Ticket #33053: class-wp-upgrader.php.patch

class-wp-upgrader.php

@@ -139 +139 @@
                 $this->strings['no_files'] = __('The package contains no files.');
                 $this->strings['folder_exists'] = __('Destination folder already exists.');
                 $this->strings['mkdir_failed'] = __('Could not create directory.');
+                $this->strings['working_dir_filepath_too_long'] = __('Working directory path length is too long.');
                 $this->strings['incompatible_archive'] = __('The package could not be installed.');
                 $this->strings['files_not_writable'] = __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' );
 
@@ -280 +281 @@
                                 $wp_filesystem->delete($upgrade_folder . $file['name'], true);
                 }
 
-                // We need a working directory - Strip off any .tmp or .zip suffixes
-                $working_dir = $upgrade_folder . basename( basename( $package, '.tmp' ), '.zip' );
+                //Strip off any .tmp or .zip suffixes from temporary package filename
+                $tmp_filename_no_suffix = basename( basename( $package, '.tmp' ), '.zip' );
 
+                // We need a working directory
+                $working_dir = $upgrade_folder . $tmp_filename_no_suffix;
+                
+                /* Filepaths should be 255 characters or fewer to prevent errors.
+                If working directory path is longer than 255 characters then try to remove some
+                characters from the temporary directory name to bring it within 255 characters. */
+                $how_much_too_long = strlen($working_dir)-255;
+                
+                if ($how_much_too_long > 0) {
+                        $tmp_filename_no_suffix_length = strlen($tmp_filename_no_suffix);
+                        /* If the length by which the working directory filepath is too long is greater
+                        than or equal to the length of the temporary directory's name then throw an error
+                        as we will not be able to create a short enough working directory path. */
+                        if ($how_much_too_long >= $tmp_filename_no_suffix_length) {
+                                return new WP_Error( 'working_dir_filepath_too_long', $this->strings['working_dir_filepath_too_long'] );
+                        }
+                        $shortened_directory_name = substr($tmp_filename_no_suffix, 0, $tmp_filename_no_suffix_length-$how_much_too_long);
+                        $working_dir = $upgrade_folder . $shortened_directory_name;
+                }
+
                 // Clean up working directory
                 if ( $wp_filesystem->is_dir($working_dir) )
                         $wp_filesystem->delete($working_dir, true);