[systemd-devel] Template unit : specifier validity

[Nils Kattenbeck]

Hi,
systemd itself already uses them in those sections without problems so they
should definitely work:

systemd-zram-setup at .service:After=dev-%i.device
systemd-journald at .service:Requires=systemd-journald@%i.socket
systemd-journald-varlink@%i.socket
systemd-journald at .service:After=systemd-journald@%i.socket
systemd-journald-varlink@%i.socket
serial-getty at .service:After=dev-%i.device systemd-user-sessions.service
plymouth-quit-wait.service getty-pre.target
systemd-journald-sync at .service:Requires=systemd-journald@%i.socket
systemd-journald-varlink@%i.socket
systemd-journald-sync at .service:After=systemd-journald@%i.socket
systemd-journald-varlink@%i.socket
user at .service:After=systemd-logind.service user-runtime-dir@%i.service
dbus.service systemd-oomd.service
systemd-fsck at .service:After=%i.device systemd-fsck-root.service
local-fs-pre.target
quotaon at .service:After=systemd-quotacheck@%i.service %i.mount
systemd-pcrfs at .service:After=%i.mount tpm2.target systemd-pcrfs-root.service
systemd-quotacheck at .service:After=%i.mount
systemd-growfs at .service:After=systemd-repart.service %i.mount

Maybe you did not account for some of the escaping systemd does (esp.
slashes)? It could also be that you are using a very old systemd version
though I think this has been possible for ages if not forever.

Cheers, Nils



On Thu, Jan 16, 2025 at 1:30 PM Thomas HUMMEL <thomas.hummel at pasteur.fr>
wrote:

> Hello,
>
> Is the %i (or %I) specifier supposed to be valid for a template service
> unit for the Require= and After= directives ?
> It does not seem so in my tests
>
> Documentation states:
> "you may use the special "%i" specifier in many of the configuration
> options" but don't seem to detail which one exactly.
>
> It also states:
> "The following specifiers are interpreted in the Install section: %a,
> %b, %B, %g, %G, %H, %i, %j, %l, %m, %n, %N, %o, %p, %u, %U, %v, %w, %W, %%"
>
> But I think some are valid in (some) directives of the [Unit] or
> [Service] section.
>
> My use case would be to express a dynamic activation and order
> dependency on a device name known only at boot time.
>
>
> Thanks for your help
>
> --
> Thomas HUMMEL
> HPC Group
> Institut PASTEUR
> Paris, FRANCE
>
>
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