initial commit

tests/data_lock.rs

@@ -0,0 +1,52 @@
+use rust_xmpp::data_lock::DataDirectoryGuard;
+use std::process::Command;
+
+#[test]
+fn child_process_probe() {
+    let Some(root) = std::env::var_os("XMPP_LOCK_TEST_DIRECTORY") else {
+        return;
+    };
+    let acquired = DataDirectoryGuard::acquire(std::path::Path::new(&root)).is_ok();
+    assert_eq!(
+        acquired,
+        std::env::var("XMPP_LOCK_TEST_AVAILABLE").unwrap() == "yes"
+    );
+}
+
+fn probe(root: &std::path::Path, available: bool) {
+    let output = Command::new(std::env::current_exe().unwrap())
+        .args(["--exact", "child_process_probe", "--nocapture"])
+        .env("XMPP_LOCK_TEST_DIRECTORY", root)
+        .env(
+            "XMPP_LOCK_TEST_AVAILABLE",
+            if available { "yes" } else { "no" },
+        )
+        .output()
+        .unwrap();
+    assert!(
+        output.status.success(),
+        "{}\n{}",
+        String::from_utf8_lossy(&output.stdout),
+        String::from_utf8_lossy(&output.stderr)
+    );
+}
+
+#[test]
+fn excludes_another_process_and_releases_on_drop() {
+    let root = tempfile::tempdir().unwrap();
+    let native = root.path().join("existing-prosody-data");
+    std::fs::write(&native, b"unchanged").unwrap();
+    let guard = DataDirectoryGuard::acquire(root.path()).unwrap();
+    probe(root.path(), false);
+    #[cfg(unix)]
+    {
+        let aliases = tempfile::tempdir().unwrap();
+        let alias = aliases.path().join("same-volume");
+        std::os::unix::fs::symlink(root.path(), &alias).unwrap();
+        probe(&alias, false);
+    }
+    drop(guard);
+    probe(root.path(), true);
+    assert_eq!(std::fs::read(&native).unwrap(), b"unchanged");
+    assert_eq!(std::fs::read_dir(root.path()).unwrap().count(), 1);
+}