File ‘SIGNATURE.SMF’ cannot be found in the SAP HANA Database installation kit. You can ignore this error and continue with the execution by passing the ignore option ‘check_signature_file’ to hdblcm. See SAP note 2078425, section ‘How to prepare SAP HANA packages for installation or update’ for instructions how to prepare packages for update or implications of ignoring this error.
I got this error when I am trying to upgrade revision of our HANA Database. When I extract Revision Patch using sapcar -xvf command it was not creating SIGNATURE.SMF file. So I extracted IMDB.SAR file using below command.
sapcar -xvf IMDB_SERVER100_102_6-10009569.SAR -manifest SIGNATURE.SMF
Now I created SIGNATURE.SMF file in /tmpsoft folder. Now I copied signature.smf to /SAP_HANA_DATABASE folder and resumed the upgrade.