* guix/scripts/package.scm (show-help): Add help text for --install-from-file
option.
(%options): Add --install-from-file option.
* tests/guix-package.sh: Test it.
* doc/guix.texi ("invoking guix package"): Document it.
* doc/package-hello.scm: New file.
* doc.am (EXTRA_DIST): Add it.
Fixes <http://bugs.gnu.org/21111>.
Reported by Dave Love <fx@gnu.org>.
* doc/guix.texi (Binary Installation): Add paragraph about "implausibly old
time stamps" warning from tar.
* gnu/system.scm (<operating-system>)[kernel-arguments]: New field.
(operating-system-grub.cfg): Honor it.
(operating-system-parameters-file): Add 'kernel-arguments' to the parameters
file.
* guix/scripts/system.scm (previous-grub-entries)[system->grub-entry]: Read
the 'kernel-arguments' field of the parameters file, when available.
* gnu/system/vm.scm (system-qemu-image/shared-store-script):
Use (operating-system-kernel-arguments os) in '-append'.
* doc/guix.texi (operating-system Reference): Document it.
Fixes <http://bugs.gnu.org/19778>.
Reported by Mark H Weaver <mhw@netris.org>.
* gnu/system/file-systems.scm (%uuid-rx): New variable.
(string->uuid): New procedure.
(uuid): New macro.
* tests/file-systems.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
* doc/guix.texi (File Systems): Give an example of UUID.
* gnu/packages/gcc.scm (gcc-configure-flags-for-triplet): On armhf,
include --with-fpu=neon.
* doc/guix.texi (GNU Distribution): Document that our armhf port
requires NEON.
* doc/guix.texi (Daemon Offload Setup): Mention that we're using lsh. Mention
GUILE_LOAD_PATH settings on the target machine. Explain that machines must
authorize each other.
* guix/scripts/environment.scm (package+propagated-inputs): Add 'output'
parameter. Use it in return value.
(options/resolve-packages): Use 'append-map' instead of 'map'. For 'load'
and 'expression', return all the outputs of the resulting package. For
'package', use 'specification->package+output' instead of
'specification->package'.
(guix-environment): Adjust uses of PACKAGES accordingly.
* doc/guix.texi (Invoking guix environment): Document it.
* tests/guix-environment.sh: Add test for --ad-hoc guile-bootstrap:out.
* doc/environment-gdb.scm: New file.
* doc.am (EXTRA_DIST): Add it.
* doc/guix.texi (Invoking guix environment): Clarify wording of the first
example. Add a --ad-hoc example upfront. Add an example for '-e', and one
for '-l'.
* emacs/guix-base.el (guix-define-buffer-type): Move common key bindings
from here...
(guix-root-map): ... to here. New variable.
* emacs/guix-info.el (guix-info-mode-map): Use it.
* emacs/guix-list.el (guix-list-mode-map): Use it.
* doc/emacs.texi (Emacs Keymaps): Document it.
* guix/scripts/size.scm: New file.
* Makefile.am (MODULES): Add it.
(SCM_TESTS): Add tests/size.scm.
* doc.am (SUBCOMMANDS): Add 'size'.
* po/guix/POTFILES.in: Add guix/scripts/size.scm.
* tests/size.scm: New file.
* doc/guix.texi (Packages with Multiple Outputs): Add xref to "Invoking guix
size".
(Invoking guix size): New node.
(Invoking guix gc): Add index for "closure" and xref to the above.
* doc/contributing.texi (Submitting Patches): Use @enumerate for the check
list. Add item about 'guix size'.
* HACKING (Contributing): New section.
(Building from Git, The Perfect Setup, Coding Style, Submitting Patches):
Move to ...
* doc/guix.texi (Running Guix Before It Is Installed): Likewise.
* doc/contributing.texi: ... here. New file.
* doc.am (EXTRA_DIST): Use it.
* README (Installation): Adapt to it.
* configure.ac (DOT): Likewise.
* guix/scripts/build.scm (package-with-source)[tarball-base-name]: Gracefully
handle file names that lack an extension.
Pass #:recursive? #t to 'download-to-store'.
* guix/download.scm (download-to-store): Add #:recursive? parameter and pass
it to 'add-to-store'.
* doc/guix.texi (Invoking guix build): Add an example of --with-source with a
directory.
* guix/import/cabal.scm: New file.
* guix/import/hackage.scm: Update to use the new Cabal parsing module.
* tests/hackage.scm: Update tests.
* guix/scripts/import/hackage.scm: Add new '--cabal-environment' and '--stdin'
options.
* doc/guix.texi: ... and document them.
* Makefile.am (MODULES): Add 'guix/import/cabal.scm',
'guix/import/hackage.scm' and 'guix/scripts/import/hackage.scm'.
(SCM_TESTS): Add 'tests/hackage.scm'.
