X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fgrub2%2Fscript.c;h=c4f58d92bacb27395647a23d9c4f9feb5d8d6016;hp=9c087373ac0454524308fa6da5370a0b86b69cc5;hb=d6b11766acb4457457419a84f460a3ce7a8f4693;hpb=e8a50ad2461a8efaa4d71ea19692a1b63a0f9bc2

diff --git a/discover/grub2/script.c b/discover/grub2/script.c
index 9c08737..c4f58d9 100644
--- a/discover/grub2/script.c
+++ b/discover/grub2/script.c
@@ -1,7 +1,9 @@
 
 #include <sys/types.h>
 #include <string.h>
+#include <stdlib.h>
 
+#include <log/log.h>
 #include <types/types.h>
 #include <talloc/talloc.h>
 
@@ -9,16 +11,20 @@
 
 #define to_stmt_simple(stmt) \
 	container_of(stmt, struct grub2_statement_simple, st)
+#define to_stmt_block(stmt) \
+	container_of(stmt, struct grub2_statement_block, st)
 #define to_stmt_if(stmt) \
 	container_of(stmt, struct grub2_statement_if, st)
 #define to_stmt_menuentry(stmt) \
 	container_of(stmt, struct grub2_statement_menuentry, st)
 #define to_stmt_function(stmt) \
 	container_of(stmt, struct grub2_statement_function, st)
+#define to_stmt_conditional(stmt) \
+	container_of(stmt, struct grub2_statement_conditional, st)
 
 struct env_entry {
-	const char		*name;
-	const char		*value;
+	char			*name;
+	char			*value;
 	struct list_item	list;
 };
 
@@ -29,6 +35,8 @@ struct grub2_symtab_entry {
 	struct list_item	list;
 };
 
+static const char *default_prefix = "/boot/grub";
+
 static struct grub2_symtab_entry *script_lookup_function(
 		struct grub2_script *script, const char *name)
 {
@@ -67,11 +75,13 @@ void script_env_set(struct grub2_script *script,
 
 	if (!entry) {
 		entry = talloc(script, struct env_entry);
-		entry->name = name;
+		entry->name = talloc_strdup(entry, name);
 		list_add(&script->environment, &entry->list);
+	} else {
+		talloc_free(entry->value);
 	}
 
-	entry->value = value;
+	entry->value = talloc_strdup(entry, value);
 }
 
 static bool expand_var(struct grub2_script *script, struct grub2_word *word)
@@ -92,6 +102,29 @@ static bool is_delim(char c)
 	return c == ' ' || c == '\t';
 }
 
+static bool option_is_default(struct grub2_script *script,
+		struct discover_boot_option *opt, const char *id)
+{
+	unsigned int default_idx;
+	const char *var;
+	char *end;
+
+	var = script_env_get(script, "default");
+	if (!var)
+		return false;
+
+	default_idx = strtoul(var, &end, 10);
+	if (end != var && *end == '\0')
+		return default_idx == script->n_options;
+
+	/* if we don't have an explicit id for this option, fall back to
+	 * the name */
+	if (!id)
+		id = opt->option->name;
+
+	return !strcmp(id, var);
+}
+
 /* For non-double-quoted variable expansions, we may need to split the
  * variable's value into multiple argv items.
  *
@@ -231,6 +264,7 @@ int statement_simple_execute(struct grub2_script *script,
 {
 	struct grub2_statement_simple *st = to_stmt_simple(statement);
 	struct grub2_symtab_entry *entry;
+	char *pos;
 	int rc;
 
 	if (!st->argv)
@@ -241,10 +275,21 @@ int statement_simple_execute(struct grub2_script *script,
 	if (!st->argv->argc)
 		return 0;
 
+	/* is this a var=value assignment? */
+	pos = strchr(st->argv->argv[0], '=');
+	if (pos) {
+		char *name, *value;
+		name = st->argv->argv[0];
+		name = talloc_strndup(st, name, pos - name);
+		value = pos + 1;
+		script_env_set(script, name, value);
+		return 0;
+	}
+
 	entry = script_lookup_function(script, st->argv->argv[0]);
 	if (!entry) {
-		fprintf(stderr, "undefined function '%s'\n", st->argv->argv[0]);
-		return 0;
+		pb_log("grub2: undefined function '%s'\n", st->argv->argv[0]);
+		return 1;
 	}
 
 	rc = entry->fn(script, entry->data, st->argv->argc, st->argv->argv);
@@ -252,24 +297,45 @@ int statement_simple_execute(struct grub2_script *script,
 	return rc;
 }
 
