[OpenWrt-Devel] [RFC] replace outdated udev by eudev?

Daniel Golle daniel at makrotopia.org
Sun Feb 7 04:53:41 EST 2016

Hi John!

On Sun, Feb 07, 2016 at 10:28:25AM +0100, John Crispin wrote:
> maybe i am missing the point but why would you want udev on your system
> in the first place ?

There are situations when udev is currently the only way, such are:
* more than one 3g/wwan/usb-serial device and the need to differentiate
  them based on their serial number rather than on the order the kernel
  probes them.
  I really like those /dev/serial/by-id/ symlinks, because they prevent
  comgt to try speaking with my solar-charger and collectd from trying
  to query battery-voltage and PWM currents from the 3G modem -- both
  are detected as usb-serial devices, thus /dev/ttyUSB* device nodes
  are created in the order they are probed -- which differs e.g.
  depending on cold start or warm reset of the OS.
* similar things apply when having multiple V4L, ALSA or HID devices...
* udev rules are needed for certain USB devices to be accessible for
  non-root users

I agree that the both implementations (udev and eudev) are over-bloated
and I'm sure that the use-cases I'm interested in can be provided by
a few dozend lines of code and a few kilobytes in binary instead of
that 1.2M executable which includes support for all sorts of weird
legacy stuff like 3.5" floppy drivers conencted via USB...


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