https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260160
--- Comment #24 from Jim Long <freebsd-bugzi...@umpquanet.com> ---
Thanks to everyone who has contributed to the significant progress on this
issue.
It definitely feels like progress, but IMO it would be infinitely better if the
"zfs.mount_snapshot" attribute was honored at startup. I'll spend some time
thinking about how to write a service script that can either piggy-back on
/etc/rc.d/jail or a patch to /etc/rc.d/jail that will incorporate the "jail -m"
in the start-up process. But "The Right Thing" would certainly seem to be to
have /etc/rc.d/jail honor the settings placed in /etc/jail.conf.
Interestingly, my testing suggests that once a "jail -m" operation has been
done, the mount_snapshot setting somehow survives any subsequent destruction
and re-creation of the jail.
Here's a dialogue commenced shortly after a fresh boot:
# w
12:26PM up 54 secs, 3 users, load averages: 0.89, 0.24, 0.09
USER TTY FROM LOGIN@ IDLE WHAT
jim v0 - 12:26PM - /bin/sh /usr/local/bin/startx
jim pts/0 :0 12:26PM - -
jim pts/1 :0 12:26PM - w
# jls
JID IP Address Hostname Path
1 192.168.1.50 test.example.edu /jail/test
2 192.168.1.50 test2.example.edu /jail/test2
# jexec test ls -ld /.zfs/snapshot/xfer
ls: /.zfs/snapshot/xfer: Operation not permitted
# jexec test2 ls -ld /.zfs/snapshot/xfer
ls: /.zfs/snapshot/xfer: Operation not permitted
# jail -m test
test: updated
# jail -m test2
test2: updated
# jexec test ls -ld /.zfs/snapshot/xfer
drwxr-xr-x 33 root wheel 38 Feb 6 10:22 /.zfs/snapshot/xfer
# jexec test2 ls -ld /.zfs/snapshot/xfer
drwxr-xr-x 33 root wheel 38 Feb 6 10:22 /.zfs/snapshot/xfer
The odd thing to me is that once "jail -m" has been performed, the change
persists even beyond the destruction and re-creation of either jail. Here I
stop jail 1 and jail 2, then start jail 3 and jail 4. Without any "jail -m"
command, jails 3 and 4 are able to see snapshots:
# jls
JID IP Address Hostname Path
1 192.168.1.50 test.example.edu /jail/test
2 192.168.1.50 test2.example.edu /jail/test2
# service jail stop
Stopping jails: test test2.
# service jail start
Starting jails: test test2.
# jls
JID IP Address Hostname Path
3 192.168.1.50 test.example.edu /jail/test
4 192.168.1.50 test2.example.edu /jail/test2
# jexec test ls -ld /.zfs/snapshot/xfer
drwxr-xr-x 33 root wheel 38 Feb 6 10:22 /.zfs/snapshot/xfer
# jexec test2 ls -ld /.zfs/snapshot/xfer
drwxr-xr-x 33 root wheel 38 Feb 6 10:22 /.zfs/snapshot/xfer
Thanks again to Allan, Martin, Ryan, and everyone else for their time and
expertise.
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