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Re: yum-deltarpm (Was Thread Hijack - Our package management GUI tools need improvement)



Jonathan Dieter wrote:
On Fri, 2007-03-09 at 20:01 -0500, Warren Togami wrote:
1) Client wants to upgrade from foo-3.2-1 to foo-3.2-2 (Transition X)
2) Client metadata sees that Transition X has a drpm available (from metadata or something).
At the moment, it checks to see if a drpm is available from your
deltarpm url that matches a filename.  If the file doesn't exist, then
there is no drpm for this particular update.  I could code in a way of
using metadata rather than filename checking, if that's what's
preferred.  Are we talking a yum-style xml file?

Yes. But this is only an optimization for later. Checking for existence of the file and using 404 is a bit slow, so metadata would speed this up a bit.

3) Client checks using rpm -V (or more likely the rpm API equivalent) to see if the local files are intact. This step is a little time consuming, but it is worthwhile because we know that a drpm is available above the defined efficiency threshold.
Should be easy to implement, and, yes, would be very important.  FYI,
the current efficiency threshold is 50%.  It is very easy to adjust this
level.

Could the efficiency threshold be > 50% and drpm is larger than a certain size? This is because it is pointless to have drpms of tiny packages. What exact threshold size however I don't know.

4) All files are intact, except some files in /etc marked %config are changed. This is OK.
Yes.  Deltarpm stores %config files in the drpm no matter whether
they've changed or not.
5) drpm contains %config file data even if they did not change in Transition X. This allows reconstruction of the original foo-3.2-2 RPM even if the local %config files are modified.

deltarpm needs to put data within the drpm that is likely to change on the local systems. This includes %config, but possibly other things like /var. We can craft this predefined list to whatever our research finds is necessary.
As far as I know, deltarpm doesn't have a way for the user to choose
which files *must* get stored in the drpm.

Not asking for users to choose which files must be stored in drpm. Just indicating that it might be important for other non-%config files to be stored. I might be wrong. We'll see in testing.

Warren Togami
wtogami redhat com


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