[Satellite6] Upgrade Step: migrate_foreman is failing Gem loading error: Unable to activate fog-1.38.0, because fog-core-2.1.0 conflicts with fog-core (~> 1.32)

Solution Verified - Updated

Environment

Satellite 6.5
Satellite 6.6

Issue

Upgrading of satellite is failing

[ INFO 2019-12-11T11:21:54 main] Upgrade Step: migrate_foreman...
[DEBUG 2019-12-11T11:21:59 main] rake aborted!
[DEBUG 2019-12-11T11:21:59 main] Gem loading error: Unable to activate fog-1.38.0, because fog-core-2.1.0 conflicts with fog-core (~> 1.32)

[DEBUG 2019-12-11T11:21:59 main] Caused by:
[DEBUG 2019-12-11T11:21:59 main] Gem::ConflictError: Unable to activate fog-1.38.0, because fog-core-2.1.0 conflicts with fog-core (~> 1.32)
[DEBUG 2019-12-11T11:21:59 main] /opt/theforeman/tfm/root/usr/share/gems/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'

[ERROR 2019-12-11T11:21:59 main] foreman-rake db:migrate failed! Check the output for error!
[ERROR 2019-12-11T11:21:59 main] Upgrade step migrate_foreman failed. Check logs for more information.
[DEBUG 2019-12-11T11:21:59 main] Exit with status code: 1 (signal was 1)
[ERROR 2019-12-11T11:21:59 main] Errors encountered during run:
[ERROR 2019-12-11T11:21:59 main] foreman-rake db:migrate failed! Check the output for error!
======================

foreman-rake db:migrate is failing

rake aborted!
Gem loading error: Unable to activate fog-1.38.0, because fog-core-2.1.0 conflicts with fog-core (~> 1.32)
/opt/theforeman/tfm/root/usr/share/gems/gems/bundler_ext-0.4.1/lib/bundler_ext/output.rb:13:in `strict_err'
/opt/theforeman/tfm/root/usr/share/gems/gems/bundler_ext-0.4.1/lib/bundler_ext/runtime.rb:52:in `rescue in rescue in block in system_require'
/opt/theforeman/tfm/root/usr/share/gems/gems/bundler_ext-0.4.1/lib/bundler_ext/runtime.rb:43:in `rescue in block in system_require'
/opt/theforeman/tfm/root/usr/share/gems/gems/bundler_ext-0.4.1/lib/bundler_ext/runtime.rb:39:in `block in system_require'
/opt/theforeman/tfm/root/usr/share/gems/gems/bundler_ext-0.4.1/lib/bundler_ext/runtime.rb:37:in `each'
/opt/theforeman/tfm/root/usr/share/gems/gems/bundler_ext-0.4.1/lib/bundler_ext/runtime.rb:37:in `system_require'
/opt/theforeman/tfm/root/usr/share/gems/gems/bundler_ext-0.4.1/lib/bundler_ext.rb:19:in `block in system_require'
/opt/theforeman/tfm/root/usr/share/gems/gems/bundler_ext-0.4.1/lib/bundler_ext.rb:14:in `each'
/opt/theforeman/tfm/root/usr/share/gems/gems/bundler_ext-0.4.1/lib/bundler_ext.rb:14:in `system_require'
/usr/share/foreman/config/application.rb:17:in `<top (required)>'
/opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:59:in `require'
/opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:59:in `require'
/usr/share/foreman/Rakefile:1:in `<top (required)>'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/lib/rake/rake_module.rb:29:in `load'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/lib/rake/rake_module.rb:29:in `load_rakefile'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/lib/rake/application.rb:703:in `raw_load_rakefile'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/lib/rake/application.rb:104:in `block in load_rakefile'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/lib/rake/application.rb:186:in `standard_exception_handling'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/lib/rake/application.rb:103:in `load_rakefile'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/lib/rake/application.rb:82:in `block in run'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/lib/rake/application.rb:186:in `standard_exception_handling'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/lib/rake/application.rb:80:in `run'
/opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.0/exe/rake:27:in `<top (required)>'
/opt/rh/rh-ruby25/root/usr/bin/rake:23:in `load'
/opt/rh/rh-ruby25/root/usr/bin/rake:23:in `<main>'

Resolution

Check if there are This content is not included.duplicate rpms
If yes, clean the duplicates first.

Identify obsolete rubygems which are not owned by any installed rpms

#cd /opt/theforeman/tfm/root/usr/share/gems/gems
#ls | xargs rpm -qf * | grep -i 'not owned by any package'

Delete identified obsolete rubygems and empty directories.

#ls | xargs rpm -qf * | grep -i 'not owned by any package' | awk -F ' ' '{print $2}' | xargs rm -rf

Restart satellite services

#foreman-maintain service restart

For more KB articles/solutions related to Red Hat Satellite 6.x Installation/Upgrade/Update Issues, please refer to the Red Hat Satellite Consolidated Troubleshooting Article for Red Hat Satellite 6.x Installation/Upgrade/Update Issues.

Root Cause

fog-1.38 was not deleted from /opt/theforeman/tfm/root/usr/share/gems/gems during #yum update transaction and it is referencing to old rubygem versions which are no longer available.

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