Reported by Scott McDonough <smcdonough1@gmail.com>
in <http://bugs.gnu.org/20582>.
* doc/guix.texi (System Installation): Suggested setting the interface
up before running 'dhclient'.
* guix/scripts/publish.scm (show-help, %options): Add --listen.
(getaddrinfo*): New procedure.
(%default-options): Add 'address'.
(open-server-socket): Replace 'addr' and 'port' with 'address', a
sockaddr.
(guix-publish): Adjust accordingly. Augment "publishing" message with
the actual address.
* doc/guix.texi (Invoking guix publish): Document it.
* guix/scripts/publish.scm (show-help): Add --user.
(%options): Likewise.
(run-publish-server): Change 'port' parameter to 'socket'. Pass
#:socket instead of #:addr and #:port to 'run-server'. Update caller
accordingly.
(open-server-socket, gather-user-privileges): New procedures.
(guix-publish): Use them. Force %PRIVATE-KEY and %PUBLIC-KEY early
on. Warn when running as root.
* doc/guix.texi (Invoking guix publish): Document --user.
* doc/guix.texi (Using the Configuration System): Add xref to "X.509
Certificates".
(X.509 Certificates): New section.
* gnu/system/examples/desktop.tmpl: Use NSS-CERTS.
* doc/guix.texi (System Installation): Add xref to "Using the
Configuration System" instead of including one here.
(Using the Configuration System): Remove first example, and include
os-config-bare-bones.texi instead. Include os-config-desktop.texi as
a second example.
* doc.am (OS_CONFIG_EXAMPLES_TEXI): New variable.
(BUILT_SOURCES, EXTRA_DIST, MAINTAINERCLEANFILES): Use it.
(doc/os-config.texi): Remove.
(doc/os-config-%.texi): New target.
* gnu/system/install.scm (configuration-template-service): Remove
'local-template' and 'template'. Add 'search' and 'templates'.
[activate]: Copy all of TEMPLATES to /etc/configuration.
* doc/guix.texi (System Installation): Adjust file name accordingly.
* gnu/services/colord.scm, gnu/services/dbus.scm,
gnu/services/upower.scm: Remove.
* gnu/services/desktop.scm: New file, with contents taken from the above
files.
* gnu-system.am (GNU_SYSTEM_MODULES): Adjust accordingly.
* doc/guix.texi (Desktop Services): New section.
(Various Services): Move colord-service and upower-service from
here to "Desktop Services".
Reported by Christopher A. Webber <cwebber@dustycloud.org>.
* doc/guix.texi (The Store Monad): Reintroduce 'mlet' in 'sh-symlink'
example. Move the simplified version below. Explain that the 'store'
parameter is threaded.
* doc/guix.texi (The Store Monad): Replace reference to "profile.sh",
which is not defined until the next node, with "sh-symlink", which
is defined immediately above
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
* gnu/packages.scm (find-packages-by-name): Sort MATCHING according to
'version>?'. Use 'string-prefix?' instead of 'string=?' to compare
against VERSION.
* doc/guix.texi (Invoking guix package): Add example and explanation.
* guix/scripts/refresh.scm (guix-refresh): Use 'specification->package'
instead of 'find-packages-by-name'. This allows users to specify
things like "qt-4.8.6".
* doc/guix.texi (Invoking guix refresh): Add an example.
* guix/scripts/package.scm (%options): Add the '--do-not-upgrade' option.
(show-help): Document it.
(options->installable): Add 'do-not-upgrade-regexps' variable.
Use it in 'packages-to-upgrade'.
* doc/guix.texi (Invoking guix package): Document the '--do-not-upgrade'
option.
* doc/guix.texi (Name Service Switch): Add link to nss-mdns. Add
example show how to pass #:name-services to 'nscd-service'.
(Base Services): Add link from 'nscd-service' to the above.
* gnu/services/base.scm (nscd-service): Update docstring accordingly.
Fixes <http://bugs.gnu.org/19795>.
Reported by David Thompson <dthompson2@worcester.edu>.
* gnu/build/activation.scm (enumerate, current-users, current-groups,
delete-user, delete-group): New procedures.
(activate-users+groups): Add calls to 'delete-user' and
'delete-group'.
* doc/guix.texi (User Accounts): Add a paragraph about statelessness.
Explain that passwords are preserved.
* guix/gexp.scm (<local-file>): New record type.
