Bug 511878

Adding Panu and Clumens. Is there anything we can do to make the disk space check that yum/preupgrade does and the disk space check that anaconda does a bit more similar?

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Seth - in F14, anaconda is a proper python module.  It should therefore be possible to import the proper components out of anaconda and make use of whatever checks you need that way.  If you guys need help on this, just shoot us a mail on anaconda-devel-list and we'll be happy to help.

adding Richard to this one and reassinging to rawhide.

This bug appears to have been reported against 'rawhide' during the Fedora 14 development cycle.
Changing version to '14'.

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*** Bug 629814 has been marked as a duplicate of this bug. ***

There's already code in preupgrade to run the same diskspace check as anaconda does - see transaction_test_diskspace() in __init__.py. It takes several minutes to run and is usually wrong.

The problem is that when you're using preupgrade, you're using the rpm/yum on the host system - not the rpm/yum that are in the install image. And they may not agree on how much disk space is needed to complete the transaction.

I'm also fairly sure the (anaconda) upgrade process itself writes a significant amount of data to disk, which also throws off the accuracy of the pre-upgrade diskspace check.

Unless you can mitigate these problems,  it's much faster and no less accurate to simply use an educated guess - based on how much extra disk space is usually needed, erring on the side of caution. Which is why get_upgrade_size just does:
    return 500 * 1024 * 1024

So the disk space check either needs to be more clever, and take into account *all* the ways available disk space might vary at upgrade time - or you just need to bump that up to 600MB, since all the false-positive reports I have seen have been off by 20-50MB.

Hmm, "git blame" tells me the "takes several minutes to run" notion + commentary is from 2008. That was certainly true at the time, but it's gotten several orders of magnitude faster since then.

The other problems are still relevant though. Rpm doesn't know how much additional disk space anaconda, yum and other things (eg side-effects from package scriptlets) are going to consume during the upgrade, so the it can only tell you if the transaction is absolutely NOT going to fit on the available disk.

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This was still an issue with upgrading to F17.

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