util/qemu-config.c - qemu - Git at Google

 #include "qemu-common.h"
 #include "qemu/error-report.h"
 #include "qemu/option.h"
 #include "qemu/config-file.h"
 #include "qapi/qmp/qerror.h"
 #include "hw/qdev.h"
 #include "qapi/error.h"
 #include "qmp-commands.h"

 static QemuOptsList *vm_config_groups[32];
 static QemuOptsList *drive_config_groups[4];

 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
                                Error **errp)
 {
     int i;

     for (i = 0; lists[i] != NULL; i++) {
         if (strcmp(lists[i]->name, group) == 0)
             break;
     }
     if (lists[i] == NULL) {
         error_set(errp, QERR_INVALID_OPTION_GROUP, group);
     }
     return lists[i];
 }

 QemuOptsList *qemu_find_opts(const char *group)
 {
     QemuOptsList *ret;
     Error *local_err = NULL;

     ret = find_list(vm_config_groups, group, &local_err);
     if (error_is_set(&local_err)) {
         error_report("%s", error_get_pretty(local_err));
         error_free(local_err);
     }

     return ret;
 }

 static CommandLineParameterInfoList *query_option_descs(const QemuOptDesc *desc)
 {
     CommandLineParameterInfoList *param_list = NULL, *entry;
     CommandLineParameterInfo *info;
     int i;

     for (i = 0; desc[i].name != NULL; i++) {
         info = g_malloc0(sizeof(*info));
         info->name = g_strdup(desc[i].name);

         switch (desc[i].type) {
         case QEMU_OPT_STRING:
             info->type = COMMAND_LINE_PARAMETER_TYPE_STRING;
             break;
         case QEMU_OPT_BOOL:
             info->type = COMMAND_LINE_PARAMETER_TYPE_BOOLEAN;
             break;
         case QEMU_OPT_NUMBER:
             info->type = COMMAND_LINE_PARAMETER_TYPE_NUMBER;
             break;
         case QEMU_OPT_SIZE:
             info->type = COMMAND_LINE_PARAMETER_TYPE_SIZE;
             break;
         }

         if (desc[i].help) {
             info->has_help = true;
             info->help = g_strdup(desc[i].help);
         }

         entry = g_malloc0(sizeof(*entry));
         entry->value = info;
         entry->next = param_list;
         param_list = entry;
     }

     return param_list;
 }

 /* remove repeated entry from the info list */
 static void cleanup_infolist(CommandLineParameterInfoList *head)
 {
     CommandLineParameterInfoList *pre_entry, *cur, *del_entry;

     cur = head;
     while (cur->next) {
         pre_entry = head;
         while (pre_entry != cur->next) {
             if (!strcmp(pre_entry->value->name, cur->next->value->name)) {
                 del_entry = cur->next;
                 cur->next = cur->next->next;
                 g_free(del_entry);
                 break;
             }
             pre_entry = pre_entry->next;
         }
         cur = cur->next;
     }
 }

 /* merge the description items of two parameter infolists */
 static void connect_infolist(CommandLineParameterInfoList *head,
                              CommandLineParameterInfoList *new)
 {
     CommandLineParameterInfoList *cur;

     cur = head;
     while (cur->next) {
         cur = cur->next;
     }
     cur->next = new;
 }

 /* access all the local QemuOptsLists for drive option */
 static CommandLineParameterInfoList *get_drive_infolist(void)
 {
     CommandLineParameterInfoList *head = NULL, *cur;
     int i;

     for (i = 0; drive_config_groups[i] != NULL; i++) {
         if (!head) {
             head = query_option_descs(drive_config_groups[i]->desc);
         } else {
             cur = query_option_descs(drive_config_groups[i]->desc);
             connect_infolist(head, cur);
         }
     }
     cleanup_infolist(head);

     return head;
 }

 CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
                                                           const char *option,
                                                           Error **errp)
 {
     CommandLineOptionInfoList *conf_list = NULL, *entry;
     CommandLineOptionInfo *info;
     int i;

     for (i = 0; vm_config_groups[i] != NULL; i++) {
         if (!has_option || !strcmp(option, vm_config_groups[i]->name)) {
             info = g_malloc0(sizeof(*info));
             info->option = g_strdup(vm_config_groups[i]->name);
             if (!strcmp("drive", vm_config_groups[i]->name)) {
                 info->parameters = get_drive_infolist();
             } else {
                 info->parameters =
                     query_option_descs(vm_config_groups[i]->desc);
             }
             entry = g_malloc0(sizeof(*entry));
             entry->value = info;
             entry->next = conf_list;
             conf_list = entry;
         }
     }

     if (conf_list == NULL) {
         error_setg(errp, "invalid option name: %s", option);
     }

