non-interactive extracting the contents of a tar-file

non-interactive extracting the contents of a tar-file

[Klaus Berndl]

I know tar-mode and it displays a dired-like listing of the contents.
So the user can mark entries and extrakt them to a buffer...

What i want is the following:
Is it possible with tar-mode (or other already existing elisp-code), to
extract the full contents of a tar-file to a certain directory (or at least to
default-directory)?

Ciao,
Klaus

-- 
Klaus Berndl			mailto: klaus.berndl@sdm.de
sd&m AG				http://www.sdm.de
software design & management	
Carl-Wery-Str. 42, 81739 Muenchen, Germany
Tel +49 89 63812-392, Fax -220

Re: non-interactive extracting the contents of a tar-file

[Peter Dyballa]

Am 27.06.2005 um 12:23 schrieb Klaus Berndl:

> Is it possible with tar-mode (or other already existing elisp-code), to
> extract the full contents of a tar-file to a certain directory (or at 
> least to
> default-directory)?

There is an easier work-around in Emacs shell:

cd <some directory>
tar xf <some tar file>

--
Mit friedvollen Grüßen

   Pete

Either this man is dead or my watch has stopped. - Groucho Marx

Re: non-interactive extracting the contents of a tar-file

[Klaus Berndl]

On Mon, 27 Jun 2005, Peter Dyballa wrote:
>  
>  Am 27.06.2005 um 12:23 schrieb Klaus Berndl:
>  
> > Is it possible with tar-mode (or other already existing elisp-code), to
> > extract the full contents of a tar-file to a certain directory (or
> > at least to
> > default-directory)?
>  
>  There is an easier work-around in Emacs shell:
>  
>  cd <some directory>
>  tar xf <some tar file>

Hmm, i forgot to mention that i want it do without external programs like
tar and gz!

Ciao,
Klaus

-- 
Klaus Berndl			mailto: klaus.berndl@sdm.de
sd&m AG				http://www.sdm.de
software design & management	
Carl-Wery-Str. 42, 81739 Muenchen, Germany
Tel +49 89 63812-392, Fax -220

Re: non-interactive extracting the contents of a tar-file

[Peter Dyballa]

Am 27.06.2005 um 13:11 schrieb Klaus Berndl:

> Hmm, i forgot to mention that i want it do without external programs 
> like
> tar and gz!
>

I don't believe this could work. GNU Emacs needs external programmes 
like bzip2, gunzip, etc. to unpack the contents from a compressed file.

You can proof that yourself: rename the decompressors and try to open a 
compressed tar file!

--
Mit friedvollen Grüßen

   Pete

Got Mole problems?
Call Avogadro 6.02 x 10^23

Re: non-interactive extracting the contents of a tar-file

[Tim X]

Klaus Berndl <klaus.berndl@sdm.de> writes:

> On Mon, 27 Jun 2005, Peter Dyballa wrote:
> >  
> >  Am 27.06.2005 um 12:23 schrieb Klaus Berndl:
> >  
> > > Is it possible with tar-mode (or other already existing elisp-code), to
> > > extract the full contents of a tar-file to a certain directory (or
> > > at least to
> > > default-directory)?
> >  
> >  There is an easier work-around in Emacs shell:
> >  
> >  cd <some directory>
> >  tar xf <some tar file>
> 
> Hmm, i forgot to mention that i want it do without external programs like
> tar and gz!
> 
But doesn't emacs tar-mode just use tar 'under the hood'?

It may be possible to work out how to extract files from a tar archive
reasonably easily, but the unzipping/decompressing is going to be
difficult/impossible. Also, keep in mind that as GNU tar also supports
bzip2 compression, we are likely to see archive.tar.bz2 as well as
archive.tar.gz more often. 

Why the need not to use the correct tools? Is it because of platforms
which may not have tar or tar and gunzip equivelants and if so, what
platforms?

Tim


-- 
Tim Cross
The e-mail address on this message is FALSE (obviously!). My real e-mail is
to a company in Australia called rapttech and my login is tcross - if you 
really need to send mail, you should be able to work it out!

