GNU bug report logs - #6995
24.0.50; get-free-disk-space doesn't return available space in dired

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.50; get-free-disk-space doesn't return available space in dired
Date: Tue, 07 Sep 2010 21:40:42 +0200

Hi,
The version of get-free-disk-space doesn't show available space in
dired, please fix it or revert to 23.2 version.

Actually it show:
total 10120

instead of:
total used in directory 9,9M available 24G

BTW the bug i sent long time ago (with a patch) about insert-directory
that doesn't show correctly available space when using h option of ls
is still not fixed.
e.g it should show something like:

total used in directory 9,9M available 24G
                                       ^^^


In GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2010-09-07 on tux
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
configured using `configure  '--prefix=/usr' '--build=i686-pc-linux-gnu' '--host=i686-pc-linux-gnu' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' '--localstatedir=/var/lib' '--program-suffix=-emacs-24' '--infodir=/usr/share/info/emacs-24' '--with-crt-dir=/usr/lib' '--without-compress-info' '--with-sound' '--with-x' '--without-gconf' '--without-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xpm' '--without-imagemagick' '--with-xft' '--without-libotf' '--without-m17n-flt' '--with-x-toolkit=gtk' '--without-hesiod' '--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus' 'build_alias=i686-pc-linux-gnu' 'host_alias=i686-pc-linux-gnu' 'CFLAGS=-march=i686 -pipe -O2' 'LDFLAGS=-Wl,-O1 -Wl,--as-needed''

Important settings:
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  value of $LC_COLLATE: C
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Major mode: Emacs-Lisp

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-- 
Thierry Volpiatto
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

Message #8 received at 6995 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
Cc: 6995 <at> debbugs.gnu.org
Subject: Re: bug#6995: 24.0.50;
	get-free-disk-space doesn't return available space in dired
Date: Tue, 07 Sep 2010 16:36:01 -0400

Thierry Volpiatto wrote:

> The version of get-free-disk-space doesn't show available space in
> dired, please fix it or revert to 23.2 version.
>
> Actually it show:
> total 10120
>
> instead of:
> total used in directory 9,9M available 24G

Allow me to offer more details:

On my system, where my home directory is NFS mounted,

   df -Pk /home/user

returns

  Filesystem         1024-blocks      Used Available Capacity Mounted on
  /real_directory/home/user 461097104 333392304 127704800      73% /home/user

Because the filesystem name is long, the numerical values do not line
up with the column headings. The current code seems to assume that
they do line up. Thus, running dired on "~" gets wrong values for the
total size. 

Message #11 received at 6995 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 6995 <at> debbugs.gnu.org, thierry.volpiatto <at> gmail.com
Subject: Re: bug#6995: 24.0.50;
	get-free-disk-space doesn't return available space in dired
Date: Mon, 13 Sep 2010 08:56:19 +0200

> From: Glenn Morris <rgm <at> gnu.org>
> Date: Tue, 07 Sep 2010 16:36:01 -0400
> Cc: 6995 <at> debbugs.gnu.org
> 
>    df -Pk /home/user
> 
> returns
> 
>   Filesystem         1024-blocks      Used Available Capacity Mounted on
>   /real_directory/home/user 461097104 333392304 127704800      73% /home/user
> 
> Because the filesystem name is long, the numerical values do not line
> up with the column headings. The current code seems to assume that
> they do line up. Thus, running dired on "~" gets wrong values for the
> total size. 

How about dropping the use of `df', at least on GNU/Linux?  It's IMO
ridiculous to invoke an external program for a single system call.  I
know that this system call is notoriously non-portable, and that doing
in Emacs all that system-dependent stuff that `df' does is not a good
idea.  But at least on the most popular free system (and perhaps on a
few compatible ones) we could do it right without all that labor, and
gain stability and reliability that depending on `df' will never
achieve.

Message #14 received at 6995 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Glenn Morris <rgm <at> gnu.org>, 6995 <at> debbugs.gnu.org,
	thierry.volpiatto <at> gmail.com
Subject: Re: bug#6995: 24.0.50;
	get-free-disk-space doesn't return available space in dired
Date: Mon, 13 Sep 2010 12:14:56 +0200

> How about dropping the use of `df', at least on GNU/Linux?  It's IMO
> ridiculous to invoke an external program for a single system call.  I
> know that this system call is notoriously non-portable, and that doing
> in Emacs all that system-dependent stuff that `df' does is not a good
> idea.  But at least on the most popular free system (and perhaps on a
> few compatible ones) we could do it right without all that labor, and
> gain stability and reliability that depending on `df' will never
> achieve.