     return conf_list;
 }

 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
 {
     return find_list(vm_config_groups, group, errp);
 }

 void qemu_add_drive_opts(QemuOptsList *list)
 {
     int entries, i;

     entries = ARRAY_SIZE(drive_config_groups);
     entries--; /* keep list NULL terminated */
     for (i = 0; i < entries; i++) {
         if (drive_config_groups[i] == NULL) {
             drive_config_groups[i] = list;
             return;
         }
     }
     fprintf(stderr, "ran out of space in drive_config_groups");
     abort();
 }

 void qemu_add_opts(QemuOptsList *list)
 {
     int entries, i;

     entries = ARRAY_SIZE(vm_config_groups);
     entries--; /* keep list NULL terminated */
     for (i = 0; i < entries; i++) {
         if (vm_config_groups[i] == NULL) {
             vm_config_groups[i] = list;
             return;
         }
     }
     fprintf(stderr, "ran out of space in vm_config_groups");
     abort();
 }

 int qemu_set_option(const char *str)
 {
     char group[64], id[64], arg[64];
     QemuOptsList *list;
     QemuOpts *opts;
     int rc, offset;

     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
     if (rc < 3 || str[offset] != '=') {
         error_report("can't parse: \"%s\"", str);
         return -1;
     }

     list = qemu_find_opts(group);
     if (list == NULL) {
         return -1;
     }

     opts = qemu_opts_find(list, id);
     if (!opts) {
         error_report("there is no %s \"%s\" defined",
                      list->name, id);
         return -1;
     }

     if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
         return -1;
     }
     return 0;
 }

 struct ConfigWriteData {
     QemuOptsList *list;
     FILE *fp;
 };

 static int config_write_opt(const char *name, const char *value, void *opaque)
 {
     struct ConfigWriteData *data = opaque;

     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
     return 0;
 }

 static int config_write_opts(QemuOpts *opts, void *opaque)
 {
     struct ConfigWriteData *data = opaque;
     const char *id = qemu_opts_id(opts);

     if (id) {
         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
     } else {
         fprintf(data->fp, "[%s]\n", data->list->name);
     }
     qemu_opt_foreach(opts, config_write_opt, data, 0);
     fprintf(data->fp, "\n");
     return 0;
 }

 void qemu_config_write(FILE *fp)
 {
     struct ConfigWriteData data = { .fp = fp };
     QemuOptsList **lists = vm_config_groups;
     int i;

     fprintf(fp, "# qemu config file\n\n");
     for (i = 0; lists[i] != NULL; i++) {
         data.list = lists[i];
         qemu_opts_foreach(data.list, config_write_opts, &data, 0);
     }
 }

 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 {
     char line[1024], group[64], id[64], arg[64], value[1024];
     Location loc;
     QemuOptsList *list = NULL;
     Error *local_err = NULL;
     QemuOpts *opts = NULL;
     int res = -1, lno = 0;

     loc_push_none(&loc);
     while (fgets(line, sizeof(line), fp) != NULL) {
         loc_set_file(fname, ++lno);
         if (line[0] == '\n') {
             /* skip empty lines */
             continue;
         }
         if (line[0] == '#') {
             /* comment */
             continue;
         }
         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
             /* group with id */
             list = find_list(lists, group, &local_err);
             if (error_is_set(&local_err)) {
                 error_report("%s", error_get_pretty(local_err));
                 error_free(local_err);
                 goto out;
             }
             opts = qemu_opts_create(list, id, 1, NULL);
             continue;
         }
         if (sscanf(line, "[%63[^]]]", group) == 1) {
             /* group without id */
             list = find_list(lists, group, &local_err);
             if (error_is_set(&local_err)) {
                 error_report("%s", error_get_pretty(local_err));
                 error_free(local_err);
                 goto out;
             }
             opts = qemu_opts_create_nofail(list);
             continue;
         }
         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
             /* arg = value */
             if (opts == NULL) {
                 error_report("no group defined");
                 goto out;
             }
             if (qemu_opt_set(opts, arg, value) != 0) {
                 goto out;
             }
             continue;
         }
         error_report("parse error");
         goto out;
     }
     if (ferror(fp)) {
         error_report("error reading file");
         goto out;
     }
     res = 0;
 out:
     loc_pop(&loc);
     return res;
 }

 int qemu_read_config_file(const char *filename)
 {
     FILE *f = fopen(filename, "r");
     int ret;

     if (f == NULL) {
         return -errno;
     }

     ret = qemu_config_parse(f, vm_config_groups, filename);
     fclose(f);

