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//! Evaluates the expression like Hydra would, with regards to
//! architecture support and recursed packages.
use std::fs::File;
use std::io::{self, Read};
#[derive(Debug)]
pub enum Error {
Io(io::Error),
Internal(Box<dyn std::error::Error>),
CommandFailed(File),
StatsParse(File, Result<u64, io::Error>, serde_json::Error),
UncleanEvaluation(Vec<String>),
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Error {
Error::Io(e)
}
}
impl Error {
pub fn display(self) -> String {
match self {
Error::Io(err) => format!("Failed during the setup of executing nix-env: {err:?}"),
Error::Internal(err) => format!("Internal error: {err:?}"),
Error::CommandFailed(mut fd) => {
let mut buffer = Vec::new();
let read_result = fd.read_to_end(&mut buffer);
let bufstr = String::from_utf8_lossy(&buffer);
match read_result {
Ok(_) => format!("nix-env failed:\n{bufstr}"),
Err(err) => format!(
"nix-env failed and loading the error result caused a new error {err:?}\n\n{bufstr}"
),
}
}
Error::UncleanEvaluation(warnings) => {
format!("nix-env did not evaluate cleanly:\n {warnings:?}")
}
Error::StatsParse(mut fd, seek, parse_err) => {
let mut buffer = Vec::new();
let read_result = fd.read_to_end(&mut buffer);
let bufstr = String::from_utf8_lossy(&buffer);
let mut lines =
String::from("Parsing nix-env's performance statistics failed.\n\n");
if let Err(seek_err) = seek {
lines.push_str(&format!(
"Additionally, resetting to the beginning of the output failed with:\n{seek_err:?}\n\n"
));
}
if let Err(read_err) = read_result {
lines.push_str(&format!(
"Additionally, loading the output failed with:\n{read_err:?}\n\n"
));
}
lines.push_str(&format!("Parse error:\n{parse_err:?}\n\n"));
lines.push_str(&format!("Evaluation output:\n{bufstr}"));
lines
}
}
}
}
|
