Merge #713

713: Convert --target-dir to use absolute paths. r=Emilgardis a=Alexhuszagh

Converts relative target directories to absolute paths, to avoid creating the target directory in the sysroot. This keeps the prior behavior if the provided target directory is an absolute path.

Fixes #581.

Co-authored-by: Alex Huszagh <ahuszagh@gmail.com>

CHANGELOG.md

@@ -5,6 +5,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+- #713 - convert relative target directories to absolute paths.
 - #709 - Update Emscripten targets to `emcc` version 3.1.10
 - #707, #708 - Set `BINDGEN_EXTRA_CLANG_ARGS` environment variable to pass sysroot to `rust-bindgen`
 - #696 - bump freebsd to 12.3

src/cli.rs

@@ -2,6 +2,7 @@ use std::str::FromStr;
 use std::{env, path::PathBuf};
 
 use crate::cargo::Subcommand;
+use crate::errors::Result;
 use crate::rustc::TargetList;
 use crate::Target;
 
@@ -15,7 +16,16 @@ pub struct Args {
     pub docker_in_docker: bool,
 }
 
-pub fn parse(target_list: &TargetList) -> Args {
+// Fix for issue #581. target_dir must be absolute.
+fn absolute_path(path: PathBuf) -> Result<PathBuf> {
+    Ok(if path.is_absolute() {
+        path
+    } else {
+        env::current_dir()?.join(path)
+    })
+}
+
+pub fn parse(target_list: &TargetList) -> Result<Args> {
     let mut channel = None;
     let mut target = None;
     let mut target_dir = None;
@@ -44,12 +54,12 @@ pub fn parse(target_list: &TargetList) -> Args {
             } else if arg == "--target-dir" {
                 all.push(arg);
                 if let Some(td) = args.next() {
-                    target_dir = Some(PathBuf::from(&td));
+                    target_dir = Some(absolute_path(PathBuf::from(&td))?);
                     all.push("/target".to_string());
                 }
             } else if arg.starts_with("--target-dir=") {
                 if let Some((_, td)) = arg.split_once('=') {
-                    target_dir = Some(PathBuf::from(&td));
+                    target_dir = Some(absolute_path(PathBuf::from(&td))?);
                     all.push("--target-dir=/target".into());
                 }
             } else {
@@ -66,12 +76,12 @@ pub fn parse(target_list: &TargetList) -> Args {
         .map(|s| bool::from_str(&s).unwrap_or_default())
         .unwrap_or_default();
 
-    Args {
+    Ok(Args {
         all,
         subcommand: sc,
         channel,
         target,
         target_dir,
         docker_in_docker,
-    }
+    })
 }

src/main.rs

@@ -263,7 +263,7 @@ pub fn main() -> Result<()> {
 
 fn run() -> Result<ExitStatus> {
     let target_list = rustc::target_list(false)?;
-    let args = cli::parse(&target_list);
+    let args = cli::parse(&target_list)?;
 
     if args.all.iter().any(|a| a == "--version" || a == "-V") && args.subcommand.is_none() {
         println!(