log4rs error Log4rs(Os { code: 2, kind: NotFound, message: "No such file or directory" }) - rust

Question

I'm trying to implement log4rs by following the docs. My goal is to put the result of info!("INFO") into the file requests.log, but I get an error:
thread 'main' panicked at 'called Result::unwrap() on an Err
value: Log4rs(Os { code: 2, kind: NotFound, message: "No such file or
directory" })', libcore/result.rs:945:5
I have the following files in the src folder:
- main.rs
- log4rs.yml
- requests.log
main.rs:
#[macro_use]
extern crate log;
extern crate log4rs;
fn main() {
println!("Hello, world!");
log4rs::init_file("log4rs.yml", Default::default()).unwrap();
info!("INFO");
}
the config file log4rs.yml:
# Scan this file for changes every 30 seconds
refresh_rate: 30 seconds
appenders:
# An appender named "stdout" that writes to stdout
stdout:
kind: console
# An appender named "requests" that writes to a file with a custom pattern encoder
requests:
kind: file
path: "requests.log"
encoder:
pattern: "{d} - {m}{n}"
# Set the default logging level to "warn" and attach the "stdout" appender to the root
root:
level: warn
appenders:
- stdout
loggers:
# Raise the maximum log level for events sent to the "app::backend::db" logger to "info"
app::backend::db:
level: info
# Route log events sent to the "app::requests" logger to the "requests" appender,
# and *not* the normal appenders installed at the root
app::requests:
level: info
appenders:
- requests
additive: false

Answer 1

When you type cargo run, your working directory is the current directory. This means that all your relative paths will depend on this working directory.
For example, if you are in your home directory (~) and you have your project folder named foo. When you go in it, that gives you ~/foo. If you now type cargo run, that means that when log4rs tries to open your file it will try to open the file ~/foo/log4rs.yml. The file is not here but in ~/foo/src/log4rs.yml
You have many solutions:
log4rs::init_file("src/log4rs.yml", Default::default()).unwrap();
move log4rs.yml to foo
use an absolute path (not a good solution for your current case)