download: Don't report the progress too fast.

* guix/utils.scm (<progress-reporter>): New record type.
(call-with-progress-reporter): New procedure.
* guix/build/download.scm (dump-port*, rate-limited, progress-reporter/file):
New procedures.
(ftp-fetch, http-fetch): Use 'dump-port*'.
(progress-proc): Remove procedure.
* guix/scripts/substitute.scm (progress-report-port): Rewrite in terms of
<progress-reporter>.
(process-substitution): Adjust accordingly.

substitute: Close the download port after substitution finished.

* guix/scripts/substitute.scm (progress-substitution): Call 'close-port'
after 'restore-file'.

guix system: Add 'search' command.

* guix/scripts/system.scm (resolve-subcommand): New procedure.
(process-command): Handle 'search'.
(guix-system): Likewise.
(show-help): Augment.
* guix/scripts/system/search.scm: New file.
* po/guix/POTFILES.in: Add it.
* Makefile.am (MODULES): Add it.
* guix/ui.scm (%text-width): Export.
* doc/guix.texi (Invoking guix system): Document it.
(Service Types and Services): Mention 'guix system search'.
* tests/guix-system.sh: Test it.

ui: Generalize relevance computation.

* guix/ui.scm (relevance, package-relevance): New procedures.
(%package-metrics): New variable.
* guix/scripts/package.scm (find-packages-by-description)[score]
[package-score]: Remove.  Use 'package-relevance' instead.

guix download: Honor mirrors when using '-o'.

Previously "guix download -o x mirror://gnu/…" would fail.

* guix/scripts/download.scm (download-to-file): Pass #:mirrors to
'url-fetch'.

guix system: Pretty-print device UUIDs.

* guix/scripts/system.scm (display-system-generation): Check if
ROOT-DEVICE is a UUID and pretty-print it if it is.

substitute: Download from unauthorized sources that provide the right content.

This allows substitutes to be downloaded from unauthorized servers, as
long as they advertise the same hash and references as one of the
authorized servers.

* guix/scripts/substitute.scm (assert-valid-narinfo): Remove.
(valid-narinfo?): Add #:verbose?.  Handle each case of
'signature-case'.
(equivalent-narinfo?): New procedure.
(lookup-narinfos/diverse): Add 'authorized?' parameter and honor it.
[select-hit]: New procedure.
(lookup-narinfo): Add 'authorized?' parameter and pass it.
(process-query): Adjust callers accordingly.
(process-substitution): Remove call to 'assert-valid-narinfo'.  Check
whether 'lookup-narinfo' returns true and call 'leave' if not.
* tests/substitute.scm (%main-substitute-directory)
(%alternate-substitute-directory): New variables.
(call-with-narinfo): Make 'narinfo-directory' a parameter.  Call
'mkdir-p' to create it.  Change unwind handler to check whether
CACHE-DIRECTORY exists before deleting it.
(with-narinfo*): New macro.
("substitute, no signature")
("substitute, invalid hash")
("substitute, unauthorized key"): Change expected error message to "no
valid substitute".
("substitute, unauthorized narinfo comes first")
("substitute, unsigned narinfo comes first")
("substitute, first narinfo is unsigned and has wrong hash")
("substitute, first narinfo is unsigned and has wrong refs")
("substitute, unsigned narinfo comes first")
("substitute, two invalid narinfos"): New tests.
* doc/guix.texi (Substitutes): Explain the new behavior.

substitute: Make substitute URLs a SRFI-39 parameter.

* guix/scripts/substitute.scm (%cache-urls): Rename to...
(%default-substitute-urls): ... this.
(substitute-urls): New variable.
(guix-substitute): Use it instead of %CACHE-URLS.
* tests/substitute.scm: Likewise.

size: Default to '--sort=self'.

* guix/scripts/size.scm (%default-options): Change default value for
'profile<?.
* doc/guix.texi (Invoking guix size): Adjust accordingly.

Handle the same HTTP redirects everywhere.

* guix/build/download.scm (http-fetch): Complete the hard-coded list of HTTP
redirection status codes.
* guix/http-client.scm (http-fetch): Likewise.
* guix/scripts/lint.scm (probe-uri): Likewise.

scripts: Remove 'max-silent-time' from the default options.