     if (ret == 0) {
         return 0;
     } else {
         return -EINVAL;
     }
 }
	#include "qemu-common.h"
	#include "qemu/error-report.h"
	#include "qemu/option.h"
	#include "qemu/config-file.h"
	#include "qapi/qmp/qerror.h"
	#include "hw/qdev.h"
	#include "qapi/error.h"
	#include "qmp-commands.h"

	static QemuOptsList *vm_config_groups[32];
	static QemuOptsList *drive_config_groups[4];

	static QemuOptsList find_list(QemuOptsList lists, const char group,
	Error **errp)
	{
	int i;

	for (i = 0; lists[i] != NULL; i++) {
	if (strcmp(lists[i]->name, group) == 0)
	break;
	}
	if (lists[i] == NULL) {
	error_set(errp, QERR_INVALID_OPTION_GROUP, group);
	}
	return lists[i];
	}

	QemuOptsList qemu_find_opts(const char group)
	{
	QemuOptsList *ret;
	Error *local_err = NULL;

	ret = find_list(vm_config_groups, group, &local_err);
	if (error_is_set(&local_err)) {
	error_report("%s", error_get_pretty(local_err));
	error_free(local_err);
	}

	return ret;
	}

	static CommandLineParameterInfoList query_option_descs(const QemuOptDesc desc)
	{
	CommandLineParameterInfoList param_list = NULL, entry;
	CommandLineParameterInfo *info;
	int i;

	for (i = 0; desc[i].name != NULL; i++) {
	info = g_malloc0(sizeof(*info));
	info->name = g_strdup(desc[i].name);

	switch (desc[i].type) {
	case QEMU_OPT_STRING:
	info->type = COMMAND_LINE_PARAMETER_TYPE_STRING;
	break;
	case QEMU_OPT_BOOL:
	info->type = COMMAND_LINE_PARAMETER_TYPE_BOOLEAN;
	break;
	case QEMU_OPT_NUMBER:
	info->type = COMMAND_LINE_PARAMETER_TYPE_NUMBER;
	break;
	case QEMU_OPT_SIZE:
	info->type = COMMAND_LINE_PARAMETER_TYPE_SIZE;
	break;
	}

	if (desc[i].help) {
	info->has_help = true;
	info->help = g_strdup(desc[i].help);
	}

	entry = g_malloc0(sizeof(*entry));
	entry->value = info;
	entry->next = param_list;
	param_list = entry;
	}

	return param_list;
	}

	/* remove repeated entry from the info list */
	static void cleanup_infolist(CommandLineParameterInfoList *head)
	{
	CommandLineParameterInfoList pre_entry, cur, *del_entry;

	cur = head;
	while (cur->next) {
	pre_entry = head;
	while (pre_entry != cur->next) {
	if (!strcmp(pre_entry->value->name, cur->next->value->name)) {
	del_entry = cur->next;
	cur->next = cur->next->next;
	g_free(del_entry);
	break;
	}
	pre_entry = pre_entry->next;
	}
	cur = cur->next;
	}
	}

	/* merge the description items of two parameter infolists */
	static void connect_infolist(CommandLineParameterInfoList *head,
	CommandLineParameterInfoList *new)
	{
	CommandLineParameterInfoList *cur;

	cur = head;
	while (cur->next) {
	cur = cur->next;
	}
	cur->next = new;
	}

	/* access all the local QemuOptsLists for drive option */
	static CommandLineParameterInfoList *get_drive_infolist(void)
	{
	CommandLineParameterInfoList head = NULL, cur;
	int i;

	for (i = 0; drive_config_groups[i] != NULL; i++) {
	if (!head) {
	head = query_option_descs(drive_config_groups[i]->desc);
	} else {
	cur = query_option_descs(drive_config_groups[i]->desc);
	connect_infolist(head, cur);
	}
	}
	cleanup_infolist(head);

	return head;
	}

	CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
	const char *option,
	Error **errp)
	{
	CommandLineOptionInfoList conf_list = NULL, entry;
	CommandLineOptionInfo *info;
	int i;

	for (i = 0; vm_config_groups[i] != NULL; i++) {
	if (!has_option \|\| !strcmp(option, vm_config_groups[i]->name)) {
	info = g_malloc0(sizeof(*info));
	info->option = g_strdup(vm_config_groups[i]->name);
	if (!strcmp("drive", vm_config_groups[i]->name)) {
	info->parameters = get_drive_infolist();
	} else {
	info->parameters =
	query_option_descs(vm_config_groups[i]->desc);
	}
	entry = g_malloc0(sizeof(*entry));
	entry->value = info;
	entry->next = conf_list;
	conf_list = entry;
	}
	}

	if (conf_list == NULL) {
	error_setg(errp, "invalid option name: %s", option);
	}

	return conf_list;
	}

	QemuOptsList qemu_find_opts_err(const char group, Error **errp)
	{
	return find_list(vm_config_groups, group, errp);
	}

