4/5/2022

Gentoo Portage Slot Conflict

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Conflict
  • use --autounmask=n
  • use --backtrack=1000 (or more)
  • package.mask all outdated packages that cause conflicts (usually requires more iterations)
  • run world update

Occasionally (more frequently on haskel packages) portage starts taking long time to only tell you it was not able to figure out the upgrade path.

Some people suggest 'wipe-blockers-and-reinstall' solution. This post will try to explain how to actually upgrade (or find out why it’s not possible) without actually destroying your system.

I’ll take a real-world example in Gentoo’s bugzilla: bug 579520 where original upgrade error looked like that:

Slot

A lot of text! Let’s trim it down to essential detail first (AKA how to actually read it). I’ve dropped the 'cause' of conflcts from previous listing and left only problematic packages:

That is more manageable. We have 4 'conflicts' here and one 'missing' package.

Note: all the listed requirements under 'conflicts' (the previous listing) suggest these are >= depends. Thus the dependencies themselves can’t block upgrade path and error message is misleading.

For us it means that portage leaves old versions of gtk+ (and others) for some unknown reason.

To get an idea on how to explore that situation we need to somehow hide outdated packages from portage and retry an update. It will be the same as uninstalling and reinstalling a package but not actually doing it 🙂

package.mask does exactly that. To make package hidden for real we will also need to disable autounmask: --autounmask=n (default is y).

Let’s hide outdated x11-libs/gtk+-3.18.7 package from portage:

Blocker list became shorter but still does not make sense:

Blocking more old stuff:

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The output is:

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That’s our blocker! Stable <dev-util/gdbus-codegen-2.48.0 blocks unstable blocking dev-libs/glib-2.48.0.

The solution is to ~arch keyword dev-util/gdbus-codegen-2.48.0:

And run world update.

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Simple!