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Impressive, sounds like magic, tbh! You know any tutorials?
Not really, I pulled it together from a bunch of random posts lol
Maybe I should write one, but in essence you:
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Stop all non-OS essential services
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Create a filesystem in a chunk of RAM
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Pull essential OS files from the installed OS into it recreating needed directories (Though you could probably just use a tiny pre-built distro but meh)
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Pivot root into it
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Reload services (when they restart they'll be restarted in the context of where you pivot rooted, prior they're still running under the context of the installed OS)
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Unmount the boot drive
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Then do what ever you need to do
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???
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Profit
How exactly so you pivot root? Simply chroot or something more involved?
chroot isn't enough, you need "real" pivot_root
chroot just changes the shells root point, pivot_root actually changes the root mount point and enables this trick to work
This is god-tier technique, kudos
Holy fuck
The man page has a good example.
I work in this field and I think this is 🔥 af
FYI you can use kexec and a prepared initrd to do something similar with only one command.
Imagining this process, despite having never done 50% of the steps on the list, makes my brain imagine this:
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Yeah, I'd love to see a write up on this to follow.Sounds like useful practice in the lab if nothing else.
i experimented with this some time ago, see my post here: https://lemmy.ml/post/18706002/12772832