gnu: services: Add darkstat service.

* gnu/services/monitoring.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Monitoring Services): Document it.

services: guix: Add 'log-compression' option.

* gnu/services/base.scm (<guix-configuration>)[log-compression]: New
field.
(guix-shepherd-service): Use 'match-record' instead of 'match'.  Honor
'log-compression'.
* doc/guix.texi (Base Services): Document 'log-compression'.

publish: Publish build logs.

* guix/scripts/publish.scm (render-log-file): New procedure.
(make-request-handler): Add "log" case.
* tests/publish.scm ("/log/NAME")
("/log/NAME not found"): New tests.
* doc/guix.texi (Invoking guix publish): Document /log URLs.

doc: Mark zlib as mandatory, libbz2 as optional.

* doc/guix.texi (Requirements): Move zlib to mandatory and libbz2 to
optional.
* README: Ditto.

daemon: Add gzip log compression.

* nix/nix-daemon/guix-daemon.cc (GUIX_OPT_LOG_COMPRESSION): New macro.
(options): Mark "disable-log-compression" as hidden and add
"log-compression".
(parse_opt): Handle GUIX_OPT_LOG_COMPRESSION.
* nix/libstore/build.cc (DerivationGoal): Add 'gzLogFile'.
(openLogFile): Initialize it when 'logCompression' is COMPRESSION_GZIP.
(closeLogFile, handleChildOutput): Honor 'gzLogFile'.
* nix/libstore/globals.hh (Settings)[compressLog]: Remove.
[logCompression]: New field.
(CompressionType): New enum.
* nix/libstore/globals.cc (Settings::Settings): Initialize it.
(update): Remove '_get' call for 'compressLog'.
* nix/local.mk (guix_daemon_LDADD, guix_register_LDADD): Add -lz.
* guix/store.scm (log-file): Handle '.gz' log files.
* tests/guix-daemon.sh: Add test with '--log-compression=gzip'.
* doc/guix.texi (Invoking guix-daemon): Adjust accordingly.
* config-daemon.ac: Check for libz and zlib.h.

doc: Describe Wayland status.

* doc/guix.texi (Desktop Services): Add a paragraph about the current status of
Wayland in Guix.

doc: Fix typo.

* doc/guix.texi (Desktop Services): "orMATE" --> "or MATE".

gnu: services: Add MATE desktop service.

* gnu/services/desktop.scm (<mate-desktop-configuration>,
mate-desktop-service-type): New variable.
(mate-desktop-service): New public variable.

* doc/guix.texi (Desktop Services): Document the service.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>

services: networking: Add a dependency override mechanism to <static-networking>.

* gnu/services/networking.scm (<static-networking>)[requirement]: New field.
(static-networking-shepherd-service): Don't override requirement for loopback.
(static-networking-service): Expose 'requirement' parameter.  Default to UDEV.
* gnu/services/base.scm (%base-services): Add (requirement '()) for loopback service.
* doc/guix.texi (Networking Services): Document it.

doc: Fix typo.

* doc/guix.texi (Application Setup): Transpose words.

gnu, doc: Use HTTPS for cran.r-project.org home pages.

