util/qemu-config.c

   1 #include "qemu-common.h"
   2 #include "qemu/error-report.h"
   3 #include "qemu/option.h"
   4 #include "qemu/config-file.h"
   5 #include "hw/qdev.h"
   6 #include "qapi/error.h"
   7
   8 static QemuOptsList *vm_config_groups[32];
   9
  10 static QemuOptsList *find_list(QemuOptsList **lists, const char *group,
  11                                Error **errp)
  12 {
  13     int i;
  14
  15     for (i = 0; lists[i] != NULL; i++) {
  16         if (strcmp(lists[i]->name, group) == 0)
  17             break;
  18     }
  19     if (lists[i] == NULL) {
  20         error_set(errp, QERR_INVALID_OPTION_GROUP, group);
  21     }
  22     return lists[i];
  23 }
  24
  25 QemuOptsList *qemu_find_opts(const char *group)
  26 {
  27     QemuOptsList *ret;
  28     Error *local_err = NULL;
  29
  30     ret = find_list(vm_config_groups, group, &local_err);
  31     if (error_is_set(&local_err)) {
  32         error_report("%s\n", error_get_pretty(local_err));
  33         error_free(local_err);
  34     }
  35
  36     return ret;
  37 }
  38
  39 QemuOptsList *qemu_find_opts_err(const char *group, Error **errp)
  40 {
  41     return find_list(vm_config_groups, group, errp);
  42 }
  43
  44 void qemu_add_opts(QemuOptsList *list)
  45 {
  46     int entries, i;
  47
  48     entries = ARRAY_SIZE(vm_config_groups);
  49     entries--; /* keep list NULL terminated */
  50     for (i = 0; i < entries; i++) {
  51         if (vm_config_groups[i] == NULL) {
  52             vm_config_groups[i] = list;
  53             return;
  54         }
  55     }
  56     fprintf(stderr, "ran out of space in vm_config_groups");
  57     abort();
  58 }
  59
  60 int qemu_set_option(const char *str)
  61 {
  62     char group[64], id[64], arg[64];
  63     QemuOptsList *list;
  64     QemuOpts *opts;
  65     int rc, offset;
  66
  67     rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
  68     if (rc < 3 || str[offset] != '=') {
  69         error_report("can't parse: \"%s\"", str);
  70         return -1;
  71     }
  72
  73     list = qemu_find_opts(group);
  74     if (list == NULL) {
  75         return -1;
  76     }
  77
  78     opts = qemu_opts_find(list, id);
  79     if (!opts) {
  80         error_report("there is no %s \"%s\" defined",
  81                      list->name, id);
  82         return -1;
  83     }
  84
  85     if (qemu_opt_set(opts, arg, str+offset+1) == -1) {
  86         return -1;
  87     }
  88     return 0;
  89 }
  90
  91 struct ConfigWriteData {
  92     QemuOptsList *list;
  93     FILE *fp;
  94 };
  95
  96 static int config_write_opt(const char *name, const char *value, void *opaque)
  97 {
  98     struct ConfigWriteData *data = opaque;
  99
 100     fprintf(data->fp, "  %s = \"%s\"\n", name, value);
 101     return 0;
 102 }
 103
 104 static int config_write_opts(QemuOpts *opts, void *opaque)
 105 {
 106     struct ConfigWriteData *data = opaque;
 107     const char *id = qemu_opts_id(opts);
 108
 109     if (id) {
 110         fprintf(data->fp, "[%s \"%s\"]\n", data->list->name, id);
 111     } else {
 112         fprintf(data->fp, "[%s]\n", data->list->name);
 113     }
 114     qemu_opt_foreach(opts, config_write_opt, data, 0);
 115     fprintf(data->fp, "\n");
 116     return 0;
 117 }
 118
 119 void qemu_config_write(FILE *fp)
 120 {
 121     struct ConfigWriteData data = { .fp = fp };
 122     QemuOptsList **lists = vm_config_groups;
 123     int i;
 124
 125     fprintf(fp, "# qemu config file\n\n");
 126     for (i = 0; lists[i] != NULL; i++) {
 127         data.list = lists[i];
 128         qemu_opts_foreach(data.list, config_write_opts, &data, 0);
 129     }
 130 }
 131
 132 int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
 133 {
 134     char line[1024], group[64], id[64], arg[64], value[1024];
 135     Location loc;
 136     QemuOptsList *list = NULL;
 137     Error *local_err = NULL;
 138     QemuOpts *opts = NULL;
 139     int res = -1, lno = 0;
 140
 141     loc_push_none(&loc);
 142     while (fgets(line, sizeof(line), fp) != NULL) {
 143         loc_set_file(fname, ++lno);
 144         if (line[0] == '\n') {
 145             /* skip empty lines */
 146             continue;
 147         }
 148         if (line[0] == '#') {
 149             /* comment */
 150             continue;
 151         }
 152         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
 153             /* group with id */
 154             list = find_list(lists, group, &local_err);
 155             if (error_is_set(&local_err)) {
 156                 error_report("%s\n", error_get_pretty(local_err));
 157                 error_free(local_err);
 158                 goto out;
 159             }
 160             opts = qemu_opts_create(list, id, 1, NULL);
 161             continue;
 162         }
 163         if (sscanf(line, "[%63[^]]]", group) == 1) {
 164             /* group without id */
 165             list = find_list(lists, group, &local_err);
 166             if (error_is_set(&local_err)) {
 167                 error_report("%s\n", error_get_pretty(local_err));
 168                 error_free(local_err);
 169                 goto out;
 170             }
 171             opts = qemu_opts_create_nofail(list);
 172             continue;
 173         }
 174         if (sscanf(line, " %63s = \"%1023[^\"]\"", arg, value) == 2) {
 175             /* arg = value */
 176             if (opts == NULL) {
 177                 error_report("no group defined");
 178                 goto out;
 179             }
 180             if (qemu_opt_set(opts, arg, value) != 0) {
 181                 goto out;
 182             }
 183             continue;
 184         }
 185         error_report("parse error");
 186         goto out;
 187     }
 188     if (ferror(fp)) {
 189         error_report("error reading file");
 190         goto out;
 191     }
 192     res = 0;
 193 out:
 194     loc_pop(&loc);
 195     return res;
 196 }
 197
 198 int qemu_read_config_file(const char *filename)
 199 {
 200     FILE *f = fopen(filename, "r");
 201     int ret;
 202
 203     if (f == NULL) {
 204         return -errno;
 205     }
 206
 207     ret = qemu_config_parse(f, vm_config_groups, filename);
 208     fclose(f);
 209
 210     if (ret == 0) {
 211         return 0;
 212     } else {
 213         return -EINVAL;
 214     }
 215 }