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Would an approach like this not also serve your needs? https://www.unix.com/man-page/FreeBSD/8/rescue/ https://www.unix.com/man-page/FreeBSD/8/rescue/

• dale_glass 6y ago
  There's other approaches would work for me, yes. I could also download a tar file with what's missing and unpack it over root, I suppose. But then root would need to be read-write, like your solution also requires. Also, FreeBSD wouldn't work. We use many Linux specific features, and I have no interest whatsoever in porting all that stuff to BSD for no gain in functionality. Also, I see no issue to somebody else solving my problems and not needing to write more stuff that's unrelated to the actual purpose of what I'm doing.