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Bug 612042

Summary: sys-apps/portage: undesirable updates/rebuilds send backtracking for slot operator rebuilds off course
Product: Portage Development Reporter: Zac Medico <zmedico>
Component: Core - Interface (emerge)Assignee: Portage team <dev-portage>
Severity: normal CC: esigra, herrtimson
Priority: Normal Keywords: InVCS
Version: unspecified   
Hardware: All   
OS: All   
Package list:
Runtime testing required: ---
Bug Depends on:    
Bug Blocks: 155723, 612780    

Description Zac Medico gentoo-dev 2017-03-08 10:40:44 UTC
I encountered an issue where the highest_installed code from this commit causes undesirable updates to get pulled in:

The undesirable updates can trigger the need for additional rebuilds, causing backtracking to go off course and fail to find a solution. I'll post a patch that corrects the problem.
Comment 3 Zac Medico gentoo-dev 2017-03-14 00:26:50 UTC
This patch fixed an issue that I had noticed on a machine that had pending updates to sys-libs/db and dev-lang/perl, were every emerge command would try to pull in those pending updates like this:

# emerge -1vu app-misc/foo

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  NS    ] sys-libs/db-5.3.28-r2:5.3::gentoo [4.8.30-r2:4.8::gentoo] USE="cxx -doc -examples -java -tcl {-test}" 34,268 KiB
[ebuild  r  U  ] dev-lang/perl-5.22.3_rc4:0/5.22::gentoo [5.22.2:0/5.22::gentoo] USE="berkdb gdbm -debug -doc -ithreads" 11,080 KiB
[ebuild  r  U  ] sys-apps/iproute2-4.9.0::gentoo [4.4.0::gentoo] USE="berkdb iptables ipv6 -atm -minimal (-selinux)" 599 KiB
[ebuild     U  ] app-misc/foo-4.2.38::private-repo [4.2.37::private-repo] USE="{-test}" PYTHON_TARGETS="python3_4 (-python3_5)" 43 KiB
[ebuild  r  U  ] dev-vcs/subversion-1.9.5::gentoo [1.9.4::gentoo] USE="berkdb dso http python vim-syntax -apache2 -ctypes-python -debug -doc -extras -gnome-keyring -java -kde (-nls) -perl -ruby -sasl {-test}" PYTHON_TARGETS="python2_7" 7,720 KiB

Total: 5 packages (4 upgrades, 1 in new slot), Size of downloads: 53,709 KiB

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:


  (dev-lang/perl-5.22.3_rc4:0/5.22::gentoo, ebuild scheduled for merge) pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (dev-lang/perl-5.22.2-1:0/5.22::gentoo, installed) pulled in by
    =dev-lang/perl-5.22.2* required by (virtual/perl-libnet-3.50.0-r2-1:0/0::gentoo, installed)
    ^              ^^^^^^^                                                                                                                               
    (and 1 more with the same problem)

After the patch, I can emerge app-misc/foo without triggering the unwanted updates.
Comment 4 Zac Medico gentoo-dev 2017-05-20 18:24:46 UTC
Fixed in portage-2.3.5.