* gnu/services.scm (directory-union): Use 'with-imported-modules'
instead of the '#:modules' argument of 'computed-file'.
* gnu/services/base.scm (udev-rules-union): Likewise.
* gnu/services/dbus.scm (system-service-directory): Likewise.
* gnu/services/desktop.scm (wrapped-dbus-service):
(polkit-directory): Likewise.
* gnu/services/networking.scm (tor-configuration->torrc): Likewise.
* gnu/services/xorg.scm (xorg-configuration-directory): Likewise.
* gnu/system/install.scm (self-contained-tarball): Likewise.
* gnu/system/linux-container.scm (container-script): Likewise.
* gnu/system/linux-initrd.scm (expression->initrd): Likewise, and
remove #:modules parameter.
(flat-linux-module-directory): Use 'with-imported-modules'.
(base-initrd): Likewise.
* gnu/system/locale.scm (locale-directory): Likewise.
* gnu/system/shadow.scm (default-skeletons): Likewise.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Likewise.
* gnu/tests/base.scm (run-basic-test): Likewise.
* gnu/tests/install.scm (run-install): Likewise.
* doc/guix.texi (Initial RAM Disk): Update 'expression->initrd'
documentation.

* guix/gexp.scm (<gexp>)[modules]: New field.
(gexp-modules): New procedure.
(gexp->derivation): Use it and append the result to %MODULES.
Update docstring to mark #:modules as deprecated.
(current-imported-modules, with-imported-modules): New macros.
(gexp): Pass CURRENT-IMPORTED-MODULES as second argument to 'gexp'.
(gexp->script): Use and honor 'gexp-modules'; define '%modules'.
* tests/gexp.scm ("gexp->derivation & with-imported-modules")
("gexp->derivation & nested with-imported-modules")
("gexp-modules & ungexp", "gexp-modules & ungexp-splicing"):
New tests.
("program-file"): Use 'with-imported-modules'.  Remove #:modules
argument to 'program-file'.
* doc/guix.texi (G-Expressions): Document 'with-imported-modules'.
Mark #:modules of 'gexp->derivation' as deprecated.
* emacs/guix-devel.el: Add syntax for 'with-imported-modules'.
(guix-devel-keywords): Add it.
* .dir-locals.el: Likewise.

* gnu/services/base.scm (<rngd-configuration>): New record type.
(rngd-service-type): New variable.
(rngd-service): New procedure.
* doc/guix.texi (Base Services): Document it.

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

* gnu/services/avahi.scm (<avahi-configuration>)[debug?]: New field.
(avahi-shepherd-service): Honor it.
(avahi-service): Add #:debug? and honor it.
* doc/guix.texi (Networking Services): Adjust accordingly.

* doc/guix.texi (Networking Services): Change #:name-services to
  #:name-servers.

Suggested by Danny Milosavljevic.

* doc/guix.texi (Scheduled Job Execution): Add unprivileged job example,
and show the use of thunks as job actions and gexps.

Reported by myglc2 <myglc2@gmail.com>.

* doc/guix.texi (Build Environment Setup): Mention the "kvm" group.
(Invoking guix system): Use "@quotation Note" for the note about KVM;
make it clear that KVM is optional.

* doc/guix.texi (Running the Test Suite): Document 'make check-system'.

* gnu/services/mcron.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* gnu/tests/base.scm (%mcron-os, %test-mcron): New variables.
(run-mcron-test): New procedure.
* doc/guix.texi (Scheduled Job Execution): New node.

* gnu/services/desktop.scm (bluetooth-shepherd-service)
(bluetooth-service): New Prodecures.
(bluetooth-service-type): New variable.
* doc/guix.text (Desktop Services): Document it.

This makes 'dicod' listen on 'localhost' by default, whereas it was
previously listening on all the interfaces, which is not a good default
security-wise.

* gnu/services/dict.scm (<dicod-configuration>)[interfaces]: New field.
(dicod-configuration-file)[database->text]: New procedure, with code
formerly in 'dicod-configuration->text'.
[dicod-configuration->text]: Rename to...
[configuration->text]: ... this.  Honor 'interfaces'.
* doc/guix.texi (Various Services): Document 'interfaces'.

* doc/guix.texi (Synopses and Descriptions): Add note about marketing
phrases.

* gnu/services/database.scm (<mysql-configuration>): New record type.
(%mysql-accounts, mysql-service-type): New variables.
(mysql-configuration-file, %mysql-activation, mysql-shepherd-services)
(mysql-services): New procedures.
* doc/guix.texi (Database Services): Document it.

* guix/gexp.scm (<local-file>)[select?]: New field.
(true): New procedure.
(%local-file): Add #:select? and honor it.
(local-file): Likewise.
* tests/gexp.scm ("local-file, #:select?"): New test.
* doc/guix.texi (G-Expressions): Adjust accordingly.

Reported by ozzloy on #guix.

* doc/guix.texi (package Reference): Add missing space.
(G-Expressions, Invoking guix build):
(Common Build Options): Fix typos.

* guix/store.scm (write-arg): Remove 'file' case.
(true): New procedure.
(add-to-store): Add #:select? parameter and honor it.  Use hand-coded
stub instead of 'operation'.
(interned-file): Add #:select? parameter and honor it.
* doc/guix.texi (The Store Monad): Adjust 'interned-file' documentation
accordingly.

* guix/packages.scm (expand-input): Use 'struct?' instead of 'origin?'
when matching SOURCE.
(package-source-derivation): Use 'lower-object' instead of
'origin->derivation'.
* tests/packages.scm ("package-source-derivation, local-file"): New
test.
* doc/guix.texi (package Reference): Update 'source' documentation
accordingly.

* doc/guix.tex (Invoking guix import): Mention that the pypi importer
works better with "unzip".
* guix/import/pypi.scm (latest-wheel-release,
wheel-url->extracted-directory): New procedures.
* tests/pypi.scm (("pypi->guix-package, wheels"): New test.

* doc/guix.texi (G-Expressions): The #:recursive? parameter of
'local-file' defaults to #f.

* guix/scripts/publish.scm (show-help, %options): Add --ttl.
(render-narinfo): Add #:ttl and honor it.
(make-request-handler): Add #:narinfo-ttl and honor it.
(run-publish-server): Likewise.
(guix-publish): Honor --ttl, pass it to 'run-publish-server'.

Reported by Kete Foy <kete@ninthfloor.org>.

* doc/guix.texi (Preparing for Installation): Add quotes in
wpa_supplicant example.

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

Suggested by Alex Kost <alezost@gmail.com>.

* doc/guix.texi (Preparing for Installation): Mention 'ip'.

* doc/guix.texi (Preparing for Installation): Add paragraph about
package installation in the installation system.

* doc/guix.texi (Python Packages): Add rule for packages with upstream
  name starting with "py".

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

Suggested by Hartmut Goebel <h.goebel@crazy-compilers.com>.

* doc/guix.texi (Installation): Add paragraph explaining that files live
in two directories.

* doc/guix.texi (Binary Installation): Use pgp.mit.edu instead of
keys.gnupg.net, which seems to be dead.

Regardless of -K, we now also print which output differs.

This makes it easier to investigate the non-determinism, e.g.

  $ nix-build pkgs/stdenv/linux -A stage1.pkgs.zlib --check -K
  error: derivation ‘/nix/store/l54i8wlw22656i4pk05c52ngv9rpl39q-zlib-1.2.8.drv’ may not be deterministic: output ‘/nix/store/11a27shh6n2ivi4a7s964i65ql80cf27-zlib-1.2.8’ differs from ‘/nix/store/11a27shh6n2ivi4a7s964i65ql80cf27-zlib-1.2.8-check’

  $ diffoscope /nix/store/11a27shh6n2ivi4a7s964i65ql80cf27-zlib-1.2.8 /nix/store/11a27shh6n2ivi4a7s964i65ql80cf27-zlib-1.2.8-check
  ...
  ├── lib/libz.a
  │   ├── metadata
  │   │ @@ -1,15 +1,15 @@
  │   │ -rw-r--r-- 30001/30000   3096 Jan 12 15:20 2016 adler32.o
  ...
  │   │ +rw-r--r-- 30001/30000   3096 Jan 12 15:28 2016 adler32.o
  ...

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

Fixes <http://bugs.gnu.org/23605>.

* gnu/services/base.scm (urandom-seed-service): New procedure.
(%random-seed-file, urandom-seed-service-type): New variables.
(%urandom-seed-shepherd-service): New procedure.
(%base-services): Call 'urandom-seed-service'.
* doc/guix.texi (Base Services): Document it.

* doc/guix.texi (Derivations): Add 's' to "contain".

* guix/scripts/size.scm (display-profile): Display WHOLE at then end.
(guix-size): Accept several FILES.
* doc/guix.texi (Invoking guix size): Add example with several items.

* guix/scripts/graph.scm (%derivation-node-type)[convert]: Add
'derivation-path?' and catch-all clauses.
(%reference-node-type)[convert]: Add 'store-path?' and catch-all
clauses.
(assert-package, nodes-from-package): New procedures.
(%package-node-type, %bag-node-type,%bag-with-origins-node-type)
(%bag-emerged-node-type): Add 'convert' field
(guix-graph): Rename 'packages' to 'items' and
allow 'store-path?' arguments.
* guix/graph.scm (<node-type>)[convert]: Adjust comment.
* doc/guix.texi (Invoking guix graph): Document it.

* guix/scripts/lint.scm (package-name->cpe-name): Remove.
(package-vulnerabilities): Honor 'cpe-name' and 'cpe-version'
properties.
* gnu/packages/grub.scm (grub)[properties]: New field.
* gnu/packages/gnuzilla.scm (icecat)[properties]: Add 'cpe-name' and
'cpe-version'.
* doc/guix.texi (Invoking guix lint): Mention 'cpe-name'.

* doc/guix.texi (Base Services): "gpm-service", not "gmp-service-type".

* doc/guix.texi (Binary Installation): Use long OpenPGP key ID.

* gnu/services/networking.scm (connman-service): New procedure.
(connman-service-type, %connman-activation): New variables.
(connman-shepherd-service): New procedure.
* doc/guix.texi (Networking Services): Document it.

Suggested by John Darrington <john@darrington.wattle.id.au>.

* guix/scripts/challenge.scm (guix-challenge): Exit with 2 when MISSING
is not empty.
* doc/guix.texi (Invoking guix challenge): Document it.

* guix/scripts/gc.scm (show-help, %options): Add '--free-space'.
(guix-gc)[ensure-free-space]: New procedure.
Handle '--free-space'.

This follows a convention used by some other GNU packages like Autoconf,
Bison, Coreutils, and Gnulib.

* doc.am: Rename to ...
* doc/local.mk: ... this.
* emacs.am: Rename to ...
* emacs/local.mk: ... this.
* gnu-system.am: Rename to ...
* gnu/local.mk: ... this.
* daemon.am: Rename to ...
* nix/local.mk: ... this.
* Makefile.am: Adapt to them.
* doc/guix.texi (Porting to a New Platform): Adapt documentation.
* guix/config.scm.in (%state-directory, %config-directory): Adapt comments.
* emacs/guix-config.el.in (guix-config-state-directory): Likewise.