Fixes <http://bugs.gnu.org/27157>.

Having a finite default `max-silent-time' value for scripts such as 'guix
environment' could lead to timeouts when building subtitutes; this was
undesirable.

This change also fixes client behavior to match the documentation, which
is that by default the daemon's settings are honored.

* guix/scripts/archive.scm (%default-options): Remove max-silent-time entry.
* guix/scripts/copy.scm (%default-options): Likewise.
* guix/scripts/environment.scm (%default-options): Likewise.
* guix/scripts/pack.scm (%default-options): Likewise.
* guix/scripts/package.scm (%default-options): Likewise.
* guix/scripts/pull.scm (%default-options): Likewise.
* guix/scripts/system.scm (%default-options): Likewise.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: bootloader: Deprecate "device" field in favor of "target".

* gnu/bootloader.scm (<bootloader-configuration>): Deprecate "device" field in
favor of "target" field.  This is mostly a renaming but also a generalization
to support UEFI targets being paths to a mounted partition instead of a device
name.
* gnu/system/examples/bare-bones.tmpl:
* gnu/system/examples/desktop.tmpl:
* gnu/system/examples/lightweight-desktop.tmpl:
* gnu/system/examples/vm-image.tmpl:
* gnu/system/install.scm:
* gnu/tests.scm:
* gnu/tests/install.scm:
* gnu/tests/nfs.scm:
* tests/system.scm: Adapt all invocations of bootloader-configuration.
* guix/scripts/system.scm (perform-action): Rename device argument to
bootloader-target.
(process-action): Adapt caller.
* doc/guix.texi (Proceeding with the Installation):
* doc/guix.texi (Bootloader Configuration): Update documentation.

gnu: scripts: Cleanup regarding "gnu system" bootloader devices.

* guix/scripts/system.scm (install-bootloader, install): Remove unused
"device" argument.
(reinstall-bootloader, perform-action): Adapt callers.

Merge branch 'master' into core-updates

guix download: Support retrieving local file without the URI scheme.

* guix/scripts/download.scm (guix-download): Treat the URL argument as a local
file path when it fails on 'string->uri'.  Call 'fetch' with the processed
'uri' instead of the original URL argument.
* tests/guix-download.sh: Adjust accordingly.

pack: Add "none" compressor.

* guix/scripts/pack.scm (%compressors): Add compressor "none"; prepend
extension with ".".
(self-contained-tarball, docker-image): Assume compressor extensions start
with period.
* doc/guix.texi (Invoking guix pack): Document it.

Merge branch 'master' into core-updates

pull: Honor '--no-grafts'.

* guix/scripts/pull.scm (guix-pull): Parameterize %GRAFT? as a function
of OPTS.

pull: Use the commit ID as the version string.

* guix/scripts/pull.scm (build-from-source): Add #:commit parameter.
Pass it to BUILD.
(build-and-install): Add #:commit and pass it to 'build-from-source'.
(guix-pull): Pass #:commit to 'build-and-install'.

pull: Fetch source code from Git.

* guix/scripts/pull.scm (%snapshot-url, with-environment-variable)
(with-PATH): Remove.
(ensure-guile-git!): New procedure.
(%repository-url): New variable.
(%default-options): Add 'repository-url' and 'ref'.
(show-help, %options): Add '--commit' and '--url'.
(temporary-directory, first-directory, interned-then-deleted)
(unpack): Remove.
(build-from-source): Rename 'tarball' to 'source'.  Remove call to
'unpack'.
(build-and-install): Rename 'tarball' to 'source'.
(honor-lets-encrypt-certificates!, report-git-error): New procedures.
(with-git-error-handling): New macro.
(guix-pull)[fetch-tarball]: Remove.
Wrap body in 'with-git-error-handling'.  Rewrite to use
'latest-repository-commit'.
* build-aux/build-self.scm (build): Print an error message and exit when
GUILE-GIT is #f.
* doc/guix.texi (Invoking guix pull): Mention Git.  Document '--commit'
and '--branch'.