[PATCH 6/6] efi_loader: support file rename in SetInfo()

[Gabriel Dalimonte <gabriel.dalimonte@gmail.com>]

Following the UEFI specification. The specification did not seem to
delineate if file_name was explicitly a file name only, or could
include paths to move the file to a different directory. The more
generous interpretation of supporting paths was selected.

Signed-off-by: Gabriel Dalimonte <gabriel.dalimonte@gmail.com>
---

 lib/efi_loader/efi_file.c | 48 +++++++++++++++++++++++++++++++++++----
 1 file changed, 43 insertions(+), 5 deletions(-)

diff --git a/lib/efi_loader/efi_file.c b/lib/efi_loader/efi_file.c
index e72bc36aca..f3d643a057 100644
--- a/lib/efi_loader/efi_file.c
+++ b/lib/efi_loader/efi_file.c
@@ -981,11 +981,49 @@ static efi_status_t EFIAPI efi_file_setinfo(struct efi_file_handle *file,
 		pos = new_file_name;
 		utf16_utf8_strcpy(&pos, info->file_name);
 		if (strcmp(new_file_name, filename)) {
-			/* TODO: we do not support renaming */
-			EFI_PRINT("Renaming not supported\n");
-			free(new_file_name);
-			ret = EFI_ACCESS_DENIED;
-			goto out;
+			int dlen;
+			int rv;
+			char *new_path;
+
+			if (set_blk_dev(fh)) {
+				free(new_file_name);
+				ret = EFI_DEVICE_ERROR;
+				goto out;
+			}
+			dlen = filename - fh->path;
+			new_path = calloc(1, dlen + strlen(new_file_name) + 1);
+			if (!new_path) {
+				free(new_file_name);
+				ret = EFI_OUT_OF_RESOURCES;
+				goto out;
+			}
+			memcpy(new_path, fh->path, dlen);
+			strcpy(new_path + dlen, new_file_name);
+			sanitize_path(new_path);
+			rv = fs_exists(new_path);
+			if (rv) {
+				free(new_path);
+				free(new_file_name);
+				ret = EFI_ACCESS_DENIED;
+				goto out;
+			}
+			/* fs_exists() calls fs_close(), so open file system again */
+			if (set_blk_dev(fh)) {
+				free(new_path);
+				free(new_file_name);
+				ret = EFI_DEVICE_ERROR;
+				goto out;
+			}
+			rv = fs_rename(fh->path, new_path);
+			if (rv) {
+				free(new_path);
+				free(new_file_name);
+				ret = EFI_ACCESS_DENIED;
+				goto out;
+			}
+			free(fh->path);
+			fh->path = new_path;
+			ret = EFI_SUCCESS;
 		}
 		free(new_file_name);
 		/* Check for truncation */
-- 
2.34.1