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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| use std::convert::Infallible; | ||
| use std::{ | ||
| ffi::OsString, | ||
| process::{Command, ExitCode, ExitStatus}, | ||
| }; | ||
|
|
||
| /// Spawns a command exec style. | ||
| fn exec_spawn(cmd: &mut Command) -> std::io::Result<Infallible> { | ||
| #[cfg(unix)] | ||
| { | ||
| use std::os::unix::process::CommandExt; | ||
| let err = cmd.exec(); | ||
| Err(err) | ||
| } | ||
| #[cfg(windows)] | ||
| { | ||
| cmd.stdin(std::process::Stdio::inherit()); | ||
| let status = cmd.status()?; | ||
|
|
||
| #[allow(clippy::exit)] | ||
| std::process::exit(status.code().unwrap()) | ||
| } | ||
| } | ||
|
|
||
| #[derive(Debug)] | ||
| enum Error { | ||
| Io(std::io::Error), | ||
| Which(which::Error), | ||
| NoInterpreter(String), | ||
| RecursiveQuery, | ||
| } | ||
|
|
||
| #[derive(Debug, Default)] | ||
| struct Options { | ||
| request: Option<String>, | ||
| system: bool, | ||
| managed: bool, | ||
| } | ||
|
|
||
| impl Options { | ||
| fn as_args(&self) -> Vec<&str> { | ||
| let mut args = Vec::new(); | ||
| if let Some(request) = &self.request { | ||
| args.push(request.as_str()); | ||
| } else { | ||
| // By default, we should never select an alternative implemenation with the shim | ||
| args.push("cpython"); | ||
| } | ||
| if self.system { | ||
| args.push("--system"); | ||
| } | ||
| if self.managed { | ||
| args.push("--python-preference"); | ||
| args.push("only-managed"); | ||
| } | ||
| args | ||
| } | ||
| } | ||
|
|
||
| impl std::fmt::Display for Error { | ||
| fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result { | ||
| match self { | ||
| Self::Io(err) => write!(f, "{err}"), | ||
| Self::Which(err) => write!(f, "Failed to find uv binary: {err}"), | ||
| Self::NoInterpreter(inner) => write!(f, "{inner}"), | ||
| Self::RecursiveQuery => write!(f, "Ignoring recursive query from uv"), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Parse `+<option>` into [`Options`]. | ||
| /// | ||
| /// Supports the following options: | ||
| /// | ||
| /// - `+system`: Use the system Python, ignore virtual environments. | ||
| /// - `+managed`: Use only managed Python installations. | ||
| /// - `+<request>`: Request a Python version | ||
| fn parse_options(mut args: Vec<OsString>) -> (Vec<OsString>, Options) { | ||
| let mut position = 0; | ||
| let mut options = Options::default(); | ||
| while position < args.len() { | ||
| let arg = &args[position].to_string_lossy(); | ||
|
|
||
| // If the argument doesn't start with `+`, we're done. | ||
| let Some(option) = arg.strip_prefix('+') else { | ||
| break; | ||
| }; | ||
|
|
||
| match option { | ||
| "system" => options.system = true, | ||
| "managed" => options.managed = true, | ||
| _ => options.request = Some(option.to_string()), | ||
| } | ||
|
|
||
| position += 1; | ||
| } | ||
|
|
||
| (args.split_off(position), options) | ||
| } | ||
|
|
||
| /// Find the `uv` binary to use. | ||
| fn find_uv() -> Result<std::path::PathBuf, Error> { | ||
| // We prefer one next to the current binary. | ||
| let current_exe = std::env::current_exe().map_err(Error::Io)?; | ||
| if let Some(bin) = current_exe.parent() { | ||
| let uv = bin.join("uv"); | ||
| if uv.exists() { | ||
| return Ok(uv); | ||
| } | ||
| } | ||
| // Otherwise, we'll search for it on the `PATH`. | ||
| which::which("uv").map_err(Error::Which) | ||
| } | ||
|
|
||
| fn run() -> Result<ExitStatus, Error> { | ||
| if std::env::var_os("UV_INTERNAL__PYTHON_QUERY").is_some() { | ||
| return Err(Error::RecursiveQuery); | ||
| } | ||
|
|
||
| let args = std::env::args_os().skip(1).collect::<Vec<_>>(); | ||
| let (args, options) = parse_options(args); | ||
| let uv = find_uv()?; | ||
| let mut cmd = Command::new(uv); | ||
| let uv_args = ["python", "find"].iter().copied().chain(options.as_args()); | ||
| cmd.args(uv_args); | ||
| let output = cmd.output().map_err(Error::Io)?; | ||
| if !output.status.success() { | ||
| let stderr = String::from_utf8_lossy(output.stderr.as_slice()); | ||
| return Err(Error::NoInterpreter( | ||
| stderr | ||
| .strip_prefix("error: ") | ||
| .unwrap_or(&*stderr) | ||
| .to_string(), | ||
| )); | ||
| } | ||
| let python = std::path::PathBuf::from(String::from_utf8_lossy(output.stdout.as_slice()).trim()); | ||
| let mut cmd = Command::new(python); | ||
| cmd.args(&args); | ||
| match exec_spawn(&mut cmd).map_err(Error::Io)? {} | ||
| } | ||
|
|
||
| #[allow(clippy::print_stderr)] | ||
| fn main() -> ExitCode { | ||
| let result = run(); | ||
| match result { | ||
| // Fail with 2 if the status cannot be cast to an exit code | ||
| Ok(status) => u8::try_from(status.code().unwrap_or(2)).unwrap_or(2).into(), | ||
| Err(err) => { | ||
| eprintln!("error: {err}"); | ||
| ExitCode::from(2) | ||
| } | ||
| } | ||
| } | ||
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