bootctl: split out "set-efivar" verbs, too

1 files changed, 149 insertions, 0 deletions

diff --git a/src/boot/bootctl-set-efivar.c b/src/boot/bootctl-set-efivar.c
new file mode 100644
index 0000000000..cbf92caaaf
--- /dev/null
+++ b/src/boot/bootctl-set-efivar.c
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <uchar.h>
+#include <unistd.h>
+
+#include "bootctl.h"
+#include "bootctl-set-efivar.h"
+#include "efivars.h"
+#include "stdio-util.h"
+#include "utf8.h"
+#include "virt.h"
+
+static int parse_timeout(const char *arg1, char16_t **ret_timeout, size_t *ret_timeout_size) {
+        char utf8[DECIMAL_STR_MAX(usec_t)];
+        char16_t *encoded;
+        usec_t timeout;
+        int r;
+
+        assert(arg1);
+        assert(ret_timeout);
+        assert(ret_timeout_size);
+
+        if (streq(arg1, "menu-force"))
+                timeout = USEC_INFINITY;
+        else if (streq(arg1, "menu-hidden"))
+                timeout = 0;
+        else {
+                r = parse_time(arg1, &timeout, USEC_PER_SEC);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to parse timeout '%s': %m", arg1);
+                if (timeout != USEC_INFINITY && timeout > UINT32_MAX * USEC_PER_SEC)
+                        log_warning("Timeout is too long and will be treated as 'menu-force' instead.");
+        }
+
+        xsprintf(utf8, USEC_FMT, MIN(timeout / USEC_PER_SEC, UINT32_MAX));
+
+        encoded = utf8_to_utf16(utf8, strlen(utf8));
+        if (!encoded)
+                return log_oom();
+
+        *ret_timeout = encoded;
+        *ret_timeout_size = char16_strlen(encoded) * 2 + 2;
+        return 0;
+}
+
+static int parse_loader_entry_target_arg(const char *arg1, char16_t **ret_target, size_t *ret_target_size) {
+        char16_t *encoded = NULL;
+        int r;
+
+        assert(arg1);
+        assert(ret_target);
+        assert(ret_target_size);
+
+        if (streq(arg1, "@current")) {
+                r = efi_get_variable(EFI_LOADER_VARIABLE(LoaderEntrySelected), NULL, (void *) ret_target, ret_target_size);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get EFI variable 'LoaderEntrySelected': %m");
+
+        } else if (streq(arg1, "@oneshot")) {
+                r = efi_get_variable(EFI_LOADER_VARIABLE(LoaderEntryOneShot), NULL, (void *) ret_target, ret_target_size);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get EFI variable 'LoaderEntryOneShot': %m");
+
+        } else if (streq(arg1, "@default")) {
+                r = efi_get_variable(EFI_LOADER_VARIABLE(LoaderEntryDefault), NULL, (void *) ret_target, ret_target_size);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get EFI variable 'LoaderEntryDefault': %m");
+
+        } else if (arg1[0] == '@' && !streq(arg1, "@saved"))
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unsupported special entry identifier: %s", arg1);
+        else {
+                encoded = utf8_to_utf16(arg1, strlen(arg1));
+                if (!encoded)
+                        return log_oom();
+
+                *ret_target = encoded;
+                *ret_target_size = char16_strlen(encoded) * 2 + 2;
+        }
+
+        return 0;
+}
+
+int verb_set_efivar(int argc, char *argv[], void *userdata) {
+        int r;
+
+        if (arg_root)
+                return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+                                       "Acting on %s, skipping EFI variable setup.",
+                                       arg_image ? "image" : "root directory");
+
+        if (!is_efi_boot())
+                return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+                                       "Not booted with UEFI.");
+
+        if (access(EFIVAR_PATH(EFI_LOADER_VARIABLE(LoaderInfo)), F_OK) < 0) {
+                if (errno == ENOENT) {
+                        log_error_errno(errno, "Not booted with a supported boot loader.");
+                        return -EOPNOTSUPP;
+                }
+
+                return log_error_errno(errno, "Failed to detect whether boot loader supports '%s' operation: %m", argv[0]);
+        }
+
+        if (detect_container() > 0)
+                return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+                                       "'%s' operation not supported in a container.",
+                                       argv[0]);
+
+        if (!arg_touch_variables)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "'%s' operation cannot be combined with --no-variables.",
+                                       argv[0]);
+
+        const char *variable;
+        int (* arg_parser)(const char *, char16_t **, size_t *);
+
+        if (streq(argv[0], "set-default")) {
+                variable = EFI_LOADER_VARIABLE(LoaderEntryDefault);
+                arg_parser = parse_loader_entry_target_arg;
+        } else if (streq(argv[0], "set-oneshot")) {
+                variable = EFI_LOADER_VARIABLE(LoaderEntryOneShot);
+                arg_parser = parse_loader_entry_target_arg;
+        } else if (streq(argv[0], "set-timeout")) {
+                variable = EFI_LOADER_VARIABLE(LoaderConfigTimeout);
+                arg_parser = parse_timeout;
+        } else if (streq(argv[0], "set-timeout-oneshot")) {
+                variable = EFI_LOADER_VARIABLE(LoaderConfigTimeoutOneShot);
+                arg_parser = parse_timeout;
+        } else
+                assert_not_reached();
+
+        if (isempty(argv[1])) {
+                r = efi_set_variable(variable, NULL, 0);
+                if (r < 0 && r != -ENOENT)
+                        return log_error_errno(r, "Failed to remove EFI variable '%s': %m", variable);
+        } else {
+                _cleanup_free_ char16_t *value = NULL;
+                size_t value_size = 0;
+
+                r = arg_parser(argv[1], &value, &value_size);
+                if (r < 0)
+                        return r;
+                r = efi_set_variable(variable, value, value_size);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to update EFI variable '%s': %m", variable);
+        }
+
+        return 0;
+}