(local-file): New procedure.
(local-file-compiler): New compiler.
(gexp->sexp) <struct? thing>: Handle the case where 'lower' returns a
file name.
(text-file*): Update docstring.local-file doc
* tests/gexp.scm ("one local file", "gexp->derivation, local-file"): New
tests.
* doc/guix.texi (G-Expressions): Mention local files early. Document
'local-file'. Update 'text-file*' documentation.
This is a followup to bcb1328.
* doc/guix.texi (G-Expressions): Move paragraph about extensibility
below. Remove assumptions that things are either packages or
derivations.
From now own, (guix packages) depends on (guix gexps); it was the other
way around now. This means that (guix packages) code can use gexps.
* guix/gexp.scm (origin-compiler, package-compiler): Remove.
(default-guile-derivation): New procedure.
(gexp->derivation): Use it instead of 'default-guile' +
'package->derivation'.
* guix/packages.scm (default-guile-derivation): New procedure.
(package-compiler, origin-compiler): New variables.
* doc/guix.texi (G-Expressions): Mention extensibility.
That makes WindowMaker the default session, by default.
* gnu/services/xorg.scm (xsessions-directory)[builder]: Prepend a number
in the file name to preserve the order of SESSIONS.
(slim-service): Augment docstring.
* doc/guix.texi (X Window): Adjust accordingly.
* guix/store.scm (text-file): Add optional 'references' parameter. Pass
it to 'add-text-to-store'.
* doc/guix.texi (The Store Monad): Adjust accordingly.
* gnu/services/base.scm (nscd-service): Add #:name-services parameter.
In 'start' field, set LD_LIBRARY_PATH based on #:name-services.
* doc/guix.texi (Base Services): Document it.
(Name Service Switch): Link to 'nscd-service'.
* gnu/services/xorg.scm (<session-type>): New record type.
(%windowmaker-session-type, %ratpoison-session-type): New variables.
(%default-xsessions): Use them.
(xsessions-directory): Expect SESSIONS to be a list of <session-type>
and rewrite accordingly.
(slim-service): Adjust docstring.
* doc/guix.texi (X Window): Update accordingly.
* doc/guix.texi (Introduction): Introduce "Guix System Distribution".
Add a couple of sentences about it. Remove "Guixotic".
(GNU Distribution): Likewise.
(System Installation): Ditto.
* doc/guix.texi (The Store Monad): Document '%state-monad' and related
procedures. Describe '%store-monad' as an alias for '%state-monad'.
* guix/monads.scm: Update commentary.
* doc/guix.texi (GNU Distribution): Explain what "Guixotic" is.
(System Installation): Replace "the GNU system" by "Guixotic".
(System Configuration): Likewise.
(Invoking guix system): Likewise.
* gnu/packages/bootstrap/armhf-linux/bash,
gnu/packages/bootstrap/armhf-linux/mkdir,
gnu/packages/bootstrap/armhf-linux/tar,
gnu/packages/bootstrap/armhf-linux/xz: New files.
* gnu-system.am (bootstrap_armhf_linuxdir, dist_bootstrap_armhf_linux_DATA)
(nodist_bootstrap_armhf_linux_DATA): New variables.
(DISTCLEANFILES): Add $(nodist_bootstrap_armhf_linux_DATA).
(gnu/packages/bootstrap/armhf-linux/guile-2.0.11.tar.xz): New target.
* build-aux/download.scm (file-name->uri): Use newer date in URI for
armhf-linux.
* gnu/packages/bootstrap.scm (raw-build): Use "guile-2.0.11.tar.xz" on
armhf-linux.
(glibc-dynamic-linker, %bootstrap-coreutils&co, %bootstrap-binutils)
(%bootstrap-glibc, %bootstrap-gcc): Add armhf-linux cases.
* m4/guix.m4 (GUIX_SYSTEM_TYPE): Add armhf case.
(GUIX_ASSERT_SUPPORTED_SYSTEM): Add armhf-linux to list of
supported systems.
* doc/guix.texi (GNU Distribution): Add armhf-linux to the list of
supported systems.
Fixes <http://bugs.gnu.org/19315>.
Reported by rekado <rekado@elephly.net>.
* doc/guix.texi (Invoking guix package): Adjust text to new guix-daemon
behavior introduced in commit 15ddeff.
