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