this post was submitted on 02 Aug 2024
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    What can I say, I didn't want to wait on my provider lol (lemmy.world)
    submitted 3 months ago by [email protected] to c/[email protected]
    46 comments fedilink hide all child comments
     

    It was also actually pretty fun!

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    [–] [email protected] 50 points 3 months ago* (last edited 3 months ago) (2 children)

    Impressive, sounds like magic, tbh! You know any tutorials?

    [–] [email protected] 87 points 3 months ago (4 children)

    Not really, I pulled it together from a bunch of random posts lol

    Maybe I should write one, but in essence you:

    • Stop all non-OS essential services

    • Create a filesystem in a chunk of RAM

    • 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)

    • Pivot root into it

    • 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)

    • Unmount the boot drive

    • Then do what ever you need to do

    • ???

    • Profit

    [–] [email protected] 24 points 3 months ago (2 children)

    How exactly so you pivot root? Simply chroot or something more involved?

    [–] [email protected] 73 points 3 months ago (2 children)

    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

    [–] [email protected] 27 points 3 months ago

    This is god-tier technique, kudos

    [–] [email protected] 12 points 3 months ago

    Holy fuck

    [–] [email protected] 15 points 3 months ago

    I work in this field and I think this is 🔥 af

    [–] [email protected] 6 points 3 months ago

    FYI you can use kexec and a prepared initrd to do something similar with only one command.

    [–] [email protected] 2 points 3 months ago

    Imagining this process, despite having never done 50% of the steps on the list, makes my brain imagine this: Turning a sphere outside in

    [–] [email protected] 27 points 3 months ago (1 children)

    Yeah, I'd love to see a write up on this to follow.Sounds like useful practice in the lab if nothing else.

    [–] [email protected] 2 points 3 months ago

    i experimented with this some time ago, see my post here: https://lemmy.ml/post/18706002/12772832