The file can be in your local folder. is this not working? in any case, if you call just oainstall with the -i and -m options only he agent will be installed. default option is to NOT install infraspi.
Which would end up installing InfraSPI along with Graphs and Reports. So in case you dont want any of the InfraSPI components to be installed, then either you can have your customized config file with the below setting: