[Yum-devel] fallback on error'd dependencies

[Tim Lauridsen]

seth vidal wrote:
> Tim,
>  Last week I noticed something you said that yumex does. You said that
> if it encounters an unresolvable dependency on an update/upgrade that it
> would remove the package causing the problem from the transaction and
> try to finish with the rest of them. Is that correct?
>   
Yumex got at speciel "Safemode" option, if it is selected, then the 
packages selected for install/update/remove is check one at a time in 
the following way.
The package i added to the Transaction Set by calling the appropiate 
YumBase.install, .update or .remove.
Then YumBase.buildTransaction() is called, if the return code is ==2 
,then the package is added to a
good list.
The Transaction Set is cleared and the process i repeat for all the 
selected packages.
When all packages has been checked for dependency problems, then the 
good list is containing the packages there can be processed with out 
dependency problems.
All packages on the good list is added to Transaction Set and processed 
as usual.
> I'm curious if that code could be implemented as a mechanism off of the
> depcheck callback that yum uses now.  I wouldn't want the default to
> work that way (for all of the reasons I've already been through a bunch
> of times) but it might be a functional option.
>   
If this kind of "feature" should be include in yum it could be activated 
by a command line option.

something like

yum --predepcheck update.

It could work by make a method in YumBase called 'preCheckDependencies'

the function should take a list of packages as a parameter and some kind 
of action command (install,remove,update) and then do a depcheck on each 
package on the list and the return a list of
packages with no problems.

The YumCli could then call the preCheckDependencies if the 
'--predepcheck' was set.

> Would you be willing to take a look at that?
>   
If we define the way it should work, the i would give it a try to 
implement it.

Tim