sys-apps/guix: new package, the GNU Purely Functional Package Manager

Internal data model and command UI is a lot like
one of sys-apps/nix.

Package description mechanism is a bit different
in both surface syntax (guile vs nix expression language)
and evaluation method (compiled versus lazy loaded configs)

guix (as well as nix) is a source-based package manager with
strong support for binary packages. It uses multiple tricks
to make package source dependencies robust:

- guix installs every package into it's own --prefix=.
  Example: /gnu/store/6np03bm99hg7gprcwmzpbpaj00cka8p8-icecat-45.5.1-gnu1
- guix builds packages with PATH (and similar) only including explicitly
  listed depends. This eliminates automagic dependency.
- guix tracks full environment where package was built.
  Once environment changes new package needs to be built.

That's how you install firef^Wicecat just for your current user:

    $ guix package --install icecat

Package-Manager: Portage-2.3.3, Repoman-2.3.1

3 files changed, 62 insertions, 0 deletions

diff --git a/sys-apps/guix/files/guix-0.12.0-AR.patch b/sys-apps/guix/files/guix-0.12.0-AR.patch
new file mode 100644
index 000000000000..c9c91c20734c
--- /dev/null
+++ b/sys-apps/guix/files/guix-0.12.0-AR.patch
@@ -0,0 +1,8 @@
+diff --git a/config-daemon.ac b/config-daemon.ac
+index 056c939..b04deed 100644
+--- a/config-daemon.ac
++++ b/config-daemon.ac
+@@ -7,2 +7,3 @@ dnl C++ environment.  This macro must be used unconditionnaly.
+ AC_PROG_CXX
++AM_PROG_AR
+ AC_LANG([C++])
diff --git a/sys-apps/guix/files/guix-0.12.0-no-json-crate.patch b/sys-apps/guix/files/guix-0.12.0-no-json-crate.patch
new file mode 100644
index 000000000000..57b4308a3a89
--- /dev/null
+++ b/sys-apps/guix/files/guix-0.12.0-no-json-crate.patch
@@ -0,0 +1,38 @@
+commit 6023041346c79f7ac4105bba2552a82019fae840
+Author: David Thompson <davet@gnu.org>
+Date:   Fri Dec 30 14:15:35 2016 -0500
+
+    import: crate: Do not build when guile-json is not available.
+    
+    * Makefile.am (MODULES): Add 'guix/import/crate.scm' and
+    'guix/scripts/import/crate.scm' only when HAVE_GUILE_JSON.
+
+diff --git a/Makefile.am b/Makefile.am
+index 15939af12..97629f26e 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -122,7 +122,6 @@ MODULES =					\
+   guix/import/snix.scm				\
+   guix/import/cabal.scm				\
+   guix/import/cran.scm				\
+-  guix/import/crate.scm				\
+   guix/import/hackage.scm			\
+   guix/import/elpa.scm   			\
+   guix/scripts.scm				\
+@@ -142,7 +141,6 @@ MODULES =					\
+   guix/scripts/lint.scm				\
+   guix/scripts/challenge.scm			\
+   guix/scripts/import/cran.scm			\
+-  guix/scripts/import/crate.scm			\
+   guix/scripts/import/gnu.scm			\
+   guix/scripts/import/nix.scm			\
+   guix/scripts/import/hackage.scm		\
+@@ -162,6 +160,8 @@ if HAVE_GUILE_JSON
+ MODULES +=					\
+   guix/import/github.scm   			\
+   guix/import/json.scm				\
++  guix/import/crate.scm				\
++  guix/scripts/import/crate.scm			\
+   guix/import/pypi.scm				\
+   guix/scripts/import/pypi.scm			\
+   guix/import/cpan.scm				\
diff --git a/sys-apps/guix/files/guix-daemon.initd b/sys-apps/guix/files/guix-daemon.initd
new file mode 100644
index 000000000000..c4f25796c1ab
--- /dev/null
+++ b/sys-apps/guix/files/guix-daemon.initd
@@ -0,0 +1,16 @@
+#!/sbin/openrc-run
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+start() {
+	ebegin "Starting ${SVCNAME}"
+	start-stop-daemon --start --quiet --background --exec /usr/bin/guix-daemon -- --build-users-group=guixbuild
+	eend ${?}
+}
+
+stop() {
+	ebegin "Stopping ${SVCNAME}"
+	start-stop-daemon --stop --quiet --exec /usr/bin/guix-daemon
+	eend ${?}
+}