bug#6268: Suggestion: truncate should allow -r and -s options together (original) (raw)

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From: Richard W.M. Jones
Subject: bug#6268: Suggestion: truncate should allow -r and -s options together
Date: Tue, 25 May 2010 15:32:05 +0100
User-agent: Mutt/1.5.18 (2008-05-17)

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

-- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 80 OCaml packages (the OPEN alternative to F#) http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora