Just a wild guess, but I'd start with a combination of one of those:
# -----
[Unit]
Description=my service
Before=network.target
Before=systemd-networkd.service
Before=network-online.target
Before=systemd-networkd-wait-online.service
...
[Install]
WantedBy=Basic.target
# -----
Probably someone will kill me for the basic target, which is fine, as
long as the proper one is provided as well, and preferably with an
explanation :)
In fact, probably I'd create a new, dedicated target for that, like
my.target.
And if your script HAS to be finished, for networking to be run at all,
you might want to add a drop in to systemd-networkd.service
# -----
systemctl edit systemd-networkd.service
[Unit]
Requires=my.service
After=my.service
# -----
This is most likely not a final solution, but a way I would approach
this matter and start to play.
F.e., I am not sure, wether the drop in should really be for
systemd-networkd.service or rather network.target. Play around.
And I am assuming, you are using systemd-networkd, and not something
else like networkmanager, in that case you have to adapt, of course.
Until someone with proper knowledge replies, good luck and report back
Am 27.06.20 um 10:34 schrieb Mark Rogers:
This feels like something I should be easily able to answer from
documentation/Google, and failing that from somewhere like
StackOverflow, without troubling systemd-devel, but all my efforts
have thus far failed [1]
What is the correct way to ensure a script runs to completion before
any networking units start? "The Internet" is abound with people
asking the opposite question which hasn't helped my keyword-based
searches.
My use case (on a Raspberry Pi running Raspbian if it matters) is that
I have network settings stored in a database from which I generate
network configuration files (eg dhcpcd.conf) on boot, therefore they
obviously need to be in place before dhcpcd starts. (Similarly
wpa_supplicant.)
Ideally I'd like to be agnostic about the actual network stack in my
unit configuration (so not setting dependencies relating to dhcpcd,
for example) but at this point I've tried pretty much everything
without success so I'm obviously doing something stupid.
I have tried multiple approaches so far but by current service file
looks like this:
[Unit]
Description=Config generation from DB
Before=networking.service
[Service]
Type=oneshot
ExecStart=/home/mark/bin/db2config.py
[Install]
RequiredBy=network.target
[1]
https://stackoverflow.com/questions/62574482/ensuring-that-a-systemd-unit-starts-before-any-networking
- no responses there to date, feel free to respond there for
reputation or else I'll update it when I solve it.
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