	void qemu_add_drive_opts(QemuOptsList *list)
	{
	int entries, i;

	entries = ARRAY_SIZE(drive_config_groups);
	entries--; /* keep list NULL terminated */
	for (i = 0; i < entries; i++) {
	if (drive_config_groups[i] == NULL) {
	drive_config_groups[i] = list;
	return;
	}
	}
	fprintf(stderr, "ran out of space in drive_config_groups");
	abort();
	}

	void qemu_add_opts(QemuOptsList *list)
	{
	int entries, i;

	entries = ARRAY_SIZE(vm_config_groups);
	entries--; /* keep list NULL terminated */
	for (i = 0; i < entries; i++) {
	if (vm_config_groups[i] == NULL) {
	vm_config_groups[i] = list;
	return;
	}
	}
	fprintf(stderr, "ran out of space in vm_config_groups");
	abort();
	}

	int qemu_set_option(const char *str)
	{
	char group[64], id[64], arg[64];
	QemuOptsList *list;
	QemuOpts *opts;
	int rc, offset;

	rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
	if (rc < 3 \|\| str[offset] != '=') {
	error_report("can't parse: \"%s\"", str);
	return -1;
	}

	list = qemu_find_opts(group);
	if (list == NULL) {
	return -1;
	}

	opts = qemu_opts_find(list, id);
	if (!opts) {
	error_report("there is no %s \"%s\" defined",
	list->name, id);
	return -1;
	}

	if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
	return -1;
	}
	return 0;
	}

	struct ConfigWriteData {
	QemuOptsList *list;
	FILE *fp;
	};

	static int config_write_opt(const char name, const char value, void *opaque)
	{
	struct ConfigWriteData *data = opaque;

	fprintf(data->fp, " %s = \"%s\"\n", name, value);
	return 0;
	}

	static int config_write_opts(QemuOpts opts, void opaque)
	{
	struct ConfigWriteData *data = opaque;
	const char *id = qemu_opts_id(opts);

	if (id) {
	fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
	} else {
	fprintf(data->fp, "[%s]\n", data->list->name);
	}
	qemu_opt_foreach(opts, config_write_opt, data, 0);
	fprintf(data->fp, "\n");
	return 0;
	}

	void qemu_config_write(FILE *fp)
	{
	struct ConfigWriteData data = { .fp = fp };
	QemuOptsList **lists = vm_config_groups;
	int i;

	fprintf(fp, "# qemu config file\n\n");
	for (i = 0; lists[i] != NULL; i++) {
	data.list = lists[i];
	qemu_opts_foreach(data.list, config_write_opts, &data, 0);
	}
	}

	int qemu_config_parse(FILE fp, QemuOptsList lists, const char fname)
	{
	char line[1024], group[64], id[64], arg[64], value[1024];
	Location loc;
	QemuOptsList *list = NULL;
	Error *local_err = NULL;
	QemuOpts *opts = NULL;
	int res = -1, lno = 0;

	loc_push_none(&loc);
	while (fgets(line, sizeof(line), fp) != NULL) {
	loc_set_file(fname, ++lno);
	if (line[0] == '\n') {
	/* skip empty lines */
	continue;
	}
	if (line[0] == '#') {
	/* comment */
	continue;
	}
	if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
	/* group with id */
	list = find_list(lists, group, &local_err);
	if (error_is_set(&local_err)) {
	error_report("%s", error_get_pretty(local_err));
	error_free(local_err);
	goto out;
	}
	opts = qemu_opts_create(list, id, 1, NULL);
	continue;
	}
	if (sscanf(line, "[%63[^]]]", group) == 1) {
	/* group without id */
	list = find_list(lists, group, &local_err);
	if (error_is_set(&local_err)) {
	error_report("%s", error_get_pretty(local_err));
	error_free(local_err);
	goto out;
	}
	opts = qemu_opts_create_nofail(list);
	continue;
	}
	if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
	/* arg = value */
	if (opts == NULL) {
	error_report("no group defined");
	goto out;
	}
	if (qemu_opt_set(opts, arg, value) != 0) {
	goto out;
	}
	continue;
	}
	error_report("parse error");
	goto out;
	}
	if (ferror(fp)) {
	error_report("error reading file");
	goto out;
	}
	res = 0;
	out:
	loc_pop(&loc);
	return res;
	}

	int qemu_read_config_file(const char *filename)
	{
	FILE *f = fopen(filename, "r");
	int ret;

	if (f == NULL) {
	return -errno;
	}

	ret = qemu_config_parse(f, vm_config_groups, filename);
	fclose(f);

	if (ret == 0) {
	return 0;
	} else {
	return -EINVAL;
	}
	}