[RESEND v9 6/9] eficonfig: add "Delete Boot Option" menu entry

[Masahisa Kojima]

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.kojima at linaro.org>
---
Changes in v9:
- add function comment

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 | 76 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/cmd/eficonfig.c b/cmd/eficonfig.c
index aeb60f1d09..51d4e36a54 100644
--- a/cmd/eficonfig.c
+++ b/cmd/eficonfig.c
@@ -1711,6 +1711,81 @@ out:
 	return ret;
 }
 
+/**
+ * delete_boot_option() - delete selected boot option
+ *
+ * @bootorder:	pointer to the bootorder
+ * @index:	index to delete in the BootOrder variable
+ * @size:	Bootorder variable size
+ * Return:	status code
+ */
+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;
+}
+
+/**
+ * eficonfig_process_delete_boot_option() - handler to delete boot option
+ *
+ * @data:	pointer to the data for each entry
+ * Return:	status code
+ */
+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;
+}
+
 /**
  * eficonfig_init() - do required initialization for eficonfig command
  *
@@ -1742,6 +1817,7 @@ 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