xsession: Make xsession script testable.

A few minor related changes are included. E.g. we actually want to pass
along blank lines, so remove that check (which didn't work anyways as \n
was still present).

We replace that with a simple filter in the template installation
process to allow there to be source lines in the base template that
don't get passed to the installed result. This allows for shell script
that prevents running the full command suite in the base without
affecting the installed script.

It is required to be able to actually run the base script as the "set
-u" check for unset variables doesn't work when "set -n" (syntax check)
is in use. These set commands can be passed directly to /bin/sh to have
them in effect when the script starts (and are both part of POSIX and
seem to work even with busybox sh).

Additionally, the path_add function needs to actually check for unset
variables now. Luckily there is existing Bourne shell syntax for that.

The observant reviewer will note that the testsuite does not currently
pass because there is a mispeled lib_suffix in the base, that will be
fixed in the next commit.

kdesrc-build

@@ -6457,7 +6457,8 @@ sub installTemplatedFile
             unlink($destinationPath);
         }
 
-        next unless $line; # Skip blank lines
+        # Some lines should only be present in the source as they aid with testing.
+        next if $line =~ /kdesrc-build: filter/;
 
         $line =~
             s {

kdesrc-build-test.pl

@@ -516,9 +516,16 @@ SKIP: {
     like ($newQMakePossibility, qr/^qmake/, 'qmake looks like an executable even in scalar context.');
 }
 
+is(system('/bin/sh', '-n', "$RealBin/sample-xsession.sh"), 0, 'xsession  pre-install syntax check');
+
+$ENV{KDESRC_BUILD_TESTING} = 1; # Tell sample-xsession.sh not to run.
+is(system('/bin/sh', '-u', "$RealBin/sample-xsession.sh"), 0, 'xsession unset variable check');
+
 # Ensure this function can run without throwing exception.
 ok(installTemplatedFile("$RealBin/sample-xsession.sh", "$testSourceDirName/xsession.sh", $ctx) || 1,
-    'installing-template');
+    'xsession template installation');
+
+is(system('/bin/sh', '-n', "$testSourceDirName/xsession.sh"), 0, 'xsession post-install syntax check');
 
 done_testing();
 ### TESTS GO ABOVE THIS LINE

sample-xsession.sh

@@ -14,12 +14,19 @@
 
 # === User-modifiable variables. Should be set automatically by kdesrc-build.
 
+# kdesrc-build: filter | The KDESRC_BUILD_TESTING stuff is to allow the script to
+# kdesrc-build: filter | be executable by testsuite. It is filtered from destination.
+if ! test -n "$KDESRC_BUILD_TESTING"; then # kdesrc-build: filter
 # Where KDE libraries and applications are installed to.
 kde_prefix="<% kdedir %>"  # E.g. "$HOME/kde-4"
 
 # Where Qt is installed to. If using the system Qt, leave blank or set to
 # 'auto' and this script will try to auto-detect.
 qt_prefix="<% qtdir %>"    # E.g. "$HOME/qt4" or "/usr" on many systems.
+else # kdesrc-build: filter
+kde_prefix="$HOME/kde"     # kdesrc-build: filter
+qt_prefix="$HOME/qt4"      # kdesrc-build: filter
+fi # kdesrc-build: filter
 
 # Directory to use for KDE configuration and other user customizations.
 KDEHOME="$HOME/.kde4-self" # Or perhaps "$HOME/.kde-selfmade", etc.
@@ -67,7 +74,7 @@ fi
 # Can't use function keyword in Busybox-sh
 path_add()
 {
-    eval curVal=\$'{'$1'}'
+    eval curVal=\$'{'$1'-}'
 
     if [ -n "$curVal" ]; then
         eval "$1"="$2:$curVal";
@@ -130,6 +137,7 @@ export XDG_CONFIG_DIRS
 export MANPATH
 export KDEHOME
 
+if ! test -n "$KDESRC_BUILD_TESTING"; then # kdesrc-build: filter
 # Read in user-specific customizations
 if test -f "$HOME/.xsession-local"; then
     source "$HOME/.xsession-local"
@@ -148,3 +156,4 @@ fi
 if test -f "$HOME/.xsession-logout"; then
     source "$HOME/.xsession-logout"
 fi
+fi # kdesrc-build: filter