* 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'.

* configure.ac: Error out when (git) is missing.
* doc/guix.texi (Requirements): Mention Guile-Git.
* Makefile.am (MODULES): Add guix/git.scm unconditionally.

* gnu/packages/regex.scm (re2): Update to 2017-08-01.

* gnu/packages/xdisorg.scm (maim): Update to 5.4.66.

* gnu/packages/xdisorg.scm (slop): Update to 7.3.48.

* gnu/packages/version-control.scm (git): Update to 2.13.4.

* gnu/packages/statistics.scm (r-foreign):  Update hash.  The only difference
  in the tarball is the metadata.  The contents are identical.

* gnu/packages/statistics.scm (r-foreign): Remove duplicate recipe.

* guix/graph.scm (export-graph): Pass the node to the emit functions, instead
  of the node's label.

This is a follow up to 6ddf97f8

* guix/scripts/package.scm (%options) <"-u">: Only check for a flag when
there is an ARG after '-u'.

* gnu/packages/web.scm (rapidjson): Update to 1.1.0.
[source]: Remove snippet.

* gnu/packages/networking.scm (pidentd): New variable.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

* gnu/packages/games.scm (hyperrogue): Update to 10.0e.
[arguments]: Adjust accordingly.

* gnu/packages/bioinformatics.scm (metabat)[supported-systems]: New field.

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

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

* gnu/packages/emacs.scm (emacs-yasnippet): Upgrade to 0.12.0.
[source]: Remove an uninstalled directory from yas-snippet-dirs.

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

* gnu/packages/ssh.scm (guile-ssh): Update to 0.11.2.
[source]: Remove 'patches', 'modules', and 'snippet'.
* gnu/packages/patches/guile-ssh-channel-finalization.patch,
gnu/packages/patches/guile-ssh-double-free.patch,
gnu/packages/patches/guile-ssh-rexec-bug.patch: Remove.
* gnu/local.mk (dist_patch_DATA): Remove them.

* gnu/packages/guile.scm (artanis): Unbundled guile-json and version
according to documentation.

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

* guix/scripts/lint.scm (report-formatting-issues)[last-line]: Remove.
[sexp-last-line]: New procedure.
Use it.

* gnu/packages/python.scm (python-pbr-minimal): Update to 3.0.1
[source]: Update hash and remove patch.
* gnu/packages/patches/python-pbr-fix-man-page-support.patch: Remove file.
* gnu/local.mk (dist_patch_DATA): Remove it.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

* gnu/packages/version-control.scm (libgit2)[arguments]: Enable '-DUSE_SHA1DC'
in #:configure-flags.

* gnu/packages/ruby.scm (ruby-bio-commandeer): Update to 0.2.0.

* gnu/packages/gnunet.scm (libmicrohttpd): Update to 0.9.55.
[arguments]: Add 'add-missing-LDFLAGS' phase.

Fixes <https://bugs.gnu.org/27820>.
Reported by Hartmut Goebel <h.goebel@crazy-compilers.com>.

* guix/scripts/package.scm (%options) <"-u">: Emit a warning when ARG
starts with "-".

* gnu/packages/xorg.scm (xf86-video-intel): Update to 2100efa.
Introduce 'revision' variable.

* gnu/packages/guile.scm (guile-bytestructures)[arguments]: Install .go
files to OBJECT-DIR, defined as OUT/lib/guile/X.Y/site-ccache.

* gnu/packages/tor.scm (tor)[arguments]: Remove '--enable-expensive-hardening' option.

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

* gnu/packages/erlang.scm (erlang): Update to 20.0.

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

Suggested by Mark H Weaver.

* gnu/packages/gnome.scm (network-manager)[inputs]: Add NEWT.

Reported by Mark H Weaver.

* gnu/packages/guile.scm (guile-git)[arguments]: Add 'skip-tests' phase
unless on x86_64-linux.

* gnu/packages/version-control.scm (libgit2)[outputs]: New field.

* gnu/packages/version-control.scm (libgit2): Update to 0.26.0.  Remove
"libgit2-use-after-free.patch".
* gnu/packages/patches/libgit2-use-after-free.patch: Remove.
* gnu/local.mk (dist_patch_DATA): Remove it.

* gnu/packages/enlightenment.scm (efl)[inputs]: Add wayland-protocols.
Move mesa ...
[propagated-inputs]: ... to here. Add libinput, libxkbcommon, wayland.
[arguments]: Add flags to enable wayland, elput and drm.

* gnu/packages/gstreamer.scm (gst-plugins-good)[arguments]: Change the
list of tests to disable during 'disable-failing-tests phase.

* gnu/services/networking.scm (%ntp-servers): Use *.guix.pool.ntp.org.

* gnu/packages/autotools.scm (automake/latest): New variable.

* gnu/packages/package-management.scm (guix)[arguments]: Add (srfi
srfi-26) to #:modules.  Introduce 'gopath', distinct from 'path'.

* gnu/packages/package-management.scm (guix): Update to 228a3982.

* guix/git-download.scm (git-predicate): Remove call to
'canonicalize-path' since this could lead to discrepancies.  For
instance it broke 'make update-guix-package' since it passes a
non-canonical directory name.

* gnu/services/ssh.scm (extend-openssh-authorized-keys): New procedure.
(openssh-service-type)[compose, extend]: New fields.
* doc/guix.texi (Networking Services): Document the extension.