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fn main() {
main_args(std::env::args().collect()).unwrap_or_else(|e| e.exit());
}
pub fn main_args(args: Vec<String>) -> clap::Result<NixResult> {
let matches = clap::App::new("nix-store")
.subcommand(clap::App::new("--add").arg(clap::Arg::new("FILE").required(true).index(1)))
.try_get_matches_from(args.iter())?;
if let Some(add) = matches.subcommand_matches("--add") {
let file = add.value_of("FILE").expect("--add needs a file");
let file_contents =
std::fs::read_to_string(file).expect(&format!("file {} does not exist", file));
Ok(NixResult::FileAddedToStore {
content: file_contents,
})
} else {
panic!("read some arguments that we do not know: {:?}", args)
}
}
#[derive(Debug, Eq, PartialEq)]
pub enum NixResult {
FileAddedToStore { content: String },
}
#[cfg(test)]
mod integration_tests {
use std::collections::VecDeque;
use std::io::Write;
use super::*;
#[derive(Debug)]
enum NixOutput {
Err {
status: i32,
stdout: String,
stderr: String,
},
Ok {
stdout: String,
stderr: String,
},
}
fn run_nix_command(cmd: &str, args: Vec<String>) -> NixOutput {
let out = std::process::Command::new(cmd)
.args(args)
.output()
.expect(&format!("could not run {}", cmd));
match out.status.code().expect("no status code!") {
0 => NixOutput::Ok {
stdout: String::from_utf8_lossy(&out.stdout).trim_end().to_string(),
stderr: String::from_utf8_lossy(&out.stderr).trim_end().to_string(),
},
status => NixOutput::Err {
status,
stdout: String::from_utf8_lossy(&out.stdout).trim_end().to_string(),
stderr: String::from_utf8_lossy(&out.stderr).trim_end().to_string(),
},
}
}
fn nix_nix_store<'a>(args: Vec<String>) -> NixResult {
match run_nix_command("nix-store", args) {
err @ NixOutput::Err { .. } => panic!("nix-store --add failed: {:#?}", err),
NixOutput::Ok { stdout, .. } => NixResult::FileAddedToStore {
content: std::fs::read_to_string(&stdout)
.expect(&format!("cannot open {} as store file", stdout)),
},
}
}
fn tvix_nix_store<'a>(args: Vec<String>) -> NixResult {
eprintln!("running tvix with arguments {:?}", args);
let mut args = VecDeque::from(args);
args.push_front("tvix-store".to_string());
super::main_args(Vec::from(args))
.unwrap_or_else(|e| panic!("clap command line parsing failed:\n{}", e))
}
#[test]
fn test_nix_store_add() {
let file_content = "I am a copied file";
let mut tempfile = tempfile::NamedTempFile::new().expect("cannot create temp file");
tempfile
.write_all(file_content.as_bytes())
.expect("could not write to tempfile");
assert_eq!(
tvix_nix_store(vec![
"--add".to_string(),
tempfile.path().as_os_str().to_string_lossy().into_owned()
]),
nix_nix_store(vec![
"--add".to_string(),
tempfile.path().as_os_str().to_string_lossy().into_owned()
]),
"added file contents were not the same"
);
// make sure the tempfile lives till here
drop(tempfile)
}
}
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