git.ozlabs.org Git - petitboot/blob - discover/yaboot-parser.c

   1 #define _GNU_SOURCE
   2
   3 #include <assert.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <ctype.h>
   7
   8 #include "log/log.h"
   9 #include "talloc/talloc.h"
  10 #include "types/types.h"
  11 #include "parser-conf.h"
  12 #include "parser-utils.h"
  13 #include "resource.h"
  14
  15 struct yaboot_state {
  16         int globals_done;
  17         const char *const *known_names;
  18
  19         /* current option data */
  20         struct discover_boot_option *opt;
  21         const char *device;
  22         const char *partition;
  23         const char *boot_image;
  24         const char *initrd;
  25         const char *initrd_size;
  26         const char *literal;
  27         const char *ramdisk;
  28         const char *root;
  29         bool read_only;
  30         bool read_write;
  31 };
  32
  33 static struct discover_boot_option *state_start_new_option(
  34                 struct conf_context *conf,
  35                 struct yaboot_state *state)
  36 {
  37         state->opt = discover_boot_option_create(conf->dc, conf->dc->device);
  38         state->opt->option->boot_args = talloc_strdup(state->opt->option, "");
  39
  40         /* old allocated values will get freed with the state */
  41         state->device = conf_get_global_option(conf, "device");
  42         state->partition = conf_get_global_option(conf, "partition");
  43         state->initrd_size = conf_get_global_option(conf, "initrd_size");
  44         state->literal = conf_get_global_option(conf, "literal");
  45         state->ramdisk = conf_get_global_option(conf, "ramdisk");
  46         state->root = conf_get_global_option(conf, "root");
  47
  48         return state->opt;
  49 }
  50
  51 static struct resource *create_yaboot_devpath_resource(
  52                 struct yaboot_state *state,
  53                 struct conf_context *conf,
  54                 const char *path)
  55 {
  56         struct discover_boot_option *opt = state->opt;
  57         const char *dev, *part, *devpos;
  58         struct resource *res;
  59         char *devpath, *devstr;
  60
  61         dev = state->device;
  62         part = state->partition;
  63
  64         if (!dev)
  65                 dev = conf_get_global_option(conf, "device");
  66         if (!part)
  67                 part = conf_get_global_option(conf, "partition");
  68
  69         if (strchr(path, ':')) {
  70                 devpath = talloc_strdup(conf, path);
  71
  72         } else if (dev && part) {
  73                 devpos = &dev[strlen(dev) - 1];
  74                 if (isdigit(*devpos)) {
  75                         while (isdigit(*devpos))
  76                                 devpos--;
  77
  78                         devstr = talloc_strndup(conf, dev, devpos - dev + 1);
  79                         devpath = talloc_asprintf(conf, "%s%s:%s", devstr,
  80                                         part, path);
  81                         talloc_free(devstr);
  82                 } else {
  83                         devpath = talloc_asprintf(conf,
  84                                         "%s%s:%s", dev, part, path);
  85                 }
  86         } else if (dev) {
  87                 devpath = talloc_asprintf(conf, "%s:%s", dev, path);
  88         } else {
  89                 devpath = talloc_strdup(conf, path);
  90         }
  91
  92         res = create_devpath_resource(opt, conf->dc->device, devpath);
  93
  94         talloc_free(devpath);
  95
  96         return res;
  97 }
  98
  99 static void yaboot_finish(struct conf_context *conf)
 100 {
 101         struct yaboot_state *state = conf->parser_info;
 102         const char *default_label;
 103         struct boot_option *opt;
 104
 105         if (!state->opt)
 106                 return;
 107
 108         opt = state->opt->option;
 109         assert(opt);
 110         assert(opt->name);
 111         assert(opt->boot_args);
 112
 113         /* populate the boot option from state data */
 114         state->opt->boot_image = create_yaboot_devpath_resource(state,
 115                                 conf, state->boot_image);
 116         if (state->initrd) {
 117                 state->opt->initrd = create_yaboot_devpath_resource(state,
 118                                 conf, state->initrd);
 119         }
 120
 121         if (state->initrd_size) {
 122                 opt->boot_args = talloc_asprintf(opt, "ramdisk_size=%s %s",
 123                                         state->initrd_size, opt->boot_args);
 124         }
 125
 126         if (state->ramdisk) {
 127                 opt->boot_args = talloc_asprintf(opt, "ramdisk=%s %s",
