Age | Commit message (Expand) | Author |
2016-03-10 | substitute: Optimize HTTP pipelining over TLS....* guix/scripts/substitute.scm (http-multiple-get): Write the requests
to a bytevector output port before sending them.
| Ludovic Courtès |
2016-03-10 | substitute: Add HTTPS support....Fixes <http://bugs.gnu.org/22937>.
Reported by Chris Marusich <cmmarusich@gmail.com>.
* guix/scripts/substitute.scm (fetch): Add 'https' alongside 'http'.
Use 'open-connection-for-uri' instead of 'open-socket-for-uri'. Call
'setvbuf' only when PORT matches 'file-port?'.
(http-multiple-get): Likewise. Change 'base-url' parameter to
'base-uri'.
(fetch-narinfos)[do-fetch]: Add 'https' case alongside 'http'. Pass URI
instead of URL to 'http-multiple-get'.
* doc/guix.texi (Requirements): Move GnuTLS one level higher and mention
HTTPS substitutes.
(Substitutes): Mention HTTPS and recommend it. Explain why servers
are not authenticated. Add "On Trusting Binaries" subsection.
| Ludovic Courtès |
2016-03-09 | substitute: Error out on unsupported URL schemes....Reported in <http://bugs.gnu.org/22937>
by Chris Marusich <cmmarusich@gmail.com>.
* guix/scripts/substitute.scm (fetch): Add 'else' case and call 'leave'.
| Ludovic Courtès |
2016-03-08 | guix build: Add '--quiet'....Fixes <http://bugs.gnu.org/19772>.
Reported by Andrei Osipov <andrspv@gmail.com>.
* guix/scripts/build.scm (show-help, %options): Add --quiet.
(guix-build): Parameterize 'current-build-output-port' accordingly.
* doc/guix.texi (Invoking guix build): Use it in example.
(Additional Build Options): Document it.
| Ludovic Courtès |
2016-03-08 | guix system: Write the GC root on the target file system....Fixes <http://bugs.gnu.org/22802>.
Reported by Jookia <166291@gmail.com>.
* guix/scripts/system.scm (install-grub*): Prepend TARGET to GC-ROOT.
| Ludovic Courtès |
2016-03-05 | guix build: Set the build options early....This fixes a bug whereby, with grafts leading to builds very early,
build options such as --substitute-urls would not be taken into account
yet.
Reported by Andreas Enge <andreas@enge.fr>.
* guix/scripts/build.scm (guix-build): Move 'opts' to the beginning.
Use 'with-store' instead of 'open-connection'. Call
'set-build-options-from-command-line' right after 'with-store'.
| Ludovic Courtès |
2016-03-04 | lint: cve: Gracefully handle HTTP errors....* guix/scripts/lint.scm (current-vulnerabilities*): New procedure.
(package-vulnerabilities): Use it.
| Ludovic Courtès |
2016-03-03 | lint: derivation: Disable grafts, but check replacements....* guix/scripts/lint.scm (check-derivation): Pass #:graft? #f. When
'package-replacement' exists, compute its derivation.
| Ludovic Courtès |
2016-03-03 | guix build: -S returns the replacement's source....Reported by Mark H Weaver.
* guix/scripts/build.scm (options->derivations): When SRC and GRAFT? are
true, use the source of P's replacement.
* tests/guix-build.sh: Add test.
| Ludovic Courtès |
2016-03-02 | utils: Use '@' for separating package names and version numbers....This provides the ability to use numbers in package names.
Fixes <http://bugs.gnu.org/19219>.
* guix/utils.scm (package-name->name+version): New procedure.
* gnu/packages.scm (%find-package): Add a FALLBACK? keyword argument.
Use the previous method when no package is found.
(specification->package+output, specification->package): Adapt
documentation to new syntax.
* doc/guix.texi (Invoking guix package, Invoking guix import): Likewise.
* guix/ui.scm (package-specification->name+version+output): Likewise.
* guix/scripts/import/hackage.scm (show-help): Likewise.
* tests/guix-build.sh: Adapt to new syntax.
* tests/guix-lint.sh: Likewise.
* tests/guix-package.sh: Likewise.
* tests/ui.scm ("package-specification->name+version+output"): Likewise.
* tests/utils.scm ("package-name->name+version"): Likewise.
* NEWS: Mention new syntax.
| Mathieu Lirzin |
2016-03-02 | graph: Ignore 'GUIX_BUILD_OPTIONS'....Previously 'GUIX_BUILD_OPTIONS' would be honored, but 'guix graph' does
not support the common build options.
* guix/scripts/graph.scm (guix-graph): Use 'args-fold*' instead of
'parse-command-line'.
| Ludovic Courtès |
2016-03-02 | guix build: Move '--no-grafts' to the common build options....* guix/scripts/build.scm (%options): Move --no-grafts to...
(%standard-build-options): ... here.
(show-help, show-build-options-help): Adjust accordingly.
* guix/scripts/archive.scm (%default-options): Add 'graft?'.
(guix-archive): Parametrize '%graft?'.
* guix/scripts/environment.scm (%default-options): Add 'graft?'.
(guix-environment): Parametrize '%graft?'.
* guix/scripts/package.scm (%default-options): Add 'graft?'.
(guix-package): Parametrize '%graft?'.
* guix/scripts/system.scm (%default-options): Add 'graft?'.
(guix-system): Parametrize 'graft?'.
* doc/guix.texi (Additional Build Options): Move --no-grafts to...
(Common Build Options): ... here.
| Ludovic Courtès |
2016-03-02 | guix archive: Use 'with-store'....* guix/scripts/archive.scm (guix-archive): Use 'with-store' instead of
an explicit 'open-connection'.
| Ludovic Courtès |
2016-03-01 | grafts: Graft recursively....Fixes <http://bugs.gnu.org/22139>.
* guix/grafts.scm (graft-derivation): Rename to...
(graft-derivation/shallow): ... this.
(graft-origin-file-name, item->deriver, non-self-references)
(cumulative-grafts, graft-derivation): New procedures
* tests/grafts.scm ("graft-derivation, grafted item is a direct
dependency"): Clarify title. Use 'grafted' instead of 'graft' to refer
to the grafted derivation.
("graft-derivation, grafted item is an indirect dependency")
("graft-derivation, no dependencies on grafted output"): New tests.
* guix/packages.scm (input-graft): Change to take a package instead of
an input.
(input-cross-graft): Likewise.
(fold-bag-dependencies): New procedure.
(bag-grafts): Rewrite in terms of 'fold-bag-dependencies'.
* tests/packages.scm ("package-derivation, indirect grafts"): Comment out.
* doc/guix.texi (Security Updates): Mention run-time dependencies and
recursive grafting.
| Ludovic Courtès |
2016-02-26 | import: Add github-updater....* guix/import/github.scm: New file.
* guix/scripts/refresh.scm (%updaters): Add %GITHUB-UPDATER.
* doc/guix.texi (Invoking guix refresh): Mention it.
* Makefile.am (MODULES): Add gnu/import/github.scm.
| Ben Woodcroft |
2016-02-26 | store: 'path-info-deriver' is #f when there is no deriver....* guix/store.scm (read-path-info): Use #f when we get the empty string
for DERIVER.
* guix/scripts/publish.scm (narinfo-string): Adjust accordingly.
* tests/store.scm ("path-info-deriver"): New test.
| Ludovic Courtès |
2016-02-25 | Merge branch 'media-updates' | Mark H Weaver |
2016-02-25 | guix system: Restore load path after running the activation script....Fixes <http://bugs.gnu.org/22753>.
Reported by Mark H Weaver <mhw@netris.org>.
* guix/scripts/system.scm (save-load-path-excursion): New variable.
(upgrade-shepherd-services): Add comment about the issue.
(switch-to-system): Use 'save-load-path-excursion' around
'primitive-load' call.
| Ludovic Courtès |
2016-02-25 | publish: Do not publish nars for invalid store items....Before that, /nar requests could succeed if the requested store item
exists but is invalid (although such requests were unlikely because the
corresponding narinfo request would have failed.)
* guix/scripts/publish.scm (render-nar): Add 'store' parameter. Use
'valid-path?' instead of 'file-exists?'.
(make-request-handler): Adjust 'render-nar' call accordingly.
* tests/publish.scm ("/nar/invalid"): New test.
| Ludovic Courtès |
2016-02-24 | gnu-maintenance: Add X.org updater....* guix/gnu-maintenance.scm (xorg-package?, latest-xorg-release): New
private functions.
(%xorg-updater): New public variable.
* guix/scripts/refresh.scm (%updaters): Add %xorg-updater.
* doc/guix.texi (Invoking guix refresh): Mention the new updater.
| Andy Wingo |
2016-02-24 | Do not check package freshness during upgrade....Fixes <http://bugs.gnu.org/22740>.
Reported by Andreas Enge <andreas@enge.fr>.
* gnu/packages.scm (waiting, ftp-open*, check-package-freshness): Remove.
* guix/scripts/package.scm (options->installable): Adjust accordingly.
* emacs/guix-main.scm (package->manifest-entry*): Likewise.
| Alex Kost |
2016-02-24 | publish: Move 'query-path-info' call where it belongs....* guix/scripts/publish.scm (narinfo-string): Remove 'path-info'
parameter and add 'store' parameter. Call 'query-path-info'.
(render-narinfo): Adjust accordingly.
| Ludovic Courtès |
2016-02-23 | refresh: Remove unneeded import....Reported by Leo Famulari <leo@famulari.name>
and Ben Woodcroft <b.woodcroft@uq.edu.au>
at <http://bugs.gnu.org/22752>.
* guix/scripts/refresh.scm: Remove unneeded and harmful import of (guix
import gem).
| Ludovic Courtès |
2016-02-22 | derivations: Move grafts to (guix grafts)....* guix/derivations.scm (<graft>, graft-derivation, %graft?)
(set-grafting): Move to...
* guix/grafts.scm: ... here. New file.
* guix/gexp.scm, guix/packages.scm, tests/packages.scm,
guix/scripts/build.scm: Use it.
* Makefile.am (MODULES): Add it.
(SCM_TESTS): Add tests/grafts.scm.
* tests/derivations.scm ("graft-derivation"): Move to...
* tests/grafts.scm: ... here. New file.
| Ludovic Courtès |
2016-02-20 | import: gem: Add updater....* guix/import/gem.scm (guix-package->gem-name,
gem-package?, latest-release): New procedures.
(%gem-updater): New variable.
(rubygems-fetch): Wrap body in
'call-with-output-file' and 'with-error-to-port'.
* guix/scripts/refresh.scm (%updaters): Add %GEM-UPDATER.
* doc/guix.texi (Invoking guix refresh): Mention RubyGems.
| Ben Woodcroft |
2016-02-12 | scripts: environment: Build environments as profiles....Fixes <http://bugs.gnu.org/19816>.
* guix/scripts/environment.scm (evaluate-input-search-paths)
(build-inputs): Delete.
(evaluate-profile-search-paths, strip-input-name)
(package-or-package+output?, package-environment-inputs)
(build-environment, inputs->profile-derivations): New procedures.
(create-environment, show-search-paths, launch-environment)
(launch-environment/container): Replace 'inputs' argument
with 'profile' argument.
(package+propagated-inputs): Strip off names off of input tuples.
(options/resolve-packages): Handle input tuples that specify an output
in expressions.
(guix-environment): Convert inputs into a profile to use in the
environment. Remove non-package inputs such as origins from
environment inputs.
* doc/guix.texi ("invoking guix environment"): Document package+output
tuples for --expression option.
* tests/guix-environment.sh: Update tests.
* tests/guix-environment-container.sh: Likewise.
Co-authored-by: Ludovic Courtès <ludo@gnu.org>
| David Thompson |
2016-02-05 | guix system: Simply warn if we cannot talk to the shepherd....Before that 'open-connection' would return #f, and thus
'current-services' would return a single #f value when its continuation
expects two.
Reported by calher on #guix.
* gnu/services/herd.scm (open-connection): Rethrow system-error
exceptions.
(with-shepherd): Expect CONNECTION to always be true; remove useless
'dynamic-wind'.
* guix/scripts/system.scm (warn-on-system-error): New macro.
(upgrade-shepherd-services): Wrap body in 'warn-on-system-error'.
| Ludovic Courtès |
2016-02-03 | guix system: 'reconfigure' loads and starts new services....Partly fixes <http://bugs.gnu.org/22039>.
* gnu/services/herd.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/services/shepherd.scm (shepherd-service-canonical-name): New
procedure.
(shepherd-service-file): Export.
* guix/scripts/system.scm (upgrade-shepherd-services): New procedure.
(switch-to-system): Use it.
* guix/ui.scm (info): New procedure.
* doc/guix.texi (Invoking guix system): Mention system services.
| Ludovic Courtès |
2016-02-01 | guix build: Add '--with-input'....* guix/scripts/build.scm (transform-package-inputs): New procedure.
(%transformations): Add it.
(%transformation-options, show-transformation-options-help): Add
--with-input.
* tests/scripts-build.scm ("options->transformation, with-input"):
("options->transformation, with-input, no matches"): New tests.
* tests/guix-build.sh: Add tests.
* doc/guix.texi (Package Transformation Options): Document it.
| Ludovic Courtès |
2016-02-01 | guix package: Support package transformation options....* guix/scripts/package.scm (show-help): Call
'show-transformation-options-help'.
(%options): Append %TRANSFORMATION-OPTIONS.
(process-actions)[transform, transform-entry]: New procedures.
* doc/guix.texi (Invoking guix package): Mention package
transformations.
(Package Transformation Options): Mention 'guix package'.
| Ludovic Courtès |
2016-02-01 | guix build: Separate transformation options....* guix/scripts/build.scm (%transformation-options): New variable.
(show-transformation-options-help): New procedure.
(show-help): Remove '--with-source' documentation and add
'show-transformation-options-help' call.
(%options): Remove "with-source" and append %TRANSFORMATION-OPTIONS.
* doc/guix.texi (Package Transformation Options): New node. Document
'--with-source', moved from...
(Additional Build Options): ... here.
| Ludovic Courtès |
2016-02-01 | guix build: Transformations operate on single objects....* guix/scripts/build.scm (transform-package-source): Return a procedure
that expects a single object rather than a list of packages.
(options->transformation): Rewrite to precompute the list of applicable
transformations and to return a procedure that expects a single object
rather than a list of objects.
(options->derivations): Adjust accordingly.
* tests/scripts-build.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
| Ludovic Courtès |
2016-01-29 | guix system: Rename 'dmd-graph' to 'shepherd-graph'....* doc/images/dmd-graph.dot: Rename to...
* doc/images/shepherd-graph.dot: ... this.
* doc.am (DOT_FILES): Adjust accordingly.
* guix/scripts/system.scm (dmd-service-node-label)
(dmd-service-node-type, export-dmd-graph): Rename to...
(shepherd-service-node-label, shepherd-service-node-type)
(export-shepherd-graph): ... this.
(show-help, process-action, process-command): Rename 'dmd-graph' to
'shepherd-graph'.
* emacs/guix-command.el (guix-command-additional-execute-arguments)
(guix-command-special-executors): Likewise.
* doc/guix.texi: Likewise.
* doc/emacs.texi (Emacs Popup Interface): Likewise.
| Alex Kost |
2016-01-29 | services: Rename 'dmd' services to 'shepherd'....* gnu/services/shepherd.scm (dmd-root-service-type, %dmd-root-service)
(dmd-service-type, <dmd-service>, dmd-service, dmd-service?)
(make-dmd-service, dmd-service-documentation, dmd-service-provision)
(dmd-service-requirement, dmd-service-respawn, dmd-service-start)
(dmd-service-stop, dmd-service-auto-start?, dmd-service-modules)
(dmd-service-imported-modules, dmd-service-file-name, dmd-service-file)
(dmd-service-back-edges): Rename to...
(shepherd-root-service-type, %shepherd-root-service, shepherd-service-type)
(<shepherd-service>, shepherd-service, shepherd-service?)
(make-shepherd-service, shepherd-service-documentation)
(shepherd-service-provision, shepherd-service-requirement)
(shepherd-service-respawn, shepherd-service-start)
(shepherd-service-stop, shepherd-service-auto-start?)
(shepherd-service-modules, shepherd-service-imported-modules)
(shepherd-service-file-name, shepherd-service-file)
(shepherd-service-back-edges): ...this
* gnu/services.scm: Adjust comments.
* gnu/services/avahi.scm (avahi-dmd-service): Rename to...
(avahi-shepherd-service): ... this.
* gnu/services/base.scm (%root-file-system-dmd-service)
(file-system->dmd-service-name, mapped-device->dmd-service-name)
(dependency->dmd-service-name, file-system-dmd-service)
(mingetty-dmd-service, nscd-dmd-service, guix-dmd-service)
(guix-publish-dmd-service, udev-dmd-service, gpm-dmd-service): Rename to...