Re: non-interactive extracting the contents of a tar-file

[Klaus Berndl]

On 28 Jun 2005, Tim X. wrote:

>  Klaus Berndl <klaus.berndl@sdm.de> writes:
>  
> > On Mon, 27 Jun 2005, Peter Dyballa wrote:
> > >  
> > >  Am 27.06.2005 um 12:23 schrieb Klaus Berndl:
> > >  
> > > > Is it possible with tar-mode (or other already existing elisp-code),
> > > > to extract the full contents of a tar-file to a certain directory (or
> > > > at least to default-directory)?
> > >  
> > >  There is an easier work-around in Emacs shell:
> > >  
> > >  cd <some directory>
> > >  tar xf <some tar file>
> > 
> > Hmm, i forgot to mention that i want it do without external programs like
> > tar and gz!
> > 
>  But doesn't emacs tar-mode just use tar 'under the hood'?

No, untarring is done via elisp - see tar-mode.el

>  
>  It may be possible to work out how to extract files from a tar archive
>  reasonably easily, but the unzipping/decompressing is going to be
>  difficult/impossible. Also, keep in mind that as GNU tar also supports
>  bzip2 compression, we are likely to see archive.tar.bz2 as well as
>  archive.tar.gz more often.

yes, good point!

>  
>  Why the need not to use the correct tools? Is it because of platforms
>  which may not have tar or tar and gunzip equivelants and if so, what
>  platforms?

I had the wish to do it completely from within Emacs for my package so the
user has no need for installing stuff like tar or gzip (especially in
Windows-envs) - but the latter one is impossible, i see it now...

Klaus


>  
>  Tim

-- 
Klaus Berndl			mailto: klaus.berndl@sdm.de
sd&m AG				http://www.sdm.de
software design & management	
Carl-Wery-Str. 42, 81739 Muenchen, Germany
Tel +49 89 63812-392, Fax -220

Re: non-interactive extracting the contents of a tar-file

[Peter Dyballa]

Am 28.06.2005 um 10:16 schrieb Tim X:

> But doesn't emacs tar-mode just use tar 'under the hood'?
>

No. AFAIK Jamie Zawinsky wrote a native 'interpreter' for Tape ARchive 
files. It scans the structures, sees when a file or directory starts 
and ends, sees times and permissions ...

There is no such mechanism to un-compress (LHarc, arc, zip, gzip, UNIX 
compress, bzip2, Windows RAR and CABinet and PKzip, Mac OS Stuff and 
much older stuff, ...)

--
Greetings

   Pete

“One cannot live by television, video games, top ten CDs, and dumb 
movies alone”
       (Amiri Baraka 1999)

Re: non-interactive extracting the contents of a tar-file

[Tim X]

Peter Dyballa <Peter_Dyballa@Web.DE> writes:

> Am 27.06.2005 um 12:23 schrieb Klaus Berndl:
> 
> > Is it possible with tar-mode (or other already existing elisp-code), to
> > extract the full contents of a tar-file to a certain directory (or
> > at least to
> > default-directory)?
> 
> There is an easier work-around in Emacs shell:
> 
> cd <some directory>
> tar xf <some tar file>
> 
> --
> Mit friedvollen Grüßen
> 
>    Pete
> 
> Either this man is dead or my watch has stopped. - Groucho Marx
> 
Or from dired, hit !

,----[ C-h f dired-do-shell-command RET ]
| dired-do-shell-command is an interactive compiled Lisp function in `dired-aux'.
| (dired-do-shell-command COMMAND &optional ARG FILE-LIST)
| 
| Run a shell command COMMAND on the marked files.
| If no files are marked or a specific numeric prefix arg is given,
| the next ARG files are used.  Just C-u means the current file.
| The prompt mentions the file(s) or the marker, as appropriate.
| 
| If there is output, it goes to a separate buffer.
| 
| Normally the command is run on each file individually.
| However, if there is a `*' in the command then it is run
| just once with the entire file list substituted there.
| 
| If there is no `*', but a `?' in the command then it is still run
| on each file individually but with the filename substituted there
| instead of at the end of the command.
| 
| No automatic redisplay of dired buffers is attempted, as there's no
| telling what files the command may have changed.  Type
| M-x dired-do-redisplay to redisplay the marked files.
| 
| The shell command has the top level directory as working directory, so
| output files usually are created there instead of in a subdir.
| 
| In a noninteractive call (from Lisp code), you must specify
| the list of file names explicitly with the FILE-LIST argument.
`----

