Re: [gentoo-dev] Proposal for an alternative portage tree sync method

[Francesco Riosa]

Daniel Drake ha scritto:

> Ricardo Correia wrote:
>
>> Hi,
>> Please read the following proposal, I think you'll be interested:
>>
>> http://forums.gentoo.org/viewtopic-p-2218914.html
>
>
> So on every sync, you have to download the entire 260mb ISO file?
>
> I don't think our mirrors would be very happy about that.
>
> Daniel

After a fast read of what Ricardo Correia wrote I think reload the 
entire *26* Mb iso file is *not* needed. Maybe quoting the "What is 
zsync?" description from the homepage http://zsync.moria.org.uk/ could 
be explanatory

<quote>
zsync is a file transfer program. It allows you to download a file from 
a remote web server, where you have a copy of an older version of the 
file on your computer already. zsync downloads only the new parts of the 
file. It uses the same algorithm as rsync <http://rsync.samba.org/>.

zsync does not require any special server software or a shell account on 
the remote system (rsync, in comparison, requires that you have an rsh 
or ssh account, or that the remote system runs rsyncd). Instead, it uses 
a control file — a |.zsync| file — that describes the file to be 
downloaded and enables zsync to work out which blocks it needs. This 
file can be created by the admin of the web server hosting the download, 
and placed alongside the file to download — it is generated once, then 
any downloaders with zsync can use it. Alternatively, anyone can 
download the file, make a .zsync and provide it to other users (this is 
what I am doing for the moment).

zsync is currently no more than an alpha. I have tried to make it quite 
verbose, so it is clear what it is doing, and the checksum verification 
and file handling are designed to minimise the risk of it losing any 
data. It works well enough for me.
</quote>

regards
Francesco


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