That would make a lot of sense, yes,


        Stefan

Message #17 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#6995: 24.0.50;
	get-free-disk-space doesn't return available space in dired
Date: Mon, 13 Sep 2010 15:22:17 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> How about dropping the use of `df', at least on GNU/Linux?  It's IMO
>> ridiculous to invoke an external program for a single system call.  I
>> know that this system call is notoriously non-portable, and that doing
>> in Emacs all that system-dependent stuff that `df' does is not a good
>> idea.  But at least on the most popular free system (and perhaps on a
>> few compatible ones) we could do it right without all that labor, and
>> gain stability and reliability that depending on `df' will never
>> achieve.
>
> That would make a lot of sense, yes,

I agree too, but waiting such a change, you should rewrite
`get-free-disk-space' as it can't work correctly on the output of df.

,----
| 	    ;; Usual format is as follows:
| 	    ;; Filesystem ...    Used  Available  Capacity ...
| 	    ;; /dev/sda6  ...48106535   35481255  10669850 ...
| 	    (goto-char (point-min))
| 	    (when (re-search-forward " +Avail[^ \n]*"
`----

But usual format is not the same on all locales:
Here it is:

,----
| Sys. de fichiers    1024-blocs   Utilisé    Dispo. Capacité Monté sur
| /dev/sda7             48947688  21618816  24842416      47% /home
`----

So (re-search-forward " +Avail[^ \n]*" is not portable here.

I use this simplified version of get-free-disk-space if it can help:

,----
| (defun get-free-disk-space (dir)
|   (let* ((data   (with-temp-buffer
|                    (call-process directory-free-space-program
|                                  nil t nil
|                                  directory-free-space-args
|                                  dir)
|                    (split-string (buffer-string) "\n" t)))
|          (values (cdr (split-string (second data)))))
|     (nth 2 values)))
`----

Tough the version on 23.2 work also.

Note that the value of "total used in directory" is always wrong.
How do you get this value?

-- 
A+ Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

Message #20 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#6995: 24.0.50;
	get-free-disk-space doesn't return available space in dired
Date: Wed, 15 Sep 2010 20:39:39 +0200

Thierry Volpiatto <thierry.volpiatto <at> gmail.com> writes:

> Stefan Monnier <monnier <at> iro.umontreal.ca> writes:
>
>>> How about dropping the use of `df', at least on GNU/Linux?  It's IMO
>>> ridiculous to invoke an external program for a single system call.  I
>>> know that this system call is notoriously non-portable, and that doing
>>> in Emacs all that system-dependent stuff that `df' does is not a good
>>> idea.  But at least on the most popular free system (and perhaps on a
>>> few compatible ones) we could do it right without all that labor, and
>>> gain stability and reliability that depending on `df' will never
>>> achieve.
>>
>> That would make a lot of sense, yes,
>
> I agree too, but waiting such a change, you should rewrite
> `get-free-disk-space' as it can't work correctly on the output of df.
>
> ,----
> | 	    ;; Usual format is as follows:
> | 	    ;; Filesystem ...    Used  Available  Capacity ...
> | 	    ;; /dev/sda6  ...48106535   35481255  10669850 ...
> | 	    (goto-char (point-min))
> | 	    (when (re-search-forward " +Avail[^ \n]*"
> `----
>
> But usual format is not the same on all locales:
> Here it is:
>
> ,----
> | Sys. de fichiers    1024-blocs   Utilisé    Dispo. Capacité Monté sur
> | /dev/sda7             48947688  21618816  24842416      47% /home
> `----
>
> So (re-search-forward " +Avail[^ \n]*" is not portable here.
>
> I use this simplified version of get-free-disk-space if it can help:
>
> ,----
> | (defun get-free-disk-space (dir)
> |   (let* ((data   (with-temp-buffer
> |                    (call-process directory-free-space-program
> |                                  nil t nil
> |                                  directory-free-space-args
> |                                  dir)
> |                    (split-string (buffer-string) "\n" t)))
> |          (values (cdr (split-string (second data)))))
> |     (nth 2 values)))
> `----

With the windows stuff and no call when remote:

