664 lines
23 KiB
C
664 lines
23 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <stdio.h>
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#include <linux/magic.h>
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#include "sd-id128.h"
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#include "alloc-util.h"
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#include "blkid-util.h"
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#include "bootspec.h"
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#include "conf-files.h"
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#include "def.h"
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#include "device-nodes.h"
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#include "efivars.h"
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#include "env-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "stat-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "virt.h"
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static void boot_entry_free(BootEntry *entry) {
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assert(entry);
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free(entry->id);
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free(entry->path);
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free(entry->title);
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free(entry->show_title);
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free(entry->version);
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free(entry->machine_id);
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free(entry->architecture);
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strv_free(entry->options);
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free(entry->kernel);
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free(entry->efi);
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strv_free(entry->initrd);
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free(entry->device_tree);
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}
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static int boot_entry_load(const char *path, BootEntry *entry) {
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_cleanup_(boot_entry_free) BootEntry tmp = {};
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_cleanup_fclose_ FILE *f = NULL;
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unsigned line = 1;
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char *b, *c;
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int r;
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assert(path);
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assert(entry);
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c = endswith_no_case(path, ".conf");
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if (!c) {
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log_error("Invalid loader entry filename: %s", path);
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return -EINVAL;
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}
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b = basename(path);
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tmp.id = strndup(b, c - b);
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if (!tmp.id)
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return log_oom();
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tmp.path = strdup(path);
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if (!tmp.path)
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return log_oom();
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f = fopen(path, "re");
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if (!f)
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return log_error_errno(errno, "Failed to open \"%s\": %m", path);
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for (;;) {
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_cleanup_free_ char *buf = NULL, *field = NULL;
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const char *p;
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r = read_line(f, LONG_LINE_MAX, &buf);
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if (r == 0)
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break;
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if (r == -ENOBUFS)
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return log_error_errno(r, "%s:%u: Line too long", path, line);
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if (r < 0)
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return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
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line++;
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if (IN_SET(*strstrip(buf), '#', '\0'))
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continue;
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p = buf;
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r = extract_first_word(&p, &field, " \t", 0);
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if (r < 0) {
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log_error_errno(r, "Failed to parse config file %s line %u: %m", path, line);
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continue;
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}
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if (r == 0) {
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log_warning("%s:%u: Bad syntax", path, line);
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continue;
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}
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if (streq(field, "title"))
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r = free_and_strdup(&tmp.title, p);
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else if (streq(field, "version"))
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r = free_and_strdup(&tmp.version, p);
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else if (streq(field, "machine-id"))
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r = free_and_strdup(&tmp.machine_id, p);
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else if (streq(field, "architecture"))
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r = free_and_strdup(&tmp.architecture, p);
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else if (streq(field, "options"))
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r = strv_extend(&tmp.options, p);
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else if (streq(field, "linux"))
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r = free_and_strdup(&tmp.kernel, p);
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else if (streq(field, "efi"))
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r = free_and_strdup(&tmp.efi, p);
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else if (streq(field, "initrd"))
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r = strv_extend(&tmp.initrd, p);
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else if (streq(field, "devicetree"))
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r = free_and_strdup(&tmp.device_tree, p);
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else {
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log_notice("%s:%u: Unknown line \"%s\"", path, line, field);
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continue;
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}
