[PATCH] gnu: kdbusaddons: Embed path to kdeinit5, avoid dependency cycles.

[Thomas Danckaert]

Hi,

kdbusaddons is responsible for (re-)starting kdeinit5 (a daemon that 
speeds up startup of KDE applications by forking itself into a new 
process) when it is not running.  However, kdbusaddons is also a 
build dependency of kinit.

This patch adds a kinit-bootstrap package, makes it  an input of 
kdbusaddons, and embeds the store path of the kdeinit5 executable (an 
output of kinit-bootstrap) in the kdbusaddons source.  Without this 
patch, applications using kdbusaddons will always need a PATH 
environment variable in order to find kdeinit5.

Because kinit depends on kdbusaddons via a number of intermediate 
packages, I had to add kdbusaddons-bootstrap and a few other extra 
packages to avoid dependency cycles.  This patch would trigger a 
build of around ~30 packages.

A remaining issue with kdeinit is, that it needs to run in an 
environment with all the required environment variables (such as 
QT_PLUGIN_PATH and QML2_IMPORT_PATH) for all possible KDE 
applications it has to start (and any libraries they depend on), in 
order to find dependencies at runtime, such as plugins and Qml 
modules.  If a user wants to run a KDE application which relies on 
kdeinit, but kdeinit is already running without all the required 
environment vars, the application will not find all the plugins or 
Qml modules it needs.  (In a conventional system, kde applications 
just need to know one central directory where they will find all KDE 
plugins present on the system)

I don't know what would be a good solution.  A “kde-master” package, 
which has references to all packaged KDE applications (and some 
libraries which provide plugins) as inputs, and just adds the 
required paths to the user's profile (not very modular, but it could 
work)? Could a kdeinit service could help with this in GuixSD 
(haven't really looked at services yet)?

Thomas

>From ba729cd9a2bbbc98bd308702ded837cae5980281 Mon Sep 17 00:00:00 2001
From: Thomas Danckaert <address@hidden>
Date: Tue, 6 Dec 2016 14:55:39 +0100
Subject: [PATCH] gnu: kdbusaddons: Embed path to kdeinit5, avoid dependency
 cycles.

kdbusaddons needs to know the location of the kdeinit5 executable,
provided by kinit. kinit depends on kdbusaddons, so we add bootstrap
versions of all packages in the dependency chain from kinit to
kdbusaddons to avoid cyclic dependencies.

* gnu/packages/kde-frameworks.scm (kinit-bootstrap,
  kdbusaddons-bootstrap, kbookmarks-bootstrap, kglobalaccel-bootstrap,
  kio-bootstrap, kservice-bootstrap, ktextwidgets-bootstrap,
  kwallet-bootstrap, kxmlgui-bootstrap): New variables.
  (kdbusaddons)[inputs]: Add kinit-bootstrap.
  [source,arguments]: Add patch and substitution to embed
  kinit-bootstrap's store path in the code.
* gnu/packages/patches/kdbusaddons-kinit-path.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
---
 gnu/local.mk                                      |  1 +
 gnu/packages/kde-frameworks.scm                   | 68 ++++++++++++++++++++++-
 gnu/packages/patches/kdbusaddons-kinit-path.patch | 15 +++++
 3 files changed, 81 insertions(+), 3 deletions(-)
 create mode 100644 gnu/packages/patches/kdbusaddons-kinit-path.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index 55dee48..b42258e 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -639,6 +639,7 @@ dist_patch_DATA =                                           
\
   %D%/packages/patches/isl-0.11.1-aarch64-support.patch        \
   %D%/packages/patches/jbig2dec-ignore-testtest.patch          \
   %D%/packages/patches/jq-CVE-2015-8863.patch                  \
+  %D%/packages/patches/kdbusaddons-kinit-path.patch            \
   %D%/packages/patches/khmer-use-libraries.patch                \
   %D%/packages/patches/kmod-module-directory.patch             \
   %D%/packages/patches/kobodeluxe-paths.patch                  \
diff --git a/gnu/packages/kde-frameworks.scm b/gnu/packages/kde-frameworks.scm
index 8b84133..ea53e04 100644
--- a/gnu/packages/kde-frameworks.scm
+++ b/gnu/packages/kde-frameworks.scm
@@ -25,6 +25,7 @@
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix packages)
   #:use-module (guix utils)
+  #:use-module (gnu packages)
   #:use-module (gnu packages acl)
   #:use-module (gnu packages admin)
   #:use-module (gnu packages attr)
@@ -50,7 +51,8 @@
   #:use-module (gnu packages version-control)
   #:use-module (gnu packages web)
   #:use-module (gnu packages xml)
-  #:use-module (gnu packages xorg))
+  #:use-module (gnu packages xorg)
+  #:use-module (srfi srfi-1))
 
