Use OS provided temporary directory for tests

CHANGELOG.md

@@ -46,6 +46,9 @@
 * Pass along an `ignore` attribute to `unsupported` tests.
   [#4360](https://github.com/rustwasm/wasm-bindgen/pull/4360)
 
+* Use OS provided temporary directory for tests instead of Cargo's `target` directory.
+  [#4361](https://github.com/rustwasm/wasm-bindgen/pull/4361)
+
 --------------------------------------------------------------------------------
 
 ## [0.2.99](https://github.com/rustwasm/wasm-bindgen/compare/0.2.98...0.2.99)

crates/cli/Cargo.toml

@@ -30,6 +30,7 @@ rouille = { version = "3.0.0", default-features = false }
 serde = { version = "1.0", features = ['derive'] }
 serde_derive = "1.0"
 serde_json = "1.0"
+tempfile = "3.0"
 ureq = { version = "2.7", default-features = false, features = ["brotli", "gzip"] }
 walrus = "0.23"
 wasm-bindgen-cli-support = { path = "../cli-support", version = "=0.2.99" }
@@ -40,7 +41,6 @@ assert_cmd = "2"
 diff = "0.1"
 predicates = "3"
 rayon = "1.0"
-tempfile = "3.0"
 wasmparser = "0.214"
 wasmprinter = "0.214"
 

crates/cli/src/bin/wasm-bindgen-test-runner/main.rs

@@ -11,9 +11,8 @@
 //! For more documentation about this see the `wasm-bindgen-test` crate README
 //! and source code.
 
-use anyhow::{anyhow, bail, Context};
+use anyhow::{bail, Context};
 use clap::Parser;
-use log::error;
 use std::env;
 use std::fs;
 use std::path::Path;
@@ -83,32 +82,10 @@ fn main() -> anyhow::Result<()> {
     let file_name = cli
         .file
         .file_name()
-        .and_then(|s| s.to_str())
+        .map(Path::new)
         .context("file to test is not a valid file, can't extract file name")?;
 
-    // wasm_file_to_test may be
-    // - a cargo-like directory layout and generate output at
-    //      `target/wasm32-unknown-unknown/...`
-    // - a tmp directory, generated by rustdoc
-    // we would like a directory we have write access to. if we assume cargo-like directories,
-    // we end up with the path `/wbg-out`
-    let wasm_file_str = cli.file.to_string_lossy();
-    let tmpdir =
-        if wasm_file_str.starts_with("/tmp/rustdoc") || wasm_file_str.starts_with("/var/folders") {
-            cli.file.parent() // chop off the file name and give us the /tmp/rustdoc<hash> directory
-        } else {
-            cli.file
-                .parent() // chop off file name
-                .and_then(|p| p.parent()) // chop off `deps`
-                .and_then(|p| p.parent()) // chop off `debug`
-        }
-        .map(|p| p.join(format!("wbg-tmp-{}", file_name)))
-        .ok_or_else(|| anyhow!("file to test doesn't follow the expected Cargo conventions"))?;
-
-    // Make sure there's no stale state from before
-    drop(fs::remove_dir_all(&tmpdir));
-    fs::create_dir(&tmpdir).context("creating temporary directory")?;
-    let _guard = TmpDirDeleteGuard(tmpdir.clone());
+    let tmpdir = tempfile::tempdir()?;
 
     let module = "wasm-bindgen-test";
 
@@ -247,7 +224,7 @@ fn main() -> anyhow::Result<()> {
         b.split_linked_modules(true);
     }
 
-    let coverage = coverage_args(&tmpdir);
+    let coverage = coverage_args(file_name);
 
     b.debug(debug)
         .input_module(module, wasm)
@@ -259,9 +236,9 @@ fn main() -> anyhow::Result<()> {
 
     match test_mode {
         TestMode::Node { no_modules } => {
-            node::execute(module, &tmpdir, cli, &tests, !no_modules, coverage)?
+            node::execute(module, tmpdir.path(), cli, &tests, !no_modules, coverage)?
         }
-        TestMode::Deno => deno::execute(module, &tmpdir, cli, &tests)?,
+        TestMode::Deno => deno::execute(module, tmpdir.path(), cli, &tests)?,
         TestMode::Browser { .. }
         | TestMode::DedicatedWorker { .. }
         | TestMode::SharedWorker { .. }
@@ -276,7 +253,7 @@ fn main() -> anyhow::Result<()> {
                 },
                 headless,
                 module,
-                &tmpdir,
+                tmpdir.path(),
                 cli,
                 &tests,
                 test_mode,
@@ -350,22 +327,9 @@ impl TestMode {
     }
 }
 
-struct TmpDirDeleteGuard(PathBuf);
-
-impl Drop for TmpDirDeleteGuard {
-    fn drop(&mut self) {
-        if let Err(e) = fs::remove_dir_all(&self.0) {
-            error!("failed to remove temporary directory: {}", e);
-        }
-    }
-}
-
-fn coverage_args(tmpdir: &Path) -> PathBuf {
-    fn generated(tmpdir: &Path, prefix: &str) -> String {
-        let res = format!(
-            "{prefix}{}.profraw",
-            tmpdir.file_name().and_then(|s| s.to_str()).unwrap()
-        );
+fn coverage_args(file_name: &Path) -> PathBuf {
+    fn generated(file_name: &Path, prefix: &str) -> String {
+        let res = format!("{prefix}{}.profraw", file_name.display());
         res
     }
 
@@ -377,10 +341,10 @@ fn coverage_args(tmpdir: &Path) -> PathBuf {
         Some(s) => {
             let mut buf = PathBuf::from(s);
             if buf.is_dir() {
-                buf.push(generated(tmpdir, &prefix));
+                buf.push(generated(file_name, &prefix));
             }
             buf
         }
-        None => PathBuf::from(generated(tmpdir, &prefix)),
+        None => PathBuf::from(generated(file_name, &prefix)),
     }
 }