roverlay/util/common: try_unlink()

Remove a file if it exists and ignore errors caused by non-existence.

1 files changed, 17 insertions, 1 deletions

diff --git a/roverlay/util/common.py b/roverlay/util/common.py
index a2c155a..f27593a 100644
--- a/roverlay/util/common.py
+++ b/roverlay/util/common.py
@@ -8,9 +8,10 @@
 
 __all__= [
    'dodir', 'for_all_files', 'get_dict_hash', 'keepenv', 'priosort', 'sysnop',
-   'getsize', 'is_vcs_dir', 'headtail'
+   'getsize', 'is_vcs_dir', 'headtail', 'try_unlink',
 ]
 
+import errno
 import os
 import sys
 import logging
@@ -26,6 +27,21 @@ def headtail ( iterable ):
    return ( iterable[0], iterable[1:] )
 # --- end of headtail #py2 (...) ---
 
+def try_unlink ( fspath ):
+   """Tries to remove a file. Does not fail if the file did not exist.
+
+   arguments:
+   * fspath --
+   """
+   try:
+      os.unlink ( fspath )
+   except OSError as oserr:
+      if oserr.errno == errno.ENOENT:
+         pass
+      else:
+         raise
+# --- end of try_unlink (...) ---
+
 def for_all_files (
    files_or_dirs, func,
    args=(), kwargs={}, file_filter=None, ignore_missing=False