On May 30, 2010, at 18:03, Kirk Strauser wrote:
The "only one need" that it addresses is that now FreeBSD would come
with a built-in recovery system. Did a "make installworld" but
screwed something up and ended up with a non-bootable system? Pop in
a recovery CD and revert to the "4 hours ago" snapshot, then reboot.
Voila! It never happened. Accidentally deleted /etc/passwd? Retrieve
the version from /.zfs/snapshot/weekly-2010-21/etc/passwd . Just
realized that you deleted an important file 3 months ago and only
keep 2 weeks worth of backups? No problem, as long as you haven't
filled up your hard drive since then.
All scriptable.
For the case of "make installworld", a make.conf variable can be
created to run a "zfs snapshot" before any kind of 'make install';
this could be for both Ports and the base system. Portmanager and/or
portupgrade could also be expanded to optionally do this.
(Open)Solaris already has this with the Live Upgrade and boot
environment idea if you want a comparison:
http://docs.sun.com/app/docs/doc/820-5238/ggavn
http://docs.sun.com/app/docs/doc/819-2240/bootadm-1m
http://docs.sun.com/app/docs/doc/819-2379/gglaj
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