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

   1 #if defined(HAVE_CONFIG_H)
   2 #include "config.h"
   3 #endif
   4
   5 #include <assert.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <ctype.h>
   9
  10 #include "log/log.h"
  11 #include "talloc/talloc.h"
  12 #include "types/types.h"
  13 #include "parser-conf.h"
  14 #include "parser-utils.h"
  15 #include "resource.h"
  16
  17 struct yaboot_state {
  18         int globals_done;
  19         const char *const *known_names;
  20
  21         /* current option data */
  22         struct discover_boot_option *opt;
  23         const char *device;
  24         const char *partition;
  25         const char *boot_image;
  26         const char *initrd;
  27         const char *initrd_size;
  28         const char *literal;
  29         const char *ramdisk;
  30         const char *root;
  31         bool read_only;
  32         bool read_write;
  33 };
  34
  35 static struct discover_boot_option *state_start_new_option(
  36                 struct conf_context *conf,
  37                 struct yaboot_state *state)
  38 {
  39         state->opt = discover_boot_option_create(conf->dc, conf->dc->device);
  40         state->opt->option->boot_args = talloc_strdup(state->opt->option, "");
  41
  42         /* old allocated values will get freed with the state */
  43         state->device = conf_get_global_option(conf, "device");
  44         state->partition = conf_get_global_option(conf, "partition");
  45         state->initrd_size = conf_get_global_option(conf, "initrd_size");
  46         state->literal = conf_get_global_option(conf, "literal");
  47         state->ramdisk = conf_get_global_option(conf, "ramdisk");
  48         state->root = conf_get_global_option(conf, "root");
  49
  50         return state->opt;
  51 }
  52
  53 static struct resource *create_yaboot_devpath_resource(
  54                 struct yaboot_state *state,
  55                 struct conf_context *conf,
  56                 const char *path)
  57 {
  58         struct discover_boot_option *opt = state->opt;
  59         const char *dev, *part, *devpos;
  60         struct resource *res;
  61         char *devpath, *devstr;
  62
  63         dev = state->device;
  64         part = state->partition;
  65
  66         if (!dev)
  67                 dev = conf_get_global_option(conf, "device");
  68         if (!part)
  69                 part = conf_get_global_option(conf, "partition");
  70
  71         if (strchr(path, ':')) {
  72                 devpath = talloc_strdup(conf, path);
  73
  74         } else if (dev && part) {
  75                 devpos = &dev[strlen(dev) - 1];
  76                 if (isdigit(*devpos)) {
  77                         while (isdigit(*devpos))
  78                                 devpos--;
  79
  80                         devstr = talloc_strndup(conf, dev, devpos - dev + 1);
  81                         devpath = talloc_asprintf(conf, "%s%s:%s", devstr,
  82                                         part, path);
  83                         talloc_free(devstr);
  84                 } else {
  85                         devpath = talloc_asprintf(conf,
  86                                         "%s%s:%s", dev, part, path);
  87                 }
  88         } else if (dev) {
  89                 devpath = talloc_asprintf(conf, "%s:%s", dev, path);
  90         } else {
  91                 devpath = talloc_strdup(conf, path);
  92         }
  93
  94         res = create_devpath_resource(opt, conf->dc->device, devpath);
  95
  96         talloc_free(devpath);
  97
  98         return res;
  99 }
 100
 101 static void yaboot_finish(struct conf_context *conf)
 102 {
 103         struct yaboot_state *state = conf->parser_info;
 104         const char *default_label;
 105         struct boot_option *opt;
 106
 107         if (!state->opt)
 108                 return;
 109
 110         opt = state->opt->option;
 111         assert(opt);
 112         assert(opt->name);
 113         assert(opt->boot_args);
 114
 115         /* populate the boot option from state data */
 116         state->opt->boot_image = create_yaboot_devpath_resource(state,
 117                                 conf, state->boot_image);
 118         if (state->initrd) {
 119                 state->opt->initrd = create_yaboot_devpath_resource(state,
 120                                 conf, state->initrd);
 121         }
 122
 123         if (state->initrd_size) {
 124                 opt->boot_args = talloc_asprintf(opt, "ramdisk_size=%s %s",
 125                                         state->initrd_size, opt->boot_args);
 126         }
 127
 128         if (state->ramdisk) {
 129                 opt->boot_args = talloc_asprintf(opt, "ramdisk=%s %s",
