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README.md: Some more notes about upgrading

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Colin Walters 2011-10-16 14:24:56 -04:00
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@ -199,6 +199,20 @@ difference internally), we simply check out a new tree into
/gnomeos-b90ae4763 for example, then swap the symbolic link, then
remove the old tree.
But does this mean you have to "reboot" for OS upgrades? Very likely,
yes - and this is no different from RPM/deb or whatever. They just
typically lie to you about it =) But read on.
Let's consider a security update to a shared library. We can download
the update to the repository, build a new tree and atomically swap it
as above, but what if a process has the old shared library in use?
Here's where we will probably need to inspect which processes are
using the library - if any are, then we need to trigger either a
logout/login if it's just the desktop shell and/or apps, or a
"fastboot" if not. A fastboot is dropping to "init 1" effectively,
then going back to "init 5".
Configuration Management
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