 128                                         state->initrd_size, opt->boot_args);
 129         }
 130
 131         if (state->root) {
 132                 opt->boot_args = talloc_asprintf(opt, "root=%s %s",
 133                                         state->root, opt->boot_args);
 134         }
 135
 136         if (state->read_only && state->read_write) {
 137                 pb_log("boot option %s specified both 'ro' and 'rw', "
 138                                 "using 'rw'\n", opt->name);
 139                 state->read_only = false;
 140         }
 141
 142         if (state->read_only || state->read_write) {
 143                 opt->boot_args = talloc_asprintf(opt, "%s %s",
 144                                         state->read_only ? "ro" : "rw",
 145                                         opt->boot_args);
 146         }
 147
 148         if (state->literal) {
 149                 opt->boot_args = talloc_strdup(opt, state->literal);
 150         }
 151
 152         opt->description = talloc_asprintf(opt, "%s %s %s",
 153                 state->boot_image,
 154                 (state->initrd ? state->initrd : ""),
 155                 opt->boot_args ? opt->boot_args : "");
 156
 157         conf_strip_str(opt->boot_args);
 158         conf_strip_str(opt->description);
 159
 160         default_label = conf_get_global_option(conf, "default");
 161         if (default_label &&
 162                         !strcasecmp(state->opt->option->name, default_label))
 163                 state->opt->option->is_default = true;
 164
 165         discover_context_add_boot_option(conf->dc, state->opt);
 166 }
 167
 168 static void yaboot_process_pair(struct conf_context *conf, const char *name,
 169                 char *value)
 170 {
 171         struct yaboot_state *state = conf->parser_info;
 172         struct discover_boot_option *opt = state->opt;
 173         struct fixed_pair {
 174                 const char *image;
 175                 const char *initrd;
 176         };
 177         static const struct fixed_pair suse_fp32 = {
 178                 .image = "/suseboot/vmlinux32",
 179                 .initrd = "/suseboot/initrd32",
 180         };
 181         static const struct fixed_pair suse_fp64 = {
 182                 .image = "/suseboot/vmlinux64",
 183                 .initrd = "/suseboot/initrd64",
 184         };
 185         const struct fixed_pair *suse_fp;
 186
 187         /* fixup for bare values */
 188
 189         if (!name)
 190                 name = value;
 191
 192         if (!state->globals_done && conf_set_global_option(conf, name, value))
 193                 return;
 194
 195         if (!conf_param_in_list(state->known_names, name))
 196                 return;
 197
 198         state->globals_done = 1;
 199
 200         /* image */
 201
 202         if (streq(name, "image")) {
 203
 204                 /* First finish any previous image. */
 205                 if (opt)
 206                         yaboot_finish(conf);
 207
 208                 /* Then start the new image. */
 209                 opt = state_start_new_option(conf, state);
 210
 211                 state->boot_image = talloc_strdup(state, value);
 212
 213                 return;
 214         }
 215
 216         /* Special processing for SUSE install CD. */
 217
 218         if (streq(name, "image[32bit]"))
 219                 suse_fp = &suse_fp32;
 220         else if (streq(name, "image[64bit]"))
 221                 suse_fp = &suse_fp64;
 222         else
 223                 suse_fp = NULL;
 224
 225         if (suse_fp) {
 226                 /* First finish any previous image. */
 227                 if (opt)
 228                         yaboot_finish(conf);
 229
 230                 /* Then start the new image. */
 231                 opt = state_start_new_option(conf, state);
 232
 233                 if (*value == '/') {
 234                         state->boot_image = talloc_strdup(state, value);
 235                 } else {
 236                         state->boot_image = talloc_strdup(state,
 237                                                         suse_fp->image);
 238                         state->initrd = talloc_strdup(state, suse_fp->initrd);
 239                 }
 240
 241                 return;
 242         }
 243
 244         /* all other processing requires an image */
 245         if (!opt) {
 246                 pb_log("%s: unknown name: %s\n", __func__, name);
 247                 return;
 248         }
 249
 250         /* initrd */
 251         if (streq(name, "initrd")) {
 252                 state->initrd = talloc_strdup(state, value);
 253                 return;
 254         }
 255
 256         /* label */
 257         if (streq(name, "label")) {
 258                 opt->option->id = talloc_asprintf(opt->option, "%s#%s",
 259                         conf->dc->device->device->id, value);
 260                 opt->option->name = talloc_strdup(opt->option, value);
 261                 return;
 262         }
 263
 264         /* args */
 265         if (streq(name, "device")) {
 266                 printf("option device : %s", value);
 267                 state->device = talloc_strdup(state, value);
 268                 return;
 269         }
 270
 271         if (streq(name, "parititon")) {
 272                 state->partition = talloc_strdup(state, value);
 273                 return;
 274         }
 275
 276         if (streq(name, "append")) {
 277                 opt->option->boot_args = talloc_asprintf_append(
 278                         opt->option->boot_args, "%s ", value);
 279                 return;
 280         }
 281
 282         if (streq(name, "initrd-size")) {
 283                 state->initrd_size = talloc_strdup(state, value);
 284                 return;
 285         }
 286
 287         if (streq(name, "literal")) {
 288                 state->literal = talloc_strdup(state, value);
 289                 return;
 290         }
 291
 292         if (streq(name, "ramdisk")) {
 293                 state->ramdisk = talloc_strdup(state, value);
 294                 return;
 295         }
 296
 297         if (streq(name, "read-only")) {
 298                 state->read_only = true;
 299                 return;
 300         }
 301
 302         if (streq(name, "read-write")) {
 303                 state->read_write = true;
 304                 return;
 305         }
 306
 307         if (streq(name, "root")) {
 308                 state->root = talloc_strdup(state, value);
 309                 return;
 310         }
 311
 312         pb_log("%s: unknown name: %s\n", __func__, name);
 313 }
 314
 315 static struct conf_global_option yaboot_global_options[] = {
 316         { .name = "root" },
 317         { .name = "device" },
 318         { .name = "partition" },
 319         { .name = "initrd" },
 320         { .name = "initrd_size" },
 321         { .name = "video" },
 322         { .name = "literal" },
 323         { .name = "ramdisk" },
 324         { .name = "default" },
 325         { .name = NULL },
 326 };
 327
 328 static const char *const yaboot_conf_files[] = {
 329         "/yaboot.conf",
 330         "/yaboot.cnf",
 331         "/etc/yaboot.conf",
 332         "/etc/yaboot.cnf",
 333         "/suseboot/yaboot.cnf",
 334         "/YABOOT.CONF",
 335         "/YABOOT.CNF",
 336         "/ETC/YABOOT.CONF",
 337         "/ETC/YABOOT.CNF",
 338         "/SUSEBOOT/YABOOT.CNF",
 339         NULL
 340 };
 341
 342 static const char *yaboot_known_names[] = {
 343         "append",
 344         "image",
 345         "image[64bit]", /* SUSE extension */
 346         "image[32bit]", /* SUSE extension */
 347         "initrd",
 348         "initrd-size",
 349         "label",
 350         "literal",
 351         "ramdisk",
 352         "read-only",
 353         "read-write",
 354         "root",
 355         "device",
 356         "partition",
 357         NULL
 358 };
 359
 360 static int yaboot_parse(struct discover_context *dc)
 361 {
 362         const char * const *filename;
 363         struct yaboot_state *state;
 364         struct conf_context *conf;
 365         int len, rc;
 366         char *buf;
 367
 368         /* Support block device boot only at present */
 369         if (dc->event)
 370                 return -1;
 371
 372         conf = talloc_zero(dc, struct conf_context);
 373
 374         if (!conf)
 375                 return -1;
 376
 377         conf->dc = dc;
 378         conf->global_options = yaboot_global_options,
 379         conf_init_global_options(conf);
 380         conf->get_pair = conf_get_pair_equal;
 381         conf->process_pair = yaboot_process_pair;
 382         conf->finish = yaboot_finish;
 383         conf->parser_info = state = talloc_zero(conf, struct yaboot_state);
 384
 385         state->known_names = yaboot_known_names;
 386
 387         state->opt = NULL;
 388
 389         for (filename = yaboot_conf_files; *filename; filename++) {
 390                 rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
 391                 if (rc)
 392                         continue;
 393
 394                 conf_parse_buf(conf, buf, len);
 395                 talloc_free(buf);
 396         }
 397
 398         talloc_free(conf);
 399         return 0;
 400 }
 401
 402 static struct parser yaboot_parser = {
 403         .name                   = "yaboot",
 404         .parse                  = yaboot_parse,
 405         .resolve_resource       = resolve_devpath_resource,
 406 };
 407
 408 register_parser(yaboot_parser);