config file & preserved libs messages?

[pmam]

After I succeeded to run 'emerge world' as you may see in the following topic: https://forums.gentoo.org/viewtopic-t-993462-highlight-.html -
I got the following output messages at the end of the running:

[The Doctor]

This would have been best added to your other thread, but never mind that.

Well, when libraries are updated sometimes the way they interact (called the API) changes. When that happens the software compiled against the old one breaks and will no longer run. Portage used to just let this happen and we had a tool to detect the breakages and fix them. It still exists (revdep-rebuild) but isn't needed as often. Now portage detects when this happens and does not break the packages. Instead it waits for the problem to be fixed before completing the update. See https://www.gentoo.org/proj/en/portage/doc/faq.xml.

If you reread your output you will see that portage does tell you what to do: you need to run emerge @preserved-rebuild I recomend adding -av since having portage ask before doing anything and turning on verbosity for more information is good operating practice.

Next, config files. Since portage doesn't know what are edits you have made and what are changes in the config files it requires you to check. If you don't things will break. The page you linked to is an excellent source. Personally I prefer dispatch-conf. I find it to be easer to use than etc-update and safer. It is just too easy to make a mistake with etc-update. Conveniently, both commands are the name of the program. A general rule is that if you edited the file then you should check the changes carefully. If you have never touched it, update it.

The way to read these guides is anything in a code block is a command that is run from a terminal or the contents of a file.

There is actually a third issue in your emerge output and that is news. Important information is distributed issued via the news. This can range from thinks like "ruby18 is no longer supported and you should switch to a newer version" to "OpenRC just hit the tree. Read and follow this guide or your system will not boot"

Use eselect news read all to read all your news. Personally, I purge mine after I deal with it (eselect news purge all). This just cleans it up and makes interacting with it a little easer.


I also recommend you learn about your friend the man command. For example, man emerge will open the manual for emerge, man man will open the manual pages for the manual, etc.
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First things first, but not necessarily in that order.

Apologies if I take a while to respond. I'm currently working on the dematerialization circuit for my blue box.