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