This commit adds the menu entry to delete the UEFI boot option.
User moves the entry with UP/DOWN key, changes, then presses
ENTER key to delete the selected boot option.

Signed-off-by: Masahisa Kojima <masahisa.koj...@linaro.org>
---
Changes in v8:
- function and structure prefix is changed to "eficonfig"

Changes in v7:
- to stay the boot order list after user delete the entry

no update in v6:

changes in v5:
 cmd/eficonfig.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/cmd/eficonfig.c b/cmd/eficonfig.c
index 0ba70bb10f..b8907f36dc 100644
--- a/cmd/eficonfig.c
+++ b/cmd/eficonfig.c
@@ -1604,6 +1604,67 @@ out:
        return ret;
 }
 
+static efi_status_t delete_boot_option(u16 *bootorder, u16 index, efi_uintn_t 
size)
+{
+       u16 varname[9];
+       efi_status_t ret;
+       efi_uintn_t num;
+
+       efi_create_indexed_name(varname, sizeof(varname),
+                               "Boot", bootorder[index]);
+       ret = efi_set_variable_int(varname, &efi_global_variable_guid,
+                                  0, 0, NULL, false);
+       if (ret != EFI_SUCCESS) {
+               log_err("delete boot option(%ls) failed\n", varname);
+               return ret;
+       }
+
+       /* update BootOrder */
+       num = size / sizeof(u16);
+       memmove(&bootorder[index], &bootorder[index + 1],
+               (num - index - 1) * sizeof(u16));
+       size -= sizeof(u16);
+       ret = efi_set_variable_int(u"BootOrder", &efi_global_variable_guid,
+                                  EFI_VARIABLE_NON_VOLATILE |
+                                  EFI_VARIABLE_BOOTSERVICE_ACCESS |
+                                  EFI_VARIABLE_RUNTIME_ACCESS,
+                                  size, bootorder, false);
+
+       return ret;
+}
+
+static efi_status_t eficonfig_process_delete_boot_option(void *data)
+{
+       int selected;
+       u16 *bootorder;
+       efi_status_t ret;
+       efi_uintn_t num, size;
+
+       while (1) {
+               bootorder = efi_get_var(u"BootOrder", 
&efi_global_variable_guid, &size);
+               if (!bootorder) {
+                       eficonfig_print_msg("BootOrder is not defined!");
+                       ret = EFI_NOT_FOUND;
+                       return ret;
+               }
+
+               num = size / sizeof(u16);
+               ret = eficonfig_show_boot_selection(bootorder, num, &selected);
+               if (ret == EFI_SUCCESS)
+                       ret = delete_boot_option(bootorder, selected, size);
+
+               if (ret != EFI_SUCCESS)
+                       break;
+       }
+
+       free(bootorder);
+
+       /* to stay the parent menu */
+       ret = (ret == EFI_ABORTED) ? EFI_NOT_READY : ret;
+
+       return ret;
+}
+
 static efi_status_t eficonfig_init(void)
 {
        efi_status_t ret;
@@ -1639,6 +1700,7 @@ static const struct eficonfig_item 
maintenance_menu_items[] = {
        {"Add Boot Option", eficonfig_process_add_boot_option},
        {"Edit Boot Option", eficonfig_process_edit_boot_option},
        {"Change Boot Order", eficonfig_process_change_boot_order},
+       {"Delete Boot Option", eficonfig_process_delete_boot_option},
        {"Quit", eficonfig_process_quit},
 };
 
-- 
2.17.1

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