#include <sys/types.h>
#include <string.h>
+#include <stdlib.h>
+#include <log/log.h>
#include <types/types.h>
#include <talloc/talloc.h>
#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 {
+ char *name;
+ char *value;
+ struct list_item list;
+};
+
+struct grub2_symtab_entry {
const char *name;
- const char *value;
+ grub2_function fn;
+ void *data;
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)
+{
+ struct grub2_symtab_entry *entry;
+
+ list_for_each_entry(&script->symtab, entry, list) {
+ if (!strcmp(entry->name, name))
+ return entry;
+ }
+
+ return NULL;
+}
+
const char *script_env_get(struct grub2_script *script, const char *name)
{
struct env_entry *entry;
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)
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.
*
struct grub2_statement *statement)
{
struct grub2_statement_simple *st = to_stmt_simple(statement);
- struct grub2_command *cmd;
+ struct grub2_symtab_entry *entry;
+ char *pos;
int rc;
if (!st->argv)
if (!st->argv->argc)
return 0;
- cmd = script_lookup_command(script, st->argv->argv[0]);
- if (!cmd) {
- fprintf(stderr, "undefined command '%s'\n", st->argv->argv[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;
}
- rc = cmd->exec(script, st->argv->argc, st->argv->argv);
+ entry = script_lookup_function(script, st->argv->argv[0]);
+ if (!entry) {
+ 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);
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;
}
{
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;
}
-static void init_env(struct grub2_script *script)
+static int function_invoke(struct grub2_script *script,
+ void *data, int argc, char **argv)
{
- struct env_entry *env;
+ struct grub2_statement_function *fn = data;
+ char *name;
+ int i;
- list_init(&script->environment);
+ /* set positional parameters */
+ for (i = 0; i < argc; i++) {
+ name = talloc_asprintf(script, "$%d", i);
+ script_env_set(script, name, argv[i]);
+ }
- env = talloc(script, struct env_entry);
- env->name = talloc_strdup(env, "prefix");
- env->value = talloc_strdup(env, "/");
+ return statements_execute(script, fn->body);
+}
+
+int statement_function_execute(struct grub2_script *script,
+ struct grub2_statement *statement)
+{
+ struct grub2_statement_function *st = to_stmt_function(statement);
+ const char *name;
- list_add(&script->environment, &env->list);
+ if (st->name->type == GRUB2_WORD_VAR)
+ expand_var(script, st->name);
+
+ name = st->name->text;
+ script_register_function(script, name, function_invoke, st);
+
+ return 0;
}
-struct grub2_command *script_lookup_command(struct grub2_script *script,
- const char *name)
+static void init_env(struct grub2_script *script)
{
- struct grub2_command *command;
+ struct env_entry *env;
+ char *prefix, *sep;
- list_for_each_entry(&script->commands, command, list) {
- if (!strcmp(command->name, name))
- return command;
+ list_init(&script->environment);
+
+ /* use location of the parsed config file to determine the prefix */
+ env = talloc(script, struct env_entry);
+
+ prefix = NULL;
+ if (script->filename) {
+ sep = strrchr(script->filename, '/');
+ if (sep)
+ prefix = talloc_strndup(env, script->filename,
+ sep - script->filename);
}
- return NULL;
+ script_env_set(script, "prefix", prefix ? : default_prefix);
+ if (prefix)
+ talloc_free(prefix);
}
-void script_register_command(struct grub2_script *script,
- struct grub2_command *command)
+void script_register_function(struct grub2_script *script,
+ const char *name, grub2_function fn,
+ void *data)
{
- list_add(&script->commands, &command->list);
+ struct grub2_symtab_entry *entry;
+
+ entry = talloc(script, struct grub2_symtab_entry);
+ entry->fn = fn;
+ entry->name = name;
+ entry->data = data;
+ list_add(&script->symtab, &entry->list);
}
void script_execute(struct grub2_script *script)
{
+ init_env(script);
statements_execute(script, script->statements);
}
{
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->commands);
+ list_init(&script->symtab);
register_builtins(script);
return script;
projects / petitboot / blobdiff