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 #include <i18n/i18n.h>
  10
  11 #include "log/log.h"
  12 #include "talloc/talloc.h"
  13 #include "types/types.h"
  14 #include "parser-conf.h"
  15 #include "parser-utils.h"
  16 #include "resource.h"
  17
  18 struct yaboot_state {
  19         int globals_done;
  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
 119         char* args_sigfile_default = talloc_asprintf(opt,
 120                 "%s.cmdline.sig", state->boot_image);
 121         state->opt->args_sig_file = create_yaboot_devpath_resource(state,
 122                                 conf, args_sigfile_default);
 123         talloc_free(args_sigfile_default);
 124
 125         if (state->initrd) {
 126                 state->opt->initrd = create_yaboot_devpath_resource(state,
 127                                 conf, state->initrd);
 128         }
 129
 130         if (state->initrd_size) {
 131                 opt->boot_args = talloc_asprintf(opt, "ramdisk_size=%s %s",
 132                                         state->initrd_size, opt->boot_args);
 133         }
 134
 135         if (state->ramdisk) {
 136                 opt->boot_args = talloc_asprintf(opt, "ramdisk=%s %s",
 137                                         state->initrd_size, opt->boot_args);
 138         }
 139
 140         if (state->root) {
 141                 opt->boot_args = talloc_asprintf(opt, "root=%s %s",
 142                                         state->root, opt->boot_args);
 143         }
 144
 145         if (state->read_only && state->read_write) {
 146                 pb_log("boot option %s specified both 'ro' and 'rw', "
 147                                 "using 'rw'\n", opt->name);
 148                 state->read_only = false;
 149         }
 150
 151         if (state->read_only || state->read_write) {
 152                 opt->boot_args = talloc_asprintf(opt, "%s %s",
 153                                         state->read_only ? "ro" : "rw",
 154                                         opt->boot_args);
 155         }
 156
 157         if (state->literal) {
 158                 opt->boot_args = talloc_strdup(opt, state->literal);
 159         }
 160
 161         opt->description = talloc_asprintf(opt, "%s %s %s",
 162                 state->boot_image,
 163                 (state->initrd ? state->initrd : ""),
 164                 opt->boot_args ? opt->boot_args : "");
 165
 166         conf_strip_str(opt->boot_args);
 167         conf_strip_str(opt->description);
 168
 169         default_label = conf_get_global_option(conf, "default");
 170         if (default_label &&
 171                         !strcasecmp(state->opt->option->name, default_label))
 172                 state->opt->option->is_default = true;
 173
 174         discover_context_add_boot_option(conf->dc, state->opt);
 175 }
 176
 177 static void yaboot_process_pair(struct conf_context *conf, const char *name,
 178                 char *value)
 179 {
 180         struct yaboot_state *state = conf->parser_info;
 181         struct discover_boot_option *opt = state->opt;
 182         struct fixed_pair {
 183                 const char *image;
 184                 const char *initrd;
 185         };
 186         static const struct fixed_pair suse_fp32 = {
 187                 .image = "/suseboot/vmlinux32",
 188                 .initrd = "/suseboot/initrd32",
 189         };
 190         static const struct fixed_pair suse_fp64 = {
 191                 .image = "/suseboot/vmlinux64",
 192                 .initrd = "/suseboot/initrd64",
 193         };
 194         const struct fixed_pair *suse_fp;
 195
 196         /* fixup for bare values */
 197
 198         if (!name)
 199                 name = value;
 200
 201         if (!state->globals_done && conf_set_global_option(conf, name, value))
 202                 return;
 203
 204         /* image */
 205         if (streq(name, "image")) {
 206                 /* an image section finishes our global defintions */
 207                 state->globals_done = 1;
 208
 209                 /* First finish any previous image. */
 210                 if (opt)
 211                         yaboot_finish(conf);
 212
 213                 /* Then start the new image. */
 214                 opt = state_start_new_option(conf, state);
 215
 216                 state->boot_image = talloc_strdup(state, value);
 217
 218                 return;
 219         }
 220
 221         /* Special processing for SUSE install CD. */
 222
 223         if (streq(name, "image[32bit]"))
 224                 suse_fp = &suse_fp32;
 225         else if (streq(name, "image[64bit]"))
 226                 suse_fp = &suse_fp64;
 227         else
 228                 suse_fp = NULL;
 229
 230         if (suse_fp) {
 231                 /* First finish any previous image. */
 232                 if (opt)
 233                         yaboot_finish(conf);
 234
 235                 /* Then start the new image. */
 236                 opt = state_start_new_option(conf, state);
 237
 238                 if (*value == '/') {
 239                         state->boot_image = talloc_strdup(state, value);
 240                 } else {
 241                         state->boot_image = talloc_strdup(state,