Before that, as it was given an empty configuration file, nscd would
actually have all its caches disabled.
* gnu/services/base.scm (<nscd-configuration>, <nscd-cache>): New record
types.
(%nscd-default-caches, %nscd-default-configuration): New variables.
(nscd.conf-file): New procedure.
(nscd-service): Add 'config' parameter. Use 'nscd.conf-file', and
pass its result as the '-f' parameter of nscd.
* doc/guix.texi (Base Services): Update 'nscd-service' documentation
accordingly. Document 'nscd-configuration', 'nscd-cache',
'%nscd-default-configuration', and '%nscd-default-caches'.
Fixes <http://bugs.gnu.org/19316>.
Reported by rekado <rekado@elephly.net>.
* doc/guix.texi (Build Environment Setup): Show commands to set the
ownership and permissions of /gnu/store.
Appending to "raw" args broke optional parameters in 'guix package -I'
and 'guix package -A', and possibly other places. Therefore, switch to
parsing each set of options on its own and append resulting alists
together afterwards.
* guix/scripts/archive.scm (parse-options-from): Rename from
(parse-options) and add explicit argument. New form of (parse-options)
using its old algorithm via -from function.
* guix/scripts/build.scm: Ditto.
* guix/scripts/environment.scm: Ditto.
* guix/scripts/package.scm: Ditto.
* guix/scripts/system.scm: Ditto.
* tests/guix-package.sh: Add test.
* doc/guix.texi (Invoking guix build): Make it clear that the options
are parsed independently.
Co-authored-by: Ludovic Courtès <ludo@gnu.org>
* guix/build/glib-or-gtk-build-system.scm (wrap-all-programs): Add
#:glib-or-gtk-wrap-excluded-outputs parameter and honor it.
* guix/build-system/glib-or-gtk.scm (glib-or-gtk-build): Add
#:glib-or-gtk-wrap-excluded-outputs parameter and pass it in BUILDER.
* doc/guix.texi (Build Systems): Mention it.
This reverts commit 3b09332adf, which
turned out to be a bad idea because we need to have dependency
information between the device-mapping service and the file-system
service that uses it.
* gnu/system/file-systems.scm (<mapped-device>)[needed-for-boot?]: New
field.
* gnu/system.scm (operating-system-user-mapped-devices,
operating-system-boot-mapped-devices): Use it instead of trying to
guess. Guessing doesn't work when one refers to a partition using its
label, for instance.
* doc/guix.texi (Mapped Devices): Document 'needed-for-boot?'.
* gnu/system/locale.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/system.scm (<operating-system>)[locale]: Change the default to
"en_US.utf8".
(operating-system-locale-directory): New procecure.
(operating-system-derivation): Use it.
* doc/guix.texi (Using the Configuration System): Change example locale
to "fr_FR.utf8".
(operating-system Reference): Add xref to "Locales". Document
'locale-definitions'.
(Locales): New section.
* po/guix/POTFILES.in: Add gnu/system.scm.
Suggested by Adam Pribyl <pribyl@lowlevel.cz>.
* gnu/services/ssh.scm (lsh-service): Update docstring with xrefs to
the lsh manual. Fix typos.
* doc/guix.texi (Networking Services): Synchronize.
Reported by Adam Pribyl <pribyl@lowlevel.cz>.
* doc/guix.texi (Using the Configuration System): Use #:root-login?, not
#:allow-root-login?, in example.
(Networking Services): Fix module name for ssh.
Suggested by Alex Sassmannshausen <alex.sassmannshausen@gmail.com>.
* doc/guix.texi (Using the Configuration System): Remove 'password'
field in the example.
(User Accounts): Clarify use of the 'password' field, with links to
the libc and Guile manuals.
* gnu/build/activation.scm (activate-firmware): New procedure.
* gnu/system.scm (<operating-system>)[firmware]: New field.
(directory-union): New procedure.
(%base-firmware): New variable.
(operating-system-activation-script): Use 'directory-union', and call
'activate-firmware'.
* doc/guix.texi (operating-system Reference): Document 'firmware'.
* guix/gexp.scm (gexp->derivation): Add #:module-path parameter, and
pass it to 'imported-modules' and 'compiled-modules'.
* doc/guix.texi (G-Expressions): Adjust accordingly.
* gnu/system/vm.scm (system-qemu-image/shared-store-script): Add "$@" at
the end of the script.
