Commit Graph

1289 Commits

Author SHA1 Message Date
Ludovic Courtès a0f352b30f
pack: Add '--entry-point'.
* guix/scripts/pack.scm (self-contained-tarball): Add #:entry-point and
warn when it's true.
(squashfs-image): Add #:entry-point and honor it.
(docker-image): Add #:entry-point and honor it.
(%options, show-help): Add '--entry-point'.
(guix-pack): Honor '--entry-point' and pass #:entry-point to BUILD-IMAGE.
* gnu/tests/docker.scm (run-docker-test): Test 'docker run' with the
default entry point.
(build-tarball&run-docker-test): Pass #:entry-point to 'docker-image'.
* doc/guix.texi (Invoking guix pack): Document it.
* gnu/tests/singularity.scm (run-singularity-test)["singularity run"]:
New test.
(build-tarball&run-singularity-test): Pass #:entry-point to
'squashfs-image'.
2019-06-07 09:57:19 +02:00
Ludovic Courtès b7178c22bf
syscalls: Add 'with-file-lock' macro.
* guix/scripts/offload.scm (lock-file, unlock-file, with-file-lock):
Move to...
* guix/build/syscalls.scm: ... here.
2019-06-05 23:10:36 +02:00
Ludovic Courtès bcb7c900cc
guix package: Do not list environment variables that need to be set.
Fixes <https://bugs.gnu.org/35942>.

* guix/scripts/package.scm (display-search-paths): Rename to...
(display-search-path-hint): ... this.  Adjust callers.
Remove #:kind parameter.  Replace the list of environment variables with
an invitation to source $GUIX_PROFILE/etc/profile or run 'guix package
--search-paths'.
2019-06-05 23:10:36 +02:00
Ludovic Courtès b90ae065b5
substitute: Select the best compression methods.
When a server publishes several URLs with different compression methods,
'guix substitute' can now choose the best one among the compression
methods that it supports.

* guix/scripts/substitute.scm (<narinfo>)[uri]: Replace with...
[uris]: ... this.
[compression]: Replace with...
[compressions]: ... this.
[file-size]: Replace with...
[file-sizes]: ... this.
[file-hash]: Replace with...
[file-hashes]: ... this.
(narinfo-maker): Adjust accordingly.  Ensure 'file-sizes' and
'file-hashes' have the right length.
(assert-valid-signature, valid-narinfo?): Use the first element of
'narinfo-uris' in error messages.
(read-narinfo): Expect "URL", "Compression", "FileSize", and "FileHash"
to occur multiple times.
(display-narinfo-data): Call 'select-uri' to determine the file size.
(%compression-methods): New variable.
(supported-compression?, compresses-better?, select-uri): New
procedures.
(process-substitution): Call 'select-uri' to select the URI and
compression.
* guix/scripts/weather.scm (report-server-coverage): Account for all the
values returned by 'narinfo-file-sizes'.
* tests/substitute.scm ("substitute, narinfo with several URLs"): New
test.
2019-06-02 22:01:57 +02:00
Ludovic Courtès b8fa86adfc
publish: '--compression' can be repeated.
This allows 'guix publish' to compress and advertise multiple
compression methods from which users can choose.