Tim

-- 
Tim Cross
The e-mail address on this message is FALSE (obviously!). My real e-mail is
to a company in Australia called rapttech and my login is tcross - if you 
really need to send mail, you should be able to work it out!

Re: non-interactive extracting the contents of a tar-file

[J. Alejandro Noli]

Klaus Berndl <klaus.berndl@sdm.de> writes:

> I know tar-mode and it displays a dired-like listing of the contents.
> So the user can mark entries and extrakt them to a buffer...
>
> What i want is the following:
> Is it possible with tar-mode (or other already existing elisp-code), to
> extract the full contents of a tar-file to a certain directory (or at least to
> default-directory)?

Have you seen emacs-goodies-el ?

there you have M-x browse-huge-tar-file, and it can work on a gziped one.
>
> Ciao,
> Klaus
>
> -- 
> Klaus Berndl			mailto: klaus.berndl@sdm.de
> sd&m AG				http://www.sdm.de
> software design & management	
> Carl-Wery-Str. 42, 81739 Muenchen, Germany
> Tel +49 89 63812-392, Fax -220

-- 
Saludos, 


- J. Alejandro Noli -
~~~~~~~~~~~~~~~~~~~~~

Re: non-interactive extracting the contents of a tar-file

[Stefan Monnier]

> Is it possible with tar-mode (or other already existing elisp-code), to
> extract the full contents of a tar-file to a certain directory (or at least to
> default-directory)?

The gunzipping needs to be done by an external program, but the untarring
can be performed by Emacs itself.  See install.el for an example of how you
can do that using tar-untar-buffer.  It's pretty untested code, tho.


        Stefan

Re: non-interactive extracting the contents of a tar-file

[Klaus Berndl]

On Tue, 28 Jun 2005, Stefan Monnier wrote:

> > Is it possible with tar-mode (or other already existing elisp-code), to
> > extract the full contents of a tar-file to a certain directory (or at
> > least to default-directory)?
>  
>  The gunzipping needs to be done by an external program, but the untarring
>  can be performed by Emacs itself.  See install.el for an example of how you
>  can do that using tar-untar-buffer.  It's pretty untested code, tho.

Thanks for the hint - where can i get install.el??

Ciao,
Klaus

>  
>  
>          Stefan

-- 
Klaus Berndl			mailto: klaus.berndl@sdm.de
sd&m AG				http://www.sdm.de
software design & management	
Carl-Wery-Str. 42, 81739 Muenchen, Germany
Tel +49 89 63812-392, Fax -220

Re: non-interactive extracting the contents of a tar-file

[Edward O'Connor]

> Thanks for the hint - where can i get install.el??

         http://www.iro.umontreal.ca/~monnier/elisp/install.el


Ted

-- 
Edward O'Connor
hober0@gmail.com

Ense petit placidam sub libertate quietem.

RE: non-interactive extracting the contents of a tar-file

[klaus.berndl]

Peter_Dyballa@Web.DE wrote:
> Am 27.06.2005 um 13:11 schrieb Klaus Berndl:
> 
>> Hmm, i forgot to mention that i want it do without external programs
>> like tar and gz!
>> 
> 
> I don't believe this could work. GNU Emacs needs external programmes
> like bzip2, gunzip, etc. to unpack the contents from a compressed
> file. 
> 
> You can proof that yourself: rename the decompressors and try to open
> a compressed tar file!

Hmm, yes, indeed, seems to be right... The emulation of tar in tar-mode.el
leads me to the (wrong) assumption that this is also possible for *.gz files....
Appaerently a wrong assumption ;-)

Ciao,
Klaus