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authorJunio C Hamano <gitster@pobox.com>2012-01-04 13:51:28 -0800
committerJunio C Hamano <gitster@pobox.com>2012-01-05 13:02:27 -0800
commit824958e50b250e957998626a21763603ca30e832 (patch)
tree5831ae9621501ab28237f16e230e8b4420c31940 /log-tree.c
parentc6b3ec41e2efdd9e05118c2e99ad70f0e0629873 (diff)
downloadgit-824958e50b250e957998626a21763603ca30e832.tar.gz
log-tree: show mergetag in log --show-signature output
A commit object that merges a signed tag records the "mergetag" extended header. Check the validity of the GPG signature on it, and show it in a way similar to how "gpgsig" extended header is shown. Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'log-tree.c')
-rw-r--r--log-tree.c76
1 files changed, 75 insertions, 1 deletions
diff --git a/log-tree.c b/log-tree.c
index 005c5a51c0..61a12a7cb0 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -443,6 +443,78 @@ static void show_signature(struct rev_info *opt, struct commit *commit)
strbuf_release(&signature);
}
+static int which_parent(const unsigned char *sha1, const struct commit *commit)
+{
+ int nth;
+ const struct commit_list *parent;
+
+ for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
+ if (!hashcmp(parent->item->object.sha1, sha1))
+ return nth;
+ nth++;
+ }
+ return -1;
+}
+
+static void show_one_mergetag(struct rev_info *opt,
+ struct commit_extra_header *extra,
+ struct commit *commit)
+{
+ unsigned char sha1[20];
+ struct tag *tag;
+ struct strbuf verify_message;
+ int status, nth;
+ size_t payload_size, gpg_message_offset;
+
+ hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), sha1);
+ tag = lookup_tag(sha1);
+ if (!tag)
+ return; /* error message already given */
+
+ strbuf_init(&verify_message, 256);
+ if (parse_tag_buffer(tag, extra->value, extra->len))
+ strbuf_addstr(&verify_message, "malformed mergetag\n");
+ else if ((nth = which_parent(tag->tagged->sha1, commit)) < 0)
+ strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
+ tag->tag, tag->tagged->sha1);
+ else
+ strbuf_addf(&verify_message,
+ "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
+ gpg_message_offset = verify_message.len;
+
+ payload_size = parse_signature(extra->value, extra->len);
+ if ((extra->len <= payload_size) ||
+ (verify_signed_buffer(extra->value, payload_size,
+ extra->value + payload_size,
+ extra->len - payload_size,
+ &verify_message) &&
+ verify_message.len <= gpg_message_offset)) {
+ strbuf_addstr(&verify_message, "No signature\n");
+ status = -1;
+ }
+ else if (strstr(verify_message.buf + gpg_message_offset,
+ ": Good signature from "))
+ status = 0;
+ else
+ status = -1;
+
+ show_sig_lines(opt, status, verify_message.buf);
+ strbuf_release(&verify_message);
+}
+
+static void show_mergetag(struct rev_info *opt, struct commit *commit)
+{
+ struct commit_extra_header *extra, *to_free;
+
+ to_free = read_commit_extra_headers(commit, NULL);
+ for (extra = to_free; extra; extra = extra->next) {
+ if (strcmp(extra->key, "mergetag"))
+ continue; /* not a merge tag */
+ show_one_mergetag(opt, extra, commit);
+ }
+ free_commit_extra_headers(to_free);
+}
+
void show_log(struct rev_info *opt)
{
struct strbuf msgbuf = STRBUF_INIT;
@@ -554,8 +626,10 @@ void show_log(struct rev_info *opt)
}
}
- if (opt->show_signature)
+ if (opt->show_signature) {
show_signature(opt, commit);
+ show_mergetag(opt, commit);
+ }
if (!commit->buffer)
return;