* guix/scripts/publish.scm (actual-compression): Rename to...
(actual-compressions): ... this.  Expect REQUESTED to be a list, and
always return a list.
(%default-options): Remove 'compression.
(store-item->recutils): New procedure.
(narinfo-string): Change #:compression to #:compressions (plural).
Adjust accordingly.
(render-narinfo, render-narinfo/cached): Likewise.
(bake-narinfo+nar): Change #:compression to #:compressions.
[compressed-nar-size]: New procedure.
Call 'compress-nar' for each item returned by 'actual-compressions'.
Create a narinfo for each compression.
(effective-compression): New procedure.
(make-request-handler): Change #:compression to #:compressions.
Use 'effective-compression' to determine the applicable compression.
(guix-publish): Adjust handling of '--compression'.
Print a message for each compression that is enabled.
* tests/publish.scm ("/*.narinfo"): Adjust to new narinfo field
ordering.
("/*.narinfo with properly encoded '+' sign"): Likewise.
("/*.narinfo with lzip + gzip"): New test.
("with cache, lzip + gzip"): New test.
* doc/guix.texi (Invoking guix publish): Document it.
2019-06-02 22:01:57 +02:00
Ludovic Courtès 73bddab545
publish: Factorize 'compress-nar'.
* guix/scripts/publish.scm (compress-nar): New procedure.
(bake-narinfo+nar): Use it.
2019-05-29 23:16:49 +02:00
Ludovic Courtès e84e036943
publish: Remove outdated comment.
* guix/scripts/publish.scm (make-request-handler): Remove outdated TODO.
2019-05-29 23:16:49 +02:00
Ludovic Courtès 35d1354fe8
publish: Display the compression method and level in use.
* guix/scripts/publish.scm (guix-publish): Use 'info' instead of
'format' for the initial message.  When COMPRESSION is true, display the
method and level in use.
2019-05-27 22:47:24 +02:00
Ludovic Courtès 66229b04ae
publish: Add support for lzip.
* guix/scripts/publish.scm (show-help, %options): Support '-C METHOD'
and '-C METHOD:LEVEL'.
(default-compression): New procedure.
(bake-narinfo+nar): Add lzip.
(nar-response-port): Likewise.
(string->compression-type): New procedure.
(make-request-handler): Generalize /nar/gzip handler to handle /nar/lzip
as well.
* tests/publish.scm ("/nar/lzip/*"): New test.
("/*.narinfo with lzip compression"): New test.
* doc/guix.texi (Invoking guix publish): Document it.
(Requirements): Mention lzlib.
2019-05-27 22:47:24 +02:00
Ludovic Courtès 493375cdb2
publish: Maintain a hash-part-to-store-item mapping in cache.
Fixes <https://bugs.gnu.org/33897>.

* guix/scripts/publish.scm (hash-part-mapping-cache-file)
(hash-part->path*): New procedures.
* guix/scripts/publish.scm (render-narinfo/cached)[delete-entry]: Delete
the 'hash-part-mapping-cache-file'.
Use 'hash-part->path*' instead of 'hash-part->path'.
* tests/publish.scm ("with cache, vanishing item"): New test.
2019-05-26 01:34:17 +02:00
Ludovic Courtès b1903b99e0
weather: Accept package specs on the command line.
Previously, non-option arguments would be ignored.  Now it puts them to
good use.

* guix/scripts/weather.scm (guix-weather)[package-list]: New procedure.
Use it.
* doc/guix.texi (Invoking guix weather): Adjust accordingly.
2019-05-22 00:09:42 +02:00
Ludovic Courtès 3f8326237d
pack: Warn when building an empty pack.
* guix/scripts/pack.scm (guix-pack): Warn when MANIFEST has zero
entries.
2019-05-22 00:09:41 +02:00
Ludovic Courtès fd214f1522
pack: Add '--root'.
* guix/scripts/pack.scm (%options, show-help): Add "--root".
(guix-pack): Honor it.
* tests/guix-pack.sh: Test it.
* doc/guix.texi (Invoking guix pack): Document it.
2019-05-22 00:09:41 +02:00
Ludovic Courtès ce10e6053b
guix system: Type-check the file or expression.
Previously, users would get a wrong-type-arg exception down the road
with an intimidating backtrace.

* guix/scripts/system.scm (process-action)[ensure-operating-system]: New
procedure.
Use it.
2019-05-16 13:24:06 +02:00
Ludovic Courtès 45d41c035e
guix build: Gracefully handle invalid '--with-git-url' specs.
* guix/scripts/build.scm (transform-package-source-git-url): Add case
for when 'string-split' does not return exactly two elements.
2019-05-14 12:11:05 +02:00
Maxim Cournoyer d03de6be0a
vm: Auto-detect if inputs should be registered.
The default value of the argument REGISTER-CLOSURE? of the ISO9660-IMAGE,
QEMU-IMAGE and SYSTEM-DOCKER-IMAGE procedures can be computed automatically,
since the operating-system definition is available in its context.  When the
operating-system definition does not contain the GUIX-SERVICE-TYPE, do not
register the closure in the database of Guix, as it takes time and doesn't
serve a purpose.

