Customizing installed commands: p11-kit

## Customizing installed commands

The `p11-kit` tool provides a `extract-trust` command which extracts trust policy information such as certificate anchors and so on into files for use with libraries that cannot read this trust information directly.

In order to be useful the `extract-trust` command needs to be customized per distribution or site. You can find this file in at `tools/p11-kit-trust-extract.in` in the p11-kit source code.

The command is implemented as a simple script which performs the various `p11-kit extract` commands necessary to extract the information.

Using this script as a standard way to extract this information allows for consistency between distributions and ease of system administration.