No provision to set paths for sftp (ssh2)

[fsrs]

I have a server which has different paths for the web server verses when accessed via sftp and consequently updates fail with "Unable to locate WordPress content directory (wp-content)."

According to this page ​https://codex.wordpress.org/Editing%20wp-config.php#Enabling_SSH_Upgrade_Access there are 3 options for this exact purpose: FTP_BASE, FTP_CONTENT_DIR, FTP_PLUGIN_DIR.

Setting these has no affect.

This is confirmed by turning on debug and the following error is generated:
"Installation failed: Looking for /usr/local/www/+++++/www/wp-content/plugins in /"

The "wp-admin/includes/class-wp-filesystem-base.php" file reveals the find_folder function only processes the overrides for ftp services.

        public function find_folder( $folder ) {
                if ( isset( $this->cache[ $folder ] ) )
                        return $this->cache[ $folder ];
 
                if ( stripos($this->method, 'ftp') !== false ) {
                        $constant_overrides = array(
                                'FTP_BASE' => ABSPATH,
                                'FTP_CONTENT_DIR' => WP_CONTENT_DIR,
                                'FTP_PLUGIN_DIR' => WP_PLUGIN_DIR,
                                'FTP_LANG_DIR' => WP_LANG_DIR
                        );

Seems to be a strange requirement on the ssh2 method that the paths must align exactly with the web server so I consider this a bug. Others may consider it an enhancement in which case it would be a good idea if the codex entry made it clear only ftp access methods support configurable paths (ssh must align with the webserver).