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bug#29225: Tramp backup-by-copying in a Converting ACL Invalid argument


From: Shuguang Sun
Subject: bug#29225: Tramp backup-by-copying in a Converting ACL Invalid argument error on Windows 7
Date: Thu, 9 Nov 2017 16:24:39 +0800

Hi,

Windows 7
GNU Emacs 26.0.50 (build 1, x86_64-w64-mingw32) of 2017-08-27
(backup-by-copying t)

When I tramp to a host (linux) and edit a file, and save it, I get an error about the backup as below. The ACL is in different format on Linus and on Windows. It is "user::..." on linux, however, it looks like "O:S-1-5-21-" on windows.

Could we allow the user to set whether to copy ACl for certain type of files?

Debugger entered--Lisp error: (file-error "Converting ACL" "Invalid argument" "c:/Users/user/HOME/.emacs.d/autosave/Rfiles/address@hidden")
  set-file-acl("c:/Users/user/HOME/.emacs.d/autosave/Rfiles/address@hidden" "user::rw-\ngroup::rw-\nother::r--\n")
  set-file-extended-attributes("c:/Users/user/HOME/.emacs.d/autosave/Rfiles/address@hidden" ((acl . "user::rw-\ngroup::rw-\nother::r--\n") (selinux-context nil nil nil nil)))
  backup-buffer-copy("/plink:address@hidden:/path/user/Ava/_mortality.R" "c:/Users/user/HOME/.emacs.d/autosave/Rfiles/address@hidden" 436 ((acl . "user::rw-\ngroup::rw-\nother::r--\n") (selinux-context nil nil nil nil)))
  backup-buffer()
  basic-save-buffer-2()
  basic-save-buffer-1()
  basic-save-buffer(t)
  save-buffer(1)
  funcall-interactively(save-buffer 1)
  call-interactively(save-buffer nil nil)
  command-execute(save-buffer)

Best Regards,
Shuguang


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