Re: What are .commitmeta files and why is delta update so huge?

[Leandro Santiago <leandrosansilva gmail com>]

I've just filled a bug report on:
https://bugzilla.redhat.com/show_bug.cgi?id=1235936

On 26 June 2015 at 08:21, Leandro Santiago <leandrosansilva gmail com> wrote:
> On 25 June 2015 at 18:07, Giuseppe Scrivano <gscrivano gnu org> wrote:
> > Leandro Santiago <leandrosansilva gmail com> writes:
> >
> > > Well, they are quite small (a few kb). Is there any tool to analyse
> > > the content of those files? (I bet not, but asking does not hurt :-))
> > >
> > > There might be some other changes, as I create a new tree from the
> > > scratch using rpm-ostree tree compose. But the files are supposed to
> > > be almost the same, as I am using centos and I don't think so many
> > > updates were made in so short interval of time (I built the two trees
> > > with a short interval between them).
> > >
> > > I'll try what you suggested, even though I am not sure if it will help
> > > as what I need is reducing the amount of downloaded data.
> >
> > it might help since only the difference between the two files is going
> > to be stored in the delta file, instead of downloading the entire new
> > file blob.
> >
> > Another thing you can try to check if OStree is doing the right thing is:
> >
> > ostree --repo=repo diff --fs-diff --stats $COMMIT_ID_1 $COMMIT_ID_2
> This command is amazing :-) By using it I realized there were a more
> changes involving big files.
> Files which haven't changed indeed, but just renamed during the tree
> creation by ostree. This is the important part of the diff:
> D    
> /boot/initramfs-3.10.0-229.7.2.el7.x86_64.img-c8c66111612920826e08d9b10a09624be3d41cedb44ea9cc40afe7b0cc74f124
> D    
> /boot/vmlinuz-3.10.0-229.7.2.el7.x86_64-c8c66111612920826e08d9b10a09624be3d41cedb44ea9cc40afe7b0cc74f124
> D    
> /usr/lib/ostree-boot/initramfs-3.10.0-229.7.2.el7.x86_64.img-c8c66111612920826e08d9b10a09624be3d41cedb44ea9cc40afe7b0cc74f124
> D    
> /usr/lib/ostree-boot/vmlinuz-3.10.0-229.7.2.el7.x86_64-c8c66111612920826e08d9b10a09624be3d41cedb44ea9cc40afe7b0cc74f124
> A    
> /boot/initramfs-3.10.0-229.7.2.el7.x86_64.img-755d6f3609c093448a21efdadb8ef173f26d596eec6ad8194f83f20566618ba3
> A    
> /boot/vmlinuz-3.10.0-229.7.2.el7.x86_64-755d6f3609c093448a21efdadb8ef173f26d596eec6ad8194f83f20566618ba3
> A    
> /usr/lib/ostree-boot/initramfs-3.10.0-229.7.2.el7.x86_64.img-755d6f3609c093448a21efdadb8ef173f26d596eec6ad8194f83f20566618ba3
> A    
> /usr/lib/ostree-boot/vmlinuz-3.10.0-229.7.2.el7.x86_64-755d6f3609c093448a21efdadb8ef173f26d596eec6ad8194f83f20566618ba3
>
> It means on each time rpm-ostree renames the files vmlinuz and
> initramfs, it creates different names, so the files are considered
> different, even though having the same content. As those files are
> big, the diff is also big. I guess this is a bug on rpm-ostree (my
> system is based on centos7), isn't it? It should preferably use same
> filename for them all keeping the diff small IMHO.
>
> Thanks a lot for your help :-)
>
> > and check what files are changed.
> >
> > Regards,
> > Giuseppe
>
>
>
> --
> Sent from my mind



-- 
Sent from my mind