guix/documentation-manual — Japanese @ Fedora Weblate: service type

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	English	Japanese	Actions
	(service? s) @result{} #t
	(eq? (service-kind s) nginx-service-type) @result{} #t
	The @code{modify-services} form provides a handy way to change the parameters of some of the services of a list such as @code{%base-services} (@pxref{Base Services, @code{%base-services}}). It evaluates to a list of services. Of course, you could always use standard list combinators such as @code{map} and @code{fold} to do that (@pxref{SRFI-1, List Library,, guile, GNU Guile Reference Manual}); @code{modify-services} simply provides a more concise form for this common pattern.
	modify-services services @
	(type variable => body) @dots{}
	Modify the services listed in @var{services} according to the given clauses. Each clause has the form:
	(@var{type} @var{variable} => @var{body})
	where @var{type} is a service type---e.g., @code{guix-service-type}---and @var{variable} is an identifier that is bound within the @var{body} to the service parameters---e.g., a @code{guix-configuration} instance---of the original service of that @var{type}.
	The @var{body} should evaluate to the new service parameters, which will be used to configure the new service. This new service will replace the original in the resulting list. Because a service's service parameters are created using @code{define-record-type}, you can write a succinct @var{body} that evaluates to the new service parameters by using the @code{inherit} feature that @code{define-record-type} provides.
	Clauses can also have the following form:
	(delete @var{type})
	Such a clause removes all services of the given @var{type} from @var{services}.
	@xref{Using the Configuration System}, for example usage.
	Next comes the programming interface for service types. This is something you want to know when writing new service definitions, but not necessarily when simply looking for ways to customize your @code{operating-system} declaration.
	{Data Type} service-type
	service type
	This is the representation of a @dfn{service type} (@pxref{Service Types and Services}).
	This is a symbol, used only to simplify inspection and debugging.
	extensions
	A non-empty list of @code{<service-extension>} objects (see below).
	@code{compose} (default: @code{#f})
	If this is @code{#f}, then the service type denotes services that cannot be extended---i.e., services that do not receive ``values'' from other services.
	Otherwise, it must be a one-argument procedure. The procedure is called by @code{fold-services} and is passed a list of values collected from extensions. It may return any single value.
	@code{extend} (default: @code{#f})
	If this is @code{#f}, services of this type cannot be extended.
	Otherwise, it must be a two-argument procedure: @code{fold-services} calls it, passing it the initial value of the service as the first argument and the result of applying @code{compose} to the extension values as the second argument. It must return a value that is a valid parameter value for the service instance.
	This is a string, possibly using Texinfo markup, describing in a couple of sentences what the service is about. This string allows users to find about the service through @command{guix system search} (@pxref{Invoking guix system}).
	@code{default-value} (default: @code{&no-default-value})
	The default value associated for instances of this service type. This allows users to use the @code{service} form without its second argument:
	(service @var{type})
	The returned service in this case has the default value specified by @var{type}.

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