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

   1
   2 #include <assert.h>
   3
   4 #include <talloc/talloc.h>
   5
   6 #include <discover/resource.h>
   7 #include <discover/parser.h>
   8 #include <discover/parser-utils.h>
   9
  10 #include "grub2.h"
  11 #include "parser.h"
  12 #include "lexer.h"
  13
  14 static const char *const grub2_conf_files[] = {
  15         "/grub.cfg",
  16         "/menu.lst",
  17         "/grub/grub.cfg",
  18         "/grub2/grub.cfg",
  19         "/grub/menu.lst",
  20         "/boot/grub/grub.cfg",
  21         "/boot/grub2/grub.cfg",
  22         "/boot/grub/menu.lst",
  23         "/GRUB.CFG",
  24         "/MENU.LST",
  25         "/GRUB/GRUB.CFG",
  26         "/GRUB2/GRUB.CFG",
  27         "/GRUB/MENU.LST",
  28         "/BOOT/GRUB/GRUB.CFG",
  29         "/BOOT/GRUB/MENU.LST",
  30         NULL
  31 };
  32
  33 struct grub2_resource_info {
  34         struct grub2_root *root;
  35         char *path;
  36 };
  37
  38 /* we use slightly different resources for grub2 */
  39 struct resource *create_grub2_resource(void *ctx,
  40                 struct discover_device *orig_device,
  41                 struct grub2_root *root, const char *path)
  42 {
  43         struct grub2_resource_info *info;
  44         struct resource *res;
  45
  46         res = talloc(ctx, struct resource);
  47
  48         if (root) {
  49                 info = talloc(res, struct grub2_resource_info);
  50                 info->root = root;
  51                 talloc_reference(info, root);
  52                 info->path = talloc_strdup(info, path);
  53
  54                 res->resolved = false;
  55                 res->info = info;
  56
  57         } else
  58                 resolve_resource_against_device(res, orig_device, path);
  59
  60         return res;
  61 }
  62
  63 bool resolve_grub2_resource(struct device_handler *handler,
  64                 struct resource *res)
  65 {
  66         struct grub2_resource_info *info = res->info;
  67         struct discover_device *dev;
  68
  69         assert(!res->resolved);
  70
  71         dev = device_lookup_by_uuid(handler, info->root->uuid);
  72
  73         if (!dev)
  74                 return false;
  75
  76         resolve_resource_against_device(res, dev, info->path);
  77         talloc_free(info);
  78
  79         return true;
  80 }
  81
  82 static int grub2_parse(struct discover_context *dc, char *buf, int len)
  83 {
  84         struct grub2_parser *parser;
  85
  86         parser = grub2_parser_create(dc);
  87
  88         grub2_parser_parse(parser, buf, len);
  89
  90         talloc_free(parser);
  91
  92         return 1;
  93 }
  94
  95 static struct parser grub2_parser = {
  96         .name                   = "grub2",
  97         .method                 = CONF_METHOD_LOCAL_FILE,
  98         .parse                  = grub2_parse,
  99         .filenames              = grub2_conf_files,
 100         .resolve_resource       = resolve_grub2_resource,
 101 };
 102
 103 register_parser(grub2_parser);