It was also actually pretty fun!
this post was submitted on 02 Aug 2024
593 points (98.4% liked)
linuxmemes
21393 readers
1247 users here now
Hint: :q!
Sister communities:
Community rules (click to expand)
1. Follow the site-wide rules
- Instance-wide TOS: https://legal.lemmy.world/tos/
- Lemmy code of conduct: https://join-lemmy.org/docs/code_of_conduct.html
2. Be civil
- Understand the difference between a joke and an insult.
- Do not harrass or attack members of the community for any reason.
- Leave remarks of "peasantry" to the PCMR community. If you dislike an OS/service/application, attack the thing you dislike, not the individuals who use it. Some people may not have a choice.
- Bigotry will not be tolerated.
- These rules are somewhat loosened when the subject is a public figure. Still, do not attack their person or incite harrassment.
3. Post Linux-related content
- Including Unix and BSD.
- Non-Linux content is acceptable as long as it makes a reference to Linux. For example, the poorly made mockery of
sudoin Windows. - No porn. Even if you watch it on a Linux machine.
4. No recent reposts
- Everybody uses Arch btw, can't quit Vim, and wants to interject for a moment. You can stop now.
Please report posts and comments that break these rules!
Important: never execute code or follow advice that you don't understand or can't verify, especially here. The word of the day is credibility. This is a meme community -- even the most helpful comments might just be shitposts that can damage your system. Be aware, be smart, don't fork-bomb your computer.
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
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:
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
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.
https://www.man7.org/linux/man-pages/man8/pivot_root.8.html
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:
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