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This patch is taken from OpenWrt, see:
https://github.com/openwrt/openwrt/blob/master/package/boot/grub2/patches/100-grub_setup_root.patch.
It allows to use grub-bios-setup on a raw disk-images, without root permissions.
--- a/util/grub-setup.c
+++ b/util/grub-setup.c
@@ -87,6 +87,8 @@ static struct argp_option options[] = {
N_("install even if problems are detected"), 0},
{"skip-fs-probe",'s',0, 0,
N_("do not probe for filesystems in DEVICE"), 0},
+ {"root-device", 'r', N_("DEVICE"), 0,
+ N_("use DEVICE as the root device"), 0},
{"verbose", 'v', 0, 0, N_("print verbose messages."), 0},
{"allow-floppy", 'a', 0, 0,
/* TRANSLATORS: The potential breakage isn't limited to floppies but it's
@@ -130,6 +132,7 @@ struct arguments
char *core_file;
char *dir;
char *dev_map;
+ char *root_dev;
int force;
int fs_probe;
int allow_floppy;
@@ -178,6 +181,13 @@ argp_parser (int key, char *arg, struct
arguments->dev_map = xstrdup (arg);
break;
+ case 'r':
+ if (arguments->root_dev)
+ free (arguments->root_dev);
+
+ arguments->root_dev = xstrdup (arg);
+ break;
+
case 'f':
arguments->force = 1;
break;
@@ -313,7 +323,7 @@ main (int argc, char *argv[])
GRUB_SETUP_FUNC (arguments.dir ? : DEFAULT_DIRECTORY,
arguments.boot_file ? : DEFAULT_BOOT_FILE,
arguments.core_file ? : DEFAULT_CORE_FILE,
- dest_dev, arguments.force,
+ arguments.root_dev, dest_dev, arguments.force,
arguments.fs_probe, arguments.allow_floppy,
arguments.add_rs_codes);
--- a/util/setup.c
+++ b/util/setup.c
@@ -252,13 +252,12 @@ identify_partmap (grub_disk_t disk __att
void
SETUP (const char *dir,
const char *boot_file, const char *core_file,
- const char *dest, int force,
+ char *root, const char *dest, int force,
int fs_probe, int allow_floppy,
int add_rs_codes __attribute__ ((unused))) /* unused on sparc64 */
{
char *core_path;
char *boot_img, *core_img, *boot_path;
- char *root = 0;
size_t boot_size, core_size;
grub_uint16_t core_sectors;
grub_device_t root_dev = 0, dest_dev, core_dev;
@@ -307,7 +306,10 @@ SETUP (const char *dir,
core_dev = dest_dev;
- {
+ if (root)
+ root_dev = grub_device_open(root);
+
+ if (!root_dev) {
char **root_devices = grub_guess_root_devices (dir);
char **cur;
int found = 0;
@@ -320,6 +322,8 @@ SETUP (const char *dir,
char *drive;
grub_device_t try_dev;
+ if (root_dev)
+ break;
drive = grub_util_get_grub_dev (*cur);
if (!drive)
continue;
--- a/include/grub/util/install.h
+++ b/include/grub/util/install.h
@@ -191,13 +191,13 @@ grub_install_get_image_target (const cha
void
grub_util_bios_setup (const char *dir,
const char *boot_file, const char *core_file,
- const char *dest, int force,
+ char *root, const char *dest, int force,
int fs_probe, int allow_floppy,
int add_rs_codes);
void
grub_util_sparc_setup (const char *dir,
const char *boot_file, const char *core_file,
- const char *dest, int force,
+ char *root, const char *dest, int force,
int fs_probe, int allow_floppy,
int add_rs_codes);
--- a/util/grub-install.c
+++ b/util/grub-install.c
@@ -1712,7 +1712,7 @@ main (int argc, char *argv[])
/* Now perform the installation. */
if (install_bootsector)
grub_util_bios_setup (platdir, "boot.img", "core.img",
- install_drive, force,
+ NULL, install_drive, force,
fs_probe, allow_floppy, add_rs_codes);
break;
}
@@ -1738,7 +1738,7 @@ main (int argc, char *argv[])
/* Now perform the installation. */
if (install_bootsector)
grub_util_sparc_setup (platdir, "boot.img", "core.img",
- install_drive, force,
+ NULL, install_drive, force,
fs_probe, allow_floppy,
0 /* unused */ );
break;
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