Bug 550056

Summary:	sys-apps/portage: emerge slot conflict output should suggest solutions involving USE changes for conditional dependencies
Product:	Portage Development	Reporter:	Pacho Ramos <pacho>
Component:	Core - Interface (emerge)	Assignee:	Portage team <dev-portage>
Status:	CONFIRMED ---
Severity:	normal	CC:	esigra, kingjon3377
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
See Also:	https://bugs.gentoo.org/show_bug.cgi?id=550002 https://bugs.gentoo.org/show_bug.cgi?id=791349
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	300071

Description Pacho Ramos gentoo-dev

2015-05-21 14:48:14 UTC

Looking to reports like:
https://bugs.gentoo.org/show_bug.cgi?id=549978#c5
https://bugs.gentoo.org/show_bug.cgi?id=550002

Looks like the current output:
!!! Multiple package instances within a single package slot have been pulled                                                                                                                                                                       
!!! into the dependency graph, resulting in a slot conflict:                                                                                                                                                                                       
                                                                                                                                                                                                                                                   
media-libs/libvpx:0                                                                                                                                                                                                                                

  (media-libs/libvpx-1.3.0:0/0::gentoo, installed) pulled in by
    =media-libs/libvpx-1.3.0* required by (www-client/firefox-31.7.0:0/0::gentoo, installed)
    ^                  ^^^^^^

  (media-libs/libvpx-1.4.0:0/2::gentoo, ebuild scheduled for merge) pulled in by
    >=media-libs/libvpx-1.4.0:= required by (www-client/chromium-43.0.2357.65:0/0::gentoo, ebuild scheduled for merge)

Should point to the USE flag causing the blockers to allow people to guess they should switch it, in this case, the offending USE is "system-libvpx"

Thanks a lot :)

Comment 1 Zac Medico gentoo-dev

2015-05-21 17:55:49 UTC

The slot_conflict_handler checks for solutions to USE deps, but apparently it doesn't check for USE conditional solutions like this.