* gnu/system/vm.scm (has-guix-service-type): Add predicate.
(iso9660-image)[register-closures?]: Use it to compute the argument's default
value.
(qemu-image)[register-closures?]: Likewise, and update docstring.
(system-docker-image)[register-closures?]: Likewise.
(system-disk-image): Do not explicit a value for the REGISTER-CLOSURES?
argument of the ISO9660-IMAGE and QEMU-IMAGE procedure calls, so that its
default value is used instead.
* guix/scripts/system.scm (system-derivation-for-action): Do not explicit a
value for the REGISTER-CLOSURES? argument of the SYSTEM-DOCKER-IMAGE
procedure call, so that its default value is used instead.
2019-05-13 22:59:09 -04:00
Arun Isaac b33454ae0b
linux-container: Support container network sharing.
* gnu/system/linux-container.scm (container-essential-services): If network is
to be shared with the host, remove network configuration files from etc
service.
(containerized-operating-system): If network is to be shared with the host,
remove nscd service and map host's /var/run/nscd if it exists.
(container-script): If network is to be shared with the host, do not create
network namespace.
* guix/scripts/system.scm (system-derivation-for-action): Add
#:container-shared-network? argument.
(perform-action): Add #:container-shared-network? argument.
(show-help): Add "-N, --network" help information.
(%options): Add network option.
(process-action): Call perform-action with #container-shared-network? argument.
* doc/guix.texi (Invoking guix system): Document the "-N, --network" option.

Co-authored-by: Christopher Baines <mail@cbaines.net>
2019-05-14 02:54:58 +05:30
Ludovic Courtès a0dc97a517
pull: Display 'hash guix' hint when the new and old 'guix' are different.
Fixes <https://bugs.gnu.org/35601>.
Reported by Diego Nicola Barbato <dnbarbato@posteo.de>.

Previously we were calling (which "guix") after the new profile had been
built and symlinked, so in most cases the hint would not be triggered,
even though it should have been triggered.

* guix/scripts/pull.scm (build-and-install)[guix-command]: New variable.
Compare PROFILE/bin/guix against GUIX-COMMAND.
2019-05-09 17:42:31 +02:00
Chris Marusich 387e6b9e34
ui: Make package outputs searchable.
* guix/ui.scm (relevance): Allow the "field" procedure of a metric to
return a list, and handle that case appropriately.  Update docstring.
(%package-metrics): Add a metric for package outputs.
* guix/scripts/package.scm (find-packages-by-description): Update
docstring.
* tests/guix-package.sh: Add a test case to verify that package outputs are
included in search results.

Co-authored-by: Tobias Geerinckx-Rice <me@tobias.gr>
2019-05-09 00:10:34 -07:00
Ludovic Courtès d108f59761
environment: Non ad-hoc mode also honors transformation options.
Fixes <https://bugs.gnu.org/35618>.
Reported by Florent Pruvost <florent.pruvost@inria.fr>.

* guix/scripts/environment.scm (options/resolve-packages): Add call to
TRANSFORM in non "ad-hoc" case.
* tests/guix-environment.sh: Add test.
2019-05-07 15:46:53 +02:00
Ludovic Courtès 757e633d57
build: Change default substitute server to "ci.guix.gnu.org".
* config-daemon.ac: Replace "ci.guix.info" with "ci.guix.gnu.org".
* doc/guix.texi (SUBSTITUTE-SERVER): Likewise.
* etc/substitutes/ci.guix.gnu.org.pub: New file.
* Makefile.am (dist_pkgdata_DATA): Add it.
* guix/scripts/build.scm (%default-log-urls): Update.
* guix/scripts/substitute.scm (%default-substitute-urls): Likewise.
* guix/store.scm (%default-substitute-urls): Likewise.
* guix/self.scm (miscellaneous-files): Add "ci.guix.gnu.org".
2019-05-01 11:05:47 +02:00
Ludovic Courtès c20d4cac1f
processes: Gracefully handle daemons without clients.
Fixes <https://bugs.gnu.org/34716>.
Reported by Mark H Weaver <mhw@netris.org>.

The problem could be reproduced by running, on one hand:

  sh -c 'exec -a guix-daemon sleep 777'

and on the other hand:

  guix processes

If there is no process with PID 777, 'guix processes' would barf as it
stumbles upon a <daemon-session> record whose client is #f.

