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         state->opt = NULL;
 176 }
 177
 178 static void yaboot_process_pair(struct conf_context *conf, const char *name,
 179                 char *value)
 180 {
 181         struct yaboot_state *state = conf->parser_info;
 182         struct discover_boot_option *opt = state->opt;
 183         struct fixed_pair {
 184                 const char *image;
 185                 const char *initrd;
 186         };
 187         static const struct fixed_pair suse_fp32 = {
 188                 .image = "/suseboot/vmlinux32",
 189                 .initrd = "/suseboot/initrd32",
 190         };
 191         static const struct fixed_pair suse_fp64 = {
 192                 .image = "/suseboot/vmlinux64",
 193                 .initrd = "/suseboot/initrd64",
 194         };
 195         const struct fixed_pair *suse_fp;
 196
 197         /* fixup for bare values */
 198
 199         if (!name)
 200                 name = value;
 201
 202         if (!state->globals_done && conf_set_global_option(conf, name, value))
 203                 return;
 204
 205         /* image */
 206         if (streq(name, "image")) {
 207                 /* an image section finishes our global defintions */
 208                 state->globals_done = 1;
 209
 210                 /* First finish any previous image. */
 211                 if (opt)
 212                         yaboot_finish(conf);
 213
 214                 /* Then start the new image. */
 215                 opt = state_start_new_option(conf, state);
 216
 217                 state->boot_image = talloc_strdup(state, value);
 218
 219                 return;
 220         }
 221
 222         /* Special processing for SUSE install CD. */
 223
 224         if (streq(name, "image[32bit]"))
 225                 suse_fp = &suse_fp32;
 226         else if (streq(name, "image[64bit]"))
 227                 suse_fp = &suse_fp64;
 228         else
 229                 suse_fp = NULL;
 230
 231         if (suse_fp) {
 232                 /* First finish any previous image. */
 233                 if (opt)
 234                         yaboot_finish(conf);
 235
 236                 /* Then start the new image. */
 237                 opt = state_start_new_option(conf, state);
 238
 239                 if (*value == '/') {
 240                         state->boot_image = talloc_strdup(state, value);
 241                 } else {
 242                         state->boot_image = talloc_strdup(state,
 243                                                         suse_fp->image);
 244                         state->initrd = talloc_strdup(state, suse_fp->initrd);
 245                 }
 246
 247                 return;
 248         }
 249
 250         /* all other processing requires an image */
 251         if (!opt) {
 252                 pb_debug("%s: unknown name: %s\n", __func__, name);
 253                 return;
 254         }
 255
 256         /* initrd */
 257         if (streq(name, "initrd")) {
 258                 state->initrd = talloc_strdup(state, value);
 259                 return;
 260         }
 261
 262         /* label */
 263         if (streq(name, "label")) {
 264                 opt->option->id = talloc_asprintf(opt->option, "%s#%s",
 265                         conf->dc->device->device->id, value);
 266                 opt->option->name = talloc_strdup(opt->option, value);
 267                 return;
 268         }
 269
 270         /* args */
 271         if (streq(name, "device")) {
 272                 printf("option device : %s", value);
 273                 state->device = talloc_strdup(state, value);
 274                 return;
 275         }
 276
 277         if (streq(name, "parititon")) {
 278                 state->partition = talloc_strdup(state, value);
 279                 return;
 280         }
 281
 282         if (streq(name, "append")) {
 283                 opt->option->boot_args = talloc_asprintf_append(
 284                         opt->option->boot_args, "%s ", value);
 285                 return;
 286         }
 287
 288         if (streq(name, "initrd-size")) {
 289                 state->initrd_size = talloc_strdup(state, value);
 290                 return;
 291         }
 292
 293         if (streq(name, "literal")) {
 294                 state->literal = talloc_strdup(state, value);
 295                 return;
 296         }
 297
 298         if (streq(name, "ramdisk")) {
 299                 state->ramdisk = talloc_strdup(state, value);
 300                 return;
 301         }
 302
 303         if (streq(name, "read-only")) {
 304                 state->read_only = true;
 305                 return;
 306         }
 307
 308         if (streq(name, "read-write")) {
 309                 state->read_write = true;
 310                 return;
 311         }
 312
 313         if (streq(name, "root")) {
 314                 state->root = talloc_strdup(state, value);
 315                 return;
 316         }
 317
 318         pb_debug("%s: unknown name: %s\n", __func__, name);
 319 }
 320
 321 static struct conf_global_option yaboot_global_options[] = {
 322         { .name = "root" },
 323         { .name = "device" },
 324         { .name = "partition" },
 325         { .name = "initrd" },
 326         { .name = "initrd_size" },
 327         { .name = "video" },
 328         { .name = "literal" },
 329         { .name = "ramdisk" },
 330         { .name = "default" },
 331         { .name = NULL },
 332 };
 333
 334 static const char *const yaboot_conf_files[] = {
 335         "/yaboot.conf",
 336         "/yaboot.cnf",
 337         "/etc/lilo.conf",
 338         "/etc/silo.conf",
 339         "/etc/yaboot.conf",
 340         "/etc/yaboot.cnf",
 341         "/suseboot/yaboot.cnf",
 342         "/YABOOT.CONF",
 343         "/YABOOT.CNF",
 344         "/ETC/LILO.CONF",
 345         "/ETC/SILO.CONF",
 346         "/ETC/YABOOT.CONF",
 347         "/ETC/YABOOT.CNF",
 348         "/SUSEBOOT/YABOOT.CNF",
 349         NULL
 350 };
 351
 352 static int yaboot_parse(struct discover_context *dc)
 353 {
 354         const char * const *filename;
 355         struct yaboot_state *state;
 356         struct conf_context *conf;
 357         int len, rc;
 358         char *buf;
 359
 360         /* Support block device boot only at present */
 361         if (dc->event)
 362                 return -1;
 363
 364         conf = talloc_zero(dc, struct conf_context);
 365
 366         if (!conf)
 367                 return -1;
 368
 369         conf->dc = dc;
 370         conf->global_options = yaboot_global_options,
 371         conf_init_global_options(conf);
 372         conf->get_pair = conf_get_pair_equal;
 373         conf->process_pair = yaboot_process_pair;
 374         conf->finish = yaboot_finish;
 375         conf->parser_info = state = talloc_zero(conf, struct yaboot_state);
 376
 377         state->opt = NULL;
 378
 379         for (filename = yaboot_conf_files; *filename; filename++) {
 380                 rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
 381                 if (rc)
 382                         continue;
 383
 384                 conf_parse_buf(conf, buf, len);
 385                 device_handler_status_dev_info(dc->handler, dc->device,
 386                                 _("Parsed yaboot configuration from %s"),
 387                                 *filename);
 388                 talloc_free(buf);
 389         }
 390
 391         talloc_free(conf);
 392         return 0;
 393 }
 394
 395 static struct parser yaboot_parser = {
 396         .name                   = "yaboot",
 397         .parse                  = yaboot_parse,
 398         .resolve_resource       = resolve_devpath_resource,
 399 };
 400
 401 register_parser(yaboot_parser);