yum upgrade v anaconda upgrade differences
Jeremy Katz
katzj at redhat.com
Sun May 17 23:47:17 UTC 2009
On Sunday, May 17 2009, Seth Vidal said:
> 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.
It also means that we can do things like use a newer version of rpm or a
new kernel with ext4 support to (eventually) allow for migrating from
ext3->ext4
Jeremy
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