 242                                                         suse_fp->image);
 243                         state->initrd = talloc_strdup(state, suse_fp->initrd);
 244                 }
 245
 246                 return;
 247         }
 248
 249         /* all other processing requires an image */
 250         if (!opt) {
 251                 pb_debug("%s: unknown name: %s\n", __func__, name);
 252                 return;
 253         }
 254
 255         /* initrd */
 256         if (streq(name, "initrd")) {
 257                 state->initrd = talloc_strdup(state, value);
 258                 return;
 259         }
 260
 261         /* label */
 262         if (streq(name, "label")) {
 263                 opt->option->id = talloc_asprintf(opt->option, "%s#%s",
 264                         conf->dc->device->device->id, value);
 265                 opt->option->name = talloc_strdup(opt->option, value);
 266                 return;
 267         }
 268
 269         /* args */
 270         if (streq(name, "device")) {
 271                 printf("option device : %s", value);
 272                 state->device = talloc_strdup(state, value);
 273                 return;
 274         }
 275
 276         if (streq(name, "parititon")) {
 277                 state->partition = talloc_strdup(state, value);
 278                 return;
 279         }
 280
 281         if (streq(name, "append")) {
 282                 opt->option->boot_args = talloc_asprintf_append(
 283                         opt->option->boot_args, "%s ", value);
 284                 return;
 285         }
 286
 287         if (streq(name, "initrd-size")) {
 288                 state->initrd_size = talloc_strdup(state, value);
 289                 return;
 290         }
 291
 292         if (streq(name, "literal")) {
 293                 state->literal = talloc_strdup(state, value);
 294                 return;
 295         }
 296
 297         if (streq(name, "ramdisk")) {
 298                 state->ramdisk = talloc_strdup(state, value);
 299                 return;
 300         }
 301
 302         if (streq(name, "read-only")) {
 303                 state->read_only = true;
 304                 return;
 305         }
 306
 307         if (streq(name, "read-write")) {
 308                 state->read_write = true;
 309                 return;
 310         }
 311
 312         if (streq(name, "root")) {
 313                 state->root = talloc_strdup(state, value);
 314                 return;
 315         }
 316
 317         pb_debug("%s: unknown name: %s\n", __func__, name);
 318 }
 319
 320 static struct conf_global_option yaboot_global_options[] = {
 321         { .name = "root" },
 322         { .name = "device" },
 323         { .name = "partition" },
 324         { .name = "initrd" },
 325         { .name = "initrd_size" },
 326         { .name = "video" },
 327         { .name = "literal" },
 328         { .name = "ramdisk" },
 329         { .name = "default" },
 330         { .name = NULL },
 331 };
 332
 333 static const char *const yaboot_conf_files[] = {
 334         "/yaboot.conf",
 335         "/yaboot.cnf",
 336         "/etc/lilo.conf",
 337         "/etc/silo.conf",
 338         "/etc/yaboot.conf",
 339         "/etc/yaboot.cnf",
 340         "/suseboot/yaboot.cnf",
 341         "/YABOOT.CONF",
 342         "/YABOOT.CNF",
 343         "/ETC/LILO.CONF",
 344         "/ETC/SILO.CONF",
 345         "/ETC/YABOOT.CONF",
 346         "/ETC/YABOOT.CNF",
 347         "/SUSEBOOT/YABOOT.CNF",
 348         NULL
 349 };
 350
 351 static int yaboot_parse(struct discover_context *dc)
 352 {
 353         const char * const *filename;
 354         struct yaboot_state *state;
 355         struct conf_context *conf;
 356         int len, rc;
 357         char *buf;
 358
 359         /* Support block device boot only at present */
 360         if (dc->event)
 361                 return -1;
 362
 363         conf = talloc_zero(dc, struct conf_context);
 364
 365         if (!conf)
 366                 return -1;
 367
 368         conf->dc = dc;
 369         conf->global_options = yaboot_global_options,
 370         conf_init_global_options(conf);
 371         conf->get_pair = conf_get_pair_equal;
 372         conf->process_pair = yaboot_process_pair;
 373         conf->finish = yaboot_finish;
 374         conf->parser_info = state = talloc_zero(conf, struct yaboot_state);
 375
 376         state->opt = NULL;
 377
 378         for (filename = yaboot_conf_files; *filename; filename++) {
 379                 rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
 380                 if (rc)
 381                         continue;
 382
 383                 conf_parse_buf(conf, buf, len);
 384                 device_handler_status_dev_info(dc->handler, dc->device,
 385                                 _("Parsed yaboot configuration from %s"),
 386                                 *filename);
 387                 talloc_free(buf);
 388         }
 389
 390         talloc_free(conf);
 391         return 0;
 392 }
 393
 394 static struct parser yaboot_parser = {
 395         .name                   = "yaboot",
 396         .parse                  = yaboot_parse,
 397         .resolve_resource       = resolve_devpath_resource,
 398 };
 399
 400 register_parser(yaboot_parser);