* gnu/packages/bioinformatics.scm (r-sparql, r-acsnminer, r-gkmsvm)
(r-maldiquant, r-gprofiler)[home-page]: Use HTTPS.
* gnu/packages/cran.scm (r-colorspace, r-auc, r-calibrate, r-shape)
(r-compare, r-proxy, r-sp, r-rmtstat, r-lmtest, r-inline, r-bbmle)
(r-lpsolve, r-energy, r-suppdists, r-ksamples, r-cvst, r-drr, r-prodlim)
(r-ddalpha, r-rcpproll, r-ipred, r-psych, r-truncnorm, r-rsolnp, r-laeken)
(r-vcd, r-ica, r-scatterplot3d)[home-page]: Likewise.
* gnu/packages/machine-learning.scm (r-adaptivesparsity, r-kernlab)
[home-page]: Likewise.
* gnu/packages/maths.scm (r-quadprog, r-pracma)[home-page]: Likewise.
* gnu/packages/statistics.scm (r-boot, r-cluster, r-codetools, r-foreign)
(r-kernsmooth, r-nlme, r-mgcv, r-rpart, r-dichromat, r-estimability)
(r-pheatmap, r-labeling, r-magrittr, r-munsell, r-rcolorbrewer, r-sendmailr)
(r-gdtools, r-acepack, r-formula, r-locfit, r-chron, r-coda, r-backports)
(r-brew, r-commonmark, r-rstudioapi, r-plotrix, r-gridbase, r-bitops)
(r-catools, r-xnomial, r-lambda-r, r-whoreadsthis, r-futile-options)
(r-futile-logger, r-segmented, r-snow, r-iterators, r-foreach, r-doparallel)
(r-domc, r-irlba, r-registry, r-e1071, r-bigmemory-sri, r-r-methodss3)
(r-tidyselect, r-base64, r-runit, r-sfsmisc, r-gtools, r-gdata, r-gplots)
(r-ztable, r-vipor, r-sourcetools, r-statmod, r-compquadform, r-mixtools)
(r-fastica, r-diptest, r-modeltools, r-flexmix, r-deoptimr, r-pcapp)
(r-rrcov, r-fit-models, r-robust, r-trimcluster, r-fpc, r-fnn)
(r-modelmetrics, r-nloptr, r-lme4, r-tclust, r-lubridate)[home-page]:
Likewise.
* gnu/packages/web.scm (r-htmltools, r-hwriter, r-rjson, r-rook)[home-page]:
Likewise.
* doc/guix.texi (Invoking guix import, Invoking guix refresh): Likewise.

services: messaging: Use HTTPS for prosody.im URLs.

* gnu/services/messaging.scm (prosody-configuration): Use HTTPS whenever
referring to prosody.im URLs in documentation.
* doc/guix.texi (Messaging Services): Likewise.

doc: Properly escape brackets.

This fixes a build failure reported by Catonano <catonano@gmail.com>.

* doc/guix.texi (Mail Services): Escape ‘{’ and ‘}’ everywhere.

gnu: dovecot: Update to 2.3.0.

* gnu/packages/mail.scm (dovecot): Update to 2.3.0.
* gnu/services/mail.scm (dovecot-configuration)[director-doveadm-port]
[ssl-parameters-regenerate]: Delete fields.
[ssl-protocols]: Rename to...
[ssl-min-protocol]: ...this.
[mail-log-prefix, mdbox-rotate-size, ssl-cipher-list, imap-logout-format]:
Update default values.
* doc/guix.texi (Mail Services): Reflect the above changes to the service.

doc: Add "/guix" after LOCALSTATEDIR.

Fixes <https://bugs.gnu.org/29813>.
Reported by Martin Castillo <castilma@uni-bremen.de>.

* doc/guix.texi (Invoking guix-daemon, Invoking guix package): Add
missing "/guix" after LOCALSTATEDIR.

guix build: Support '--with-source=PACKAGE@VERSION=URI'.

* guix/scripts/build.scm (numeric-extension?, tarball-base-name): New
procedures, formerly in 'package-with-source'.
(transform-package-source)[new-sources]: Look for '=' in URI.  Each
element of the list of now a (PKG VERSION SOURCE) tuple.
Pass VERSION to 'package-with-source'.
(package-with-source): Add 'version' parameter and honor it.
* tests/scripts-build.scm ("options->transformation, with-source, PKG=URI")
("options->transformation, with-source, PKG@VER=URI"): New tests.
* doc/guix.texi (Package Transformation Options): Document the new
forms.

services: urandom-seed: Deprecate the 'urandom-seed-service' procedure.

* gnu/services/base.scm (urandom-seed-service-type)[default-value]: New
field.
(urandom-seed-service): Mark as deprecated.
(%base-services): Use URANDOM-SEED-SERVICE-TYPE directly.
* gnu/services/base.scm (%base-services):
* doc/guix.texi (Base Services): Document 'urandom-seed-service-type'
instead of 'urandom-seed-service'.

doc: Document fixed-output derivations.

* doc/guix.texi (Derivations): Add paragraph on fixed-output
derivations.

services: urandom-seed: Try using a HWRNG to seed the Linux CRNG at boot.

* gnu/services/base.scm (urandom-seed-shepherd-service): Try to read from
'/dev/hwrng' at boot, as a supplement to any saved random seed.
* doc/guix.texi (Base Services): Document the new feature.

doc: Clarify treatment of the root account.

* doc/guix.texi (operating-system Reference): Clarify the situation of
UID 0.