Suggested by Thomas Schwinge <thomas@codesourcery.com>.
* gnu/system/install.scm (self-contained-tarball): Remove
"/root/.guix-profile" from the 'tar' arguments.
* doc/guix.texi (Binary Installation): Add a step to create
~root/.guix-profile.
Suggested by Federico Beffa <beffa@fbengineering.ch>.
* guix/monads.scm (bind-syntax): New macro.
(with-monad): Use it instead of 'identifier-syntax'.
* tests/monads.scm (">>= with more than two arguments"): New test.
* doc/guix.texi (The Store Monad): Explain that there can be several MPROC.
Add an example.
Reported by ngz on #guix.
* doc/emacs.texi (Emacs Initial Setup): Describe how to configure
"guix.el" in the case of binary installation and when Guix is not
installed.
Suggested by Ludovic Courtès <ludo@gnu.org>.
* emacs/guix-pcomplete.el: New file.
* emacs.am (ELFILES): Add it.
* doc/emacs.texi (Emacs Completions): New node.
Partly fixes <http://bugs.gnu.org/20720>.
Reported by Alex Kost <alezost@gmail.com>.
* gnu/system.scm (default-/etc/hosts): Change 'text-file' to 'plain-file'.
(maybe-file->monadic): New procedure.
(operating-system-etc-directory): Use it.
* doc/guix.texi (operating-system Reference, Networking Services): Adjust
accordingly.
Partly fixes <http://bugs.gnu.org/20720>
Reported by Alex Kost <alezost@gmail.com>.
* gnu/system.scm (etc-directory): Change default #:sudoers value to a
'plain-file'. Don't bind it. Remove #~#$.
(maybe-string->file): New procedure.
(operating-system-etc-directory): Use it.
(%sudoers-specification): Use 'plain-file'.
* doc/guix.texi (operating-system Reference): Adjust accordingly.
* emacs/guix-list.el: Split 'guix-list-mark' into internal and
interactive functions. Remove "M" key binding, use "C-u m" instead.
(guix-list--mark): New function. Use it in other marking functions.
(guix-list-mark): Mark all lines with a prefix argument.
* doc/emacs.texi (Emacs List buffer): Document changes in the key
bindings.
* guix/scripts/environment.scm (%options): Add "ad-hoc" option.
(show-help): Display help for "--ad-hoc".
(packages+propagated-inputs): New procedure.
(guix-environment): Create ad hoc environment when asked.
* doc/guix.texi ("invoking guix environment"): Document it.
* guix/ui.scm (load*): Add #:on-error parameter.
[tag, error-string]: New variables.
Wrap 'load' call in 'call-with-prompt'. Pass TAG to 'make-stack'. Honor
ON-ERROR after 'report-load-error' call.
(report-load-error): Change to not exit on error. Make private.
* guix/scripts/system.scm (show-help, %options): Add --on-error.
(guix-system): Use 'load*' and pass it #:on-error.
* gnu/system/shadow.scm (%base-user-accounts): New variable.
* gnu/system.scm (<operating-system>)[users]: Use it as the default value.
* gnu/system/examples/bare-bones.tmpl (users): Use it.
* gnu/system/examples/desktop.tmpl (users): Likewise.
* doc/guix.texi (operating-system Reference, User Accounts): Adjust
accordingly.
* doc/guix.texi (Invoking guix package): Mention the declarative approach and
--manifest in the intro. And an anchor for --manifest. Explain why/how it
can be used. Tweak wording.
* gnu/services/xorg.scm (xorg-configuration-file): New procedure, with code
formerly in 'xorg-start-command'.
(xorg-start-command): Remove #:drivers and #:resolutions; add
#:configuration-file; use it as well as 'xorg-configuration-file'.
* guix/scripts/package.scm (search-path-environment-variables): Add #:kind
parameter. Pass it to 'environment-variable-definition'.
(display-search-paths): Add #:kind parameter and pass it to
'search-path-environment-variables'.
(%options): Add an optional parameter for "--search-paths".
(guix-package)[process-query]: Handle it.
* tests/guix-package-net.sh: Adjust existing test.
* tests/guix-package.sh: Adjust existing tests and add new test.
* doc/guix.texi (Invoking guix package): Document it.
Fixes a thinko introduced in 175ced4.
* gnu/system/install.scm (self-contained-tarball): Use "root:0" as the
owner and group.
* doc/guix.texi (Binary Installation): Revert 175ced4.
Suggested by Andreas Enge <andreas@enge.fr>
at <http://lists.gnu.org/archive/html/guix-devel/2015-05/msg00220.html>.
* gnu/system/install.scm (self-contained-tarball): Pass --owner and
--group to 'tar'.
* doc/guix.texi (Binary Installation): Move group and account creation
before extraction. Make "run the daemon" a separate step.
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.
David Thompson