gpg-interface.c: obtain primary key fingerprint as well

Obtain the primary key fingerprint off VALIDSIG status message,
and expose it via %GP format.

Signed-off-by: Michał Górny <mgorny@gentoo.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/pretty.c b/pretty.c
index b9caa9bd2f..53e4db12cf 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1260,6 +1260,10 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 			if (c->signature_check.fingerprint)
 				strbuf_addstr(sb, c->signature_check.fingerprint);
 			break;
+		case 'P':
+			if (c->signature_check.primary_key_fingerprint)
+				strbuf_addstr(sb, c->signature_check.primary_key_fingerprint);
+			break;
 		default:
 			return 0;
 		}