[bitbake-devel] [PATCH 0/1] Add support for 7-Zip compressed files

[Bystricky, Juro]

I agree.
I compressed the same tree with tar.xz, the compressed size is:

tar.xz: 88.9 MB

which is quite respectable and markedly better than tar.bz2.
To add bitbake support for this compression format should be quite straightforward.

Juro


> -----Original Message-----
> From: Mark Hatle [mailto:mark.hatle at windriver.com]
> Sent: Monday, January 4, 2016 12:36 PM
> To: Bystricky, Juro; bitbake-devel at lists.openembedded.org
> Cc: Purdie, Richard
> Subject: Re: [bitbake-devel] [PATCH 0/1] Add support for 7-Zip compressed
> files
> 
> On 1/4/16 12:51 PM, Juro Bystricky wrote:
> > 7-Zip offers substantially better compression than other compression
> > formats. In fact, 7-Zip explicitly claims it provides the best compression
> ratio.
> > To quickly test the claim, I compressed a gcc 5.2 538.8 MB tree snapshot in
> various ways:
> >
> > tar.bz2: 114.0 MB
> > tar.gz:  112.4 MB
> > tar.7z:   70.3 MB
> 
> I thought 7z was an archive format, that included compression information.
> 
> Since the compression that makes 7z better then bz2 is lzma, and 'xz' uses
> lzma as it's compression format.  (In my experience, .xz is really common on
> Linux -- 7z is only common on Windows.)
> 
> I'm not saying don't support .7z, but adding support for .tar.xz and others
> would make equal sense to me.  (There are a number of formats out there
> that could and likely should be added.)
> 
> --Mark
> 
> > At present, there is no support for 7-Zip compressed files in Bitbake.
> > Various public Git repositories only allow pushing files of certain
> > max size, AFAIK Github only allows 100MB, so there are cases where it
> > is desirable to use maximum compression possible.
> >
> >
> > Juro Bystricky (1):
> >   bitbake:fetch2/__init__.py: Add support for 7-Zip
> >
> >  bitbake/lib/bb/fetch2/__init__.py | 4 ++++
> >  1 file changed, 4 insertions(+)
> >