gnulib-tool.py: Avoid errors when writing to a VFAT file system.

* pygnulib/constants.py (copyfile, copyfile2): New functions.
* gnulib-tool.py: Use them instead of shutil.
* pygnulib/*.py: Likewise.

1 files changed, 22 insertions, 0 deletions

diff --git a/pygnulib/constants.py b/pygnulib/constants.py
index 91a2958eb3..cf6f05eb98 100644
--- a/pygnulib/constants.py
+++ b/pygnulib/constants.py
@@ -23,6 +23,7 @@ import re
 import os
 import sys
 import platform
+import shutil
 import tempfile
 import subprocess as sp
 import __main__ as interpreter
@@ -303,6 +304,27 @@ def relconcat(dir1, dir2):
     return os.path.normpath(os.path.join(dir1, dir2))
 
 
+def copyfile(src, dest):
+    '''Copy file src to file dest. Like shutil.copy, but ignore errors e.g. on
+    VFAT file systems.'''
+    shutil.copyfile(src, dest)
+    try:
+        shutil.copymode(src, dest)
+    except PermissionError:
+        pass
+
+
+def copyfile2(src, dest):
+    '''Copy file src to file dest, preserving modification time. Like
+    shutil.copy2, but ignore errors e.g. on VFAT file systems. This function
+    is to be used for backup files.'''
+    shutil.copyfile(src, dest)
+    try:
+        shutil.copystat(src, dest)
+    except PermissionError:
+        pass
+
+
 def link_relative(src, dest):
     '''Like ln -s, except that src is given relative to the current directory
     (or absolute), not given relative to the directory of dest.'''