(common-qemu-options): Remove trailing newline.
* doc/guix.texi (Invoking guix system): Document it.
* gnu/system/vm.scm (system-qemu-image/shared-store): Add
#:disk-image-size and #:full-boot? parameters and honor them. Pass
'#:copy-inputs? full-boot?', and change #:inputs argument.
* guix/scripts/system.scm (system-derivation-for-action): Pass
#:disk-image-size to 'system-qemu-image/shared-store'.
* doc/guix.texi (Invoking guix system): Mention use of '--image-size' in
conjunction with '--full-boot'.
* gnu/services/xorg.scm (xorg-start-command): Add #:drivers parameter.
Add 'device-section' procedure, and use it in 'xserver.conf'.
* doc/guix.texi (X Window): Document it.
Thanks to Mark H. Weaver <mhw@netris.org> for insightful discussions
and suggestions.
* guix/packages.scm (<package>)[graft]: New field.
(patch-and-repack): Invoke 'package-derivation' with #:graft? #f.
(package-source-derivation): Likewise. Do not use (%guile-for-build)
in call to 'patch-and-repack', and we could end up using a grafted
Guile.
(expand-input): Likewise, also for 'package-cross-derivation' call.
(package->bag): Add #:graft? parameter. Honor it. Use 'strip-append'
instead of 'package-full-name'.
(input-graft, input-cross-graft, bag-grafts, package-grafts): New
procedures.
(package-derivation, package-cross-derivation): Add #:graft? parameter
and honor it.
* gnu/packages/bootstrap.scm (package-with-bootstrap-guile): Add
recursive call on 'graft'.
* guix/build-system/gnu.scm (package-with-explicit-inputs,
package-with-extra-configure-variable, static-package): Likewise.
(gnu-build): Use the ungrafted Guile to avoid full rebuilds.
(gnu-cross-build): Likewise.
* guix/build-system/cmake.scm (cmake-build): Likewise.
* guix/build-system/glib-or-gtk.scm (glib-or-gtk-build): Likewise.
* guix/build-system/perl.scm (perl-build): Likewise.
* guix/build-system/python.scm (python-build): Likewise.
* guix/build-system/ruby.scm (ruby-build): Likewise.
* guix/build-system/trivial.scm (guile-for-build): Likewise.
* tests/packages.scm ("package-derivation, direct graft",
"package-cross-derivation, direct graft", "package-grafts,
indirect grafts", "package-grafts, indirect grafts, cross",
"package-grafts, indirect grafts, propagated inputs",
"package-derivation, indirect grafts"): New tests.
("bag->derivation", "bag->derivation, cross-compilation"): Wrap in
'parameterize'.
* doc/guix.texi (Security Updates): New node.
(Invoking guix build): Document --no-graft.
* emacs/guix-base.el (guix-switch-to-generation): New procedure.
* emacs/guix-info.el (guix-generation-info-insert-current): Insert button for
switching to generation.
* emacs/guix-list.el (guix-generation-list-switch): New procedure.
* doc/emacs.texi (emacs List buffer, emacs Info buffer): Document switching
generations.
* guix/scripts/package.scm (switch-to-generation): New procedure.
(switch-to-previous-generation): Use it.
(guix-package): Adjust for '--switch-generation' option.
* tests/guix-package.sh: Test it.
* doc/guix.texi (Invoking guix package): Document it.
* doc/guix.texi (Using the Configuration System): Add xref to
"operating-system Reference".
(operating-system Reference): New section.
(Networking Services): Add xref to it.
* doc/emacs.texi (emacs List buffer): Mention new key bindings.
* emacs/guix-base.el (guix-delete-generations): New procedure.
* emacs/guix-info.el (guix-generation-info-insert-number): Use it.
* emacs/guix-list.el (guix-generation-list-mark-delete,
guix-generation-list-execute): New procedures.
* emacs/guix-main.scm (delete-generations*): New procedure.
* guix/build-system.scm (<build-system>)[build, cross-build]: Remove.
[lower]: New field.
(<bag>): New record type.
(make-bag): New procedure.
* guix/packages.scm (bag-transitive-inputs, bag-transitive-build-inputs,
bag-transitive-host-inputs, bag-transitive-target-inputs,
package->bag): New procedures.
(package-derivation): Use it; use the bag, apply its build procedure,
etc.
