git.ozlabs.org Git - petitboot/blob - discover/grub2-parser.c

   1 /*
   2  *  Copyright Geoff Levand <geoff@infradead.org>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; version 2 of the License.
   7  *
   8  *  This program is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *  GNU General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License
  14  *  along with this program; if not, write to the Free Software
  15  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #if defined(HAVE_CONFIG_H)
  19 #include "config.h"
  20 #endif
  21
  22 #define _GNU_SOURCE
  23
  24 #include <assert.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "log/log.h"
  29 #include "talloc/talloc.h"
  30 #include "types/types.h"
  31 #include "parser-conf.h"
  32 #include "parser-utils.h"
  33 #include "paths.h"
  34
  35 struct grub2_state {
  36         struct boot_option *opt;
  37         char *desc_image;
  38         char *desc_initrd;
  39         const char *const *known_names;
  40 };
  41
  42 static void grub2_finish(struct conf_context *conf)
  43 {
  44         struct grub2_state *state = conf->parser_info;
  45
  46         if (!state->desc_image) {
  47                 pb_log("%s: %s: no image found\n", __func__,
  48                         conf->dc->device->id);
  49                 return;
  50         }
  51
  52         assert(state->opt);
  53         assert(state->opt->name);
  54         assert(state->opt->boot_args);
  55
  56         state->opt->description = talloc_asprintf(state->opt, "%s %s %s",
  57                 state->desc_image,
  58                 (state->desc_initrd ? state->desc_initrd : ""),
  59                 state->opt->boot_args);
  60
  61         talloc_free(state->desc_initrd);
  62         state->desc_initrd = NULL;
  63
  64         conf_strip_str(state->opt->boot_args);
  65         conf_strip_str(state->opt->description);
  66
  67         /* opt is persistent, so must be associated with device */
  68
  69         device_add_boot_option(conf->dc->device, state->opt);
  70         state->opt = talloc_zero(conf->dc->device, struct boot_option);
  71         state->opt->boot_args = talloc_strdup(state->opt, "");
  72
  73         talloc_free(state->desc_image);
  74         state->desc_image = NULL;
  75 }
  76
  77 static void grub2_process_pair(struct conf_context *conf, const char *name,
  78                 char *value)
  79 {
  80         struct grub2_state *state = conf->parser_info;
  81
  82         if (!name || !conf_param_in_list(state->known_names, name))
  83                 return;
  84
  85         if (streq(name, "menuentry")) {
  86                 char *sep;
  87
  88                 grub2_finish(conf);
  89
  90                 /* Then start the new image. */
  91
  92                 sep = strchr(value, '\'');
  93
  94                 if (sep)
  95                         *sep = 0;
  96
  97                 state->opt->id = talloc_asprintf(state->opt, "%s#%s",
  98                         conf->dc->device->id, value);
  99                 state->opt->name = talloc_strdup(state->opt, value);
 100
 101                 return;
 102         }
 103
 104         if (streq(name, "linux")) {
 105                 char *sep;
 106
 107                 sep = strchr(value, ' ');
 108
 109                 if (sep)
 110                         *sep = 0;
 111
 112                 state->opt->boot_image_file = resolve_path(state->opt,
 113                         value, conf->dc->device_path);
 114                 state->desc_image = talloc_strdup(state->opt, value);
 115
 116                 if (sep)
 117                         state->opt->boot_args = talloc_strdup(state->opt,
 118                                 sep + 1);
 119
 120                 return;
 121         }
 122
 123         if (streq(name, "initrd")) {
 124                 state->opt->initrd_file = resolve_path(state->opt,
 125                         value, conf->dc->device_path);
 126                 state->desc_initrd = talloc_asprintf(state, "initrd=%s",
 127                         value);
 128                 return;
 129         }
 130
 131         pb_log("%s: unknown name: %s\n", __func__, name);
 132 }
 133
 134 static const char *const grub2_conf_files[] = {
 135         "/grub.cfg",
 136         "/menu.lst",
 137         "/grub/grub.cfg",
 138         "/grub/menu.lst",
 139         "/boot/grub/grub.cfg",
 140         "/boot/grub/menu.lst",
 141         "/GRUB.CFG",
 142         "/MENU.LST",
 143         "/GRUB/GRUB.CFG",
 144         "/GRUB/MENU.LST",
 145         "/BOOT/GRUB/GRUB.CFG",
 146         "/BOOT/GRUB/MENU.LST",
 147         NULL
 148 };
 149
 150 static const char *grub2_known_names[] = {
 151         "menuentry",
 152         "linux",
 153         "initrd",
 154         NULL
 155 };
 156
 157 static int grub2_parse(struct discover_context *dc)
 158 {
 159         struct conf_context *conf;
 160         struct grub2_state *state;
 161         int rc;
 162
 163         conf = talloc_zero(dc, struct conf_context);
 164
 165         if (!conf)
 166                 return 0;
 167
 168         conf->dc = dc;
 169         conf_init_global_options(conf);
 170         conf->conf_files = grub2_conf_files,
 171         conf->get_pair = conf_get_pair_space;
 172         conf->process_pair = grub2_process_pair;
 173         conf->finish = grub2_finish;
 174         conf->parser_info = state = talloc_zero(conf, struct grub2_state);
 175
 176         state->known_names = grub2_known_names;
 177
 178         /* opt is persistent, so must be associated with device */
 179
 180         state->opt = talloc_zero(conf->dc->device, struct boot_option);
 181         state->opt->boot_args = talloc_strdup(state->opt, "");
 182
 183         rc = conf_parse(conf);
 184
 185         talloc_free(conf);
 186         return rc;
 187 }
 188
 189 define_parser(grub2, grub2_parse);