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