529ac7fd12
Change-Id: Ic372442c5156f1e13fea28c1b3e57d64e89ba49b Reviewed-on: https://cl.tvl.fyi/c/depot/+/3546 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
110 lines
2.9 KiB
Rust
110 lines
2.9 KiB
Rust
extern crate serde_json;
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use serde_json::Value;
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use std::ffi::OsString;
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use std::os::unix::ffi::{OsStringExt, OsStrExt};
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use std::io::{Error, ErrorKind, Write, stdout, stderr};
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use std::process::Command;
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fn render_nix_string(s: &OsString) -> OsString {
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let mut rendered = Vec::new();
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rendered.extend(b"\"");
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for b in s.as_os_str().as_bytes() {
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match char::from(*b) {
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'\"' => rendered.extend(b"\\\""),
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'\\' => rendered.extend(b"\\\\"),
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'$' => rendered.extend(b"\\$"),
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_ => rendered.push(*b),
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}
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}
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rendered.extend(b"\"");
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OsString::from_vec(rendered)
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}
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fn render_nix_list(arr: &[OsString]) -> OsString {
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let mut rendered = Vec::new();
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rendered.extend(b"[ ");
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for el in arr {
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rendered.extend(render_nix_string(el).as_os_str().as_bytes());
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rendered.extend(b" ");
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}
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rendered.extend(b"]");
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OsString::from_vec(rendered)
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}
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fn main() -> std::io::Result<()> {
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let mut nix_args = Vec::new();
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let mut args = std::env::args_os().into_iter();
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let mut in_args = true;
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let mut argv: Vec<OsString> = Vec::new();
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// skip argv[0]
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args.next();
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loop {
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let arg = match args.next() {
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Some(a) => a,
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None => break,
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};
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if !arg.to_str().map(|s| s.starts_with("-")).unwrap_or(false) {
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in_args = false;
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}
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if in_args {
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match(arg.to_str()) {
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Some("--arg") | Some("--argstr") => {
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nix_args.push(arg);
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nix_args.push(args.next().unwrap());
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nix_args.push(args.next().unwrap());
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Ok(())
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}
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_ => Err(Error::new(ErrorKind::Other, "unknown argument")),
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}?
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} else {
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argv.push(arg);
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}
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}
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if argv.len() < 1 {
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Err(Error::new(ErrorKind::Other, "missing argv"))
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} else {
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let cd = std::env::current_dir()?.into_os_string();
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nix_args.push(OsString::from("--arg"));
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nix_args.push(OsString::from("currentDir"));
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nix_args.push(cd);
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nix_args.push(OsString::from("--arg"));
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nix_args.push(OsString::from("argv"));
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nix_args.push(render_nix_list(&argv[..]));
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nix_args.push(OsString::from("--eval"));
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nix_args.push(OsString::from("--json"));
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nix_args.push(argv[0].clone());
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let run = Command::new("nix-instantiate")
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.args(nix_args)
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.output()?;
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match serde_json::from_slice(&run.stdout[..]) {
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Ok(Value::String(s)) => stdout().write_all(s.as_bytes()),
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Ok(_) => Err(Error::new(ErrorKind::Other, "output must be a string")),
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_ => {
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stderr().write_all(&run.stderr[..]);
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Err(Error::new(ErrorKind::Other, "internal nix error"))
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},
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}
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}
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}
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