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| -rw-r--r-- | doc/guix.texi | 55 |
1 files changed, 42 insertions, 13 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index 2a97516084..6b66aef215 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -5700,17 +5700,23 @@ above, such as @code{host-name} and @code{bootloader}, are mandatory. Others, such as @code{packages} and @code{services}, can be omitted, in which case they get a default value. +Below we discuss the effect of some of the most important fields +(@pxref{operating-system Reference}, for details about all the available +fields), and how to @dfn{instantiate} the operating system using +@command{guix system}. + +@unnumberedsubsubsec Globally-Visible Packages + @vindex %base-packages -The @code{packages} field lists -packages that will be globally visible on the system, for all user -accounts---i.e., in every user's @code{PATH} environment variable---in -addition to the per-user profiles (@pxref{Invoking guix package}). The -@var{%base-packages} variable provides all the tools one would expect -for basic user and administrator tasks---including the GNU Core -Utilities, the GNU Networking Utilities, the GNU Zile lightweight text -editor, @command{find}, @command{grep}, etc. The example above adds -tcpdump to those, taken from the @code{(gnu packages admin)} module -(@pxref{Package Modules}). +The @code{packages} field lists packages that will be globally visible +on the system, for all user accounts---i.e., in every user's @code{PATH} +environment variable---in addition to the per-user profiles +(@pxref{Invoking guix package}). The @var{%base-packages} variable +provides all the tools one would expect for basic user and administrator +tasks---including the GNU Core Utilities, the GNU Networking Utilities, +the GNU Zile lightweight text editor, @command{find}, @command{grep}, +etc. The example above adds tcpdump to those, taken from the @code{(gnu +packages admin)} module (@pxref{Package Modules}). @findex specification->package Referring to packages by variable name, like @var{tcpdump} above, has @@ -5732,6 +5738,8 @@ version: %base-packages))) @end lisp +@unnumberedsubsubsec System Services + @vindex %base-services The @code{services} field lists @dfn{system services} to be made available when the system starts (@pxref{Services}). @@ -5780,10 +5788,24 @@ more, would look like this: @xref{Desktop Services}, for the exact list of services provided by @var{%desktop-services}. @xref{X.509 Certificates}, for background information about the @code{nss-certs} package that is used here. -@xref{operating-system Reference}, for details about all the available -@code{operating-system} fields. -Assuming the above snippet is stored in the @file{my-system-config.scm} +Again, @var{%desktop-services} is just a list of service objects. If +you want to remove services from there, you can do so using the +procedures for list filtering (@pxref{SRFI-1 Filtering and +Partitioning,,, guile, GNU Guile Reference Manual}). For instance, the +following expression returns a list that contains all the services in +@var{%desktop-services} minus the Avahi service: + +@example +(remove (lambda (service) + (eq? (service-kind service) avahi-service-type)) + %desktop-services) +@end example + +@unnumberedsubsubsec Instantiating the System + +Assuming the @code{operating-system} declaration +is stored in the @file{my-system-config.scm} file, the @command{guix system reconfigure my-system-config.scm} command instantiates that configuration, and makes it the default GRUB boot entry (@pxref{Invoking guix system}). @@ -5805,6 +5827,8 @@ something went wrong with the latest generation. Reassuring, no? The @command{guix system list-generations} command lists the system generations available on disk. +@unnumberedsubsubsec The Programming Interface + At the Scheme level, the bulk of an @code{operating-system} declaration is instantiated with the following monadic procedure (@pxref{The Store Monad}): @@ -5818,6 +5842,11 @@ the packages, configuration files, and other supporting files needed to instantiate @var{os}. @end deffn +This procedure is provided by the @code{(gnu system)} module. Along +with @code{(gnu services)} (@pxref{Services}), this module contains the +guts of GuixSD. Make sure to visit it! + + @node operating-system Reference @subsection @code{operating-system} Reference |