Just listing the current possible methods for configuring /sys (I
haven't tried all of them):
* Configuring a custom systemd service to run on boot that just executes
something like `bash -c 'echo ... > /sys...`
* Setting up a udev rule: http://serverfault.com/a/636759/147813
* Use systemd's tmpfiles.d and write a rule that writes a parameter to
/sys: http://www.freedesktop.org/software/systemd/man/tmpfiles.d.html
* Use `/etc/sysfs.conf` or `/etc/sysfs.d/` and package up the systemd
sysfsutils.service (this doesn't exist in Nix/NixOS currently).
Perhaps the primitive in Nix could use of them as a backing. The
configuration primitive could be`boot.kernel.sys` or `boot.sys`.
On 24/05/2015 3:25 AM, Roger Qiu wrote:
Hi,
I was wondering if there was a particular Nix/NixOS configuration
primitive that allowed direct & permanent editing of arbitrary sysfs
`/sys` parameters?
Currently it seems that it's possible by creating custom systemd
services (or maybe a udev rule) that run at boot which set the
settings, or you could use `|/etc/sysfs.conf|.` or `/etc/sysfs.d/`
(but I'm not sure if these are enabled in NixOS).
Unlike sysctl settings which are clearly explained in the
documentation, it's not clear where the canonical place to set `/sys`
settings should be such as CPU frequency.. etc.
Thanks,
Roger
--
Founder of Matrix AI
http://matrix.ai/
+61420925975
--
Founder of Matrix AI
http://matrix.ai/
+61420925975
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