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SUSE:ALP:Source:Standard:0.1
grub2
grub2-add-module-for-boot-loader-interface.patch
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File grub2-add-module-for-boot-loader-interface.patch of Package grub2
[PATCH v1 2/2] Add a module for the Boot Loader Interface Add a new module named boot_loader_interface, which provides a command with the same name. It implements a small but quite useful part of the Boot Loader Interface [0]. This interface uses EFI variables for communication between the boot loader and the operating system. This module sets two EFI variables under the vendor GUID 4a67b082-0a4c-41cf-b6c7-440b29bb8c4f: - LoaderInfo: contains GRUB + <version number>. This allows the running operating system to identify the boot loader used during boot. - LoaderDevicePartUUID: contains the partition UUID of the EFI System Partition (ESP). This is used by systemd-gpt-auto-generator [1] to find the root partitions (and others too), via partition type IDs [2]. This module is only available on EFI platforms. [0] https://systemd.io/BOOT_LOADER_INTERFACE/ [1] https://www.freedesktop.org/software/systemd/man/systemd-gpt-auto-generator.html [2] https://uapi-group.org/specifications/specs/discoverable_partitions_specification/ Signed-off-by: Oliver Steffen <osteffen@redhat.com> Edit to fit with build on SUSE repositories by Valentin Lefebvre <valentin.lefebvre@suse.com> --- grub-core/Makefile.core.def | 6 + grub-core/commands/boot_loader_interface.c | 217 +++++++++++++++++++++ 2 files changed, 223 insertions(+) create mode 100644 grub-core/commands/boot_loader_interface.c diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def index ba967aac8..23455fb71 100644 --- a/grub-core/Makefile.core.def +++ b/grub-core/Makefile.core.def @@ -2643,3 +2643,9 @@ module = { name = crypttab; common = commands/crypttab.c; }; + +module = { + name = boot_loader_interface; + efi = commands/boot_loader_interface.c; + enable = efi; +}; diff --git a/grub-core/commands/boot_loader_interface.c b/grub-core/commands/boot_loader_interface.c new file mode 100644 index 000000000..ccd7fa3d9 --- /dev/null +++ b/grub-core/commands/boot_loader_interface.c @@ -0,0 +1,217 @@ +/*-*- Mode: C; c-basic-offset: 2; indent-tabs-mode: t -*-*/ + +/* boot_loader_interface.c - implementation of the boot loader interface + */ + +/* + * GRUB -- GRand Unified Bootloader + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/charset.h> +#include <grub/efi/api.h> +#include <grub/efi/disk.h> +#include <grub/efi/efi.h> +#include <grub/err.h> +#include <grub/extcmd.h> +#include <grub/gpt_partition.h> +#include <grub/misc.h> +#include <grub/mm.h> +#include <grub/partition.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +#define MODNAME "boot_loader_interface" + +static const grub_efi_guid_t boot_loader_interface_vendor_guid = + { 0x4a67b082, 0x0a4c, 0x41cf, + {0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f} }; + +static char * +machine_get_bootdevice (void) +{ + grub_efi_loaded_image_t *image; + + image = grub_efi_get_loaded_image (grub_efi_image_handle); + if (!image) + return NULL; + + return grub_efidisk_get_device_name (image->device_handle); +} + +static grub_err_t +get_part_uuid (grub_device_t dev, char **part_uuid) +{ + grub_err_t status = GRUB_ERR_NONE; + grub_disk_t disk; + struct grub_gpt_partentry entry; + grub_gpt_part_guid_t *guid; + + if (!dev || !dev->disk || !dev->disk->partition) + return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("invalid device")); + + disk = grub_disk_open (dev->disk->name); + if (!disk) + { + status = grub_errno; + grub_dprintf (MODNAME, "Error opening disk\n"); + return grub_errno; + } + + if (grub_strcmp (dev->disk->partition->partmap->name, "gpt") != 0) + { + status = grub_error (GRUB_ERR_BAD_PART_TABLE, + N_("This is not a GPT partition table")); + goto finish; + } + + if (grub_disk_read (disk, dev->disk->partition->offset, + dev->disk->partition->index, sizeof (entry), &entry)) + { + status = grub_errno; + grub_dprintf (MODNAME, "%s: Read error\n", dev->disk->name); + goto finish; + } + + guid = &entry.guid; + *part_uuid = grub_xasprintf ( + "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", + grub_le_to_cpu32 (guid->data1), grub_le_to_cpu16 (guid->data2), + grub_le_to_cpu16 (guid->data3), guid->data4[0], guid->data4[1], + guid->data4[2], guid->data4[3], guid->data4[4], guid->data4[5], + guid->data4[6], guid->data4[7]); + if (!*part_uuid) + { + status = grub_errno; + } + +finish: + grub_disk_close (disk); + + return status; +} + +static grub_err_t +set_efi_str_variable (const char *name, const grub_efi_guid_t *guid, + const char *value) +{ + grub_size_t len; + grub_size_t len16; + grub_efi_char16_t *value_16; + grub_err_t status; + + len = grub_strlen (value); + len16 = len * GRUB_MAX_UTF16_PER_UTF8; + + value_16 = grub_calloc (len16 + 1, sizeof (value_16[0])); + if (!value_16) + return grub_errno; + + len16 + = grub_utf8_to_utf16 (value_16, len16, (grub_uint8_t *)value, len, NULL); + value_16[len16] = 0; + + status = grub_efi_set_variable_with_attributes ( + name, guid, GRUB_EFI_VARIABLE_BOOTSERVICE_ACCESS | GRUB_EFI_VARIABLE_RUNTIME_ACCESS, + (void *)value_16, (len16 + 1) * sizeof (value_16[0])); + if (status != GRUB_ERR_NONE) + { + grub_dprintf (MODNAME, "Error setting EFI variable %s: %d\n", name, + status); + } + + grub_free (value_16); + + return status; +} + +static grub_err_t +set_loader_info (void) +{ + grub_err_t status; + status = set_efi_str_variable ( + "LoaderInfo", &boot_loader_interface_vendor_guid, PACKAGE_STRING); + return status; +} + +static grub_err_t +set_loader_device_part_uuid (void) +{ + grub_err_t status = GRUB_ERR_NONE; + char *device_name = NULL; + grub_device_t device; + char *part_uuid = NULL; + + device_name = machine_get_bootdevice (); + if (!device_name) + { + return grub_error (GRUB_ERR_BAD_DEVICE, + N_("Unable to find boot device")); + } + + device = grub_device_open (device_name); + if (!device) + { + status = grub_errno; + grub_dprintf (MODNAME, "Error opening device: %s", device_name); + goto err; + } + + status = get_part_uuid (device, &part_uuid); + + grub_device_close (device); + + if (status == GRUB_ERR_NONE) + { + status = set_efi_str_variable ("LoaderDevicePartUUID", + &boot_loader_interface_vendor_guid, + part_uuid); + } + +err: + grub_free (part_uuid); + grub_free (device_name); + return status; +} + +static grub_err_t +grub_cmd_boot_loader_interface (grub_extcmd_context_t ctxt __attribute__ ((unused)), + int argc __attribute__ ((unused)), + char **args __attribute__ ((unused))) +{ + grub_err_t status; + + status = set_loader_info (); + if (status != GRUB_ERR_NONE) + return status; + + status = set_loader_device_part_uuid (); + if (status != GRUB_ERR_NONE) + return status; + + return GRUB_ERR_NONE; +} + +static grub_extcmd_t cmd; + +GRUB_MOD_INIT (boot_loader_interface) +{ + grub_dprintf (MODNAME, "%s got here\n", __func__); + cmd = grub_register_extcmd ( + "boot_loader_interface", grub_cmd_boot_loader_interface, 0, NULL, + N_("Set EFI variables according to Boot Loader Interface spec."), NULL); +} + +GRUB_MOD_FINI (boot_loader_interface) { grub_unregister_extcmd (cmd); } -- 2.39.0
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