-int statement_if_execute(struct grub2_script *script,
+int statement_block_execute(struct grub2_script *script,
 		struct grub2_statement *statement)
 {
-	struct grub2_statement_if *st = to_stmt_if(statement);
-	struct grub2_statements *case_stmts;
+	struct grub2_statement_block *st = to_stmt_block(statement);
+	return statements_execute(script, st->statements);
+}
+
+/* returns 0 if the statement was executed, 1 otherwise */
+static int statement_conditional_execute(struct grub2_script *script,
+		struct grub2_statement *statement, bool *executed)
+{
+	struct grub2_statement_conditional *st = to_stmt_conditional(statement);
 	int rc;
 
 	rc = st->condition->exec(script, st->condition);
+	*executed = (!rc);
+	if (*executed)
+		rc = statements_execute(script, st->statements);
 
-	if (rc == 0)
-		case_stmts = st->true_case;
-	else
-		case_stmts = st->false_case;
+	return rc;
+}
 
-	if (case_stmts)
-		statements_execute(script, case_stmts);
-	else
-		rc = 0;
+int statement_if_execute(struct grub2_script *script,
+		struct grub2_statement *statement)
+{
+	struct grub2_statement_if *st = to_stmt_if(statement);
+	struct grub2_statement *conditional;
+	bool executed;
+	int rc = 0;
+
+	list_for_each_entry(&st->conditionals->list, conditional, list) {
+		rc = statement_conditional_execute(script,
+				conditional, &executed);
+		if (executed)
+			break;
+	}
+
+	if (!executed && st->else_case)
+		rc = statements_execute(script, st->else_case);
 
 	return rc;
 }
@@ -279,21 +345,39 @@ int statement_menuentry_execute(struct grub2_script *script,
 {
 	struct grub2_statement_menuentry *st = to_stmt_menuentry(statement);
 	struct discover_boot_option *opt;
+	const char *id = NULL;
+	int i;
 
 	process_expansions(script, st->argv);
 
 	opt = discover_boot_option_create(script->ctx, script->ctx->device);
-	if (st->argv->argc > 0) {
+
+	/* XXX: --options=values need to be parsed properly; this is a simple
+	 * implementation to get --id= working.
+	 */
+	for (i = 1; i < st->argv->argc; ++i) {
+		if (strncmp("--id=", st->argv->argv[i], 5) == 0) {
+			id = st->argv->argv[i] + 5;
+			break;
+		}
+	}
+	if (st->argv->argc > 0)
 		opt->option->name = talloc_strdup(opt, st->argv->argv[0]);
-	} else {
+	else
 		opt->option->name = talloc_strdup(opt, "(unknown)");
-	}
+
+	opt->option->id = talloc_asprintf(opt->option, "%s#%s",
+			script->ctx->device->device->id,
+			id ? id : opt->option->name);
 
 	script->opt = opt;
 
 	statements_execute(script, st->statements);
 
+	opt->option->is_default = option_is_default(script, opt, id);
+
 	discover_context_add_boot_option(script->ctx, opt);
+	script->n_options++;
 	script->opt = NULL;
 
 	return 0;
@@ -333,14 +417,24 @@ int statement_function_execute(struct grub2_script *script,
 static void init_env(struct grub2_script *script)
 {
 	struct env_entry *env;
+	char *prefix, *sep;
 
 	list_init(&script->environment);
 
+	/* use location of the parsed config file to determine the prefix */
 	env = talloc(script, struct env_entry);
-	env->name = talloc_strdup(env, "prefix");
-	env->value = talloc_strdup(env, "/");
 
-	list_add(&script->environment, &env->list);
+	prefix = NULL;
+	if (script->filename) {
+		sep = strrchr(script->filename, '/');
+		if (sep)
+			prefix = talloc_strndup(env, script->filename,
+					sep - script->filename);
+	}
+
+	script_env_set(script, "prefix", prefix ? : default_prefix);
+	if (prefix)
+		talloc_free(prefix);
 }
 
 void script_register_function(struct grub2_script *script,
@@ -359,6 +453,7 @@ void script_register_function(struct grub2_script *script,
 
 void script_execute(struct grub2_script *script)
 {
+	init_env(script);
 	statements_execute(script, script->statements);
 }
 
@@ -367,11 +462,9 @@ struct grub2_script *create_script(struct grub2_parser *parser,
 {
 	struct grub2_script *script;
 
-	script = talloc(parser, struct grub2_script);
+	script = talloc_zero(parser, struct grub2_script);
 
-	init_env(script);
 	script->ctx = ctx;
-	script->opt = NULL;
 
 	list_init(&script->symtab);
 	register_builtins(script);