datasync: Count error encountered during sync

datasync.py

@@ -16,21 +16,25 @@ from ptblab import terminal
 class Stats:
     def __init__(self):
         self.n_total = 0
+        self.n_errors = 0
         self.n_copied = 0
         self.size_copied = 0
         self.start_time = time.time()
 
-    def update(self, n_total, n_copied, size_copied):
+    def update(self, n_total, n_errors, n_copied, size_copied):
         self.n_total += n_total
+        self.n_errors += n_errors
         self.n_copied += n_copied
         self.size_copied += size_copied
         return self
 
     def __str__(self):
         return \
-            f'copied {self.n_copied} of {self.n_total} files  '\
-            f'{self.size_copied * 1e-6:.3f} MB  ' \
-            f'in {time.time() - self.start_time:.3f} s'
+            f'{self.n_total} files  ' \
+            f'{self.n_errors} errors  ' \
+            f'{self.n_copied} copied  ' \
+            f'{self.size_copied * 1e-6:.3f} MB  in ' \
+            f'{time.time() - self.start_time:.3f} s'
 
 
 def sync(logger, src, dst, recursive, include, exclude, dry_run, prefix=None, stats=None):
@@ -42,6 +46,7 @@ def sync(logger, src, dst, recursive, include, exclude, dry_run, prefix=None, st
 
     t = time.time()
     n_total = 0
+    n_errors = 0
     n_copied = 0
     size_copied = 0
 
@@ -113,6 +118,7 @@ def sync(logger, src, dst, recursive, include, exclude, dry_run, prefix=None, st
             # Ignore ``PermissionError`` obtained when process cannot
             # access the file because it is being used by another process.
             logger.info(f'permission error while copying {entry}')
+            n_errors += 1
             continue
 
         logger.debug(f'moving {tmp_path} to {dst_path}')
@@ -123,7 +129,7 @@ def sync(logger, src, dst, recursive, include, exclude, dry_run, prefix=None, st
 
     logger.info(f'{src}: copied {n_copied} of {n_total} files {size_copied * 1e-6:.3f} Mb in {time.time() - t:.3f} secods')
 
-    return stats.update(n_total, n_copied, size_copied)
+    return stats.update(n_total, n_errors, n_copied, size_copied)
 
 
 def tick(interval):