I am having the same issue with canmount=on switching to canmount=noauto on a
user's dataset, and I'm using the final release of 19.10, so perhaps this will
help.
Version Details:
------------------------------------------------------------------------
v-eight# cat /etc/issue.net
Ubuntu 19.10
v-eight# dpkg -l zfs\* zsys | grep ^ii
ii zfs-auto-snapshot 1.2.4-2 all ZFS automatic snapshot
service
ii zfs-initramfs 0.8.1-1ubuntu14.2 amd64 OpenZFS root filesystem
capabilities for Linux - initramfs
ii zfs-zed 0.8.1-1ubuntu14.2 amd64 OpenZFS Event Daemon
ii zfsutils-linux 0.8.1-1ubuntu14.2 amd64 command-line tools to
manage OpenZFS filesystems
ii zsys 0.2.2+19.04 amd64 ZFS SYStem integration
Here's how it all went down:
-------------------------------------
I did a full disk ZFS install, then I installed zsys.
I wanted an encrypted home dir, so I created a new dataset
(rpool/USERDATA/bfinley-encrypted) and copied all of my data into it.
As a side note, I configured boot time decryption as per option 3 in
chungy's HOWTO (https://github.com/chungy/zfs-boottime-encryption). This
is working great and keys are successfully loaded at boot time. Also, a
second encrypted non-homedir dataset I created at the same time is
successfully mounted automatically
(rpool/ROOT/ubuntu_rkiozo/var/lib/mlocate), and retains it's 'canmount=on'
setting.
I then changed the mountpoint for the system created homedir dataset from
'/home/bfinley' to 'none'.
And changed the mountpoint for the new homedir dataset from
'/home/bfinley-encrypted' to '/home/bfinley' and set it to 'canmount=on'.
After rebooting, the mlocate dataset mounted automatically, but the homedir
dataset did not. 'zfs get keystatus rpool/USERDATA/bfinley' showed
'available', but 'canmount' had been changed to 'noauto'.
At this point, I could 'zfs set canmount=on rpool/USERDATA/bfinley' and do a
'zfs mount -a', and it would mount.
But again, after reboot, 'canmount=on' was changed to 'canmount=noauto'.
So, I looked for other differences in the settings between the system created
homedir and new new one. The system created homedir has these additional
settings:
com.ubuntu.zsys:bootfs-datasets rpool/ROOT/ubuntu_rkiozo
org.zsys:bootfs-datasets rpool/ROOT/ubuntu_rkiozo
com.ubuntu.zsys:last-used 1577134248
Based on that discovery, I added the first to settings to my new dataset
(omitting the third, as I expected it would be added automatically via zsys)
and rebooted.
zfs set com.ubuntu.zsys:bootfs-datasets=rpool/ROOT/ubuntu_rkiozo
rpool/USERDATA/bfinley
zfs set org.zsys:bootfs-datasets=rpool/ROOT/ubuntu_rkiozo
rpool/USERDATA/bfinley
After reboot, my new encrypted homedir was mounted automatically!
As a side note, I took a look and 'com.ubuntu.zsys:last-used' was indeed
automatically set with a timestamp.
SOLUTION and Conclusions
------------------------------------------------------------------------
1) I now have a solution to the problem at hand, and hopefully others do too.
The solution summary for me was to set 'com.ubuntu.zsys:bootfs-datasets' and
'org.zsys:bootfs-datasets' to my root dataset as above.
NOTE: If you are following this to fix your own system, your root dataset
will (almost certainly) have a different name. To find it, you can do this:
zfs list -r rpool/ROOT | grep -w /
2) Although it now works for me, I think we should consider the implementation
broken. While it makes sense that zsys would look for certain ZFS User
Properties to choose which datasets to act on, I don't think it should
automatically change any dataset setting that is not a ZFS User Property
that it "owns".
Ideas to reconcile the behavior:
- If canmount=noauto is required for zsys to do it's thing, and canmount is
set to anything else, it should simply NOT do it's thing, and log a
useful message to syslog.
- Include a command to zsys-ize a dataset. Something like:
zsys set type=TYPE DATASET
Where TYPE is the type of dataset, from a zsys perspective.
Current options include: bootfs-datasets, none.
Where DATASET is the name of the dataset for zsys to manage.
Example: zsys set type=bootfs-datasets
rpool/USERDATA/bfinley
Cheers! -Brian
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https://bugs.launchpad.net/bugs/1849179
Title:
canmount property switches to noauto in user's home dataset
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