 130                                         state->initrd_size, opt->boot_args);
 131         }
 132
 133         if (state->root) {
 134                 opt->boot_args = talloc_asprintf(opt, "root=%s %s",
 135                                         state->root, opt->boot_args);
 136         }
 137
 138         if (state->read_only && state->read_write) {
 139                 pb_log("boot option %s specified both 'ro' and 'rw', "
 140                                 "using 'rw'\n", opt->name);
 141                 state->read_only = false;
 142         }
 143
 144         if (state->read_only || state->read_write) {
 145                 opt->boot_args = talloc_asprintf(opt, "%s %s",
 146                                         state->read_only ? "ro" : "rw",
 147                                         opt->boot_args);
 148         }
 149
 150         if (state->literal) {
 151                 opt->boot_args = talloc_strdup(opt, state->literal);
 152         }
 153
 154         opt->description = talloc_asprintf(opt, "%s %s %s",
 155                 state->boot_image,
 156                 (state->initrd ? state->initrd : ""),
 157                 opt->boot_args ? opt->boot_args : "");
 158
 159         conf_strip_str(opt->boot_args);
 160         conf_strip_str(opt->description);
 161
 162         default_label = conf_get_global_option(conf, "default");
 163         if (default_label &&
 164                         !strcasecmp(state->opt->option->name, default_label))
 165                 state->opt->option->is_default = true;
 166
 167         discover_context_add_boot_option(conf->dc, state->opt);
 168 }
 169
 170 static void yaboot_process_pair(struct conf_context *conf, const char *name,
 171                 char *value)
 172 {
 173         struct yaboot_state *state = conf->parser_info;
 174         struct discover_boot_option *opt = state->opt;
 175         struct fixed_pair {
 176                 const char *image;
 177                 const char *initrd;
 178         };
 179         static const struct fixed_pair suse_fp32 = {
 180                 .image = "/suseboot/vmlinux32",
 181                 .initrd = "/suseboot/initrd32",
 182         };
 183         static const struct fixed_pair suse_fp64 = {
 184                 .image = "/suseboot/vmlinux64",
 185                 .initrd = "/suseboot/initrd64",
 186         };
 187         const struct fixed_pair *suse_fp;
 188
 189         /* fixup for bare values */
 190
 191         if (!name)
 192                 name = value;
 193
 194         if (!state->globals_done && conf_set_global_option(conf, name, value))
 195                 return;
 196
 197         if (!conf_param_in_list(state->known_names, name))
 198                 return;
 199
 200         state->globals_done = 1;
 201
 202         /* image */
 203
 204         if (streq(name, "image")) {
 205
 206                 /* First finish any previous image. */
 207                 if (opt)
 208                         yaboot_finish(conf);
 209
 210                 /* Then start the new image. */
 211                 opt = state_start_new_option(conf, state);
 212
 213                 state->boot_image = talloc_strdup(state, value);
 214
 215                 return;
 216         }
 217
 218         /* Special processing for SUSE install CD. */
 219
 220         if (streq(name, "image[32bit]"))
 221                 suse_fp = &suse_fp32;
 222         else if (streq(name, "image[64bit]"))
 223                 suse_fp = &suse_fp64;
 224         else
 225                 suse_fp = NULL;
 226
 227         if (suse_fp) {
 228                 /* First finish any previous image. */
 229                 if (opt)
 230                         yaboot_finish(conf);
 231
 232                 /* Then start the new image. */
 233                 opt = state_start_new_option(conf, state);
 234
 235                 if (*value == '/') {
 236                         state->boot_image = talloc_strdup(state, value);
 237                 } else {
 238                         state->boot_image = talloc_strdup(state,
 239                                                         suse_fp->image);
 240                         state->initrd = talloc_strdup(state, suse_fp->initrd);
 241                 }
 242
 243                 return;
 244         }
 245
 246         /* all other processing requires an image */
 247         if (!opt) {
 248                 pb_log("%s: unknown name: %s\n", __func__, name);
 249                 return;
 250         }
 251
 252         /* initrd */
 253         if (streq(name, "initrd")) {
 254                 state->initrd = talloc_strdup(state, value);
 255                 return;
 256         }
 257
 258         /* label */
 259         if (streq(name, "label")) {
