Migrate run-make/rustdoc-io-error to rmake.rs

tests/run-make/rustdoc-io-error/rmake.rs

@@ -0,0 +1,26 @@
+// This test verifies that rustdoc doesn't ICE when it encounters an IO error
+// while generating files. Ideally this would be a rustdoc-ui test, so we could
+// verify the error message as well.
+//
+// It operates by creating a temporary directory and modifying its
+// permissions so that it is not writable. We have to take special care to set
+// the permissions back to normal so that it's able to be deleted later.
+
+use run_make_support::{rustdoc, tmp_dir};
+use std::fs;
+
+fn main() {
+    let out_dir = tmp_dir().join("rustdoc-io-error");
+    let output = fs::create_dir(&out_dir).unwrap();
+    let mut permissions = fs::metadata(&out_dir).unwrap().permissions();
+    permissions.set_readonly(true);
+    fs::set_permissions(&out_dir, permissions).unwrap();
+
+    let output = rustdoc().input("foo.rs").output(&out_dir).command_output();
+    #[cfg(not(windows))]
+    assert_eq!(output.status.code().unwrap(), 1);
+    assert!(!output.status.success());
+    let stderr = String::from_utf8(output.stderr).unwrap();
+
+    assert!(stderr.contains("error: couldn't generate documentation: Permission denied"));
+}