shared: Update all users of DATADIR

Replace every use of DATADIR to create a filename with a call to the new
function that allows overriding DATADIR with an env var at runtime.

No attention is paid to asprintf failure.

This restores make distcheck to a passing state after commit 6b58ea
began checking cairo surfaces for validity and exchanged undefined
behaviour we shouldn't have been dependent on for consistent test failure.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
[Pekka: split if-branches into two lines]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

clients/desktop-shell.c

@@ -49,6 +49,7 @@
 #include "shared/helpers.h"
 #include "shared/xalloc.h"
 #include "shared/zalloc.h"
+#include "shared/file-util.h"
 
 #include "weston-desktop-shell-client-protocol.h"
 
@@ -760,8 +761,12 @@ background_draw(struct widget *widget, void *data)
 	image = NULL;
 	if (background->image)
 		image = load_cairo_surface(background->image);
-	else if (background->color == 0)
-		image = load_cairo_surface(DATADIR "/weston/pattern.png");
+	else if (background->color == 0) {
+		char *name = file_name_with_datadir("pattern.png");
+
+		image = load_cairo_surface(name);
+		free(name);
+	}
 
 	if (image && background->type != -1) {
 		im_w = cairo_image_surface_get_width(image);
@@ -1351,10 +1356,13 @@ panel_add_launchers(struct panel *panel, struct desktop *desktop)
 	}
 
 	if (count == 0) {
+                char *name = file_name_with_datadir("terminal.png");
+
 		/* add default launcher */
 		panel_add_launcher(panel,
-				   DATADIR "/weston/terminal.png",
+				   name,
 				   BINDIR "/weston-terminal");
+		free(name);
 	}
 }
 

clients/ivi-shell-user-interface.c

@@ -43,6 +43,7 @@
 #include "shared/os-compatibility.h"
 #include "shared/xalloc.h"
 #include "shared/zalloc.h"
+#include "shared/file-util.h"
 #include "ivi-application-client-protocol.h"
 #include "ivi-hmi-controller-client-protocol.h"
 
@@ -1076,6 +1077,7 @@ hmi_homescreen_setting_create(void)
 	const char *name = NULL;
 	uint32_t workspace_layer_id;
 	uint32_t icon_surface_id = 0;
+	char *filename;
 
 	wl_list_init(&setting->workspace_list);
 	wl_list_init(&setting->launcher_list);
@@ -1095,51 +1097,65 @@ hmi_homescreen_setting_create(void)
 	weston_config_section_get_uint(
 		shellSection, "workspace-layer-id", &workspace_layer_id, 3000);
 
+	filename = file_name_with_datadir("background.png");
 	weston_config_section_get_string(
 		shellSection, "background-image", &setting->background.filePath,
-		DATADIR "/weston/background.png");
+		filename);
+	free(filename);
 
 	weston_config_section_get_uint(
 		shellSection, "background-id", &setting->background.id, 1001);
 
+	filename = file_name_with_datadir("panel.png");
 	weston_config_section_get_string(
 		shellSection, "panel-image", &setting->panel.filePath,
-		DATADIR "/weston/panel.png");
+		filename);
+	free(filename);
 
 	weston_config_section_get_uint(
 		shellSection, "panel-id", &setting->panel.id, 1002);
 
+	filename = file_name_with_datadir("tiling.png");
 	weston_config_section_get_string(
 		shellSection, "tiling-image", &setting->tiling.filePath,
-		DATADIR "/weston/tiling.png");
+		filename);
+	free(filename);
 
 	weston_config_section_get_uint(
 		shellSection, "tiling-id", &setting->tiling.id, 1003);
 
+	filename = file_name_with_datadir("sidebyside.png");
 	weston_config_section_get_string(
 		shellSection, "sidebyside-image", &setting->sidebyside.filePath,
-		DATADIR "/weston/sidebyside.png");
+		filename);
+	free(filename);
 
 	weston_config_section_get_uint(
 		shellSection, "sidebyside-id", &setting->sidebyside.id, 1004);
 
+	filename = file_name_with_datadir("fullscreen.png");
 	weston_config_section_get_string(
 		shellSection, "fullscreen-image", &setting->fullscreen.filePath,
-		DATADIR "/weston/fullscreen.png");
+		filename);
+	free(filename);
 
 	weston_config_section_get_uint(
 		shellSection, "fullscreen-id", &setting->fullscreen.id, 1005);
 
+	filename = file_name_with_datadir("random.png");
 	weston_config_section_get_string(
 		shellSection, "random-image", &setting->random.filePath,
-		DATADIR "/weston/random.png");
+		filename);
+	free(filename);
 
 	weston_config_section_get_uint(
 		shellSection, "random-id", &setting->random.id, 1006);
 
+	filename = file_name_with_datadir("home.png");
 	weston_config_section_get_string(
 		shellSection, "home-image", &setting->home.filePath,
-		DATADIR "/weston/home.png");
+		filename);
+	free(filename);
 
 	weston_config_section_get_uint(
 		shellSection, "home-id", &setting->home.id, 1007);