diff --git a/util/grub-mkrescue.c b/util/grub-mkrescue.c index b9d16f5ad..1e0e40ca6 100644 --- a/util/grub-mkrescue.c +++ b/util/grub-mkrescue.c @@ -261,7 +261,26 @@ make_image_abs (enum grub_install_plat plat, load_cfg = grub_util_make_temporary_file (); load_cfg_f = grub_util_fopen (load_cfg, "wb"); - fprintf (load_cfg_f, "search --fs-uuid --set=root %s\n", iso_uuid); + /* + * A UEFI bootable media should support file system transposition (e.g. extracting + * an ISO 9660 content to a FAT32 media that was formatted by the user). Therefore, + * for EFI platforms, we search for a specific UUID file rather than a partition UUID. + */ + switch (plat) + { + case GRUB_INSTALL_PLATFORM_I386_EFI: + case GRUB_INSTALL_PLATFORM_X86_64_EFI: + case GRUB_INSTALL_PLATFORM_IA64_EFI: + case GRUB_INSTALL_PLATFORM_ARM_EFI: + case GRUB_INSTALL_PLATFORM_ARM64_EFI: + case GRUB_INSTALL_PLATFORM_RISCV32_EFI: + case GRUB_INSTALL_PLATFORM_RISCV64_EFI: + fprintf (load_cfg_f, "search --set=root --file /.disk/%s.uuid\n", iso_uuid); + break; + default: + fprintf (load_cfg_f, "search --set=root --fs-uuid %s\n", iso_uuid); + break; + } fprintf (load_cfg_f, "set prefix=(${root})/boot/grub\n"); write_part (load_cfg_f, source_dirs[plat]); @@ -745,10 +764,11 @@ main (int argc, char *argv[]) || source_dirs[GRUB_INSTALL_PLATFORM_RISCV32_EFI] || source_dirs[GRUB_INSTALL_PLATFORM_RISCV64_EFI]) { + FILE *f; char *efidir_efi = grub_util_path_concat (2, iso9660_dir, "efi"); char *efidir_efi_boot = grub_util_path_concat (3, iso9660_dir, "efi", "boot"); char *imgname, *img32, *img64, *img_mac = NULL; - char *efiimgfat; + char *efiimgfat, *iso_uuid_file, *diskdir, *diskdir_uuid; grub_install_mkdir_p (efidir_efi_boot); grub_install_push_module ("part_gpt"); @@ -757,37 +777,45 @@ main (int argc, char *argv[]) /* Many modern UEFI systems also have native support for NTFS. */ grub_install_push_module ("ntfs"); + /* Create a '.disk/.uuid' file that can be used to locate the boot media. */ + diskdir = grub_util_path_concat (2, iso9660_dir, ".disk"); + grub_install_mkdir_p (diskdir); + iso_uuid_file = xasprintf ("%s.uuid", iso_uuid); + diskdir_uuid = grub_util_path_concat (2, diskdir, iso_uuid_file); + f = grub_util_fopen (diskdir_uuid, "wb"); + fclose (f); + free (iso_uuid_file); + free (diskdir_uuid); + free (diskdir); + imgname = grub_util_path_concat (2, efidir_efi_boot, "bootia64.efi"); make_image_fwdisk_abs (GRUB_INSTALL_PLATFORM_IA64_EFI, "ia64-efi", imgname); free (imgname); grub_install_push_module ("part_apple"); img64 = grub_util_path_concat (2, efidir_efi_boot, "bootx64.efi"); - make_image_fwdisk_abs (GRUB_INSTALL_PLATFORM_X86_64_EFI, "x86_64-efi", img64); + make_image_abs (GRUB_INSTALL_PLATFORM_X86_64_EFI, "x86_64-efi", img64); grub_install_pop_module (); grub_install_push_module ("part_apple"); img32 = grub_util_path_concat (2, efidir_efi_boot, "bootia32.efi"); - make_image_fwdisk_abs (GRUB_INSTALL_PLATFORM_I386_EFI, "i386-efi", img32); + make_image_abs (GRUB_INSTALL_PLATFORM_I386_EFI, "i386-efi", img32); grub_install_pop_module (); imgname = grub_util_path_concat (2, efidir_efi_boot, "bootarm.efi"); - make_image_fwdisk_abs (GRUB_INSTALL_PLATFORM_ARM_EFI, "arm-efi", imgname); + make_image_abs (GRUB_INSTALL_PLATFORM_ARM_EFI, "arm-efi", imgname); free (imgname); imgname = grub_util_path_concat (2, efidir_efi_boot, "bootaa64.efi"); - make_image_fwdisk_abs (GRUB_INSTALL_PLATFORM_ARM64_EFI, "arm64-efi", - imgname); + make_image_abs (GRUB_INSTALL_PLATFORM_ARM64_EFI, "arm64-efi", imgname); free (imgname); imgname = grub_util_path_concat (2, efidir_efi_boot, "bootriscv32.efi"); - make_image_fwdisk_abs (GRUB_INSTALL_PLATFORM_RISCV32_EFI, "riscv32-efi", - imgname); + make_image_abs (GRUB_INSTALL_PLATFORM_RISCV32_EFI, "riscv32-efi", imgname); free (imgname); imgname = grub_util_path_concat (2, efidir_efi_boot, "bootriscv64.efi"); - make_image_fwdisk_abs (GRUB_INSTALL_PLATFORM_RISCV64_EFI, "riscv64-efi", - imgname); + make_image_abs (GRUB_INSTALL_PLATFORM_RISCV64_EFI, "riscv64-efi", imgname); free (imgname); if (source_dirs[GRUB_INSTALL_PLATFORM_I386_EFI])