(%root-file-system-shepherd-service)
(file-system->shepherd-service-name, mapped-device->shepherd-service-name)
(dependency->shepherd-service-name, file-system-shepherd-service)
(mingetty-shepherd-service, nscd-shepherd-service, guix-shepherd-service)
(guix-publish-shepherd-service, udev-shepherd-service)
(gpm-shepherd-service): ... this.
* gnu/services/databases.scm (postgresql-dmd-service): Rename to...
(postgresql-shepherd-service): ... this.
* gnu/services/desktop.scm (upower-dmd-service, elogind-dmd-service):
Rename to...
(upower-shepherd-service, elogind-shepherd-service): ... this.
* gnu/services/dbus.scm (dbus-dmd-service): Rename to...
(dbus-shepherd-service): ... this.
* gnu/services/lirc.scm (lirc-dmd-service): Rename to...
(lirc-shepherd-service): ... this.
* gnu/services/mail.scm (dovecot-dmd-service): Rename to...
(dovecot-shepherd-service): ... this.
* gnu/services/networking.scm (ntp-dmd-service, tor-dmd-service)
(bitlbee-dmd-service, wicd-dmd-service, network-manager-dmd-service): Rename to...
(dbus-shepherd-service): ... this.
* gnu/services/ssh.scm (lsh-dmd-service): Rename to...
(lsh-shepherd-service): ... this.
* gnu/services/web.scm (nginx-dmd-service): Rename to...
(nginx-shepherd-service): ... this.
* gnu/services/xorg.scm (slim-dmd-service): Rename to...
(slim-shepherd-service): ... this.
* gnu/system.scm (essential-services): Use '%shepherd-root-service'.
* gnu/system/install.scm (cow-store-service-type): Adjust accordingly.
* guix/scripts/system.scm (dmd-service-node-label, dmd-service-node-type)
(export-dmd-graph): Likewise.
* tests/guix-system.sh: Likewise.
* tests/services.scm ("dmd-service-back-edges"): Rename to...
("shepherd-service-back-edges"): Adjust accordingly.
* doc/guix.texi: Likewise.
* doc/images/service-graph.dot: Use 'shepherd' service name.
| Alex Kost |
2016-01-29 | Rename (gnu services dmd) to (gnu services shepherd)....* gnu/services/dmd.scm: Rename to...
* gnu/services/shepherd.scm: ... this.
* gnu/system.scm: Use it.
* gnu/system/install.scm: Likewise.
* gnu/services/xorg.scm: Likewise.
* gnu/services/web.scm: Likewise.
* gnu/services/ssh.scm: Likewise.
* gnu/services/networking.scm: Likewise.
* gnu/services/mail.scm: Likewise.
* gnu/services/lirc.scm: Likewise.
* gnu/services/desktop.scm: Likewise.
* gnu/services/dbus.scm: Likewise.
* gnu/services/databases.scm: Likewise.
* gnu/services/base.scm: Likewise.
* gnu/services/avahi.scm: Likewise.
* guix/scripts/system.scm: Likewise.
* tests/services.scm: Likewise.
* tests/guix-system.sh: Likewise.
* doc/guix.texi (Shepherd Services): Adjust accordingly.
* gnu-system.am (GNU_SYSTEM_MODULES): Likewise.
* po/guix/POTFILES.in: Likewise.
| Alex Kost |
2016-01-28 | lint: Rewrite 'check-patch-file-names'....* guix/scripts/lint.scm (check-patch-file-names): Improve clarity by
reversing the logic.
| Mathieu Lirzin |
2016-01-28 | lint: Remove an unneeded clause in 'check-patch-file-names'....* guix/scripts/lint.scm (check-patch-file-names): Don't check if patches
start with the package full name since matching the package name (which
is a prefix of the full name) is sufficient.
| Mathieu Lirzin |
2016-01-20 | import: Add Bioconductor importer and updater....* guix/import/cran.scm (%bioconductor-updater,
latest-bioconductor-release, bioconductor-package?): New procedures.
(cran->guix-package): Support repositories other than CRAN.
(%bioconductor-url, %bioconductor-svn-url): New variables.
(description->package): Update signature to distinguish between packages
from different repositories.
(latest-release): Rename procedure ...
