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(backup-buffer-copy): Try to overwrite old backup first.

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This commit is contained in:
Martin Rudalics 2007-08-30 08:16:55 +00:00
parent 1bb1f7d38c
commit 0f39d2c98b
2 changed files with 21 additions and 12 deletions
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5
lisp/ChangeLog
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@ -1,3 +1,8 @@
2007-08-30 Martin Rudalics <rudalics@gmx.at>
* files.el (backup-buffer-copy): Try to overwrite old backup
first.
2007-08-29 Martin Rudalics <rudalics@gmx.at>
* repeat.el (repeat): Use last-repeatable-command instead of

28
lisp/files.el
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@ -3127,18 +3127,22 @@ BACKUPNAME is the backup file name, which is the old file renamed."
;; loosen them later, whereas it's impossible to close the
;; time-window of loose permissions otherwise.
(set-default-file-modes ?\700)
(while (condition-case ()
(progn
(and (file-exists-p to-name)
(delete-file to-name))
(copy-file from-name to-name nil t)
nil)
(file-already-exists t))
;; The file was somehow created by someone else between
;; `delete-file' and `copy-file', so let's try again.
;; rms says "I think there is also a possible race
;; condition for making backup files" (emacs-devel 20070821).
nil))
(when (condition-case nil
;; Try to overwrite old backup first.
(copy-file from-name to-name t t)
(error t))
(while (condition-case nil
(progn
(when (file-exists-p to-name)
(delete-file to-name))
(copy-file from-name to-name nil t)
nil)
(file-already-exists t))
;; The file was somehow created by someone else between
;; `delete-file' and `copy-file', so let's try again.
;; rms says "I think there is also a possible race
;; condition for making backup files" (emacs-devel 20070821).
nil)))
;; Reset the umask.
(set-default-file-modes umask)))
(and modes