test(cli): ensure the resolution of #3344

tests/suite/cli_misc.rs

@@ -702,6 +702,33 @@ fn toolchains_symlink() {
     });
 }
 
+// issue #3344
+/// `~/.rustup/tmp` and `~/.rustup/downloads` are permitted to be symlinks.
+#[test]
+#[cfg(any(unix, windows))]
+fn tmp_downloads_symlink() {
+    use rustup::utils::raw::symlink_dir;
+    use std::fs;
+
+    clitools::test(Scenario::ArchivesV2, &|config| {
+        let cwd = config.current_dir();
+
+        let test_tmp = cwd.join("tmp-test");
+        fs::create_dir(&test_tmp).unwrap();
+        symlink_dir(&test_tmp, &config.rustupdir.join("tmp")).unwrap();
+
+        let test_downloads = cwd.join("tmp-downloads");
+        fs::create_dir(&test_downloads).unwrap();
+        symlink_dir(&test_downloads, &config.rustupdir.join("downloads")).unwrap();
+
+        set_current_dist_date(config, "2015-01-01");
+        config.expect_ok(&["rustup", "default", "nightly"]);
+
+        set_current_dist_date(config, "2015-01-02");
+        config.expect_ok(&["rustup", "update"]);
+    });
+}
+
 // issue #1169
 /// A toolchain that is a stale symlink should be correctly uninstalled.
 #[test]