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dynamic deltup server version 0.6.2 |
current version of getdelta.sh: 0.6.9 |
Most recent news:
2005/03/05 Good news! Due to the efforts of Stefan Schweizer aka genstef
deltup is back to the official portage tree as well as getdelta is now
available as official ebuild. Thank you, Stefan.
2005/02/20 Re-enabled the external ftp-cache - so we've got cache in full
size back now.
2005/02/07 Due to temporary technical problems the external ftp-cache has
been disabled. We've got a much smaller cache now, but that's much
better than waiting forever or getting non working download-URLs for the
dtu-files. Sorry about the unconvenience. We hope to find a solution soon.
2004/10/22 getdelta-0.6.7 released.
2004/10/22 getdelta-0.6.3 released.
2004/10/22 getdelta-0.6.2 released.
2004/10/18 getdelta-0.6.1 released.
2004/10/13 I've dropped the (broken) mirror-detection on client-side.
That leads to a change in query-format and again the update is forced.
2004/10/12 There is an getdelta-0.6.ebuild for getdelta available now.
Those who use gensync (from pkg app-portage/gentoolkit-dev) can use
this deltup.syncsource to be informed about and merge updates now.
2004/10/11 A security flaw has been fixed - getdelta-0.5.4 forced.
2004/09/20 The new way to find the thirdpartymirror gave wrong paths when
a third party mirror was used. Sorry about that. Fixed in getdelta.sh
0.5.3.4
2004/09/16 I have put a new version of getdelta.sh (0.5.3.3) on the server.
With this new version you do not need to set GENTOO_MIRRORS to an empty
string anymore, since I have changed the way to detect the correct
mirror-group to a more failsafe way. So update your getdelta.sh and set your GENTOO_MIRRORS to
whatever you like.
What is the dynamic deltup server? The dynamic deltup server
provides delta-updates (*.dtu) on demand. A delta-update can be used
in combination with an older version of the same source-archive to
create the new version of the software, saving a lot of
download-traffic and -time,
since the delta-update contains the differences to the older version
only.
How
much traffic can be saved using the dynamic deltup server? This depends on how much a
source-archive changed between versions – some updates save a
lot (for example updating firefox from version 0.9.1 to version
0.9.3 saves 98.77% of traffic - that means you would have to download
408 kB instead of >32MB) others are less efficient (for example updating
wxGTK from version 2.4.2 to version 2.5.1 saves 57% only – but
that still means you save more than 3MB of download, downloading 2.6
MB instead of 6MB) – Typically we save about 70-80% of traffic.
Have a look at our cache-status-page which shows the current
cache-content and some stats about filesizes and efficiency:
http://linux01.gwdg.de/~nlissne/deltup-status.atime.html
(warning: this page is large)
Is
it safe to use delta-updates? Yes, the resulting
source-archives are bit-identical and pass an md5sum-check. This is
most important to be able to use it transparent to portage by using a
special download-wrapper via the FETCHCOMMAND option in
/etc/make.conf If the server cannot provide a delta-update file for any
reason, getdelta.sh falls back to normal download of the original archive. Which
source-archives can be updated with the server? One of the best things about
the dynamic deltup server is: It can provide updates to virtually any
package. If the same update has been requested before, it provides
the dtu-file from a cache, if you are the first user requesting an
update, the server creates the file on demand (therefore it's called
dynamic). Even version jumps
from older versions than the previous are supported. The only
limitation is, the server must be able to get both versions (your old
version and the new version) from somewhere.
This
sounds great, how can I use it? Download deltup-0.4.2.ebuild and copy it to your
OVERLAY-portage-tree. (well, deltup once has been in portage tree
and has been removed – a sad story &ndash however, I don't want to
discuss it here. It is not in the official portage-tree anymore, so
you have to use your overlay-tree) Install deltup. Download getdelta.sh and copy it to /usr/local/bin (or
wherever you like) and change permissions to executable. Put the following line into your /etc/make.conf to make it
work:
In case your are not
familiar with using the overlay tree, have a look at deelkar's fast
step by step instructions on
http://forums.gentoo.org/viewtopic.php?t=215262
(there is a german howto at
http://forums.gentoo.org/viewtopic.php?t=215401)
The server-scripts and
the client-script getdelta.sh
were written by Nicolai Lissner <nlissne@linux01.gwdg.de>
aka as blackpenguin on IRC-Network freenode (there is a
channel #dynamic-deltup-server -- I am quite often available
there to answer your questions and listen to your enhancement
proposals) Feel free to give feedback or ask questions via mail, IRC
or gentoo forums. You are welcome! But
all this would not have been happened without the work of John
Whitney, who originally brought us deltup
->
see http://deltup.sourceforge.net.
Thank
you, John. Deltup
uses Joshua P. MacDonald's
xdelta to create the delta-files
->
see http://www.xdelta.org Thank
you, Joshua.
...and a few hours later...
getdelta-0.6.4 released (funny, same
stupid bug done twice).
FETCHCOMMAND="/usr/local/bin/getdelta.sh \${URI}"
Who
wrote the dynamic deltup server?