On Thu, May 14, 2015, at 04:30 PM, JT Olds wrote: > >> Since you are reinstalling anyways, I'd suggest trying out btrfs >> as your >> filesystem. Create separate subvolumes for each OS and you can get rid of >> chrooting anything. Plus, you can share your home subvolume if you like. > > To be totally honest, I was trying this out mainly because we're > evaluating how to do an inplace upgrade for a bunch of consumer > devices we run that use Wheezy to Jessie. My laptop happened to be > Wheezy so I took the plunge with our planned upgrade path. > > I work at Space Monkey and we have all these little NAS devices that > are on Wheezy and we were dumb and didn't leave space for another full > os-root partition anywhere. > > So repartitioning is off the table (we could brick users' devices with > users power cycling due to being upset with waiting), but Wheezy ain't > gonna last forever, and we'd love to get some Jessie systemd hotness. > We're looking for a way to do a full system upgrade that can happen > relatively atomically, and I think we might be on to something with > pivot_root.
This is one of the use cases that https://live.gnome.org/Projects/OSTree is designed for. A recent thread is: https://mail.gnome.org/archives/ostree-list/2015-May/msg00013.html
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