Because we can.

No, really: In order to employ signed keys in an automated way it is
absolutely necessary to check which keys the signatures come from. Now
you can.

Signed-off-by: Michael J Gruber <g...@drmicha.warpmail.net>
---
 Documentation/pretty-formats.txt | 1 +
 pretty.c                         | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
index 105f18a..2939655 100644
--- a/Documentation/pretty-formats.txt
+++ b/Documentation/pretty-formats.txt
@@ -133,6 +133,7 @@ The placeholders are:
 - '%GG': raw verification message from GPG for a signed commit
 - '%G?': show either "G" for Good or "B" for Bad for a signed commit
 - '%GS': show the name of the signer for a signed commit
+- '%GK': show the key used to sign a signed commit
 - '%gD': reflog selector, e.g., `refs/stash@{1}`
 - '%gd': shortened reflog selector, e.g., `stash@{1}`
 - '%gn': reflog identity name
diff --git a/pretty.c b/pretty.c
index 973b912..b57adef 100644
--- a/pretty.c
+++ b/pretty.c
@@ -762,6 +762,7 @@ struct format_commit_context {
                char *gpg_status;
                char good_bad;
                char *signer;
+               char *key;
        } signature;
        char *message;
        size_t width, indent1, indent2;
@@ -964,7 +965,9 @@ static void parse_signature_lines(struct 
format_commit_context *ctx)
                if (!found)
                        continue;
                ctx->signature.good_bad = signature_check[i].result;
-               found += strlen(signature_check[i].check)+17;
+               found += strlen(signature_check[i].check);
+               ctx->signature.key = xmemdupz(found, 16);
+               found += 17;
                next = strchrnul(found, '\n');
                ctx->signature.signer = xmemdupz(found, next - found);
                break;
@@ -1204,6 +1207,10 @@ static size_t format_commit_one(struct strbuf *sb, const 
char *placeholder,
                        if (c->signature.signer)
                                strbuf_addstr(sb, c->signature.signer);
                        break;
+               case 'K':
+                       if (c->signature.key)
+                               strbuf_addstr(sb, c->signature.key);
+                       break;
                }
                return 2;
        }
-- 
1.8.1.3.797.ge0260c7

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