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if (r < 0)
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return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
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}
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*entry = tmp;
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tmp = (BootEntry) {};
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return 0;
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}
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void boot_config_free(BootConfig *config) {
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size_t i;
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assert(config);
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free(config->default_pattern);
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free(config->timeout);
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free(config->editor);
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free(config->auto_entries);
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free(config->auto_firmware);
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free(config->entry_oneshot);
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free(config->entry_default);
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for (i = 0; i < config->n_entries; i++)
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boot_entry_free(config->entries + i);
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free(config->entries);
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}
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static int boot_loader_read_conf(const char *path, BootConfig *config) {
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_cleanup_fclose_ FILE *f = NULL;
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unsigned line = 1;
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int r;
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assert(path);
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assert(config);
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f = fopen(path, "re");
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if (!f) {
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if (errno == ENOENT)
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return 0;
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return log_error_errno(errno, "Failed to open \"%s\": %m", path);
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}
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for (;;) {
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_cleanup_free_ char *buf = NULL, *field = NULL;
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const char *p;
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r = read_line(f, LONG_LINE_MAX, &buf);
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if (r == 0)
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break;
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if (r == -ENOBUFS)
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return log_error_errno(r, "%s:%u: Line too long", path, line);
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if (r < 0)
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return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
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line++;
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if (IN_SET(*strstrip(buf), '#', '\0'))
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continue;
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p = buf;
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r = extract_first_word(&p, &field, " \t", 0);
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if (r < 0) {
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log_error_errno(r, "Failed to parse config file %s line %u: %m", path, line);
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continue;
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}
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if (r == 0) {
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log_warning("%s:%u: Bad syntax", path, line);
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continue;
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}
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if (streq(field, "default"))
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r = free_and_strdup(&config->default_pattern, p);
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else if (streq(field, "timeout"))
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r = free_and_strdup(&config->timeout, p);
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else if (streq(field, "editor"))
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r = free_and_strdup(&config->editor, p);
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else if (streq(field, "auto-entries"))
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r = free_and_strdup(&config->auto_entries, p);
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else if (streq(field, "auto-firmware"))
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r = free_and_strdup(&config->auto_firmware, p);
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else if (streq(field, "console-mode"))
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r = free_and_strdup(&config->console_mode, p);
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else {
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log_notice("%s:%u: Unknown line \"%s\"", path, line, field);
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continue;
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}
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if (r < 0)
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return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
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}
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return 1;
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}
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static int boot_entry_compare(const BootEntry *a, const BootEntry *b) {
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return str_verscmp(a->id, b->id);
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}
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static int boot_entries_find(const char *dir, BootEntry **ret_entries, size_t *ret_n_entries) {
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_cleanup_strv_free_ char **files = NULL;
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char **f;
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int r;
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BootEntry *array = NULL;
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size_t n_allocated = 0, n = 0;
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assert(dir);
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assert(ret_entries);
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assert(ret_n_entries);
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r = conf_files_list(&files, ".conf", NULL, 0, dir, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to list files in \"%s\": %m", dir);
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STRV_FOREACH(f, files) {
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if (!GREEDY_REALLOC0(array, n_allocated, n + 1))
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return log_oom();
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r = boot_entry_load(*f, array + n);
