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Add note about pass insert error and trust-key usage

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When using a previously provisioned YubiKey on a new computer,
I was met with an "Unusable public key" error when trying to insert
a new password, despite being able to decrypt pass entries.

I tried setting the trust on the key via `gpg --edit-key`, but was
then met with "Need secret key to do this."

I found that the solution is apparently to use the `trust-key`
directive in `~/.gnupg/gpg.conf`, which is not mentioned in the README
at the moment.
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James O'Beirne 2021-03-25 11:37:43 -04:00
parent fc6f9eb80d
commit 47cd085518
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README.md
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@ -2480,6 +2480,17 @@ Admin PIN: 12345678
- If you receive the error, `Please insert the card with serial number: *` see [using of multiple keys](#using-multiple-keys).
- If you receive the error, `There is no assurance this key belongs to the named user` or `encryption failed: Unusable public key` use `gpg --edit-key` to set `trust` to `5 = I trust ultimately`.
- If, when you try the above `--edit-key` command, you get the error
`Need the secret key to do this.`, you can manually specify trust for the key in
`~/.gnupg/gpg.conf` by using the `trust-key [your key ID]` directive.
- If, when using a previously provisioned YubiKey on a new computer with `pass`, you see the
following error on `pass insert`:
```
gpg: 0x0000000000000000: There is no assurance this key belongs to the named user
gpg: [stdin]: encryption failed: Unusable public key
```
you need to adjust the trust associated with the key. See the above bullet.
- If you receive the error, `gpg: 0x0000000000000000: skipped: Unusable public key` or `encryption failed: Unusable public key` the sub-key may be expired and can no longer be used to encrypt nor sign messages. It can still be used to decrypt and authenticate, however.