[systemd-devel] Fwd: messing with .mount/.automount units

[arnaud gaboury]

On Sat, Jan 30, 2016 at 8:11 AM, Andrei Borzenkov <arvidjaar at gmail.com> wrote:
> 29.01.2016 23:07, arnaud gaboury пишет:
>> BUMP.
>>
>> I run once a week a simple backup with rsync. For that purpose, I
>> wrote a service file (rsync) and a timer unit. They both work with no
>> issues.
>>
>>  /etc/systemd/system/backup-external.service
>> ----------------------------------------------------
>> [Unit]
>> Description=Backup system to external drive
>> Requires=mnt-backup.mount
>
> Why you need it if you use automount anyway? /mnt/backup should be
> mounted on access. As is, I am not sure what effect it has.
>
>> After=mnt-backup.mount
>>
>> [Service]
>> Type=oneshot
>> ExecStart=/usr/bin/rsync -av --delete --exclude-from
>> /etc/conf.d/exclude-hortensia / /mnt/backup/hortensia
>> ExecStartPost=/usr/bin/umount /mnt/backup
>
> Same. I am not even sure whether it attempts to unmount underlying file
> system or autofs. You need to decicde whether you use automount or
> normal mount.
>
>> -----------------------------------------------------------------------------
>>
>> I would like to mount/umount the backup partition only when the
>> service is triggered. Backup partition is on a USB external drive and
>> LVM group.
>> My first attempt was to add this line in my /etc/fstab:
>> -------------------------------------------------------
>> UUID=868560c1-ab69-423f-b76d-b8ea5af1b066     /mnt/backup
>>   ext2    noauto,x-systemd.automount,x-systemd.device-timeout=5,x-systemd.idle-timeout=60
>>        0    2
>> -----------------------------------------------------------
>>
>> $ ls /run/systemd/generator
>> .....
>> mnt-backup.automount
>> mnt-backup.mount
>> ----------------------------------------
>>
>> For unknown reasons, the partition did mount at boot and never umount.
>
> Do you mean - you boot with USB stick inserted (before system power on)
> and after boot USB stick is mounted (not automounted)?

Yes, I boot with the external USB drive plugged. The drive is LVM
partitioned, and yes, the /mnt/backup is mounted with the above fstab
Could you show
> /proc/mounts output?
....................
systemd-1 /mnt/backup autofs
rw,relatime,fd=26,pgrp=1,timeout=60,minproto=5,maxproto=5,direct 0 0
.............................................
>
>> The only way I found to achieve my goal is:
>> - remove the entry in /etc/fstab
>> - copy the .mount and .automonut files in /etc/systemd/system
>>
>
> Copy from where? Please show these units you use now.

I copied then from /run/systemd/generator.

 % cat /run/systemd/generator/mnt-backup.automount
----------------------------------------------------------
# Automatically generated by systemd-fstab-generator

[Unit]
SourcePath=/etc/fstab
Documentation=man:fstab(5) man:systemd-fstab-generator(8)
Before=local-fs.target
[Automount]
Where=/mnt/backup
TimeoutIdleSec=1min
------------------------------------------------------------

% cat /run/systemd/generator/mnt-backup.mount
----------------------------------------------------------
# Automatically generated by systemd-fstab-generator

[Unit]
SourcePath=/etc/fstab
Documentation=man:fstab(5) man:systemd-fstab-generator(8)
Requires=systemd-fsck at dev-disk-by\x2duuid-868560c1\x2dab69\x2d423f\x2db76d\x2db8ea5af1b066.service
After=systemd-fsck at dev-disk-by\x2duuid-868560c1\x2dab69\x2d423f\x2db76d\x2db8ea5af1b066.service

[Mount]
What=/dev/disk/by-uuid/868560c1-ab69-423f-b76d-b8ea5af1b066
Where=/mnt/backup
Type=ext2
Options=noauto,x-systemd.automount,x-systemd.idle-timeout=60
----------------------------------------------------------------------------


>
> And does it unmount in this case after backup is finished?

YES
>
>> I have the expected behavior this way.
>> My question: is this the standard way and advised to do it? Why my
>> ftsab entry did not work?
>>
>
>
> What is your systemd version?
systemd 228-3


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