* guix/scripts/processes.scm (daemon-sessions)[child-process->session]:
New procedure, with lambda formerly passed to 'map'.  Handle #f returns
from 'lookup-process'.
Call 'child-process->session' within 'filter-map', not just 'map'.
2019-04-29 21:54:10 +02:00
Ludovic Courtès c21d912a02
processes: 'process-open-files' ignores disappeared /proc/PID/fd entries.
Previously, 'process-open-files' would throw ENOENT if an entry had
vanished after the 'scandir' call and before the 'readlink' call.

* guix/scripts/processes.scm (process-open-files): Catch ENOENT errors
from 'readlink'.
2019-04-29 21:39:38 +02:00
Ludovic Courtès da56f10971
guix package: Add 'guix search' alias.
* guix/scripts/search.scm: New file.
* Makefile.am (MODULES): Add it.
* po/guix/POTFILES.in: Add it.
* tests/guix-package-aliases.sh: Add test.
* doc/guix.texi (Invoking guix package): Document it and use it in a
couple of examples.
2019-04-29 12:19:24 +02:00
Ludovic Courtès d824cfbabe
guix package: Add 'install', 'remove', and 'upgrade' aliases.
* guix/scripts/install.scm, guix/scripts/remove.scm,
guix/scripts/upgrade.scm, tests/guix-package-aliases.sh: New files.
* Makefile.am (MODULES, SH_TESTS): Add them.
* po/guix/POTFILES.in: Add them.
* guix/scripts/package.scm (guix-package): Split with...
(guix-package*): ... this.  New procedure.
* doc/guix.texi (Invoking guix package): Document them.
(Binary Installation, Application Setup, Package Management)
(Packages with Multiple Outputs, Package Modules)
(X.509 Certificates, Installing Debugging Files): Use 'guix install' in
simple examples.
* etc/completion/bash/guix (_guix_complete): Handle "install", "remove",
and "upgrade".
2019-04-29 10:13:44 +02:00
Ludovic Courtès 0663302618
describe: Provide a hint when origin detection fails.
* guix/scripts/describe.scm (display-checkout-info): Add call to
'display-hint' in the error case.
2019-04-28 22:57:06 +02:00
Ludovic Courtès af41e504cf
guix system: Compute 'bootcfg' only for 'init' and 'reconfigure'.
Previously, 'guix system vm' would start by computing the bootcfg
derivation, which itself depended on an incorrect OS derivation (for the
original OS instead of the one passed through
'virtualized-operating-system'.)  That added overhead and would force
the user's config file to define a root file system, for example, even
though it makes no sense in the case of a VM.

* guix/scripts/system.scm (perform-action)[bootcfg]: Limit to the 'init'
and 'reconfigure' actions.
2019-04-23 23:44:35 +02:00
Ludovic Courtès a06a95baff
pull: Create profile after the store connection has been opened.
Fixes <https://bugs.gnu.org/35341>.
Reported by Florian Pelz <pelzflorian@pelzflorian.de>.

Previously, we'd call 'ensure-default-profile' before the connection to
the daemon has been opened.  On the first connection, the daemon ensures
that /var/guix/profiles/per-user is world-writable.  Since we were
calling 'ensure-default-profile' before that,
/var/guix/profiles/per-user was typically non-writable (555 and
root-owned), and thus 'guix pull' would error out.

* guix/scripts/pull.scm (guix-pull): Call 'ensure-default-profile'
within 'with-store'.
2019-04-22 12:01:32 +02:00
Ludovic Courtès c5265a0951
pull: Add '--news'.
Suggested by Tobias Geerinckx-Rice <me@tobias.gr>.

* guix/scripts/pull.scm (%options, show-help): Add '--news'.
(display-profile-news): Add #:current-is-newer? and #:concise?.
Honor them.
(build-and-install): Pass #:concise? #t.
(display-new/upgraded-packages)[concise/max-item-count]: New variable.
Add call to 'display-hint'.
(process-query): Add clause for 'display-news'.
* doc/guix.texi (Invoking guix pull): Add '--news'.
2019-04-22 12:01:32 +02:00
Ludovic Courtès ea261dea0c
guix build: Accept multiple '-s' options.
* guix/scripts/build.scm (%default-options): Remove 'system'.
(%options) <--system>: Keep previous occurrences of 'system in RESULT.
(options->derivations)[system]: Remove.
[systems, things-to-build]: New variables.
[compute-derivation]: New procedure.
Iterate on all of SYSTEMS to compute the derivations of THINGS-TO-BUILD.
* tests/guix-build.sh: Add test for one and multiple '-s' flags.
* doc/guix.texi (Additional Build Options): Document this behavior.
2019-04-19 17:46:40 +02:00
Ludovic Courtès 702c3c7dab
lint: 'check-github-url' uses our own 'open-connection-for-uri'.
Fixes <https://bugs.gnu.org/35053>.
Reported by Efraim Flashner <efraim@flashner.co.il>.

