environment: make default env path configurable

Normally the default path to save the environment is /dev/env0. However,
we can't map a file in a fat filesystem to /dev/env0. So if we want to
store the environment in a file in fat we have to make it configurable.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands/loadenv.c

@@ -36,7 +36,7 @@ static int do_loadenv(struct command *cmdtp, int argc, char *argv[])
 	else
 		dirname = argv[2];
 	if (argc < 2)
-		filename = "/dev/env0";
+		filename = default_environment_path;
 	else
 		filename = argv[1];
 	printf("loading environment from %s\n", filename);

commands/saveenv.c

@@ -41,7 +41,7 @@ static int do_saveenv(struct command *cmdtp, int argc, char *argv[])
 	else
 		dirname = argv[2];
 	if (argc < 2)
-		filename = "/dev/env0";
+		filename = default_environment_path;
 	else
 		filename = argv[1];
 

common/environment.c

@@ -44,6 +44,8 @@
 #define EXPORT_SYMBOL(x)
 #endif
 
+char *default_environment_path = "/dev/env0";
+
 int file_size_action(const char *filename, struct stat *statbuf,
 			    void *userdata, int depth)
 {

common/startup.c

@@ -144,10 +144,11 @@ void start_barebox (void)
 	display_meminfo();
 
 #ifdef CONFIG_ENV_HANDLING
-	if (envfs_load("/dev/env0", "/env")) {
+	if (envfs_load(default_environment_path, "/env")) {
 #ifdef CONFIG_DEFAULT_ENVIRONMENT
-		printf("no valid environment found on /dev/env0. "
-			"Using default environment\n");
+		printf("no valid environment found on %s. "
+			"Using default environment\n",
+			default_environment_path);
 		envfs_load("/dev/defaultenv", "/env");
 #endif
 	}

include/environment.h

@@ -62,6 +62,9 @@ static inline int setenv(const char *var, const char *val)
 int env_pop_context(void);
 int env_push_context(void);
 
+/* defaults to /dev/env0 */
+extern char *default_environment_path;
+
 int envfs_load(char *filename, char *dirname);
 int envfs_save(char *filename, char *dirname);