The udev-configuration record now has a hardware field.
The contents of the /etc/udev directory now includes hwdb.bin, which is
computed when the system is instanciated (prior to system activation). The
hardware description files used to generate hwdb.bin are not installed in
/etc, because they are not required at run-time.
The documentation has been reworked so as to explain why creating udev rules
or hardware needs helper functions for configuration or extension.
* gnu/services/base.scm (udev-hardware): New function.
(file->udev-hardware): New function.
(udev-hardware-service): New function.
(udev-etc): Add hwdb.d and hwdb.bin.
(module): Export udev-hardware, file->udev-hardware, and udev-hardware-service.
(<udev-configuration>): Add the native-udev field.
(udev-service-type) [extend]: Populate the hardware field.
* doc/guix.texi (Base Services)[udev-service-type]: Explain configuration and
extension values.
* doc/guix.texi (Base Services)[udev-hardware]: Document it.
[udev-hardware-service]: Same.
* doc/guix.texi (Base Services)[udev-configuration]: Document the native-udev
field.
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