nixos build failure

[polarmutex]

I am trying to build a leptos site to run on Nixos.

The project tries to create a cache folder when compiling the front even with "no_downloads" feature enabled.

I think the solution is to decouple ExeMeta from the cach dir. Where we can access the ExeMeta but not do any cach dir checks.

Thoughts or other paths I can look into, willing to make the changes just want to get your thoughts on fixing it

[benwis]

Hi! I'd love to here more about how you're building it! I have nix devshells and sites working, but it's possible I missed something.

There's also an edge case where if you've downloaded cargo-leptos previously without the --no-downloads flag, it'll still have the .cache folder and error. You'll want to delete that folder if so

[polarmutex]

I am trying to build my leptos site into a derivation. I am using the cargo-leptos nix code you have pending submission to nikpkgs. What I am seeing is the cache folder is created even though with "no_downloads" you never use it. So when you build a derivation it complains as it can not create that cache folder.

the ExeMeta and Exe classes will check for that folder and try to create it even though we set the no_downloads feature. It looks like it is not a straight forward change to try that behavior. Upon looking to create a derivation, I am starting to wonder just to build the server normally and use wasm-pack to build the wasm and merge them to together since this project seems to prioritize filesystem manipulation which nix frowns upon.

[benwis]

I'll have to double check that. I would say it's about the same level of complexity, but that's fair.

[benwis]

@polarmutex If you'd like to try my main branch here: https://github.com/benwis/cargo-leptos with your derivation, I think I configured it to not create the cache dir if the no_downloads feature is enabled

[polarmutex]

I have tried that locally, it gets further. but when compiling the frontend it is creating the folder

[benwis]

Could you post your Nix file ? I'll try it myself and not bug you quite as much. Otherwise I can modify one of my crane files with that pkgdir and see what's going on. It's good to catch it now before the nixpkgs people get around to it

[polarmutex]

https://github.com/polarmutex/website/blob/feat/rust/flake.nix is what I am currently using

might still be some issues in my nix code or might need to try a less complex nix rust flake template

[benwis]

Nice work! This is almost my default Rust Flake template. I'll setup a test env and make sure everything is good

[benwis]

I have made some progress, although it produces a new error. It looks like I need a way to pass additional args to the cargo build command so that we can generate the json file crane uses to find the binaries, or define our own install commands. Option 1 sounds easier to me

[polarmutex]

I just tried your changes and did not see that error (i do have the dependencies as build inputs to crane). Not sure that is why I am avoiding that error.

I did run into an error where the target/site (or the folder you define where the css, wasm, and js build to is not there when the css is moved to the folder. starting to look if we need to do a "mkdir -p" before moving

[benwis]

It might be because I'm trying to build a workspace, but my test.nix is pretty close to yours. Makes sense there'd need to be a manual file copy step for this to work. Let me know if you get it working, and especially if you run into any bugs

[polarmutex]

got to build (and even runs successfully) with your currrent cargo-leptos build

• had to add more dependencies to the build inputs
• do not clean source (deletes css and other non rust files)
• add an installPhase command to crane

Thanks for looking into this

[benwis]

Alright, I've got it working too. It looks like I may have broken regular operation in some way, but once I figure out why, #80 can be merged and I'll update the nixpkg

[benwis]

@polarmutex A new version of cargo-leptos is out with a version of my proposed changes, and I have updated the Nixpkg PR. Let me know if that has any issues for you

[polarmutex]

v0.1.8 works for me, thanks for the changes