[systemd-devel] Help: Questions regarding systemd service order

[Silvio Knizek]

Am Dienstag, dem 12.11.2024 um 02:13 -0800 schrieb Tony Rodriguez:
> ```
> Hoping I can accomplish the following via a simple UNIT modification or 
> service script?
> 
> 
> Questions:
> 
> A)  How can my service always runs "last" within local-fs-pre.target?
> 
> For Example:
> 
> Need my service to always run last within the local-fs-pre.target, even 
> if others add another services later within local-fs-pre.target. Still 
> want my service to always run last within this local-fs-pre.target.
> 
> Note: I will not know services others may later add within the 
> local-fs-pre.target
> 
> 
> B) How can I make my service run after all .mount(s) within 
> local-fs-pre.target, before local-fs.target, especially if I don't know 
> all the .mount(s)?  The .mount files are located within 
> /var/run/systemd/generator/*
> 
> ls -l /var/run/systemd/generator/*.mount
> -rw-r--r-- 1 root root 390 Nov 12 00:59 
> /var/run/systemd/generator/boot-efi.mount
> -rw-r--r-- 1 root root 449 Nov 12 00:59 
> /var/run/systemd/generator/boot.mount
> -rw-r--r-- 1 root root 428 Nov 12 00:59 
> /var/run/systemd/generator/home.mount
> -rw-r--r-- 1 root root 239 Nov 12 00:59 /var/run/systemd/generator/-.mount
> -rw-r--r-- 1 root root 424 Nov 12 00:59 /var/run/systemd/generator/tmp.mount
> -rw-r--r-- 1 root root 241 Nov 12 00:59 /var/run/systemd/generator/usr.mount
> -rw-r--r-- 1 root root 424 Nov 12 00:59 /var/run/systemd/generator/var.mount
> 
> -rw-r--r-- 1 root root 424 Nov 12 00:59 
> /var/run/systemd/generator/test.mount
> 
> 
> Appears the UNIT section doesn't support a wildcard for .mount(s)
> 
> This doesn't work
> 
> #After=local-fs-pre.target *.mount
> 
> The following works, but have to hard code mounts. Would like to 
> dynamically populate mounts for "After=" within my service file.
> 
> After=local-fs-pre.target boot.mount boot-efi.mount -.mount usr.mount 
> var.mount tmp.mount home.mount
> Before=local-fs.target
> 
> [Unit]
> Description=mytest.service
> DefaultDependencies=no
> Wants=local-fs-pre.target
> After=local-fs-pre.target boot.mount boot-efi.mount -.mount usr.mount 
> var.mount tmp.mount home.mount test.mount
> Before=local-fs.target
> ```

Hi Tony,

there is no "last", because every dependency can exists multiple times, but you can't have multiple "last". Doesn't make sense.

My suggestion would either be <man:systemd.automount> (via <man:fstab>) or [RequiresMountsFor=](man:systemd.unit).

For further help we would need to know what you actually want to achieve with your unit.

BR  
Silvio
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