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if (r < 0)
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continue;
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n++;
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}
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typesafe_qsort(array, n, boot_entry_compare);
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*ret_entries = array;
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*ret_n_entries = n;
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return 0;
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}
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static bool find_nonunique(BootEntry *entries, size_t n_entries, bool *arr) {
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size_t i, j;
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bool non_unique = false;
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assert(entries || n_entries == 0);
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assert(arr || n_entries == 0);
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for (i = 0; i < n_entries; i++)
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arr[i] = false;
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for (i = 0; i < n_entries; i++)
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for (j = 0; j < n_entries; j++)
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if (i != j && streq(boot_entry_title(entries + i),
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boot_entry_title(entries + j)))
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non_unique = arr[i] = arr[j] = true;
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return non_unique;
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}
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static int boot_entries_uniquify(BootEntry *entries, size_t n_entries) {
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char *s;
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size_t i;
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int r;
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bool arr[n_entries];
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assert(entries || n_entries == 0);
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/* Find _all_ non-unique titles */
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if (!find_nonunique(entries, n_entries, arr))
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return 0;
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/* Add version to non-unique titles */
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for (i = 0; i < n_entries; i++)
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if (arr[i] && entries[i].version) {
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r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].version);
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if (r < 0)
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return -ENOMEM;
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free_and_replace(entries[i].show_title, s);
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}
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if (!find_nonunique(entries, n_entries, arr))
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return 0;
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/* Add machine-id to non-unique titles */
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for (i = 0; i < n_entries; i++)
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if (arr[i] && entries[i].machine_id) {
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r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].machine_id);
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if (r < 0)
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return -ENOMEM;
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free_and_replace(entries[i].show_title, s);
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}
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if (!find_nonunique(entries, n_entries, arr))
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return 0;
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/* Add file name to non-unique titles */
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for (i = 0; i < n_entries; i++)
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if (arr[i]) {
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r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].id);
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if (r < 0)
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return -ENOMEM;
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free_and_replace(entries[i].show_title, s);
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}
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return 0;
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}
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static int boot_entries_select_default(const BootConfig *config) {
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int i;
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assert(config);
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if (config->entry_oneshot)
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for (i = config->n_entries - 1; i >= 0; i--)
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if (streq(config->entry_oneshot, config->entries[i].id)) {
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log_debug("Found default: id \"%s\" is matched by LoaderEntryOneShot",
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config->entries[i].id);
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return i;
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}
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if (config->entry_default)
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for (i = config->n_entries - 1; i >= 0; i--)
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if (streq(config->entry_default, config->entries[i].id)) {
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log_debug("Found default: id \"%s\" is matched by LoaderEntryDefault",
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config->entries[i].id);
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return i;
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}
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if (config->default_pattern)
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for (i = config->n_entries - 1; i >= 0; i--)
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if (fnmatch(config->default_pattern, config->entries[i].id, FNM_CASEFOLD) == 0) {
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log_debug("Found default: id \"%s\" is matched by pattern \"%s\"",
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config->entries[i].id, config->default_pattern);
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return i;
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}
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if (config->n_entries > 0)
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log_debug("Found default: last entry \"%s\"", config->entries[config->n_entries - 1].id);
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else
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log_debug("Found no default boot entry :(");
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return config->n_entries - 1; /* -1 means "no default" */
