GNU bug report logs - #6268
Suggestion: truncate should allow -r and -s options together

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: "Richard W.M. Jones" <rjones <at> redhat.com>
Subject: bug#6268: closed (Re: bug#6268: Suggestion: truncate should allow
 -r and -s options together)
Date: Sat, 29 May 2010 09:48:02 +0000

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Your bug report

#6268: Suggestion: truncate should allow -r and -s options together

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 6268 <at> debbugs.gnu.org.

-- 
6268: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=6268
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Pádraig Brady <P <at> draigBrady.com>
To: 6268-done <at> debbugs.gnu.org
Subject: Re: bug#6268: Suggestion: truncate should allow -r and -s options
	together
Date: Sat, 29 May 2010 10:44:18 +0100

On 29/05/10 09:21, Jim Meyering wrote:
> Pádraig Brady wrote:
>> Subject: [PATCH] truncate: improve handling of non regular files
>>

> Thanks again.
> This all looks fine.

OK I pushed that with an addition to NEWS.

cheers,
Pádraig.

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From: "Richard W.M. Jones" <rjones <at> redhat.com>
To: bug-coreutils <at> gnu.org
Subject: Suggestion: truncate should allow -r and -s options together
Date: Tue, 25 May 2010 15:32:05 +0100

The manpage for truncate says:

  Note that the -r and -s options are mutually exclusive.

and indeed you cannot have both:

  $ truncate -r /tmp/ref -s +10M /tmp/new
  truncate: you must specify one of `--size' or `--reference'

We suggest using the 'truncate' command in the 'virt-resize'
documentation[1].  We want users to create a file which is the size of
an existing file + some extra amount.  Naturally this would be:

  truncate -r old-disk.img -s +1G new-disk.img

but this does not work and we have to suggest that users use two
separate 'truncate' commands[2].

Related to this feature request, it would be nice if you could suffix
a size with a % sign to indicate that you want to increase a file by a
certain percentage of the old or reference size, eg:

  truncate -r old-disk.img -s +10% new-disk.img

  truncate -r old-disk.img -s 110% new-disk.img

Neither of these forms work at the moment.

Rich.

[1] http://libguestfs.org/virt-resize.1.html#expanding_a_virtual_machine_disk
[2] http://git.annexia.org/?p=libguestfs.git;a=commitdiff;h=0e28e4104d96bf0bf5b88fb07bb7e5f9f6e6f41f#patch1

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