gpg.program::
	Use this custom program instead of "`gpg`" found on `$PATH` when
	making or verifying a PGP signature. The program must support the
	same command-line interface as GPG, namely, to verify a detached
	signature, "`gpg --verify $signature - <$file`" is run, and the
	program is expected to signal a good signature by exiting with
	code 0.  To generate an ASCII-armored detached signature, the
	standard input of "`gpg -bsau $key`" is fed with the contents to be
	signed, and the program is expected to send the result to its
	standard output.

gpg.format::
	Specifies which key format to use when signing with `--gpg-sign`.
	Default is "openpgp". Other possible values are "x509", "ssh".
+
See linkgit:gitformat-signature[5] for the signature format, which differs
based on the selected `gpg.format`.

gpg.<format>.program::
	Use this to customize the program used for the signing format you
	chose. (see `gpg.program` and `gpg.format`) `gpg.program` can still
	be used as a legacy synonym for `gpg.openpgp.program`. The default
	value for `gpg.x509.program` is "gpgsm" and `gpg.ssh.program` is "ssh-keygen".

gpg.minTrustLevel::
	Specifies a minimum trust level for signature verification.  If
	this option is unset, then signature verification for merge
	operations requires a key with at least `marginal` trust.  Other
	operations that perform signature verification require a key
	with at least `undefined` trust.  Setting this option overrides
	the required trust-level for all operations.  Supported values,
	in increasing order of significance:
+
* `undefined`
* `never`
* `marginal`
* `fully`
* `ultimate`

gpg.ssh.defaultKeyCommand::
	This command will be run when user.signingkey is not set and a ssh
	signature is requested. On successful exit a valid ssh public key
	prefixed with `key::` is expected in the first line of its output.
	This allows for a script doing a dynamic lookup of the correct public
	key when it is impractical to statically configure `user.signingKey`.
	For example when keys or SSH Certificates are rotated frequently or
	selection