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         struct boot_option *opt;
  91
  92         assert(state->opt);
  93
  94         opt = state->opt->option;
  95         assert(opt);
  96         assert(opt->name);
  97         assert(opt->boot_args);
  98
  99         /* populate the boot option from state data */
 100         state->opt->boot_image = create_yaboot_devpath_resource(state,
 101                                 conf, state->boot_image);
 102         if (state->initrd) {
 103                 state->opt->initrd = create_yaboot_devpath_resource(state,
 104                                 conf, state->initrd);
 105         }
 106
 107         if (state->initrd_size) {
 108                 opt->boot_args = talloc_asprintf(opt, "ramdisk_size=%s %s",
 109                                         state->initrd_size, opt->boot_args);
 110         }
 111
 112         if (state->ramdisk) {
 113                 opt->boot_args = talloc_asprintf(opt, "ramdisk=%s %s",
 114                                         state->initrd_size, opt->boot_args);
 115         }
 116
 117         if (state->root) {
 118                 opt->boot_args = talloc_asprintf(opt, "root=%s %s",
 119                                         state->root, opt->boot_args);
 120         }
 121
 122         if (state->read_only && state->read_write) {
 123                 pb_log("boot option %s specified both 'ro' and 'rw', "
 124                                 "using 'rw'\n", opt->name);
 125                 state->read_only = false;
 126         }
 127
 128         if (state->read_only || state->read_write) {
 129                 opt->boot_args = talloc_asprintf(opt, "%s %s",
 130                                         state->read_only ? "ro" : "rw",
 131                                         opt->boot_args);
 132         }
 133
 134         if (state->literal) {
 135                 opt->boot_args = talloc_strdup(opt, state->literal);
 136         }
 137
 138         opt->description = talloc_asprintf(opt, "%s %s %s",
 139                 state->boot_image,
 140                 (state->initrd ? state->initrd : ""),
 141                 opt->boot_args ? opt->boot_args : "");
 142
 143         conf_strip_str(opt->boot_args);
 144         conf_strip_str(opt->description);
 145
 146         discover_context_add_boot_option(conf->dc, state->opt);
 147 }
 148
 149 static void yaboot_process_pair(struct conf_context *conf, const char *name,
 150                 char *value)
 151 {
 152         struct yaboot_state *state = conf->parser_info;
 153         struct discover_boot_option *opt = state->opt;
 154         struct fixed_pair {
 155                 const char *image;
 156                 const char *initrd;
 157         };
 158         static const struct fixed_pair suse_fp32 = {
 159                 .image = "/suseboot/vmlinux32",
 160                 .initrd = "/suseboot/initrd32",
 161         };
 162         static const struct fixed_pair suse_fp64 = {
 163                 .image = "/suseboot/vmlinux64",
 164                 .initrd = "/suseboot/initrd64",
 165         };
 166         const struct fixed_pair *suse_fp;
 167
 168         /* fixup for bare values */
 169
 170         if (!name)
 171                 name = value;
 172
 173         if (!state->globals_done && conf_set_global_option(conf, name, value))
 174                 return;
 175
 176         if (!conf_param_in_list(state->known_names, name))
 177                 return;
 178
 179         state->globals_done = 1;
 180
 181         /* image */
 182
 183         if (streq(name, "image")) {
 184
 185                 /* First finish any previous image. */
 186                 if (opt)
 187                         yaboot_finish(conf);
 188
 189                 /* Then start the new image. */
 190                 opt = state_start_new_option(conf, state);
 191
 192                 state->boot_image = talloc_strdup(state, value);
 193
 194                 return;
 195         }
 196
 197         /* Special processing for SUSE install CD. */
 198
 199         if (streq(name, "image[32bit]"))
 200                 suse_fp = &suse_fp32;
 201         else if (streq(name, "image[64bit]"))
 202                 suse_fp = &suse_fp64;
 203         else
 204                 suse_fp = NULL;
 205
 206         if (suse_fp) {
 207                 /* First finish any previous image. */
 208                 if (opt)
 209                         yaboot_finish(conf);
 210
 211                 /* Then start the new image. */
 212                 opt = state_start_new_option(conf, state);
 213
 214                 if (*value == '/') {
 215                         state->boot_image = talloc_strdup(state, value);
 216                 } else {
 217                         state->boot_image = talloc_strdup(state,
 218                                                         suse_fp->image);
 219                         state->initrd = talloc_strdup(state, suse_fp->initrd);
 220                 }
 221
 222                 return;
 223         }
 224
 225         /* all other processing requires an image */
 226         if (!opt) {
 227                 pb_log("%s: unknown name: %s\n", __func__, name);
 228                 return;
 229         }
 230
 231         /* initrd */
 232         if (streq(name, "initrd")) {
 233                 state->initrd = talloc_strdup(state, value);
 234                 return;
 235         }
 236
 237         /* label */
 238         if (streq(name, "label")) {
 239                 opt->option->id = talloc_asprintf(opt->option, "%s#%s",
 240                         conf->dc->device->device->id, value);
 241                 opt->option->name = talloc_strdup(opt->option, value);
 242                 return;
 243         }
 244
 245         /* args */
 246         if (streq(name, "device")) {
 247                 printf("option device : %s", value);
 248                 state->device = talloc_strdup(state, value);
 249                 return;
 250         }
 251
 252         if (streq(name, "parititon")) {
 253                 state->partition = talloc_strdup(state, value);
 254                 return;
 255         }
 256
 257         if (streq(name, "append")) {
 258                 opt->option->boot_args = talloc_asprintf_append(
 259                         opt->option->boot_args, "%s ", value);
 260                 return;
 261         }
 262
 263         if (streq(name, "initrd-size")) {
 264                 state->initrd_size = talloc_strdup(state, value);
 265                 return;
 266         }
 267
 268         if (streq(name, "literal")) {
 269                 state->literal = talloc_strdup(state, value);
 270                 return;
 271         }
 272
 273         if (streq(name, "ramdisk")) {
 274                 state->ramdisk = talloc_strdup(state, value);
 275                 return;
 276         }
 277
 278         if (streq(name, "read-only")) {
 279                 state->read_only = true;
 280                 return;
 281         }
 282
 283         if (streq(name, "read-write")) {
 284                 state->read_write = true;
 285                 return;
 286         }
 287
 288         if (streq(name, "root")) {
 289                 state->root = talloc_strdup(state, value);
 290                 return;
 291         }
 292
 293         pb_log("%s: unknown name: %s\n", __func__, name);
 294 }
 295
 296 static struct conf_global_option yaboot_global_options[] = {
 297         { .name = "root" },
 298         { .name = "device" },
 299         { .name = "partition" },
 300         { .name = "initrd" },
 301         { .name = "initrd_size" },
 302         { .name = "video" },
 303         { .name = "literal" },
 304         { .name = "ramdisk" },
 305         { .name = NULL },
 306 };
 307
 308 static const char *const yaboot_conf_files[] = {
 309         "/yaboot.conf",
 310         "/yaboot.cnf",
 311         "/etc/yaboot.conf",
 312         "/etc/yaboot.cnf",
 313         "/suseboot/yaboot.cnf",
 314         "/YABOOT.CONF",
 315         "/YABOOT.CNF",
 316         "/ETC/YABOOT.CONF",
 317         "/ETC/YABOOT.CNF",
 318         "/SUSEBOOT/YABOOT.CNF",
 319         NULL
 320 };
 321
 322 static const char *yaboot_known_names[] = {
 323         "append",
 324         "image",
 325         "image[64bit]", /* SUSE extension */
 326         "image[32bit]", /* SUSE extension */
 327         "initrd",
 328         "initrd-size",
 329         "label",
 330         "literal",
 331         "ramdisk",
 332         "read-only",
 333         "read-write",
 334         "root",
 335         "device",
 336         "partition",
 337         NULL
 338 };
 339
 340 static int yaboot_parse(struct discover_context *dc, char *buf, int len)
 341 {
 342         struct conf_context *conf;
 343         struct yaboot_state *state;
 344
 345         conf = talloc_zero(dc, struct conf_context);
 346
 347         if (!conf)
 348                 return 0;
 349
 350         conf->dc = dc;
 351         conf->global_options = yaboot_global_options,
 352         conf_init_global_options(conf);
 353         conf->get_pair = conf_get_pair_equal;
 354         conf->process_pair = yaboot_process_pair;
 355         conf->finish = yaboot_finish;
 356         conf->parser_info = state = talloc_zero(conf, struct yaboot_state);
 357
 358         state->known_names = yaboot_known_names;
 359
 360         state->opt = NULL;
 361
 362         conf_parse_buf(conf, buf, len);
 363
 364         talloc_free(conf);
 365         return 1;
 366 }
 367
 368 static struct parser yaboot_parser = {
 369         .name                   = "yaboot",
 370         .method                 = CONF_METHOD_LOCAL_FILE,
 371         .parse                  = yaboot_parse,
 372         .filenames              = yaboot_conf_files,
 373         .resolve_resource       = resolve_devpath_resource,
 374 };
 375
 376 register_parser(yaboot_parser);