Previously 'check-github-url' would let Guile 2.2's (web client) module
take care of opening the connection.  Consequently, it wouldn't use the
TLS priority strings that we use in (guix build download),
'open-connection-for-uri'.  In particular, it would not disable TLSv1.3,
which would trigger <https://bugs.gnu.org/34102> for github.com.

* guix/scripts/lint.scm (check-github-url): Add #:timeout parameter.
[follow-redirect]: Change parameter name to 'url' and pass it to
'string->uri'.  Call 'guix:open-connection-for-uri' to open the
connection and pass it to 'http-head' via #:port.
2019-04-18 17:43:56 +02:00
Ludovic Courtès 72f749dcb8
pull: '--url', '--commit', and '--branch' apply to the 'guix' channel.
Suggested by pkill9 <pkill9@runbox.com>.

* guix/scripts/pull.scm (channel-list): Apply REF and URL to the 'guix'
channel.
* doc/guix.texi (Invoking guix pull): Adjust accordingly.
2019-04-17 13:56:40 +02:00
Ludovic Courtès 4aea820f09
guix build: Fix relative file name canonicalization for '--root'.
Fixes <https://bugs.gnu.org/35271>.
Reported by rendaw <7e9wc56emjakcm@s.rendaw.me>.

* guix/scripts/build.scm (register-root): When ROOT is a relative file
name, append the basename of ROOT, not ROOT itself.
* tests/guix-build.sh: Add test.
2019-04-15 16:57:12 +02:00
Ludovic Courtès c1df77e215
guix gc: '-d' does not attempt to delete non-user-owned roots.
* guix/scripts/gc.scm (guix-gc)[delete-generations]: Limit to user-owned
roots, unless we're running as root.
2019-04-11 18:18:13 +02:00
Ludovic Courtès 96b8c2e6e2
guix gc: Add '--delete-generations'.
* guix/scripts/gc.scm (show-help, %options): Add
'--delete-generations'.  Change '--delete' shorthand to '-D'.
(delete-old-generations): New procedure.
(guix-gc)[delete-generations]: New procedure.
Call it when ACTION is 'collect-garbage' and OPTS contains
'delete-generations.
* doc/guix.texi (Invoking guix gc): Document it.
2019-04-10 17:09:47 +02:00
Ludovic Courtès bacf980c76
guix gc: Add '--list-roots'.
* guix/scripts/gc.scm (show-help, %options): Add '--list-roots'.
(guix-gc)[list-roots]: New procedure.
Handle '--list-roots'.
* tests/guix-gc.sh: Test it.
* doc/guix.texi (Invoking guix gc): Document it.
2019-04-10 17:09:47 +02:00
Ludovic Courtès 08d0f950b3
pull: Remove duplicate '--dry-run' description.
Reported by pkill9.

* guix/scripts/pull.scm (show-help): Remove duplicate '--dry-run'
description.
2019-04-10 17:09:47 +02:00
Ludovic Courtès 21b3c0ca87
guix package: Use absolute file names in search path recommendations.
Suggested by Chris Marusich.

* guix/scripts/package.scm (absolutize): New procedure.
(display-search-paths): Use it.
2019-04-10 12:40:58 +02:00
Ludovic Courtès 1199da08aa
size: Optimize dependency size computation.
This reduces 'guix size' run time by ~4% here:

