Pass config file from compositor to everything

We have the Weston command line option '--no-config' which is meant to
prevent loading weston.ini at all. It works for Weston itself, but it
does not work for any clients that also want to read weston.ini.

To fix that, introduce a new environment variable WESTON_CONFIG_FILE.
Weston will set it to the absolute path of the config file it loads.
Clients will load the config file pointed to by WESTON_CONFIG_FILE. If
the environment variable is set but empty, no config file will be
loaded. If the variable is unset, things fall back to the default
"weston.ini".

Note, that Weston will only set WESTON_CONFIG_FILE, it never reads it.
The ability to specify a custom config file to load will be another patch.

All programs that loaded "weston.ini" are modified to honour
WESTON_CONFIG_FILE.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Jonny Lamb <jonny.lamb@collabora.co.uk>
Reviewed-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>

clients/desktop-shell.c

@@ -1328,11 +1328,13 @@ int main(int argc, char *argv[])
 	struct desktop desktop = { 0 };
 	struct output *output;
 	struct weston_config_section *s;
+	const char *config_file;
 
 	desktop.unlock_task.run = unlock_dialog_finish;
 	wl_list_init(&desktop.outputs);
 
-	desktop.config = weston_config_parse("weston.ini");
+	config_file = weston_config_get_name_from_env();
+	desktop.config = weston_config_parse(config_file);
 	s = weston_config_get_section(desktop.config, "shell", NULL, NULL);
 	weston_config_section_get_bool(s, "locking", &desktop.locking, 1);
 

clients/ivi-shell-user-interface.c

@@ -1073,6 +1073,7 @@ create_launchers(struct wlContextCommon *cmm, struct wl_list *launcher_list)
 static struct hmi_homescreen_setting *
 hmi_homescreen_setting_create(void)
 {
+	const char *config_file;
 	struct weston_config *config = NULL;
 	struct weston_config_section *shellSection = NULL;
 	struct hmi_homescreen_setting *setting = MEM_ALLOC(sizeof(*setting));
@@ -1084,7 +1085,8 @@ hmi_homescreen_setting_create(void)
 	wl_list_init(&setting->workspace_list);
 	wl_list_init(&setting->launcher_list);
 
-	config = weston_config_parse("weston.ini");
+	config_file = weston_config_get_name_from_env();
+	config = weston_config_parse(config_file);
 
 	shellSection =
 		weston_config_get_section(config, "ivi-shell", NULL, NULL);

clients/terminal.c

@@ -3050,6 +3050,7 @@ int main(int argc, char *argv[])
 {
 	struct display *d;
 	struct terminal *terminal;
+	const char *config_file;
 	struct weston_config *config;
 	struct weston_config_section *s;
 
@@ -3061,7 +3062,8 @@ int main(int argc, char *argv[])
 	if (!option_shell)
 		option_shell = "/bin/bash";
 
-	config = weston_config_parse("weston.ini");
+	config_file = weston_config_get_name_from_env();
+	config = weston_config_parse(config_file);
 	s = weston_config_get_section(config, "terminal", NULL, NULL);
 	weston_config_section_get_string(s, "font", &option_font, "mono");
 	weston_config_section_get_int(s, "font-size", &option_font_size, 14);

clients/window.c

@@ -1288,6 +1288,7 @@ static const struct cursor_alternatives cursors[] = {
 static void
 create_cursors(struct display *display)
 {
+	const char *config_file;
 	struct weston_config *config;
 	struct weston_config_section *s;
 	int size;
@@ -1295,7 +1296,8 @@ create_cursors(struct display *display)
 	unsigned int i, j;
 	struct wl_cursor *cursor;
 
-	config = weston_config_parse("weston.ini");
+	config_file = weston_config_get_name_from_env();
+	config = weston_config_parse(config_file);
 	s = weston_config_get_section(config, "shell", NULL, NULL);
 	weston_config_section_get_string(s, "cursor-theme", &theme, NULL);
 	weston_config_section_get_int(s, "cursor-size", &size, 32);