dist\restore\index.js:9728:25)
    at ExecState.CheckComplete (D:\a\_actions\Swatinem\rust-cache\v2\dist\restore\index.js:9711:18)
    at ChildProcess.<anonymous> (D:\a\_actions\Swatinem\rust-cache\v2\dist\restore\index.js:9605:27)
    at ChildProcess.emit (node:events:519:28)
    at maybeClose (node:internal/child_process:1105:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5) {
  commandFailed: {
    command: 'cargo metadata --all-features --format-version 1 --no-deps',
    stderr: 'error: could not find `Cargo.toml` in `D:\\a\\my-repo\\my-repo` or any parent directory\n'
  }

Is there a way to change the root folder that Swatinem/rust-cache uses?

I'm not sure if it will work, but I'm going to give this a try.

        - uses: Swatinem/rust-cache@v2
        with:
          # default: ". -> target"
          workspaces: "src-tauri -> src-tauri/target"

I don't get any errors, so far (just says "... Restoring cache ... No cache found."). It will take me a couple hours to get through my build and try new build to see if it finds a cache hit.

Even if this works, I might request that a new parameter/argument be added to the Swatinem/rust-cache called source_directory that defaults to "." which can be used for pointing to a subfolder. Sometimes, people use monorepos a lot and the probably don't want to have to do things like workspaces: "mono/repo/rust/sub/project/ -> mono/repo/rust/sub/project/target" to get this action to work. They'd probably prefer to simply put:

source_folder: "mono/repo/rust/sub/project/" and have any "workspaces" specified relative to that source_folder (or maybe call it "base_folder").

Thanks for listening...

[MC-XiaoHei]

I did it with this code:

uses: Swatinem/rust-cache@v2
with:
  workspaces: './src-tauri -> target'