Require a configuration file.

Right now kdesrc-build will default to kdesrc-buildrc-sample if no
configuration file is present, but that won't be appropriate now that
KF5 is out. Make the user make a choice instead.

The various READMEs and help texts would probably need to be updated to
match, if anyone wants to help. ;)

kdesrc-buildrc-kf5-sample

@@ -0,0 +1,36 @@
+# This is a sample kdesrc-build configuration file appropriate for KDE
+# Frameworks 5-based build environments.
+#
+# See the kdesrc-buildrc-sample for explanations of what the options do, or
+# view the manpage or kdesrc-build documentation at
+# http://kdesrc-build.kde.org/documentation/
+global
+    branch-group kf5-qt5
+    kdedir ~/kde-5 # Where to install KF5-based software
+    qtdir /usr     # Where to find Qt5
+
+    # Where to download source code. By default the build directory and
+    # logs will be kept under this directory as well.
+    source-dir ~/kdesrc
+end global
+
+# Instead of specifying modules here, the current best practice is to refer to
+# KF5 module lists maintained with kdesrc-build by the KF5 developers. As new
+# modules are added or modified, the kdesrc-build KF5 module list is altered to
+# suit, and when you update kdesrc-build you will automatically pick up the
+# needed changes.
+
+# NOTE: You MUST change the path below to include the actual path to your
+# kdesrc-build installation.
+include /path/to/kdesrc-build/kf5-qt5-build-include
+
+# If you wish to maintain the module list yourself that is possible, simply
+# look at the files pointed to above and use the "module-set" declarations that
+# they use, with your own changes.
+
+# It is possible to change the options for modules loaded from the file
+# included above (since it's not possible to add a module that's already been
+# included), e.g.
+options kcoreaddons
+#    make-options -j4
+end options

modules/ksb/BuildContext.pm

@@ -529,8 +529,6 @@ sub setRcFile
 #
 # If unable to find or open the rc file an exception is raised. Empty rc
 # files are supported however.
-#
-# TODO: Support a fallback default rc file.
 sub loadRcFile
 {
     my $self = shift;
@@ -566,21 +564,39 @@ EOM
         croak_runtime("Missing $failedFile");
     }
 
-    # Set rcfile to something so the user knows what file to edit to
-    # get what they want to work.
+    # If no configuration but no --rc-file option was used, warn the user
+    # and fail, as there are too many possible modes of using kdesrc-build
+    # for kdesrc-buildrc-sample to be appropriate.
+
+    error (<<EOM);
+b[No configuration file is present.]
+
+kdesrc-build requires a configuration file to select which KDE software modules
+to build, what options to build them with, the path to install to, etc.
+
+kdesrc-build looks for its configuration in the file `kdesrc-buildrc' in
+whatever directory kdesrc-build is run from.
 
-    # Our default is to use a kdesrc-buildrc-sample if present in the same
-    # directory.
-    my $basePath = dirname($0);
-    my $sampleConfigFile = "$basePath/kdesrc-buildrc-sample";
-    open ($fh, '<', $sampleConfigFile)
-        or croak_runtime("No configuration available");
+If no such file exists, kdesrc-build tries to use `~/.kdesrc-buildrc' (note the
+leading `.')
 
-    $self->{rcFile} = $sampleConfigFile;
-    $self->{rcFile} =~ s,^$ENV{HOME}/,~/,;
-    note (" * Using included sample configuration.");
+A sample configuration suitable for KDE 4 software is included at the file
+`kdesrc-buildrc-sample' which can be copied to the correct location and then
+edited.
 
-    return $fh;
+KDE Frameworks 5 users can use the `kdesrc-buildrc-kf5-sample' file which can
+be copied to the correct location and then edited.
+
+In either case b[once the configuration file is setup to your liking], you
+should run:
+b[kdesrc-build --metadata-only]
+
+to download needed information about the KDE source repositories and then:
+b[kdesrc-build --pretend]
+
+to preview what kdesrc-build will do.
+EOM
+    croak_runtime("No configuration available");
 }
 
 # Returns the base directory that holds the configuration file. This is