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Re: yes I'm root but want 444 files found readonly
From: |
Jeff Sheinberg |
Subject: |
Re: yes I'm root but want 444 files found readonly |
Date: |
01 Jul 2002 21:31:51 -0400 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 |
jidanni@dman.ddts.net (Dan Jacobson) writes:
> and the files are found without the "%%" readonly in the mode line.
>
> OK, I'm root with the royal blood. But that doesn't mean I don't want
> to enjoy the same protection against altering my files all over the
> place just like the other guy. Sure wish there was an option in emacs
> that would respect the hints from the file modes even if I'm root. Or
> what, do you expect me to do C-x C-q on each file? Unfair.
>
> Yes, for my mode 0 file the option could have a third etc. choice, not
> only find-readonly, but also ask the user if he really wants to see it
> etc.
Greetings Zen Master "jidanni",
See below for a sample implementation that finds such files in
read-only mode. IMO, there is no need for prompting, since %%
shows in the mode line, and C-x C-q will easily toggle read-only
off when and if desired.
> Also there's the case of 444 but not owned by root. Here also I would
> find-readonly.
My version of Emacs (GNU Emacs 21.2.1) already finds files with
mode 444 read-only, just like versions 18, 19, and 20 did.
;;----------------------------------------------------------------------
;; Put buffer in read-only mode if there are no write bits set in the
;; file's mode. This can occur when uid=0 edits a non-writable file.
(defun my-set-read-only-if-no-writeable-mode-bits ()
"This function is used to warn the super-user that the current buffer
has been set read-only because none of the file's write mode bits
are set."
(interactive)
(let* ((file (buffer-file-name))
(mode (file-modes file)))
(if mode
(progn
(if (and (not buffer-read-only)
(file-writable-p file)
(= (logand mode 146) 0)) ; 146 decimal is 222 octal.
(progn
(setq buffer-read-only t)
(ding)
(message "File's mode is %o, buffer set read-only, use
`toggle-read-only' wisely!" mode)))))))
(add-hook 'find-file-hooks 'my-set-read-only-if-no-writeable-mode-bits)
;; Put all buffers in `/usr/share/*' hierarchy in read-only mode.
(defun my-set-read-only-usr-share-files ()
"This function is used to warn the user that the current buffer has
been set read-only because the file being visited is in the
`/usr/share/*' hierarchy."
(interactive)
(let* ((dir "/usr/share/")
(len (- (length dir) 1)))
(if (and (not buffer-read-only)
(stringp buffer-file-truename)
(file-writable-p buffer-file-truename)
(fboundp 'compare-strings) ; keep emacs-19 happy
(eq t
(compare-strings dir 0 len buffer-file-truename 0 len)))
(progn
(setq buffer-read-only t)
(ding)
(message "Buffer %s set read-only, use `toggle-read-only' wisely!"
(buffer-name))))))
(add-hook 'find-file-hooks 'my-set-read-only-usr-share-files)
;;----------------------------------------------------------------------
HTH,
--
Jeff Sheinberg <jeffsh@erols.com>