* guix/scripts/refresh.scm (maybe-updater, list-updaters): Remove.
(importer-modules): New procedure.
(%updaters): Define using 'fold-module-public-variables'.  Turn into a
promise and adjust users.

* guix/discovery.scm, tests/discovery.scm: New files.
* gnu/packages.scm (scheme-files, file-name->module-name)
(scheme-modules, all-package-modules): Remove.
(fold-packages): Rewrite in terms of 'fold-module-public-variables'.
* gnu/tests.scm: Use (guix discovery).
* Makefile.am (MODULES): Add guix/discovery.scm.
(SCM_TESTS): Add tests/discovery.scm.

* gnu/packages/shells.scm (fish-guix): New variable.

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

* gnu/packages/version-control.scm: Add missing copyright line for commit
db88b5a8.

* gnu/packages/version-control.scm (gitolite)[arguments]: Substitute
'$glshell' with 'gitolite-shell' in ssh-authkeys.

* gnu/packages/emacs.scm (emacs-gnuplot): New variable.

* gnu/packages/gcc.scm (gfortran@7): New variable.

* gnu/packages/tls.scm (libressl): Update to 2.5.4.
[home-page]: Use https.

* gnu/packages/linux.scm (tlp)[arguments]: Add ‘fix-installation’ phase so
the installation no longer aborts half-way, and use ‘zero?’ in the install
phase so this cannot go undetected again.

This avoids collisions with '_' when the latter is used as a 'match'
pattern for instance.  See
<https://lists.gnu.org/archive/html/guix-devel/2017-04/msg00464.html>.

* guix/ui.scm: Rename '_' to 'G_'.
* po/guix/Makevars (XGETTEXT_OPTIONS): Adjust accordingly.
* build-aux/compile-all.scm (warnings): Remove 'format'.
* gnu/packages.scm,
gnu/services.scm,
gnu/services/shepherd.scm,
gnu/system.scm,
gnu/system/shadow.scm,
guix/gnupg.scm,
guix/http-client.scm,
guix/import/cpan.scm,
guix/import/elpa.scm,
guix/import/pypi.scm,
guix/nar.scm,
guix/scripts.scm,
guix/scripts/archive.scm,
guix/scripts/authenticate.scm,
guix/scripts/build.scm,
guix/scripts/challenge.scm,
guix/scripts/container.scm,
guix/scripts/container/exec.scm,
guix/scripts/copy.scm,
guix/scripts/download.scm,
guix/scripts/edit.scm,
guix/scripts/environment.scm,
guix/scripts/gc.scm,
guix/scripts/graph.scm,
guix/scripts/hash.scm,
guix/scripts/import.scm,
guix/scripts/import/cpan.scm,
guix/scripts/import/cran.scm,
guix/scripts/import/crate.scm,
guix/scripts/import/elpa.scm,
guix/scripts/import/gem.scm,
guix/scripts/import/gnu.scm,
guix/scripts/import/hackage.scm,
guix/scripts/import/nix.scm,
guix/scripts/import/pypi.scm,
guix/scripts/import/stackage.scm,
guix/scripts/lint.scm,
guix/scripts/offload.scm,
guix/scripts/pack.scm,
guix/scripts/package.scm,
guix/scripts/perform-download.scm,
guix/scripts/publish.scm,
guix/scripts/pull.scm,
guix/scripts/refresh.scm,
guix/scripts/size.scm,
guix/scripts/substitute.scm,
guix/scripts/system.scm,
guix/ssh.scm,
guix/upstream.scm: Use 'G_' instead of '_'.  Most of this change was
obtained by running: "sed -i -e's/(_ "/(G_ "/g' `find -name \*.scm`".

* gnu/packages/mes.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

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

* gnu/packages/gcc.scm (gcc@7): New variable.

* gnu/packages/connman.scm (connman): Update to 1.34.

* gnu/services/herd.scm (%shepherd-socket-file): Make it an exported
  parameter.
(open-connection): Adapt.

* gnu/packages/gcc.scm (gfortran@6): New variable.

* gnu/packages/imagemagick.scm (imagemagick): Update to 6.9.8-4.

Fixes <https://bugs.gnu.org/26751>.

* gnu/build/file-systems.scm (iso9660-superblock?,
read-iso9660-primary-volume-descriptor, read-iso9660-superblock,
iso9660-superblock-uuid, iso9660-uuid->string,
iso9660-superblock-volume-name): New variables.
(%partition-label-readers): Add iso9660.
(%partition-uuid-readers): Add iso9660.

* guix/licenses.scm (perl-license): New variable.
* gnu/packages/bioinformatics.scm: Change (package-license perl) to perl-license.
* gnu/packages/compression.scm: Same.
* gnu/packages/databases.scm: Same.
* gnu/packages/gd.scm: Same.
* gnu/packages/language.scm: Same.
* gnu/packages/libevent.scm: Same.
* gnu/packages/mail.scm: Same.
* gnu/packages/messaging.scm: Same.
* gnu/packages/ncurses.scm: Same.
* gnu/packages/networking.scm: Same.
* gnu/packages/photo.scm: Same.
* gnu/packages/tcl.scm: Same.
* gnu/packages/tex.scm: Same.
* gnu/packages/tls.scm: Same.
* gnu/packages/web.scm: Same.
* gnu/packages/wm.scm: Same.
* gnu/packages/xml.scm: Same.
* gnu/packages/xorg.scm: Same.
* gnu/packages/zip.scm: Same.

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

* guix/monads.scm (%templates, %template-instances): New variables.
(register-template!, register-template-instance!): New procedures.
(template-directory, define-template): New macro.
(foldm, sequence, anym): Define using 'define-template'.  Avoid replace
ellipses with dots.
(mapm): Likewise, but do not use 'foldm'.
* guix/store.scm: Add 'template-directory' invocation.

This allows us to download from site such as
<https://fusionforge.int-evry.fr> where the server does not recognize
the server name passed via the 'server_name' extension.

* guix/build/download.scm (tls-wrap): Catch 'gnutls-error' around
'handshake'.  Upon ERROR/WARNING-ALERT-RECEIVED, print a message and
call 'handshake'.

* guix/licenses.scm (cecill, cecill-b): New variables.

* gnu/packages/video.scm (youtube-dl): Update to 2017.05.01.

* gnu/packages/linux.scm (hdparm): Update to 9.52.

Fixes <https://bugs.gnu.org/26744>.

* gnu/packages/python.scm (python-mwclient, python2-mwclient): New variables.

Fixes <https://bugs.gnu.org/26743>.

* gnu/packages/python.scm (python-pytest-cov): Update to 2.4.0.

* gnu/packages/video.scm (obs): Update to 18.0.2.

Fixes a regression introduced in
commit 960887b2.

* Makefile.am (MODULES_NOT_COMPILED): New variable.
(nobase_dist_guilemodule_DATA): Add $(MODULES_NOT_COMPILED).
(EXTRA_DIST): Remove gnu/build/svg.scm.
* gnu/local.mk (MODULES_NOT_COMPILED): New variable.

Reported by Chris Marusich <cmmarusich@gmail.com>.

* gnu/local.mk (BOOTSTRAP_GUILE_TARBALLS): New variable.
(DISTCLEANFILES): Define as an alias for 'BOOTSTRAP_GUILE_TARBALLS'.
* Makefile.am (check-system): Depend on $(BOOTSTRAP_GUILE_TARBALLS).

Reported by Maxim Cournoyer <maxim.cournoyer@gmail.com>
at <https://lists.gnu.org/archive/html/guix-devel/2017-04/msg00548.html>.

* guix/scripts/substitute.scm (validate-uri): New procedure.
(guix-substitute): Use it.

* gnu/services/base.scm (nscd-activation): Create /etc/resolv.conf if it
does not exist yet.

* gnu/packages/parallel.scm (parallel): Update to 20170422.

* gnu/packages/ocr.scm (ocrad): Update to 0.26.

* gnu/packages/base.scm (libiconv): Update to 1.15.

* gnu/packages/less.scm (less): Update to 487.

* gnu/packages/acct.scm (acct): Update to 6.6.3.

* gnu/packages/emacs.scm (emms): Update to 4.3.

* guix/scripts/publish.scm (bake-narinfo+nar): Pass #:buffer-size to
'call-with-gzip-output-port'.

* gnu/packages/cups.scm (ghostscript/cups): Use package/inherit.
* gnu/packages/ghostscript.scm (ghostscript/x): Use package/inherit.
(ghostscript/fixed)[replacement]: Override to #f.

* guix/packages.scm (package/inherit): New public macro.

* gnu/packages/gnuzilla.scm (icecat)[source]: Add selected fixes from the
upstream mozilla-esr52 repository.