cacheid and preset_passphrase

[Ben Kibbey]

I have a couple of questions about gpg-agent. First, how do I determine
an unused cache ID? Another application may be using a specified cache
ID and I wouldn't want to meddle with it or retrieve an invalid value.

Second, is there an equivalent PRESET_PASSPHRASE to update an existing
cache ID rather than a key grip?

-- 
Benjamin J. Kibbey bjk at luxsci.net/jabber/freenode
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