  items="$(guix build icecat inkscape emacs libreoffice)"
  guix size $items

* guix/scripts/size.scm (store-profile): Define 'size-table' and use it
to lookup the size of ITEM in 'dependency-size'.
2019-04-07 11:36:00 +02:00
Ludovic Courtès 985730c1af
scripts: More commands default to verbosity level 1.
* guix/scripts/environment.scm (%default-options): Change 'verbosity' to 1.
* guix/scripts/pack.scm (%default-options): Likewise.
* guix/scripts/system.scm (guix-system): Likewise, except for the
'build' command.
2019-04-04 17:47:02 +02:00
Ludovic Courtès c1ef50ac79
gexp: Remove workarounds for <https://bugs.gnu.org/15602>.
* gnu/services/base.scm (hydra-key-authorization)[aaa]: Remove.
[default-acl]: Don't import it.
* guix/scripts/pack.scm (store-database)[build]: Don't import
(gnu build install).
2019-04-04 17:47:02 +02:00
Ludovic Courtès 1ccc0f807d
environment: '-C' creates namespaces where the user is not root.
* guix/scripts/environment.scm (launch-environment/container): Add UID
and GID.  Use them in PASSWD and GROUPS.  Pass them as #:guest-uid and
 #:guest-gid to 'call-with-container'.
* tests/guix-environment-container.sh: Test the inner UID.
In '--user' test, replace hard-coded 0 with 1000.
* doc/guix.texi (Invoking guix environment): Adjust accordingly.
2019-04-02 18:15:37 +02:00
Ludovic Courtès 539af7f257
pull: Truncate the list of packages displayed on completion.
Previously, if you'd run 'guix pull' after a couple of weeks, it would
fill your screen with package names, which is unhelpful.

* guix/scripts/pull.scm (ellipsis): New procedure.
(display-new/upgraded-packages): Add #:concise?.
[list->enumeration]: New procedure.
Use it instead of 'string-join'.
(display-profile-news): Pass #:concise? #t.
2019-03-28 23:06:59 +01:00
Ludovic Courtès 9f4169f6c8
pull: Factorize pretty-printing for new/upgraded package lists.
* guix/scripts/pull.scm (display-new/upgraded-packages)[pretty]: New
procedure.
Use it.
2019-03-28 23:06:58 +01:00
Ludovic Courtès 42314ffa07
refresh: Update the source code URL.
Reported by Tobias Geerinckx-Rice <me@tobias.gr>
in <https://bugs.gnu.org/35010>.

* guix/upstream.scm (update-package-source): Take 'source' instead of
'version' as the second argument.
[update-expression]: Change to take 'replacements', a list of
replacement pairs.
Compute OLD-URL and NEW-URL and replace the dirname of the OLD-URL with
that of NEW-URL.
* guix/scripts/refresh.scm (update-package): Adjust call to
'update-package-source' accordingly.
2019-03-27 14:59:42 +01:00
Ludovic Courtès 1ee3d2dcb8
upstream: 'package-update' returns the <upstream-source> object.
Fixes a regression introduced in
abd4d6b33d, where CHANGES would no longer
be a thunk.

Reported by Ricardo Wurmus.

* guix/upstream.scm (package-update/url-fetch): Return SOURCE as the
third value instead of CHANGES.
* guix/scripts/refresh.scm (update-package): Adjust accordingly.
2019-03-27 14:59:41 +01:00
Ludovic Courtès 952afb6f8c
environment: Create /etc/group in containers.
Reported by Pierre Neidhardt <mail@ambrevar.xyz>.

* guix/scripts/environment.scm (launch-environment/container): Create
GROUPS and call 'write-group'.
* tests/guix-environment-container.sh: Test it.
2019-03-26 18:11:52 +01:00
Ludovic Courtès 8a9922bdee
environment: Use (gnu build accounts) for /etc/passwd handling.
* guix/scripts/environment.scm (launch-environment/container): Remove
call to 'mock-passwd'; instantiate a <password-entry> instead.  Call
'write-passwd' to write the pasword database instead of using custom
code.
(mock-passwd): Remove.
* tests/guix-environment-container.sh: Test 'getpwuid'.
2019-03-26 18:11:52 +01:00
Ludovic Courtès a53ecfc897
graph: Factorize calls to 'fold-packages'.
* guix/scripts/graph.scm (all-packages): New procedure.
(%reverse-package-node-type, %reverse-bag-node-type): Use 'all-packages'
instead of 'fold-packages'.
2019-03-23 18:15:36 +01:00
Ludovic Courtès 2b81eac01e
graph: Add the 'reverse-bag' graph.
Suggested by Julien Lepiller.

* guix/scripts/graph.scm (%reverse-bag-node-type): New variable.
(%node-types): Add it.
* tests/graph.scm ("reverse bag DAG"): New test.
* doc/guix.texi (Invoking guix graph): Document it.
2019-03-23 18:15:36 +01:00