test(script): Verify use with memfd

Author: epage

Cargo.lock

@@ -67,6 +67,7 @@ libc = "0.2.177"
 libgit2-sys = "0.18.2"
 libloading = "0.8.9"
 memchr = "2.7.6"
+memfd = "0.6.5"
 miow = "0.6.1"
 opener = "0.8.3"
 openssl = "0.10.74"
@@ -261,6 +262,9 @@ gix-transport = { version = "0.49.1", features = ["http-client-insecure-credenti
 same-file.workspace = true
 snapbox.workspace = true
 
+[target.'cfg(target_os = "linux")'.dev-dependencies]
+memfd.workspace = true
+
 [build-dependencies]
 flate2.workspace = true
 tar.workspace = true

Cargo.toml

@@ -1,4 +1,5 @@
 use std::fs;
+use std::io::Write;
 
 use crate::prelude::*;
 use cargo_test_support::basic_manifest;
@@ -2174,3 +2175,37 @@ args: []
 "#]])
         .run();
 }
+
+#[cargo_test(nightly, reason = "-Zscript is unstable")]
+#[cfg(target_os = "linux")]
+fn memfd_script() {
+    use std::os::fd::AsRawFd;
+
+    let fd = memfd::MemfdOptions::new()
+        .close_on_exec(false)
+        .create("otkeep-script")
+        .unwrap();
+    let mut file = fd.into_file();
+    file.write_all(ECHO_SCRIPT.as_bytes()).unwrap();
+    file.flush().unwrap();
+
+    let raw_fd = file.as_raw_fd();
+
+    let p = cargo_test_support::project()
+        .file("echo.rs", ECHO_SCRIPT)
+        .build();
+
+    p.cargo(&format!("-Zscript -v /proc/self/fd/{raw_fd}"))
+        .masquerade_as_nightly_cargo(&["script"])
+        .with_status(101)
+        .with_stdout_data(str![""])
+        .with_stderr_data(str![[r#"
+[WARNING] `package.edition` is unspecified, defaulting to `2024`
+
+thread 'main' ([..]) panicked at src/cargo/core/workspace.rs:465:18:
+template is correct: [NOT_FOUND]
+[NOTE] run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+
+"#]])
+        .run();
+}