Hi,
> Is it possible, with current btrfs:
Yes, I think so.
> - to take a rootfs snapshot (i.e. prior to a major update),
btrfsctl -s newsnap /
> - do changes in the root filesystem (i.e. install major update),
>
> - if we don't like what the major update did to the system
> (rootfs), "rollback" the snapshot and make it the "original"
> rootfs again (perhaps, with a reboot in between).
Before rebooting, edit whatever mounts your root partition (initrd,
fstab, kernel argument) to add a "subvol=newsnap" mount argument.
An obvious way to make this nicer would be to:
* have the package manager create the snapshot before modifying the
system, with a timestamp.
* modify the bootloader to give a choice of snapshots at boot-time.
Note that you're rolling back *all* rootfs changes, not merely the
changes that the package manager made, so it wouldn't be correct to
think of this as a way to only rollback package manager transactions.
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx>
One Laptop Per Child
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