[systemd-devel] Stateless System Presets

[Ryan Gonzalez]

Could you use systemd-tmpfiles to set up the symlinks? I know OSTree-based
distros often use it to initialize symlinks on the rootfs.

On Thu, Aug 1, 2019, 12:05 PM Quinn Mikelson <quinn.mikelson at tyvak.com>
wrote:

> I work at a company who develops a number of semi-stateless systems. My
> current challenge is integrating out growing number of vendor-specific
> applications and services into a system with persistent /etc and /usr
> directories.
>
> These images are generated using Buildroot with initramfs filesystems; I'm
> using the term semi-stateless, because their /etc and /usr directories can
> be "patched" during runtime, but are otherwise refreshed upon each reboot.
>
> The specific services that get enabled on boot change from image to image,
> so I'd ideally like a single file to describe each image for ease of
> management.
>
> The system-preset mechanism seems like it was designed for this
> application, unfortunately it seems geared toward volatile systems, and
> only operates from within the running system after executing something like
> systemctl preset-all.
>
> Is there an accepted method of maintaining and applying a preset service
> during image packaging or upon system boot for stateless systems? My
> current solution is manually parsing the preset files with a custom script
> and creating or deleting symlinks accordingly.
>
> -Quinn
>
>
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