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}
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int boot_entries_load_config(const char *esp_path, BootConfig *config) {
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const char *p;
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int r;
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assert(esp_path);
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assert(config);
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p = strjoina(esp_path, "/loader/loader.conf");
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r = boot_loader_read_conf(p, config);
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if (r < 0)
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return r;
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p = strjoina(esp_path, "/loader/entries");
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r = boot_entries_find(p, &config->entries, &config->n_entries);
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if (r < 0)
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return r;
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r = boot_entries_uniquify(config->entries, config->n_entries);
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if (r < 0)
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return log_error_errno(r, "Failed to uniquify boot entries: %m");
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if (is_efi_boot()) {
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r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntryOneShot", &config->entry_oneshot);
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if (r < 0 && r != -ENOENT)
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return log_error_errno(r, "Failed to read EFI var \"LoaderEntryOneShot\": %m");
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r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntryDefault", &config->entry_default);
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if (r < 0 && r != -ENOENT)
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return log_error_errno(r, "Failed to read EFI var \"LoaderEntryDefault\": %m");
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}
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config->default_entry = boot_entries_select_default(config);
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return 0;
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}
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/********************************************************************************/
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static int verify_esp(
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const char *p,
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bool searching,
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bool unprivileged_mode,
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uint32_t *ret_part,
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uint64_t *ret_pstart,
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uint64_t *ret_psize,
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sd_id128_t *ret_uuid) {
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#if HAVE_BLKID
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_cleanup_(blkid_free_probep) blkid_probe b = NULL;
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char t[DEV_NUM_PATH_MAX];
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const char *v;
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#endif
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uint64_t pstart = 0, psize = 0;
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struct stat st, st2;
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const char *t2;
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struct statfs sfs;
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sd_id128_t uuid = SD_ID128_NULL;
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uint32_t part = 0;
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bool relax_checks;
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int r;
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assert(p);
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relax_checks = getenv_bool("SYSTEMD_RELAX_ESP_CHECKS") > 0;
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/* Non-root user can only check the status, so if an error occured in the following, it does not cause any
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* issues. Let's also, silence the error messages. */
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if (!relax_checks) {
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if (statfs(p, &sfs) < 0) {
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/* If we are searching for the mount point, don't generate a log message if we can't find the path */
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if (errno == ENOENT && searching)
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return -ENOENT;
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return log_full_errno(unprivileged_mode && errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
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"Failed to check file system type of \"%s\": %m", p);
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}
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if (!F_TYPE_EQUAL(sfs.f_type, MSDOS_SUPER_MAGIC)) {
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if (searching)
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return -EADDRNOTAVAIL;
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log_error("File system \"%s\" is not a FAT EFI System Partition (ESP) file system.", p);
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return -ENODEV;
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}
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}
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if (stat(p, &st) < 0)
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return log_full_errno(unprivileged_mode && errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
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"Failed to determine block device node of \"%s\": %m", p);
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if (major(st.st_dev) == 0) {
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log_error("Block device node of %p is invalid.", p);
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return -ENODEV;
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}
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t2 = strjoina(p, "/..");
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r = stat(t2, &st2);
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if (r < 0)
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return log_full_errno(unprivileged_mode && errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
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"Failed to determine block device node of parent of \"%s\": %m", p);
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if (st.st_dev == st2.st_dev) {
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log_error("Directory \"%s\" is not the root of the EFI System Partition (ESP) file system.", p);
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return -ENODEV;
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}
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/* In a container we don't have access to block devices, skip this part of the verification, we trust the
