[maemo-developers] Ovi Store disk space requirements miscalculations

[From: Marius Vollmer]

ext Martin Storsjö <martin at martin.st> writes:

> OPT folder value should be 80% of USR folder.

Taken literally, this means that the OPT folder is actually supposed to
be smaller than the USR folder... :-)

> ACTUAL OUTCOME:
> Opt folder value is not 80% of usr folder ,usr=84,opt=388k.

This actually checks out for me:

    388 / (388 + 84) = 0.82 > 0.8

Maybe they want USR to be at most 20% of OPT?  That would be a bit strange, but
would explain the verdict:

    84 / 388 = 0.21 > 0.20

If I remember right, Urho and me invented these numbers hand wavingly
some time ago.  The idea back then was that if the OPT/USR ratio of a
package is always larger than the OPT/USR ration of the actual
partitions, then you can install as many packages as will fit into OPT
without running out of USR.

The partitions are 2G / 256M = 8.

With the "du" numbers on ext3, your package has a ratio of

     388 / 84 = 4.6 < 8

which would indeed fail the requirements.


With your numbers on ubifs, we have

    368 / 20 = 18.4 > 8

and you win by a huge margin.

However, I agree that directories should not be counted at all.  Then
you will probably win by a even larger margin.


To summarize: I don't know what they have calculated, but I think they
should calculate the OPT/USR ratio and require it to be larger than 8.
Furthermore, only actual files should be counted.  Filesystem specific
effects like directories should be exluded.  This is a heuristic anyway
and making it simpler and easier to reproduce in different environments
is therefore more important than accurate simulation of what would
happen on the device.

(If we want to simulate the device, we need to take UBIFS compression
into account.)

> Also, is there any idea in trying to discuss these issues in Ovi Publish 
> by commenting back? On Ovi/Symbian things, I've never ever seen a reviewer 
> actually take my comments in account, so I don't think anybody ever reads 
> the comments the submitter writes.

I'll try to ping the right people here.