shutil: ignore errors from copystat in copy2;

ntfs on linux can be picky about cloning mtime onto a new file;
generally we don't care if that fails, however, we also want the
speedup that CopyFile2 can offer, so cannot use copyfile directly

this avoids the following issue:

up2k:3537 <_symlink>: shutil.copy2(fsenc(csrc), fsenc(dst))
shutil:437 <copy2>: copystat(src, dst, follow_symlinks=follow_sym[...]
shutil:376 <copystat>: lookup("utime")(dst, ns=(st.st_atime_ns, s[...]
[PermissionError] [Errno 1] Operation not permitted, '/windows/videos'

copyparty/up2k.py

@@ -60,6 +60,7 @@ from .util import (
     sfsenc,
     spack,
     statdir,
+    trystat_shutil_copy2,
     ub64enc,
     unhumanize,
     vjoin,
@@ -2768,7 +2769,7 @@ class Up2k(object):
         cur.close()
         db.close()
 
-        shutil.copy2(fsenc(db_path), fsenc(bak))
+        trystat_shutil_copy2(self.log, fsenc(db_path), fsenc(bak))
         return self._orz(db_path)
 
     def _read_ver(self, cur: "sqlite3.Cursor") -> Optional[int]:
@@ -3591,7 +3592,7 @@ class Up2k(object):
                 t = "BUG: no valid sources to link from! orig(%r) fsrc(%r) link(%r)"
                 self.log(t, 1)
                 raise Exception(t % (src, fsrc, dst))
-            shutil.copy2(fsenc(csrc), fsenc(dst))
+            trystat_shutil_copy2(self.log, fsenc(csrc), fsenc(dst))
 
         if lmod and (not linked or SYMTIME):
             bos.utime_c(self.log, dst, int(lmod), False)
@@ -4427,7 +4428,7 @@ class Up2k(object):
             b1, b2 = fsenc(sabs), fsenc(dabs)
             is_link = os.path.islink(b1)  # due to _relink
             try:
-                shutil.copy2(b1, b2)
+                trystat_shutil_copy2(self.log, b1, b2)
             except:
                 try:
                     wunlink(self.log, dabs, dvn.flags)
@@ -4733,7 +4734,7 @@ class Up2k(object):
             b1, b2 = fsenc(sabs), fsenc(dabs)
             is_link = os.path.islink(b1)  # due to _relink
             try:
-                shutil.copy2(b1, b2)
+                trystat_shutil_copy2(self.log, b1, b2)
             except:
                 try:
                     wunlink(self.log, dabs, dvn.flags)

copyparty/util.py

@@ -2639,6 +2639,24 @@ def set_fperms(f: Union[typing.BinaryIO, typing.IO[Any]], vf: dict[str, Any]) ->
         os.fchown(fno, vf["uid"], vf["gid"])
 
 
+def trystat_shutil_copy2(log: "NamedLogger", src: bytes, dst: bytes) -> bytes:
+    try:
+        return shutil.copy2(src, dst)
+    except:
+        # ignore failed mtime on linux+ntfs; for example:
+        # shutil.py:437 <copy2>: copystat(src, dst, follow_symlinks=follow_symlinks)
+        # shutil.py:376 <copystat>: lookup("utime")(dst, ns=(st.st_atime_ns, st.st_mtime_ns),
+        # [PermissionError] [Errno 1] Operation not permitted, '/windows/_videos'
+        _, _, tb = sys.exc_info()
+        for _, _, fun, _ in traceback.extract_tb(tb):
+            if fun == "copystat":
+                if log:
+                    t = "warning: failed to retain some file attributes (timestamp and/or permissions) during copy from %r to %r:\n%s"
+                    log(t % (src, dst, min_ex()), 3)
+                return dst  # close enough
+        raise
+
+
 def _fs_mvrm(
     log: "NamedLogger", src: str, dst: str, atomic: bool, flags: dict[str, Any]
 ) -> bool: