discovery: Recurse into directories pointed to by a symlink.

Reported by Christopher Baines <mail@cbaines.net>
and Alex Kost <alezost@gmail.com>
at <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00290.html>.

* guix/discovery.scm (scheme-files): When ENTRY is a symlink that
doesn't end in '.scm', call 'stat' and recurse if it points to a
directory.
* tests/discovery.scm ("scheme-modules recurses in symlinks to
directories"): New test.

copy: Default to port 22.

Failing to do that, "%p" would be "0" when using "ProxyCommand"
in ~/.ssh/config.

* guix/scripts/copy.scm (send-to-remote-host): Default to port 22.
(retrieve-from-remote-host): Likewise.

packages: Mark 'replacement' as an "innate" field.

Suggested by Mark H Weaver
at <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00355.html>.

* guix/packages.scm (<package>)[replacement]: Mark as "innate".
* gnu/packages/base.scm (glibc-2.25-patched, glibc-2.24)
(glibc-2.23, glibc-2.22, glibc-2.21, glibc-locales): Remove
'replacement' field, which was set to #f.
* gnu/packages/commencement.scm (perl-boot0): Likewise.
* gnu/packages/fontutils.scm (graphite2/fixed): Likewise.
* gnu/packages/ghostscript.scm (ghostscript/fixed): Likewise.
* gnu/packages/gnupg.scm (libgcrypt-1.7.8): Likewise.
* gnu/packages/guile.scm (guile-2.0/fixed, guile-2.2): Likewise.
* gnu/packages/icu4c.scm (icu4c/fixed): Likewise.
* gnu/packages/image.scm (libpng-apng): Likewise.
* gnu/packages/make-bootstrap.scm (%guile-static): Likewise.
* gnu/packages/pcre.scm (pcre/fixed): Likewise.
* gnu/packages/perl.scm (perl/fixed): Likewise.
* gnu/packages/ruby.scm (ruby-2.3, ruby-2.2, ruby-2.1)
(ruby-1.8): Likewise.
* gnu/packages/tls.scm (gnutls-3.5.13, gnutls/guile-2.2): Likewise.
* gnu/packages/xml.scm (expat-2.2.1): Likewise.

gnu: wine: Add stable release.

* gnu/packages/wine.scm (wine): Refer to stable release instead of development
  one.
(wine-next): New variable.

profiles: xdg-desktop-database: Run the hook when GLib is referenced.

This will pull the latest 'desktop-file-utils' package into the profile
closure, as the 'xdg-mime-database' hook already does.

* guix/profiles.scm (xdg-desktop-database): Run the hook when 'glib' is
referenced.

doc: Update formatting.

* doc/guix.texi (disk-image): Update formatting of "ext4".

Follow-up to 3f4d8a7f66060e93a247797a9bbd2fcbee6922a3.

gnu: Add emacs-emamux.

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

Signed-off-by: 宋文武 <iyzsong@member.fsf.org>

build: Add (gnu build file-systems) import.

* gnu/build/vm.scm: Add (gnu build file-systems) import.

guix system: Add "--file-system-type" option.

* guix/scripts/system.scm (process-action): Pass file-system-type to ...
(perform-action): ... here.  Add new keyword argument.  Pass new value to ...
(system-derivation-for-action): ... here.  Add new keyword argument.
Pass new value to system-disk-image.
* doc/guix.texi (disk-image): Document new option.

gnu: gcr: Enable working tests.

* gnu/packages/patches/gcr-disable-failing-tests.patch,
gnu/packages/patches/gcr-fix-collection-tests-to-work-with-gpg-21.patch:
New files.
* gnu/local.mk (dist_patch_DATA): Add patches.
* gnu/packages/gnome.scm (gcr)[source]: Use patches.
[arguments]: Enable tests.

build: Clarify error message when make-iso9660-image fails.

* gnu/build/vm.scm (make-iso9660-image): Clarify error message.

build: Allow specifying volume-uuid with make-iso9660-image.

* gnu/build/file-systems.scm (iso9660-uuid->string): Export.
* gnu/build/vm.scm (make-iso9660-image): Add volume-uuid.

gnu: xfce: Propagate search paths of 'xfce4-panel'.

* gnu/packages/xfce.scm (xfce)[native-search-paths]: New field.

gnu: Add emacs-sparql-mode.

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

build: Add iso9660 system image generator.

* build-aux/hydra/gnu-system.scm (qemu-jobs): Add 'iso9660-image .
* gnu/build/vm.scm (make-iso9660-image): New variable.  Export it.
* gnu/system/vm.scm (iso9660-image): New variable.  Use make-iso9660-image.
(system-disk-image): Use iso9660-image.

gnu: Switch guile-cairo and dependents to Guile 2.2 again.

Fixes <https://bugs.gnu.org/27551>.
Reported by Leo Famulari <leo@famulari.name>.

This reinstates the following commits:

  e3ddb1e83 * gnu: guile-cairo: Switch to Guile 2.2.
  ae5c6ef39 * gnu: guile-gnome: Update to 2.16.5.
  0fd8013fc * gnu: guile-rsvg: Update to commit 05c6a2fd.
  66b9183c4 * gnu: guile-lib: Switch to Guile 2.2.

and adds the following changes:

* gnu/bootloader/grub.scm (svg->png): Add 'package->derivation' call for
GUILE-2.2.  Pass #:guile-for-build to 'gexp->derivation'.
* gnu/build/svg.scm (svg->png): Add 'em' and 'ex' to the 'let-values'
form to account for all the values returned by
'rsvg-handle-get-dimensions', which Guile 2.2 does not truncate.

gnu: Add toxic.

* gnu/packages/messaging.scm (toxic): New variable.

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

linux-initrd: Add isofs if necessary.

* gnu/system/linux-initrd.scm (base-initrd): Add isofs.

gnu: emacs-guix: Update to 0.3.2.

* gnu/packages/emacs.scm (emacs-guix): Update to 0.3.2.
[arguments]: Add '--with-guix-site-ccache-dir' configure flag, as Guix
installs its .go files separately nowadays.

file-systems: iso9660-uuid->string: Use "-" as separator in the result.

* gnu/build/file-systems.scm (iso9660-uuid->string): Use "-" as separator
in the result.