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services: Add dhcpd-service-type and <dhcpd-configuration>.

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* doc/guix.texi (Networking Services): Document it.
* gnu/services/networking.scm (dhcpd-service-type): Add it.
(dhcpd-configuration, dhcpd-configuration?): Add it.
(dhcpd-configuration-package): Add it.
(dhcpd-configuration-config-file): Add it.
(dhcpd-configuration-version): Add it.
(dhcpd-configuration-run-directory): Add it.
(dhcpd-configuration-lease-file): Add it.
(dhcpd-configuration-pid-file): Add it.
(dhcpd-configuration-interfaces): Add it.
* gnu/tests/networking.scm (minimal-dhcpd-v4-config-file)
(dhcpd-v4-configuration, %dhcpd-os, run-dhcpd-test, %test-dhcpd): New
variables.
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doc/guix.texi
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@ -10694,6 +10694,51 @@ Return a service that runs @var{dhcp}, a Dynamic Host Configuration
Protocol (DHCP) client, on all the non-loopback network interfaces.
@end deffn
@deffn {Scheme Procedure} dhcpd-service-type
This type defines a service that runs a DHCP daemon. To create a
service of this type, you must supply a @code{<dhcpd-configuration>}.
For example:
@example
(service dhcpd-service-type
(dhcpd-configuration
(config-file (local-file "my-dhcpd.conf"))
(interfaces '("enp0s25"))))
@end example
@end deffn
@deftp {Data Type} dhcpd-configuration
@table @asis
@item @code{package} (default: @code{isc-dhcp})
The package that provides the DHCP daemon. This package is expected to
provide the daemon at @file{sbin/dhcpd} relative to its output
directory. The default package is the
@uref{http://www.isc.org/products/DHCP, ISC's DHCP server}.
@item @code{config-file} (default: @code{#f})
The configuration file to use. This is required. It will be passed to
@code{dhcpd} via its @code{-cf} option. This may be any ``file-like''
object (@pxref{G-Expressions, file-like objects}). See @code{man
dhcpd.conf} for details on the configuration file syntax.
@item @code{version} (default: @code{"4"})
The DHCP version to use. The ISC DHCP server supports the values ``4'',
``6'', and ``4o6''. These correspond to the @code{dhcpd} program
options @code{-4}, @code{-6}, and @code{-4o6}. See @code{man dhcpd} for
details.
@item @code{run-directory} (default: @code{"/run/dhcpd"})
The run directory to use. At service activation time, this directory
will be created if it does not exist.
@item @code{pid-file} (default: @code{"/run/dhcpd/dhcpd.pid"})
The PID file to use. This corresponds to the @code{-pf} option of
@code{dhcpd}. See @code{man dhcpd} for details.
@item @code{interfaces} (default: @code{'()})
The names of the network interfaces on which dhcpd should listen for
broadcasts. If this list is not empty, then its elements (which must be
strings) will be appended to the @code{dhcpd} invocation when starting
the daemon. It may not be necessary to explicitly specify any
interfaces here; see @code{man dhcpd} for details.
@end table
@end deftp
@defvr {Scheme Variable} static-networking-service-type
This is the type for statically-configured network interfaces.
@c TODO Document <static-networking> data structures.