(package-cross-derivation): Likewise.
* gnu/packages/bootstrap.scm (raw-build, make-raw-bag): New procedure.
(%bootstrap-guile): Use them.
* guix/build-system/trivial.scm (lower): New procedure.
(trivial-build, trivial-cross-build): Remove 'source' parameter. Pass
INPUTS as is.
(trivial-build-system): Adjust accordingly.
* guix/build-system/gnu.scm (%store, inputs-search-paths,
standard-search-paths, expand-inputs, standard-inputs): Remove.
(gnu-lower): New procedure.
(gnu-build): Remove 'source' and #:implicit-inputs? parameters.
Remove 'implicit-inputs' and 'implicit-search-paths' variables. Get
the source from INPUT-DRVS.
(gnu-cross-build): Likewise.
(standard-cross-packages): Remove call to 'standard-packages'.
(standard-cross-inputs, standard-cross-search-paths): Remove.
(gnu-build-system): Remove 'build' and 'cross-build'; add 'lower'.
* guix/build-system/cmake.scm (lower): New procedure.
(cmake-build): Remove 'source' and #:cmake parameters. Use INPUTS and
SEARCH-PATHS as is. Get the source from INPUTS.
* guix/build-system/perl.scm: Likewise.
* guix/build-system/python.scm: Likewise.
* guix/build-system/ruby.scm: Likewise.
* gnu/packages/cross-base.scm (cross-gcc): Change "cross-linux-headers"
to "linux-headers".
(cross-libc)[xlinux-headers]: Pass #:implicit-cross-inputs? #f.
Likewise. In 'propagated-inputs', change "cross-linux-headers" to
"linux-headers".
* guix/git-download.scm (git-fetch): Use 'standard-packages' instead of
'standard-inputs'.
* tests/builders.scm ("gnu-build-system"): Remove use of
'build-system-builder'.
("gnu-build"): Remove 'source' and #:implicit-inputs? arguments to
'gnu-build'.
* tests/packages.scm ("search paths"): Adjust to new build system API.
("package-cross-derivation, no cross builder"): Likewise.
* doc/guix.texi (Build Systems): Add paragraph on bags.
* guix/build-system/cmake.scm (cmake-build): Add #:build-type. Pass it
in BUILDER.
* guix/build/cmake-build-system.scm (configure): Add #:build-type
parameter and honor it.
* doc/guix.texi (Build Systems): Document #:configure-flags and
#:build-type for CMake.
* guix/ui.scm (size->number): Add a bunch of large units. Recognize
one-letter unit names. Change "KB" to "kB".
* tests/ui.scm ("size->number, 1T"): New test.
* doc/guix.texi (Invoking guix gc): Add cross-reference to "Block size"
in the Coreutils manual.
(Invoking guix system): Likewise.
This fixes regressions introduced in de1c158 ("system: Add support for
boot-time mapped devices.").
* doc/guix.texi (Initial RAM Disk): Adjust example with custom use of
'base-initrd'. Document #:mapped-devices parameter of 'base-initrd'.
* gnu/system/vm.scm (system-disk-image, system-qemu-image,
virtualized-operating-system): Adjust call to 'base-initrd' to new
signature.
* gnu/system/linux-initrd.scm (expression->initrd): Remove #:linux and
#:linux-modules parameters. Remove call to
'float-linux-module-directory'.
(base-initrd): Add call to 'float-linux-module-directory'. Use it in
#:linux-modules argument in the gexp. Remove #:linux and
#:linux-modules arguments to 'expression->initrd'.
* gnu/build/linux-initrd.scm (build-initrd): Remove
#:linux-module-directory parameter. Don't create 'modules'
sub-directory.
* gnu/build/linux-boot.scm (boot-system): Mentin that LINUX-MODULES is a
list of absolute file names. Don't prepend "/modules/" to
LINUX-MODULES.
* doc/guix.texi (Initial RAM Disk): Adjust accordingly.
Use "U" to upgrade the current package, "^" to upgrade all.
* emacs/guix-list.el: (guix-list-unmark): With prefix, mark all.
(guix-package-list-mark-outputs): New procedure.
(guix-package-list-mark-install, guix-package-list-mark-delete)
(guix-package-list-mark-upgrade): Use it.
(guix-package-list-mark-upgrades): New command.
* doc/emacs.texi (emacs List buffer): Update the manual accordingly.
