Warn if project path contains an invalid PATH env character

src/cargo/ops/cargo_new.rs

@@ -261,6 +261,18 @@ fn check_name(
     Ok(())
 }
 
+/// Checks if the path contains any invalid PATH env characters.
+fn check_path(path: &Path, shell: &mut Shell) -> CargoResult<()> {
+    if path.to_string_lossy().contains(&[';', ':', '"'][..]) {
+        shell.warn(format!(
+            "the path `{}` contains invalid PATH characters (usually `:`, `;`, or `\"`)\n\
+            It is recommended to use a different name to avoid problems.",
+            path.to_string_lossy()
+        ))?;
+    }
+    Ok(())
+}
+
 fn detect_source_paths_and_types(
     package_path: &Path,
     package_name: &str,
@@ -421,6 +433,8 @@ pub fn new(opts: &NewOptions, config: &Config) -> CargoResult<()> {
         )
     }
 
+    check_path(path, &mut config.shell())?;
+
     let is_bin = opts.kind.is_bin();
 
     let name = get_name(path, opts)?;
@@ -458,6 +472,8 @@ pub fn init(opts: &NewOptions, config: &Config) -> CargoResult<NewProjectKind> {
         anyhow::bail!("`cargo init` cannot be run on existing Cargo packages")
     }
 
+    check_path(path, &mut config.shell())?;
+
     let name = get_name(path, opts)?;
 
     let mut src_paths_types = vec![];

tests/testsuite/init/mod.rs

@@ -28,6 +28,7 @@ mod mercurial_autodetect;
 mod multibin_project_name_clash;
 #[cfg(not(windows))]
 mod no_filename;
+mod path_contains_separator;
 mod pijul_autodetect;
 mod reserved_name;
 mod simple_bin;

tests/testsuite/init/path_contains_separator/in/test:ing/mod.rs

@@ -0,0 +1,7 @@
+use cargo_test_support::compare::assert_ui;
+use cargo_test_support::prelude::*;
+use cargo_test_support::{command_is_available, paths, Project};
+use std::fs;
+use std::process::Command;
+
+use crate::test_root;

tests/testsuite/init/path_contains_separator/mod.rs

@@ -0,0 +1,22 @@
+use cargo_test_support::compare::assert_ui;
+use cargo_test_support::prelude::*;
+use cargo_test_support::Project;
+
+use cargo_test_support::curr_dir;
+
+#[cargo_test]
+fn path_contains_separator() {
+    let project = Project::from_template(curr_dir!().join("in"));
+    let project_root = &project.root().join("test:ing");
+
+    snapbox::cmd::Command::cargo_ui()
+        .arg_line("init --bin --vcs none --edition 2015 --name testing")
+        .current_dir(project_root)
+        .assert()
+        .success()
+        .stdout_matches_path(curr_dir!().join("stdout.log"))
+        .stderr_matches_path(curr_dir!().join("stderr.log"));
+
+    assert_ui().subset_matches(curr_dir!().join("out"), project_root);
+    assert!(!project_root.join(".gitignore").is_file());
+}

tests/testsuite/init/path_contains_separator/out/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "testing"
+version = "0.1.0"
+edition = "2015"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

tests/testsuite/init/path_contains_separator/out/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

tests/testsuite/init/path_contains_separator/stderr.log

@@ -0,0 +1,3 @@
+warning: the path `[ROOT]/case/test:ing/.` contains PATH separators (usually `:` or `:`)
+It is recommended to use a different name to avoid problems.
+     Created binary (application) package

tests/testsuite/new.rs

@@ -529,3 +529,17 @@ Caused by:
         )
         .run();
 }
+
+#[cfg(unix)]
+#[cargo_test]
+fn path_with_invalid_character() {
+    cargo_process("new --name testing test:ing")
+        .with_stderr(
+            "\
+[WARNING] the path `[CWD]/test:ing` contains invalid PATH characters (usually `:`, `;`, or `\"`)
+It is recommended to use a different name to avoid problems.
+[CREATED] binary (application) `testing` package
+",
+        )
+        .run();
+}