[libvirt] Re: [PATCH] also allow use of XZ for Qemu image compression

[Jim Meyering]

Daniel Veillard wrote:

> On Wed, Sep 09, 2009 at 11:57:40AM +0200, Jim Meyering wrote:
>> Daniel Veillard wrote:
>> >   Hum, I realize that support of LZOP was added after 0.7.0, so we never
>> > made a release with it (well except for git snapshot which may have been
>> > pushed).
>> >   I wonder if the best is not to just drop the lzop option altogether
>> > and stick xz as a package dependancy until we have found a way to
>> > provide at the API level which compression options are actually
>> > available.
>> >
>> >   Opinions ?
>>
>> Dropping lzop sounds good.  It seems lzop is not very popular.
>> We don't need that many choices.
>>
>> Maybe even nuke lzma too before we're stuck with it forever.
>> Technically, we can do that, since it was added only a month ago,
>> also after 0.7.0:
>>
>>   v0.7.0-35-g2d6a581
>
> Actually om my machine here lzma is provided as a backward compat option
> by xz, so yes I'm inclined to remove that option too:
>
> aphio:~ -> which lzma
> /usr/bin/lzma
> paphio:~ -> rpm -qf /usr/bin/lzma
> xz-lzma-compat-4.999.8-0.8.beta.20090817git.fc11.x86_64
>
> I will post a patch later,

FYI, xz can decompress lzma-compressed input:

  $ echo foooo |lzma -c|xz -dc
  foooo

so libvirt won't need the "lzma" command, as long as xz is available.