Am 26.01.2014 21:13, schrieb Chris Murphy: > On Jan 26, 2014, at 11:41 AM, Simo Sorce <simo@xxxxxxxxxx> wrote: > >> I never said it won't work in absolute, it probably will work ok in many >> cases, just to cause incredible issues in others. >> >> It is a fine tool in the hands of an expert that knows how to check >> whether reverting to a snapshot is safe. > > Why is the snapshot case any different from a user who reverts doing a clean install or yum downgrade? because the snapshot restores *a whole filesystem* and not only the affected application? * restore a snapshot of /usr and you have fun with /var/lib/rpm * restore a snapshot of /var/lib/ without /usr and you have fun with the rpmdb and others * restore a snapshot of /usr without /etc and you *may have* random fun and there are *hundrets* of such combinations where the last thing you really would want is restore a snapshot because you have no plan about the real-world impact in doing so >> It is not going to be a good solution for non-expert users though >> *unless* you provide system APIs that *all* applications use to signal >> when they are doing irreversible changes so that the user can be warned >> about potential data loss right when he asks the system to revert a >> snapshot. > > Developers should not be sneak attacking non-expert users with file format changes that aren't well > announced in advance of consequences they probably won't be able to read their data if they downgrade > the application the perfect world won't happen, sad but true
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