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The gpg-preset-passphrase is a utility to seed the internal
cache of a running gpg-agent with passphrases. It is mainly
useful for unattended machines, where the usual pinentry tool
may not be used and the passphrases for the to be used keys are given at
machine startup.
This program works with GnuPG 2 and later. GnuPG 1.x is not supported.
Passphrases set with this utility don’t expire unless the
--forget option is used to explicitly clear them from the
cache — or gpg-agent is either restarted or reloaded (by
sending a SIGHUP to it). Note that the maximum cache time as set with
--max-cache-ttl is still honored. It is necessary to allow
this passphrase presetting by starting gpg-agent with the
--allow-preset-passphrase.