 (define-public extra-cmake-modules
   (package
@@ -516,7 +518,8 @@ many more.")
                     name "-" version ".tar.xz"))
               (sha256
                (base32
-                "07mzb1xr8wyiid25p8kg6mjp6vq8ngvv1ikhq75zvd2cbax530c8"))))
+                "07mzb1xr8wyiid25p8kg6mjp6vq8ngvv1ikhq75zvd2cbax530c8"))
+              (patches (search-patches "kdbusaddons-kinit-path.patch"))))
     (build-system cmake-build-system)
     (native-inputs
      `(("extra-cmake-modules" ,extra-cmake-modules)
@@ -524,10 +527,18 @@ many more.")
        ("qttools" ,qttools)))
     (inputs
      `(("qtbase" ,qtbase)
-       ("qtx11extras" ,qtx11extras)))
+       ("qtx11extras" ,qtx11extras)
+       ("kinit" ,kinit-bootstrap))) ;; kinit-bootstrap: kinit package which 
does not depend on kdbusaddons.
     (arguments
      `(#:phases
        (modify-phases %standard-phases
+         (add-before
+          'configure 'patch-source
+          (lambda* (#:key inputs #:allow-other-keys)
+            ;; look for the kdeinit5 executable in kinit's store path,
+            ;; instead of the current application's directory:
+            (substitute* "src/kdeinitinterface.cpp"
+              (("@SUBSTITUTEME@") (assoc-ref inputs "kinit")))))
          (replace 'check
            (lambda _
              (setenv "DBUS_FATAL_WARNINGS" "0")
@@ -2866,3 +2877,54 @@ setUrl, setUserAgent and call.")
 script engines.")
     ;; dual licensed
     (license (list license:gpl2+ license:lgpl2.1+))))
+
+;; This version of kdbusaddons does not use kinit as an input, and is used to
+;; build kinit-bootstrap, as well as bootstrap versions of all kinit
+;; dependencies which also rely on kdbusaddons.
+(define kdbusaddons-bootstrap
+  (package
+    (inherit kdbusaddons)
+    (source (origin
+              (inherit (package-source kdbusaddons))
+              (patches '())))
+    (inputs (alist-delete "kinit" (package-inputs kdbusaddons)))
+    (arguments
+     (substitute-keyword-arguments (package-arguments kdbusaddons)
+       ((#:phases phases)
+        `(modify-phases ,phases
+           (delete 'patch-source)))))))
+
+(define kservice-bootstrap
+  ((package-input-rewriting `((,kdbusaddons . ,kdbusaddons-bootstrap))) 
kservice))
+
+(define ktextwidgets-bootstrap
+  ((package-input-rewriting `((,kservice . ,kservice-bootstrap))) 
ktextwidgets))
+
+(define kwallet-bootstrap
+  ((package-input-rewriting `((,kdbusaddons . ,kdbusaddons-bootstrap)
+                              (,kservice . ,kservice-bootstrap))) kwallet))
+
+(define kglobalaccel-bootstrap
+  ((package-input-rewriting `((,kdbusaddons . ,kdbusaddons-bootstrap)
+                               (,kservice . ,kservice-bootstrap))) 
kglobalaccel))
+
+(define kxmlgui-bootstrap
+  ((package-input-rewriting `((,kglobalaccel . ,kglobalaccel-bootstrap)
+                              (,ktextwidgets . ,ktextwidgets-bootstrap))) 
kxmlgui))
+
+(define kbookmarks-bootstrap
+  ((package-input-rewriting `((,kxmlgui . ,kxmlgui-bootstrap))) kbookmarks))
+
+(define kio-bootstrap
+  ((package-input-rewriting `((,kservice . ,kservice-bootstrap)
+                              (,kxmlgui . ,kxmlgui-bootstrap)
+                              (,kbookmarks . ,kbookmarks-bootstrap)
+                              (,kdbusaddons . ,kdbusaddons-bootstrap)
+                              (,kwallet . ,kwallet-bootstrap)
+                              (,ktextwidgets . ,ktextwidgets-bootstrap))) kio))
+
+(define kinit-bootstrap
+  ((package-input-rewriting `((,kio . ,kio-bootstrap)
+                              (,kservice . ,kservice-bootstrap)
+                              (,kbookmarks . ,kbookmarks-bootstrap)
+                              (,kxmlgui . ,kxmlgui-bootstrap))) kinit))
diff --git a/gnu/packages/patches/kdbusaddons-kinit-path.patch 
b/gnu/packages/patches/kdbusaddons-kinit-path.patch
new file mode 100644
index 0000000..97c7319
--- /dev/null
+++ b/gnu/packages/patches/kdbusaddons-kinit-path.patch
@@ -0,0 +1,15 @@
+Add placeholder for kinit's store path.
+
+diff --git a/src/kdeinitinterface.cpp b/src/kdeinitinterface.cpp
+index 22fa5e5..3d40937 100644
+--- a/src/kdeinitinterface.cpp
++++ b/src/kdeinitinterface.cpp
+@@ -52,7 +52,7 @@ void KDEInitInterface::ensureKdeinitRunning()
+     // If not found in system paths, search other paths
+     if (srv.isEmpty()) {
+         const QStringList searchPaths = QStringList()
+-            << QCoreApplication::applicationDirPath() // then look where our 
application binary is located
++            << QString::fromUtf8("@SUBSTITUTEME@/bin") // using 
QStringLiteral would be more efficient, but breaks guix store reference 
detection.
+             << QLibraryInfo::location(QLibraryInfo::BinariesPath); // look 
where exec path is (can be set in qt.conf)
+         srv = QStandardPaths::findExecutable(QStringLiteral("kdeinit5"), 
searchPaths);
+         if (srv.isEmpty()) {
-- 
2.7.4