Re: [gentoo-user] How to degrade Gentoo system with webrsync method?

[Daniel Frey <djqfrey@gmail.com>]

On 2022-01-09 05:13, gevisz wrote:
> Yes, masking some new package can work in this case.
> 
> However, it is not so easy as it may seem because it is not the new
> version of tensorflow that I should mask in my case as on the day
> when the tensorflow recompilation failed its version remained the same
> and only some of its dependencies were supposed to be upgraded.
> 
> Of course, I may try this approach. However, tensorflow is not
> considered stable in gentoo tree and it has a lot of dependencies
> that are also not considered stable and should be unmasked.
> 
> All this leads to a large number of possible choices on
> which packages to mask/unmask.
> 
> So, playing with this is like playing in a casino with about
> 4 hours of compilation for each bet.
> 

So you know the date it last compiled and run successfully?

If it was me, I'd build a manual list of dependencies (like Dale 
indicated), then install genlop and run `genlop -t` for each of the 
dependencies and the main package. It will tell you the versions that 
were built, and more importantly, the *date* they were built.

You should be able to deduce what package versions were working with 
each other, but then the hard part: trying to figure out if those 
versions are still available. `eshowkw <package>` will tell you what's 
available in the tree, but if it isn't available, then it gets way 
harder as you have to try to find the old ebuilds with sources and 
possibly set up a local repo and pray those packages don't affect other 
installed packages.

Dan