bootctl: add boot loader and firmware interface tool

1 files changed, 171 insertions, 0 deletions

diff --git a/src/boot/boot-efi.c b/src/boot/boot-efi.c
new file mode 100644
index 0000000000..32cb973cf6
--- /dev/null
+++ b/src/boot/boot-efi.c
@@ -0,0 +1,171 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Kay Sievers
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <locale.h>
+#include <string.h>
+#include <fnmatch.h>
+#include <fcntl.h>
+#include <sys/timex.h>
+
+#include "boot.h"
+#include "boot-loader.h"
+#include "build.h"
+#include "util.h"
+#include "strv.h"
+#include "efivars.h"
+#include "conf-files.h"
+
+static int get_boot_entries(struct boot_info *info) {
+        DIR *d = NULL;
+        struct dirent *dent;
+        int err = 0;
+
+        d = opendir("/sys/firmware/efi/efivars");
+        if (!d)
+                return -errno;
+
+        for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
+                unsigned int id;
+                struct boot_info_entry *e;
+
+                if (dent->d_name[0] == '.')
+                        continue;
+                if (sscanf(dent->d_name, "Boot%04X-8be4df61-93ca-11d2-aa0d-00e098032b8c", &id) != 1)
+                        continue;
+
+                e = realloc(info->fw_entries, (info->fw_entries_count+1) * sizeof(struct boot_info_entry));
+                if (!e) {
+                        err = -ENOMEM;
+                        break;
+                }
+                info->fw_entries = e;
+
+                e = &info->fw_entries[info->fw_entries_count];
+                memset(e, 0, sizeof(struct boot_info_entry));
+                e->order = -1;
+
+                err = efi_get_boot_option(id, NULL, &e->title, &e->part_uuid, &e->path, &e->data, &e->data_size);
+                if (err < 0)
+                        break;
+                e->id = id;
+
+                info->fw_entries_count++;
+        }
+        closedir(d);
+
+        return err;
+}
+
+static int find_active_entry(struct boot_info *info) {
+        uint16_t boot_cur;
+        void *buf;
+        size_t l;
+        size_t i;
+        int err = -ENOENT;
+
+        err = efi_get_variable(EFI_VENDOR_GLOBAL, "BootCurrent", NULL, &buf, &l);
+        if (err < 0)
+                return err;
+
+        memcpy(&boot_cur, buf, sizeof(uint16_t));
+        for (i = 0; i < info->fw_entries_count; i++) {
+                if (info->fw_entries[i].id != boot_cur)
+                        continue;
+                info->fw_entry_active = i;
+                err = 0;
+                break;
+        }
+        free(buf);
+        return err;
+}
+
+static int get_boot_order(struct boot_info *info) {
+        size_t i, k;
+        int err;
+
+        err = efi_get_boot_order(&info->fw_entries_order, &info->fw_entries_order_count);
+        if (err < 0)
+                return err;
+
+        for (i = 0; i < info->fw_entries_order_count; i++) {
+                for (k = 0; k < info->fw_entries_count; k++) {
+                        if (info->fw_entries[k].id != info->fw_entries_order[i])
+                                continue;
+                        info->fw_entries[k].order = i;
+                        break;
+                }
+        }
+
+        return 0;
+}
+
+static int entry_cmp(const void *a, const void *b) {
+        const struct boot_info_entry *e1 = a;
+        const struct boot_info_entry *e2 = b;
+
+        /* boot order of active entries */
+        if (e1->order > 0 && e2->order > 0)
+                return e1->order - e2->order;
+
+        /* sort active entries before inactive ones */
+        if (e1->order > 0)
+                return 1;
+        if (e2->order > 0)
+                return -1;
+
+        /* order of inactive entries */
+        return e1->id - e2->id;
+}
+
+int boot_info_query(struct boot_info *info) {
+        char str[64];
+        char buf[64];
+        char *loader_active;
+
+        info->loader = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderInfo");
+
+        get_boot_entries(info);
+        if (info->fw_entries_count > 0) {
+                get_boot_order(info);
+                qsort(info->fw_entries, info->fw_entries_count, sizeof(struct boot_info_entry), entry_cmp);
+                find_active_entry(info);
+        }
+
+        info->fw_type = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderFirmwareType");
+        info->fw_info = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderFirmwareInfo");
+        info->loader_image_path = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderImageIdentifier");
+        efi_get_loader_device_part_uuid(&info->loader_part_uuid);
+
+        boot_loader_read_entries(info);
+        loader_active = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntrySelected");
+        if (loader_active) {
+                boot_loader_find_active_entry(info, loader_active);
+                free(loader_active);
+        }
+
+        snprintf(str, sizeof(str), "LoaderEntryOptions-%s", sd_id128_to_string(info->machine_id, buf));
+        info->loader_options_added = efi_get_variable_string(EFI_VENDOR_LOADER, str);
+        return 0;
+}