 260                 opt->option->id = talloc_asprintf(opt->option, "%s#%s",
 261                         conf->dc->device->device->id, value);
 262                 opt->option->name = talloc_strdup(opt->option, value);
 263                 return;
 264         }
 265
 266         /* args */
 267         if (streq(name, "device")) {
 268                 printf("option device : %s", value);
 269                 state->device = talloc_strdup(state, value);
 270                 return;
 271         }
 272
 273         if (streq(name, "parititon")) {
 274                 state->partition = talloc_strdup(state, value);
 275                 return;
 276         }
 277
 278         if (streq(name, "append")) {
 279                 opt->option->boot_args = talloc_asprintf_append(
 280                         opt->option->boot_args, "%s ", value);
 281                 return;
 282         }
 283
 284         if (streq(name, "initrd-size")) {
 285                 state->initrd_size = talloc_strdup(state, value);
 286                 return;
 287         }
 288
 289         if (streq(name, "literal")) {
 290                 state->literal = talloc_strdup(state, value);
 291                 return;
 292         }
 293
 294         if (streq(name, "ramdisk")) {
 295                 state->ramdisk = talloc_strdup(state, value);
 296                 return;
 297         }
 298
 299         if (streq(name, "read-only")) {
 300                 state->read_only = true;
 301                 return;
 302         }
 303
 304         if (streq(name, "read-write")) {
 305                 state->read_write = true;
 306                 return;
 307         }
 308
 309         if (streq(name, "root")) {
 310                 state->root = talloc_strdup(state, value);
 311                 return;
 312         }
 313
 314         pb_log("%s: unknown name: %s\n", __func__, name);
 315 }
 316
 317 static struct conf_global_option yaboot_global_options[] = {
 318         { .name = "root" },
 319         { .name = "device" },
 320         { .name = "partition" },
 321         { .name = "initrd" },
 322         { .name = "initrd_size" },
 323         { .name = "video" },
 324         { .name = "literal" },
 325         { .name = "ramdisk" },
 326         { .name = "default" },
 327         { .name = NULL },
 328 };
 329
 330 static const char *const yaboot_conf_files[] = {
 331         "/yaboot.conf",
 332         "/yaboot.cnf",
 333         "/etc/yaboot.conf",
 334         "/etc/yaboot.cnf",
 335         "/suseboot/yaboot.cnf",
 336         "/YABOOT.CONF",
 337         "/YABOOT.CNF",
 338         "/ETC/YABOOT.CONF",
 339         "/ETC/YABOOT.CNF",
 340         "/SUSEBOOT/YABOOT.CNF",
 341         NULL
 342 };
 343
 344 static const char *yaboot_known_names[] = {
 345         "append",
 346         "image",
 347         "image[64bit]", /* SUSE extension */
 348         "image[32bit]", /* SUSE extension */
 349         "initrd",
 350         "initrd-size",
 351         "label",
 352         "literal",
 353         "ramdisk",
 354         "read-only",
 355         "read-write",
 356         "root",
 357         "device",
 358         "partition",
 359         NULL
 360 };
 361
 362 static int yaboot_parse(struct discover_context *dc)
 363 {
 364         const char * const *filename;
 365         struct yaboot_state *state;
 366         struct conf_context *conf;
 367         int len, rc;
 368         char *buf;
 369
 370         /* Support block device boot only at present */
 371         if (dc->event)
 372                 return -1;
 373
 374         conf = talloc_zero(dc, struct conf_context);
 375
 376         if (!conf)
 377                 return -1;
 378
 379         conf->dc = dc;
 380         conf->global_options = yaboot_global_options,
 381         conf_init_global_options(conf);
 382         conf->get_pair = conf_get_pair_equal;
 383         conf->process_pair = yaboot_process_pair;
 384         conf->finish = yaboot_finish;
 385         conf->parser_info = state = talloc_zero(conf, struct yaboot_state);
 386
 387         state->known_names = yaboot_known_names;
 388
 389         state->opt = NULL;
 390
 391         for (filename = yaboot_conf_files; *filename; filename++) {
 392                 rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
 393                 if (rc)
 394                         continue;
 395
 396                 conf_parse_buf(conf, buf, len);
 397                 talloc_free(buf);
 398         }
 399
 400         talloc_free(conf);
 401         return 0;
 402 }
 403
 404 static struct parser yaboot_parser = {
 405         .name                   = "yaboot",
 406         .parse                  = yaboot_parse,
 407         .resolve_resource       = resolve_devpath_resource,
 408 };
 409
 410 register_parser(yaboot_parser);