(defun get-free-disk-space (dir)
  (unless (file-remote-p dir)
    ;; Try to find the number of free blocks.  Non-Posix systems don't
    ;; always have df, but might have an equivalent system call.
    (if (fboundp 'file-system-info)
	(let ((fsinfo (file-system-info dir)))
	  (if fsinfo
	      (format "%.0f" (/ (nth 2 fsinfo) 1024))))
        (when (executable-find directory-free-space-program)
          (let* ((data   (with-temp-buffer
                           (call-process directory-free-space-program
                                         nil t nil
                                         directory-free-space-args
                                         dir)
                           (split-string (buffer-string) "\n" t)))
                 (values (cdr (split-string (second data)))))
            (when data (nth 2 values)))))))


> Tough the version on 23.2 work also.
>
> Note that the value of "total used in directory" is always wrong.
> How do you get this value?

-- 
A+ Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

Message #23 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#6995: 24.0.50;
	get-free-disk-space doesn't return available space in dired
Date: Sat, 18 Sep 2010 15:54:45 +0200

Thierry Volpiatto <thierry.volpiatto <at> gmail.com> writes:

> With the windows stuff and no call when remote:
>
> (defun get-free-disk-space (dir)
>   (unless (file-remote-p dir)
>     ;; Try to find the number of free blocks.  Non-Posix systems don't
>     ;; always have df, but might have an equivalent system call.
>     (if (fboundp 'file-system-info)
> 	(let ((fsinfo (file-system-info dir)))
> 	  (if fsinfo
> 	      (format "%.0f" (/ (nth 2 fsinfo) 1024))))
>         (when (executable-find directory-free-space-program)
>           (let* ((data   (with-temp-buffer
>                            (call-process directory-free-space-program
>                                          nil t nil
>                                          directory-free-space-args
>                                          dir)
>                            (split-string (buffer-string) "\n" t)))
>                  (values (cdr (split-string (second data)))))
>             (when data (nth 2 values)))))))
>

But may be it's better to have other infos from output of df available:

(defun get-free-disk-space (dir &optional human)
  (unless (file-remote-p dir)
    ;; That is for windows.
    (if (fboundp 'file-system-info)
	(let ((fsinfo (file-system-info dir)))
	  (if fsinfo
	      (format "%.0f" (/ (nth 2 fsinfo) 1024))))
        ;; And this is for Unix/GNULinux.
        (when (executable-find directory-free-space-program)
          (getf (tv-get-disk-info dir human) :available)))))

(defun tv-get-disk-info (dir &optional human)
  (let* (args    (if human
                     (concat directory-free-space-args "h")
                     directory-free-space-args)
         (data   (with-temp-buffer
                   (call-process directory-free-space-program
                                 nil t nil args dir)
                   (split-string (buffer-string) "\n" t)))
         (values (split-string (second data))))
    (loop for i in '(:device :blocks :used :available :capacity :mount-point)
       for j in values
       append (list i j))))

-- 
A+ Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

Message #26 received at 6995 <at> debbugs.gnu.org (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 6995 <at> debbugs.gnu.org, Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
Subject: Re: bug#6995: 24.0.50;
	get-free-disk-space doesn't return available space in dired
Date: Sat, 25 Sep 2010 16:17:42 -0400

Glenn Morris <rgm <at> gnu.org> writes:

> Because the filesystem name is long, the numerical values do not line
> up with the column headings. The current code seems to assume that
> they do line up. Thus, running dired on "~" gets wrong values for the
> total size.

I've just checked in a change to use the "%" as an anchor for finding
the available space, instead of assuming the columns line up.  Patches
to avoid using `df' welcome...

Message #29 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#6995: 24.0.50;
	get-free-disk-space doesn't return available space in dired
Date: Mon, 27 Sep 2010 10:37:14 +0200

Chong Yidong <cyd <at> stupidchicken.com> writes:

> Glenn Morris <rgm <at> gnu.org> writes:
>
>> Because the filesystem name is long, the numerical values do not line
>> up with the column headings. The current code seems to assume that
>> they do line up. Thus, running dired on "~" gets wrong values for the
>> total size.
>
> I've just checked in a change to use the "%" as an anchor for finding
> the available space, instead of assuming the columns line up.  Patches
> to avoid using `df' welcome...
I don't understand why you want to use regexp searching here...
But well, it work...and you can get only one info from the output of df.
Seem you didn't look at what i sent here...

-- 
A+ Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

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