build: Add an 'iconsdir' option.

[Apteryks]

This fixes the icon not being found for XDG systems such as GNU/Linux, partially addressing #180.

It should be applied the following patch to the vdrift-data SVN repo:

Index: vdrift-data/SConscript
===================================================================
--- vdrift-data/SConscript	(revision 1460)
+++ vdrift-data/SConscript	(working copy)
@@ -10,6 +10,7 @@
 #---------#
 src = []
 
+# Install every single file to the data directory.
 for root, dirs, files in os.walk("."):
   if root.find('.svn') == -1:
     for file in [f for f in files if not f.endswith('~')]:
@@ -40,3 +41,6 @@
     env.MoBuild(mo_file, po_file)
     install = env.InstallAs(os.path.join(env.subst('$locale_directory'), mo_tgt_file), mo_file)
     env.Alias("install", install)
+
+# Also copy the icons to a suitable location for the system.
+SConscript('textures/icons/SConscript')
Index: vdrift-data/textures/icons/SConscript
===================================================================
--- vdrift-data/textures/icons/SConscript	(revision 1460)
+++ vdrift-data/textures/icons/SConscript	(working copy)
@@ -19,5 +19,10 @@
 #--------------------#
 # Install data files #
 #--------------------#
-install = env.Install(Dir(env.subst('$data_directory/textures/icons')), src)
-env.Alias('install', install)
+# Install the icons per the Icon Theme Specification (see:
+# https://specifications.freedesktop.org/icon-theme-spec/)
+iconsdir = Dir(env.subst('$icons_directory')).abspath
+install1 = env.InstallAs(iconsdir + '/16x16/apps/vdrift.png', 'vdrift-16x16.png')
+install2 = env.InstallAs(iconsdir + '/32x32/apps/vdrift.png', 'vdrift-32x32.png')
+install3 = env.InstallAs(iconsdir + '/64x64/apps/vdrift.png', 'vdrift-64x64.png')
+env.Alias('install', [install1, install2, install3])

[Apteryks]

This for example makes the icon for the VDrift menu entry work in GNOME (and other desktop environment) as part of the standard installation (previously packagers would have had to add a manual phase or some patching of their own).

[logzero]

Thanks.

[Apteryks]

That was quick, thank you!

[Apteryks]

@logzero I think the part on this repository (vdrift itself) hasn't been merged, right? Was this an oversight?

[Apteryks]

Thanks, it works better now:

$ find /gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor/16x16
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor/16x16/apps
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor/16x16/apps/vdrift.png
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor/32x32
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor/32x32/apps
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor/32x32/apps/vdrift.png
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor/64x64
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor/64x64/apps
/gnu/store/ir3pqnp2xza3yzxb2i02mrn3hvfy62vf-vdrift-2014-10-20-0.120ae28/share/icons/hicolor/64x64/apps/vdrift.png