wpkg --list-index-packages

Options Comments
--admindir Define the administration directory, where the database of the installed packages resides.
--debug Define a set of flags of things to print out for debug purposes.
--instdir Define the installation directory, where the data files are installed on the target.
--quiet Request for warning messages to not be displayed.
--root Define the installation root path.
--verbose Display log information of level INFO.

The --create-index command is used to create an archive with a complete list of packages available in a directory. The resulting archive can be read with the --list-index-packages command. The output shows you the size of the control file of each package, the Date field, and the name of the package which includes the version and architecture the package was built for.

wpkg --list-index-packages index.tar.gz

You may specify multiple index files on the same command line.

This wpkg command is similar to using gzip and tar, although the output looks different between both. So you could do this:

tar tzvf index.tar.gz