[rust] Improve SM tests (WIP)

rust/src/files.rs

@@ -197,8 +197,16 @@ pub fn unzip(
         .into());
     }
 
+    log.debug(format!("**** Deleting {}", compressed_path.display()));
     remove_file(compressed_path)?;
+    log.debug(format!(
+        "**** Copying {} to {} (single file {:?})",
+        tmp_path.display(),
+        final_path.display(),
+        single_file
+    ));
     copy_folder_content(tmp_path, final_path, single_file)?;
+    log.debug("**** Done");
 
     Ok(())
 }

rust/src/main.rs

@@ -15,6 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
+use std::error::Error;
 use std::process::exit;
 
 use clap::Parser;
@@ -206,12 +207,26 @@ fn main() {
                 log.warn(err.to_string());
                 flush_and_exit(OK, log);
             } else {
-                log.error(err.to_string());
+                log_error(&log, err);
                 flush_and_exit(DATAERR, log);
             }
         });
 }
 
+fn log_error(log: &Logger, err: Box<dyn Error>) {
+    let error_message = err.to_string();
+    let source = err.source();
+    if source.is_some() {
+        log.error(format!(
+            "{}. Caused by: {}",
+            error_message,
+            source.unwrap().to_string()
+        ));
+    } else {
+        log.error(error_message);
+    }
+}
+
 fn flush_and_exit(code: i32, log: &Logger) -> ! {
     log.set_code(code);
     log.flush();