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Re: Specifying tmp for tar



On Fri, 2007-08-31 at 23:53 +0300, Dotan Cohen wrote:
> On 31/08/2007, Rick Stevens <rstevens internap com> wrote:
> > On Fri, 2007-08-31 at 23:18 +0300, Dotan Cohen wrote:
> > > I have a 2 GB bz2 archive that unzips to over 10 GB (wikipedia dump).
> > > Although I have over 50 GB free in /home, / has only about 8 GB free.
> > > Thus, as tar uses /tmp, the / filesystem fills up and I cannot
> > > continue. How can I specify a tmp directory for tar in my home
> > > directory? Note that man tar makes no mention of a tmp option.
> >
> > Boot in single user mode,  Then as root:
> >
> >         # mkdir /home/tmp
> >         # chmod 777 /home/tmp
> >         # mv /tmp /tmp-old
> >         # ln -s /home/tmp /tmp
> >         # cp -a /tmp-old/* /tmp
> >
> > That creates a /home/tmp directory, allows everyone access, renames the
> > old /tmp to /tmp-old, symlinks /home/tmp to /tmp, then copies everything
> > that was in the old /tmp to the new one.  Once that's done, you can
> > reboot and all references to /tmp will now access /home/tmp.
> 
> Thanks, Rick, I'll try that. I can then simply erase the symlink? I
> know that "rm /tmp" will not erase the symlink, rather the content of
> /home/tmp so how can I remove it afterwards? Thanks.

No, "rm /tmp" will remove the symlink.  If you want to revert to the
original /tmp, reboot in single user mode again and as root:

	# cp -a /tmp/* /tmp-old
	# rm -f /tmp
	# mv /tmp-old /tmp

which will copy any changes from /home/tmp (/tmp) to the original /tmp
directory, then deletes the symlink and renames /tmp-old to /tmp.

> Also, as a learning experience, is there a way a user without root
> access could unpack the tar? It's not a problem, but I'd like to
> learn. Thanks.

If you were doing

	bunzip2 name-of-tar.bz2
	tar xf name-of-tar

or even

	bzcat name-of-tar.bz2 | tar xf -

then you're going to use /tmp.  Do it all in one command:

	tar xJf name-of-tar.bz2

to unzip and untar the thing.  Should do it all in the current
directory.
----------------------------------------------------------------------
- Rick Stevens, Principal Engineer             rstevens internap com -
- CDN Systems, Internap, Inc.                http://www.internap.com -
-                                                                    -
-      Always remember you're unique, just like everyone else.       -
----------------------------------------------------------------------


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