On 11/17/2015 08:44 AM, Porfirio Andres Paiz Carrasco wrote:
2015-11-16 23:41 GMT-06:00 Ralf Corsepius <rc040203@xxxxxxxxxx>:
On 11/17/2015 05:28 AM, Sudhir Khanger wrote:
Hi,
I learned it the hard way that dnf undo/rollback will fail if packages
to rollback to are missing.
I would recommend not to waste time on rollbacks, because a package based
rollback will only work when a package's installation is non-stateful. This
applies to many "trivial packages", but does not apply in general.
Rollbacks works the same like downgrading?, Is the same task?
I am not sufficiently familiar with dnf's internals, but AFAICT, yes.
Downgrading is important when, for example you need to use xorg 1.17
instead of xorg 1.18 in order to install a nvidia privative driver
because nvidia does not works with the new xorg version.
The same consideration here: It's mere luck, if a downgrade works.
It's just that most packages are non-stateful, which lets downgrading
most packages succeed.
Ralf
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