Railway•2y ago

Rust app failing with `No such file or directory`

Basically i am trying to deploy a rust app that needs to read files that are part of the codebase. these files are checked in too. but the app is failing with No such file or directory I am deploying via the cli railway up

43 Replies

Percy•2y ago

Project ID: N/A

Percy•2y ago

It appears that the issue is related to the .nixpacks directory not being able to find the Cargo.toml file.

⚠️ experimental feature

sebastiantfOP•2y ago

N/A the app builds the application fine with the Cargo.toml. But on runtime, it doesnt seem to find a file also railway shell doesn't seem to work even after doing railway link

alex•2y ago

run railway -V what version of cli are you running *capital V btw

sebastiantfOP•2y ago

3.0.1

alex•2y ago

upgrade 3.0.1 is bugged curl -fsSL https://raw.githubusercontent.com/railwayapp/cli/master/install.sh | bash

sebastiantfOP•2y ago

upgraded to 3.0.3 but railway shell is just opening my own local in a different shell within how to list the directory structure of the deployment? i think theres a mismatch in that

alex•2y ago

it is supposed to do that it just injects your env vars into the shell btw for rust just include_as_str!

sebastiantfOP•2y ago

oh i thought its opens a shell in the container. mb

alex•2y ago

also railway storage is ephemeral no persistent storage if you need persistent storage spin up a postgres

Brody•2y ago

or use a bucket

sebastiantfOP•2y ago

so programs on railway cannot do a fs read?

Brody•2y ago

yes they can

alex•2y ago

they can read, not write i believe

sebastiantfOP•2y ago

i dont want to write

alex•2y ago

and between relaunches it will disappear are you using relative file URIs?

Brody•2y ago

they can read and write, its just anything you write gets wiped on next deploy

alex•2y ago

oh i misunderstood

Brody•2y ago

no worries

sebastiantfOP•2y ago

.
├── Cargo.lock
├── Cargo.toml
├── README.md
// --snip--
├── config
│   └── log4rs.yaml
├── logs
│   └── logs.log
// --snip--
├── src
│   ├── lib.rs
│   ├── main.rs
// --snip--
└── target
    ├── CACHEDIR.TAG
    ├── debug
    └── release

.
├── Cargo.lock
├── Cargo.toml
├── README.md
// --snip--
├── config
│   └── log4rs.yaml
├── logs
│   └── logs.log
// --snip--
├── src
│   ├── lib.rs
│   ├── main.rs
// --snip--
└── target
    ├── CACHEDIR.TAG
    ├── debug
    └── release

basically this is the dir structure i am doing railway up from

alex•2y ago

where is the file

sebastiantfOP•2y ago

the rust app is trying to read ./config/log4rs.yaml

alex•2y ago

ok erm

sebastiantfOP•2y ago

i tried logging the path its trying to access and it prints this: path: "/app/config/log4rs.yaml"

alex•2y ago

IDK how nixpacks handles that stuff can you ls the foldr see if the file is even there lmao

sebastiantfOP•2y ago

let mut path = PathBuf::new();
path.push(std::env::current_dir().unwrap());
path.push("config/log4rs.yaml");
println!("path: {:#?}", path);
log4rs::init_file(path, Default::default()).unwrap();

let mut path = PathBuf::new();
path.push(std::env::current_dir().unwrap());
path.push("config/log4rs.yaml");
println!("path: {:#?}", path);
log4rs::init_file(path, Default::default()).unwrap();

this is the code for that i dont know how to do that. i was hoping railway shell logs me into that deployment container. but it doesnt

alex•2y ago

what kind of persistent application rocket.rs? whats the app even for

sebastiantfOP•2y ago

its basically just a web server but i am using log4rs and reading its config from that file

alex•2y ago

hmm no clue then

sebastiantfOP•2y ago

looking at the build logs, i suppose railway only copies the final executable from the build into the docker image and runs that. that doesn't include any of the other files

alex•2y ago

thats what i thought you should use the rust macro include_as_str!("path"); it will... include the file as an &str

sebastiantfOP•2y ago

can you point me to a doc for that? couldnt find it googling

alex•2y ago

nvm im studipd istits just include_str!(); i made a goof my bad

alex•2y ago

https://doc.rust-lang.org/std/macro.include_str.html

include_str in std - Rust

Includes a UTF-8 encoded file as a string.

alex•2y ago

This macro will yield an expression of type &'static str which is the contents of the file.

sebastiantfOP•2y ago

but it still needs to read the file doesnt it?

alex•2y ago

it will do it during build time macro will expand during build

sebastiantfOP•2y ago

oh okay. let me try

alex•2y ago

sebastiantfOP•2y ago

awesome! that worked. thnx! 🙏 🙏 altho i suppose i cannot use any kind of variable or env var for the path in include_str can I? i was planning to move that config file path to an env var or something

Brody•2y ago

sure you can maybe not with include_str, but you can read the string from the env variable

sebastiantfOP•2y ago

yeah include_str requires it to be string literal

alex•2y ago

if you do it with env var nothing will change because the file will be sucked up at build time and rust will not care at all

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Rust app failing with `No such file or directory`