* gnu/packages/boost.scm (boost): Update to 1.58.0.

* guix/scripts/substitute.scm (display-narinfo-data,
  process-query, process-substitution): New procedures.  Code moved from...
  (guix-substitute): ... here.  Use them.

* guix/scripts/build.scm (%standard-build-options,
  show-build-options-help): Add --substitute-urls=URLS.
  (set-build-options-from-command-line): Honor it.
* guix/store.scm (%default-substitute-urls): Make public.
* doc/guix.texi (Substitutes): Add xref to the client --substitute-urls
  option.
  (Invoking guix build): Document it.
  (Invoking guix-daemon): Add 'daemon-substitute-urls' anchor.

* guix/scripts/substitute.scm (or*): New macro.
  (%cache-url): Honor "untrusted-substitute-urls".
* guix/tests.scm (%test-substitute-urls): New variable.
  (open-connection-for-tests): Use it.
* tests/derivations.scm ("derivation-prerequisites-to-build and substitutes",
  "derivation-prerequisites-to-build and substitutes, non-substitutable
  build", "derivation-prerequisites-to-build and substitutes, local build"):
  Pass it to 'set-build-options'.
* tests/guix-daemon.sh: Likewise.
* tests/store.scm ("substitute query, alternating URLs"): New test.
  ("substitute query", "substitute", "substitute + build-things with output
  path", "substitute, corrupt output hash", "substitute --fallback"): Pass
  #:substitute-urls to 'set-build-options'.

This ensures that switching between different substitute servers doesn't lead
to a polluted narinfo cache.

* guix/scripts/substitute.scm (narinfo-cache-file): Add 'cache-url'
  parameter.  Add the base32 of CACHE-URL as a sub-directory under
  %NARINFO-CACHE-DIRECTORY.  Update callers.
  (cached-narinfo): Likewise.  Call 'mkdir-p' on the dirname of the cache
  file.  Update callers.
  (remove-expired-cached-narinfos): Add 'directory' parameter and use it
  instead of %NARINFO-CACHE-DIRECTORY.
  (narinfo-cache-directories): New procedure.
  (maybe-remove-expired-cached-narinfo): Call 'remove-expired-cached-narinfos'
  for each item returned by 'narinfo-cache-directories'.

* guix/scripts/substitute.scm (<cache>): Rename to...
  (<cache-info>): ... this.
  (open-cache): Rename to...
  (download-cache-info): ... this.  Return a <cache-info> or #f.
  (open-cache*): Remove.
  (cache-narinfo!): Take a URL instead of a <cache> as the first parameter.
  (fetch-narinfos): Likewise.  Call 'download-cache-info'.  Remove use of
  'force'.
  (guix-substitute): Replace calls to 'open-cache*' with %CACHE-URL.

* guix/scripts/substitute.scm (guix-substitute): Remove unneeded (if cache
  ...) forms since CACHE is always true (it's a promise.)

* gnu/system/file-systems.scm (%container-file-systems): Fix typo in a
  comment.

* guix/scripts/lint.scm (guix): Remove duplicated lines for using
  'srfi-34' and 'srfi-35' modules.  These lines were introduced twice by
  commits b210b35d and 002c57c6.

* gnu/packages/gnome.scm (rhythmbox): New variable.

* gnu/packages/gcc.scm (make-libstdc++-doc): New procedure.
  (libstdc++-doc-4.9, libstdc++-doc-5.1): New variables.

* gnu/package/skarnet.scm (execline): New variable.

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

* gnu/package/skarnet.scm (skalibs): New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

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

* gnu/packages/pumpio.scm (pumpa): Update to 0.9.1.  Change URL.

Signed-off-by: Mathieu Lirzin <mthl@openmailbox.org>

* gnu/packages/polkit.scm (polkit): Update to 0.113.

* gnu/packages/ssh.scm (openssh): Update to 6.9p1.
  [source]: Use http mirrors.  Add mirror from Erlangen.

This is a followup to commit d43002f6.

* gnu/system/install.scm (installation-os)[packages]: Refer to IPROUTE instead
  of IPROUTE2.

* gnu/packages/tls.scm (openssl): Update to 1.0.2d.

* gnu/packages/ntp.scm (ntp): Update to 4.2.8p3.
  [source]: Add snippet to remove bundled copy of libevent.
  [inputs]: Add libevent.
  [arguments]: Add 'disable-network-test' phase.

Co-authored-by: Federico Beffa <beffa@fbengineering.ch&gt;.>

* emacs/guix-emacs.el (guix-emacs-find-autoloads-in-directory,
  guix-emacs-subdirs): New functions.
  (guix-emacs-find-autoloads): Search for autoloads in "guix.d"
  subdirectories.
  (guix-emacs-load-autoloads): Add subdirectories to 'load-path'.
* emacs/guix-init.el.in: Do not add guix emacs directory to 'load-path'
  because it will be done by 'guix-emacs-load-autoloads'.  Move
  requiring 'guix-emacs' from the top-level to a clause for checking for
  'guix-package-enable-at-startup'.

Fixes <http://bugs.gnu.org/21019>.
Reported by <info@danieleparisi.me>.

* gnu/system/install.scm (installation-os)[packages]: Add IPROUTE2.

* gnu/packages/gnome.scm (gnome-terminal): Move dconf from inputs to
  propagated-inputs.

* tests/syscalls.scm ("clone", "setns", "pivot-root"): Skip
  unless (user-namespace (getpid)) exists.

This reverts commit 16de69c9.

This bug was introduced in commit 85c3127f.

Thanks to Christopher Webber for reporting it.

* gnu/syste/linux-initrd.scm (base-initrd): Include (guix build syscalls)
  module in derivation.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Likewise.

* gnu/packages/gnome.scm (brasero): Update to 3.12.1.
  [inputs]: Add gobject-introspection, nettle, and totem-pl-parser.

* gnu/packages/package-management.scm (guix-devel): Update to dd911410.
  [arguments]: Use 'modify-phases'.  Add 'disable-container-tests' phase.

This reverts commit bfabd1fb.

* gnu/packages/package-management.scm (guix-devel): Update to 9f04196d.

This reverts commit 552b98a2.

* gnu/packages/gnupg.scm (libgpg-error): Update to 1.19.

* gnu/packages/gnupg.scm (pinentry): Update to 1.9.5. Add input libassuan.

* gnu/packages/gnupg.scm (libksba): Update to 1.3.3.

* gnu/packages/gnupg.scm (gpgme): Update to 1.5.5.

* gnu/packages/gnupg.scm (npth): Update to 1.2.

* gnu/packages/gnupg.scm (pius): Update to 2.1.1.

* gnu/packages/gnupg.scm (libassuan): Update to 2.2.1.

* gnu/packages/mpd.scm (ncmpc): Update to 0.24.

* gnu/packages/mpd.scm (ncmpcpp): Update to 0.6.5.

* gnu/packages/mpd.scm (mpd-mpc): Update to 0.27.