Check whether TmpGitNamespace request path exists before removing (#1316)

When TmpGitNamespace is dropped before any filtering / git work is done,
for example due to an unrelated error, it will attempt to remove
directory that doesn't exist because no code that actually uses the
namespace path has run. This adds a check before remove_dir_all call to
prevent tracing spam.

commit-id:9feb11b7

Author: vlad-ivanov-name

josh-proxy/src/lib.rs

@@ -799,14 +799,18 @@ impl Drop for TmpGitNamespace {
         if std::env::var_os("JOSH_KEEP_NS").is_some() {
             return;
         }
+
         let request_tmp_namespace = self.repo_path.join("refs/namespaces").join(&self.name);
-        std::fs::remove_dir_all(&request_tmp_namespace).unwrap_or_else(|e| {
-            tracing::error!(
-                "remove_dir_all {:?} failed, error:{:?}",
-                request_tmp_namespace,
-                e
-            )
-        });
+
+        if std::path::Path::new(&request_tmp_namespace).exists() {
+            fs::remove_dir_all(&request_tmp_namespace).unwrap_or_else(|err| {
+                tracing::error!(
+                    "remove_dir_all {} failed, error: {}",
+                    request_tmp_namespace.display(),
+                    err
+                )
+            });
+        }
     }
 }