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git/Documentation/config/gpg.txt
Fabian Stelzer 29b315778e ssh signing: add ssh key format and signing code
Implements the actual sign_buffer_ssh operation and move some shared
cleanup code into a strbuf function

Set gpg.format = ssh and user.signingkey to either a ssh public key
string (like from an authorized_keys file), or a ssh key file.
If the key file or the config value itself contains only a public key
then the private key needs to be available via ssh-agent.

gpg.ssh.program can be set to an alternative location of ssh-keygen.
A somewhat recent openssh version (8.2p1+) of ssh-keygen is needed for
this feature. Since only ssh-keygen is needed it can this way be
installed seperately without upgrading your system openssh packages.

Signed-off-by: Fabian Stelzer <fs@gigacodes.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-09-10 14:15:51 -07:00

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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, and 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".
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 require 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`