* guix/gexp.scm (lower-reference-graphs): New procedure.
(gexp->derivation)[graphs-file-names]: New procedure.
Use 'lower-reference-graphs', and augment #:inputs argument as a
function of #:references-graphs.
* doc/guix.texi (G-Expressions): Adjust 'gexp->derivation' documentation
accordingly.
* tests/gexp.scm ("gexp->derivation, store copy"): Remove reference to
TWO in BUILD-DRV. Use TWO directly in #:references-graphs argument.
("gexp->derivation #:references-graphs"): New test.
* gnu/system/vm.scm (qemu-image): Remove variable 'graph'; use INPUTS as
the #:references-graphs argument to
'expression->derivation-in-linux-vm'.
* configure.ac (emacsuidir): New variable.
(AC_CONFIG_FILES): Add 'emacs/guix-init.el', 'emacs/guix-helper.scm'.
* Makefile.am: Include 'emacs.am'.
* emacs.am: New file.
* doc/emacs.texi: New file.
* doc/guix.texi: Include 'emacs.texi'.
* emacs/guix-backend.el: New file.
* emacs/guix-base.el: New file.
* emacs/guix-helper.scm.in: New file.
* emacs/guix-history.el: New file.
* emacs/guix-info.el: New file.
* emacs/guix-init.el.in: New file.
* emacs/guix-list.el: New file.
* emacs/guix-main.scm: New file.
* emacs/guix-utils.el: New file.
* emacs/guix.el: New file.
* guix/gexp.scm (<gexp>)[natives]: New field.
(write-gexp): Use both 'gexp-references' and
'gexp-native-references'.
(gexp->derivation): Use both 'gexp-inputs' and 'gexp-native-inputs',
and append them.
(gexp-inputs): Add 'references' parameter and honor it.
(gexp-native-inputs): New procedure.
(gexp->sexp)[reference->sexp]: Add 'native?' parameter and honor it.
Use it, and use 'gexp-native-references'.
(gexp)[collect-native-escapes]: New procedure.
[escape->ref]: Handle 'ungexp-native' and 'ungexp-native-splicing'.
[substitute-ungexp, substitute-ungexp-splicing]: New procedures.
[substitute-references]: Use them, and handle 'ungexp-native' and
'ungexp-native-splicing'.
Adjust generated 'make-gexp' call to provide both normal references
and native references.
[read-ungexp]: Support 'ungexp-native' and
'ungexp-native-splicing'.
Add reader extension for #+.
* tests/gexp.scm (gexp-native-inputs): New procedure.
(gexp->sexp*): Add 'target' parameter.
("ungexp + ungexp-native",
"input list + ungexp-native",
"input list splicing + ungexp-native-splicing",
"gexp->derivation, ungexp-native",
"gexp->derivation, ungexp + ungexp-native"): New tests.
("sugar"): Add tests for #+ and #+@.
* doc/guix.texi (G-Expressions): Document 'ungexp-native' et al.
* guix/gexp.scm (lower-inputs): Add #:system and #:target. Use
'package->cross-derivation' when TARGET is true. Honor SYSTEM.
(gexp->derivation): Add #:target argument. Pass SYSTEM and TARGET to
'lower-inputs' and 'gexp->sexp'.
(gexp->sexp): Add #:system and #:target. Pass them in recursive call
and to 'package-file'.
* tests/gexp.scm (gexp->sexp*): Add 'system' and 'target' parameters.
("gexp->derivation, cross-compilation"): New test.
* guix/monads.scm (package-file): Add #:target keyword parameter and
honor it.
(package->cross-derivation): New procedure.
* tests/monads.scm ("package-file + package->cross-derivation"): New test.
* doc/guix.texi (The Store Monad): Update 'package-file' documentation.
Add 'package->cross-derivation'.
Suggested by Mark H. Weaver.
* gnu/system/shadow.scm (<user-group>)[system?]: New field.
(%base-groups): Introduce 'system-group' macro, and use it.
* gnu/system.scm (user-group->gexp): Pass the 'system?' field.
* guix/build/activation.scm (add-group): Add #:system? and honor it.
(activate-users+groups): Handle the 'system?' field.
* gnu/system/file-systems.scm (%tty-gid): Choose an ID below 1000.
* doc/guix.texi (User Accounts): Document the 'system?' field.
Ludovic Courtès