The Wanderer:
If the mount failing isn't that critical, then the "right way" to fix
> the problem under systemd's apparent design would probably be to add
> the "noauto" label to the fstab, so that the device will not mount
> automatically on boot.
Actually, that's just the widespread NON-systemd way of doing things,
for which systemd has such compatibility mechanisms as
systemd-fstab-generator, a program that reads /etc/fstab at bootstrap
and that generates a whole load of nonce units that translate fstab
records to the systemd way of doing things. Adding "noauto" and fixing
the erroneous device name so that it is correctly spelled is the way to
fix things even if one isn't using systemd at all.
The raw systemd way of doing things is mount and device units, per the
systemd.mount(5) and systemd.device(5) manual pages. In the raw systemd
way of doing things, there's a device unit named "dev-sde1.device" which
is a base requirement for a mount unit named
"media-lumix\x2dphotos.mount". If made by hand, they would look
something like:
# /etc/systemd/system/dev-sde1.device
[Unit]
Description=Device unit for %N
# /etc/systemd/system/media-lumix\x2dphotos.mount
[Unit]
Description=Mount unit for %N
# For exposition:
BindsTo=dev-sde1.device
[Install]
RequiredBy=local-fs.target
[Mount]
What=/dev/sde1
Where=%N
Type=vfat
Options=users,iocharset=utf8,umask=000
And these are, in essence, what systemd-fstab-generator and
systemd-udevd generate on the fly. There will be an auto-generated
/run/systemd/generator/media-lumix\x2dphotos.mount similar to the
above. If the fstab record is "auto" there will also be a symbolic link
in /run/systemd/generator/local-fs.target.requires pointing to the mount
unit. When the /dev/sde1 device appears, dev-sde1.device is
auto-generated and started by systemd-udevd.
Mounting and unmounting are thus start and stop actions on this unit:
* systemctl start media-lumix\x2dphotos.mount
* systemctl stop media-lumix\x2dphotos.mount
Turning bootstrap-time automatic startup on and off is simply a matter
of enabling and disabling the specified requires relationship from
local-fs.target:
* systemctl enable media-lumix\x2dphotos.mount
* systemctl disable media-lumix\x2dphotos.mount
One could even make an automount unit (which systemd-fstab-generator
auto-generates when it sees "x-systemd.automount" in an /etc/fstab record):
# /etc/systemd/system/media-lumix\x2dphotos.automount
[Unit]
Description=Automount unit for %N
[Automount]
Where=%N
[Install]
RequiredBy=local-fs.target
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