(latest-cran-release): ... to this.
(cran-package?): Do not assume all R packages are available on CRAN.
* tests/cran.scm: Update tests.
* guix/scripts/import/cran.scm: Add "--archive" option and default to
CRAN.
* guix/scripts/refresh.scm (%updaters): Add "%bioconductor-updater".
* doc/guix.texi: Document Bioconductor importer and updater.
| Ricardo Wurmus |
2016-01-19 | guix build: Add '--keep-going'....* guix/scripts/build.scm (show-build-options-help)
(%standard-build-options): Add --keep-going.
* guix/scripts/build.scm (set-build-options-from-command-line): Honor
it.
* doc/guix.texi (Invoking guix build): Document it.
| Ludovic Courtès |
2016-01-16 | Move <boot-parameters> to (gnu system)....* guix/scripts/system.scm (previous-grub-entries)
(display-system-generation): Use accessors instead of matching
<boot-parameters>.
(boot-parameters, boot-parameters?, boot-parameters-label)
(boot-parameters-root-device, boot-parameters-kernel)
(boot-parameters-kernel-arguments, read-boot-parameters): Move to...
* gnu/system.scm: ... here. Export them.
| Alex Kost |
2016-01-06 | lint: cve: Catch host name lookup errors....* guix/scripts/lint.scm (package-vulnerabilities): Catch
'getaddrinfo-error'.
| Ludovic Courtès |
2016-01-05 | guix package: Allow multiple '--search' flags....* guix/scripts/package.scm (find-packages-by-description): Change 'rx'
parameter to 'regexps'.
[matches-all?, matches-one?]: New procedures.
Use them.
(process-query): Collect regexps from all 'search' queries, and pass
them to 'find-packages-by-description'.
* tests/guix-package.sh: Add tests.
* doc/guix.texi (Invoking guix package): Document it.
| Ludovic Courtès |
2016-01-02 | graph: %BAG-WITH-ORIGINS-NODE-TYPE includes the origin's guile....Before that it would include #f for most origins since that the default
value of 'origin-patch-guile'.
* guix/scripts/graph.scm (bag-node-edges): When 'origin-patch-guile'
returns #f, use (default-guile).
* tests/graph.scm ("bag DAG, including origins"): Check for an edge from
O to (default-guile).
| Ludovic Courtès |
2016-01-02 | graph: %BAG-EMERGED-NODE-TYPE filters out origins....Fixes <http://bugs.gnu.org/22280>.
Reported by Leo Famulari <leo@famulari.name>.
* guix/scripts/graph.scm (%bag-emerged-node-type)[edges]: Mimic
%BAG-NODE-TYPE. This is a followup to 38b92da.
| Ludovic Courtès |
2015-12-30 | guix build: Augment %PATCH-PATH when -L is passed....Fixes <http://bugs.gnu.org/22259>.
Reported by Nikolay Merinov <nikolay.merinov@member.fsf.org>.
* guix/scripts/build.scm (%standard-build-options) <-L>: Augment
%PATCH-PATH.
* tests/guix-package.sh: Add test.
| Ludovic Courtès |
2015-12-25 | guix package: Fix typo in comment....* guix/scripts/package.scm: Fix typo.
| Leo Famulari |
2015-12-20 | lint: The CPE name of GRUB is "grub2"....Reported by Leo Famulari.
* guix/scripts/lint.scm (package-name->cpe-name): Add "grub".
| Ludovic Courtès |
2015-12-13 | guix build: Gracefully handle type errors in -e and -f....* guix/scripts/build.scm (options->things-to-build)[validate-type]: New
procedure.
[ensure-list]: Use it.
| Ludovic Courtès |
2015-12-13 | guix build: Remove dead code....* guix/scripts/build.scm (options->things-to-build): Remove unused
'match' clause.
| Ludovic Courtès |
2015-12-09 | guix build: Add '--check'....* guix/derivations.scm (build-derivations): Add optional 'mode'
parameter.
* guix/scripts/build.scm (%default-options): Add 'build-mode'.
(show-help, %options): Add '--check'.
(guix-build): Honor 'build-mode' key of OPTS. Pass it to
'show-what-to-build' and 'build-derivations'.
* doc/guix.texi (Invoking guix build): Document it.
(Substitutes): Mention it.
| Ludovic Courtès |