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* container manager set everything up correctly on its own. Also skip the following verification for non-root user. */
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if (detect_container() > 0 || unprivileged_mode || relax_checks)
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goto finish;
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#if HAVE_BLKID
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xsprintf_dev_num_path(t, "block", st.st_dev);
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errno = 0;
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b = blkid_new_probe_from_filename(t);
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if (!b)
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return log_error_errno(errno ?: ENOMEM, "Failed to open file system \"%s\": %m", p);
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blkid_probe_enable_superblocks(b, 1);
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blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
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blkid_probe_enable_partitions(b, 1);
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blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
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errno = 0;
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r = blkid_do_safeprobe(b);
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if (r == -2) {
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log_error("File system \"%s\" is ambiguous.", p);
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return -ENODEV;
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} else if (r == 1) {
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log_error("File system \"%s\" does not contain a label.", p);
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return -ENODEV;
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} else if (r != 0)
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return log_error_errno(errno ?: EIO, "Failed to probe file system \"%s\": %m", p);
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errno = 0;
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r = blkid_probe_lookup_value(b, "TYPE", &v, NULL);
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if (r != 0)
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return log_error_errno(errno ?: EIO, "Failed to probe file system type \"%s\": %m", p);
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if (!streq(v, "vfat")) {
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log_error("File system \"%s\" is not FAT.", p);
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return -ENODEV;
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}
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errno = 0;
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r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL);
|
|
if (r != 0)
|
|
return log_error_errno(errno ?: EIO, "Failed to probe partition scheme \"%s\": %m", p);
|
|
if (!streq(v, "gpt")) {
|
|
log_error("File system \"%s\" is not on a GPT partition table.", p);
|
|
return -ENODEV;
|
|
}
|
|
|
|
errno = 0;
|
|
r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL);
|
|
if (r != 0)
|
|
return log_error_errno(errno ?: EIO, "Failed to probe partition type UUID \"%s\": %m", p);
|
|
if (!streq(v, "c12a7328-f81f-11d2-ba4b-00a0c93ec93b")) {
|
|
log_error("File system \"%s\" has wrong type for an EFI System Partition (ESP).", p);
|
|
return -ENODEV;
|
|
}
|
|
|
|
errno = 0;
|
|
r = blkid_probe_lookup_value(b, "PART_ENTRY_UUID", &v, NULL);
|
|
if (r != 0)
|
|
return log_error_errno(errno ?: EIO, "Failed to probe partition entry UUID \"%s\": %m", p);
|
|
r = sd_id128_from_string(v, &uuid);
|
|
if (r < 0) {
|
|
log_error("Partition \"%s\" has invalid UUID \"%s\".", p, v);
|
|
return -EIO;
|
|
}
|
|
|
|
errno = 0;
|
|
r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL);
|
|
if (r != 0)
|
|
return log_error_errno(errno ?: EIO, "Failed to probe partition number \"%s\": m", p);
|
|
r = safe_atou32(v, &part);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to parse PART_ENTRY_NUMBER field.");
|
|
|
|
errno = 0;
|
|
r = blkid_probe_lookup_value(b, "PART_ENTRY_OFFSET", &v, NULL);
|
|
if (r != 0)
|
|
return log_error_errno(errno ?: EIO, "Failed to probe partition offset \"%s\": %m", p);
|
|
r = safe_atou64(v, &pstart);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to parse PART_ENTRY_OFFSET field.");
|
|
|
|
errno = 0;
|
|
r = blkid_probe_lookup_value(b, "PART_ENTRY_SIZE", &v, NULL);
|
|
if (r != 0)
|
|
return log_error_errno(errno ?: EIO, "Failed to probe partition size \"%s\": %m", p);
|
|
r = safe_atou64(v, &psize);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to parse PART_ENTRY_SIZE field.");
|
|
#endif
|
|
|
|
finish:
|
|
if (ret_part)
|
|
*ret_part = part;
|
|
if (ret_pstart)
|
|
*ret_pstart = pstart;
|
|
if (ret_psize)
|
|
*ret_psize = psize;
|
|
if (ret_uuid)
|
|
*ret_uuid = uuid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int find_esp_and_warn(
|
|
const char *path,
|
|
bool unprivileged_mode,
|
|
char **ret_path,
|
|
uint32_t *ret_part,
|
|
uint64_t *ret_pstart,
|
|
uint64_t *ret_psize,
|
|
sd_id128_t *ret_uuid) {
|
|
|
|
int r;
|
|
|
|
/* This logs about all errors except:
|
|
*
|
|
* -ENOKEY → when we can't find the partition
|
|
* -EACCESS → when unprivileged_mode is true, and we can't access something
|
|
*/
|
|
|
|
if (path) {
|
|
r = verify_esp(path, false, unprivileged_mode, ret_part, ret_pstart, ret_psize, ret_uuid);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
goto found;
|
|
}
|
|
|
|
path = getenv("SYSTEMD_ESP_PATH");
|
|
if (path) {
|
|
if (!path_is_valid(path) || !path_is_absolute(path))
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"$SYSTEMD_ESP_PATH does not refer to absolute path, refusing to use it: %s",
|
|
path);
|
|
|
|
/* Note: when the user explicitly configured things with an env var we won't validate the mount
|
|
* point. After all we want this to be useful for testing. */
|
|
goto found;
|
|
}
|
|
|
|
FOREACH_STRING(path, "/efi", "/boot", "/boot/efi") {
|
|
|
|
r = verify_esp(path, true, unprivileged_mode, ret_part, ret_pstart, ret_psize, ret_uuid);
|
|
if (r >= 0)
|
|
goto found;
|
|
if (!IN_SET(r, -ENOENT, -EADDRNOTAVAIL)) /* This one is not it */
|
|
return r;
|
|
}
|
|
|
|
/* No logging here */
|
|
return -ENOKEY;
|
|
|
|
found:
|
|
if (ret_path) {
|
|
char *c;
|
|
|
|
c = strdup(path);
|
|
if (!c)
|
|
return log_oom();
|
|
|
|
*ret_path = c;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int find_default_boot_entry(
|
|
const char *esp_path,
|
|
char **esp_where,
|
|
BootConfig *config,
|
|
const BootEntry **e) {
|
|
|
|
_cleanup_free_ char *where = NULL;
|
|
int r;
|
|
|
|
assert(config);
|
|
assert(e);
|
|
|
|
r = find_esp_and_warn(esp_path, false, &where, NULL, NULL, NULL, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = boot_entries_load_config(where, config);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to load bootspec config from \"%s/loader\": %m", where);
|
|
|
|
if (config->default_entry < 0)
|
|
return log_error_errno(SYNTHETIC_ERRNO(ENOENT),
|
|
"No entry suitable as default, refusing to guess.");
|
|
|
|
*e = &config->entries[config->default_entry];
|
|
log_debug("Found default boot entry in file \"%s\"", (*e)->path);
|
|
|
|
if (esp_where)
|
|
*esp_where = TAKE_PTR(where);
|
|
|
|
return 0;
|
|
}
|