# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2021-06-09 13:33:58
# Node ID 09ff5d532a256e14f7f230162155d5d4ed97f452
# Parent  d756fc11cfb9deba8f7191995ef42807c53090db

copyfiles: add a way to relax the file system checking for hardlink

This is critical for transaction file, less for hardlink/copy clone as we are
about to do. Since `pure` build does not have a `getfstype` implementation this
would disable hardlink clone for all pure build. So we add a parameter to
control that extra check.

Differential Revision: https://phab.mercurial-scm.org/D10854

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -1917,6 +1917,7 @@ def copyfile(
     checkambig=False,
     nb_bytes=None,
     no_hardlink_cb=None,
+    check_fs_hardlink=True,
 ):
     """copy a file, preserving mode and optionally other stat info like
     atime/mtime
@@ -1935,7 +1936,7 @@ def copyfile(
         if checkambig:
             oldstat = checkambig and filestat.frompath(dest)
         unlink(dest)
-    if hardlink:
+    if hardlink and check_fs_hardlink:
         # Hardlinks are problematic on CIFS (issue4546), do not allow hardlinks
         # unless we are confident that dest is on a whitelisted filesystem.
         try: