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#include <assert.h>
#include <string.h>
#include <i18n/i18n.h>
#include <talloc/talloc.h>
#include <url/url.h>
#include <discover/resource.h>
#include <discover/parser.h>
#include <discover/parser-utils.h>
#include "grub2.h"
static const char *const grub2_conf_files[] = {
"/grub.cfg",
"/menu.lst",
"/grub/grub.cfg",
"/grub2/grub.cfg",
"/grub/menu.lst",
"/boot/grub/grub.cfg",
"/boot/grub2/grub.cfg",
"/boot/grub/menu.lst",
"/efi/boot/grub.cfg",
"/GRUB.CFG",
"/MENU.LST",
"/GRUB/GRUB.CFG",
"/GRUB2/GRUB.CFG",
"/GRUB/MENU.LST",
"/BOOT/GRUB/GRUB.CFG",
"/BOOT/GRUB/MENU.LST",
"/EFI/BOOT/GRUB.CFG",
NULL
};
struct discover_device *grub2_lookup_device(struct device_handler *handler,
const char *desc)
{
struct discover_device *dev;
if (!desc || !*desc)
return NULL;
dev = device_lookup_by_id(handler, desc);
if (dev)
return dev;
/* for now, only lookup by UUID */
dev = device_lookup_by_uuid(handler, desc);
if (dev)
return dev;
return NULL;
}
/* we use slightly different resources for grub2 */
struct resource *create_grub2_resource(struct grub2_script *script,
struct discover_boot_option *opt,
const char *path)
{
struct discover_device *dev;
struct grub2_file *file;
struct resource *res;
const char *root;
if (strstr(path, "://")) {
struct pb_url *url = pb_url_parse(opt, path);
if (url)
return create_url_resource(opt, url);
}
file = grub2_parse_file(script, path);
if (!file)
return NULL;
res = talloc(opt, struct resource);
root = script_env_get(script, "root");
if (!file->dev && root && strlen(root))
file->dev = talloc_strdup(file, root);
/* if we don't have a device specified, or the lookup succeeds now,
* then we can resolve the resource right away */
if (file->dev)
dev = grub2_lookup_device(script->ctx->handler, file->dev);
else
dev = script->ctx->device;
if (dev) {
resolve_resource_against_device(res, dev, file->path);
} else {
res->resolved = false;
res->info = talloc_steal(opt, file);
}
return res;
}
bool resolve_grub2_resource(struct device_handler *handler,
struct resource *res)
{
struct grub2_file *file = res->info;
struct discover_device *dev;
assert(!res->resolved);
dev = grub2_lookup_device(handler, file->dev);
if (!dev)
return false;
resolve_resource_against_device(res, dev, file->path);
talloc_free(file);
return true;
}
struct grub2_file *grub2_parse_file(struct grub2_script *script,
const char *str)
{
struct grub2_file *file;
size_t dev_len;
char *pos;
if (!str)
return NULL;
file = talloc_zero(script, struct grub2_file);
if (*str != '(') {
/* just a path - no device, return path as-is */
file->path = talloc_strdup(file, str);
} else {
/* device plus path - split into components */
pos = strchr(str, ')');
/* no closing bracket, or zero-length path? */
if (!pos || *(pos+1) == '\0') {
talloc_free(file);
return NULL;
}
file->path = talloc_strdup(file, pos + 1);
dev_len = pos - str - 1;
if (dev_len)
file->dev = talloc_strndup(file, str + 1, dev_len);
}
return file;
}
static int grub2_parse(struct discover_context *dc)
{
const char * const *filename;
struct grub2_parser *parser;
int len, rc;
char *buf;
/* Support block device boot only at present */
if (dc->event)
return -1;
for (filename = grub2_conf_files; *filename; filename++) {
rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
if (rc)
continue;
parser = grub2_parser_create(dc);
grub2_parser_parse(parser, *filename, buf, len);
device_handler_status_dev_info(dc->handler, dc->device,
_("Parsed GRUB configuration from %s"),
*filename);
talloc_free(buf);
talloc_free(parser);
break;
}
return 0;
}
static struct parser grub2_parser = {
.name = "grub2",
.parse = grub2_parse,
.resolve_resource = resolve_grub2_resource,
};
register_parser(grub2_parser);
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