yum upgrade v anaconda upgrade differences
skvidal at fedoraproject.org
Sun May 17 14:07:18 UTC 2009
On Sun, 17 May 2009, David Timms wrote:
> On the yum list a question was asked which intrigued me:
> Why can anaconda manage to upgrade a system, when yum upgrade can't.
> The postulation was that anaconda is cheating (ie running --nodeps installs).
> This would allow it to complete an upgrade where dependencies lead to
> unavailable packages that are not on the dvd, but are in the complete Fedora,
> and or non- fedora repositories, that are not available at upgrade time.
> Is that why it can work ?
> Or what are essential differences between an anaconda upgrade and yum upgrade
anaconda is also running outside of the system you're trying to update -
it doesn't have to worry about making its own environment entirely
unusable. So it can do things like --nodeps w/o a concern for not being
able to complete the transaction.
Finally anaconda uses a whiteout/blacklist info to be able to force
certain things out of the transaction. preupgrade uses those, now, via a
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