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authorJunio C Hamano <gitster@pobox.com>2011-11-07 16:21:32 -0800
committerJunio C Hamano <gitster@pobox.com>2011-11-09 10:28:04 -0800
commit5231c633f2e54723d53a8cd928d9bc98b39dc35f (patch)
treeb7f624f3742c4baf285d1e59ee1a1dbab1198fee /commit.c
parent274a5c06d525da8c9720ae60454fba6779523c52 (diff)
downloadgit-5231c633f2e54723d53a8cd928d9bc98b39dc35f.tar.gz
commit: copy merged signed tags to headers of merge commit
Now MERGE_HEAD records the tag objects without peeling, we could record the result of manual conflict resolution via "git commit" without losing the tag information. Introduce a new "mergetag" multi-line header field to the commit object, and use it to store the entire contents of each signed tag merged. A commit header that has a multi-line payload begins with the header tag (e.g. "mergetag" in this case), SP, the first line of payload, LF, and all the remaining lines have a SP inserted at the beginning. In hindsight, it would have been better to make "merge --continue" as the way to continue from such an interrupted merge, not "commit", but this is a backward compatibility baggage we would need to carry around for now. Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'commit.c')
-rw-r--r--commit.c96
1 files changed, 92 insertions, 4 deletions
diff --git a/commit.c b/commit.c
index 83ff5035a7..a33bc89d8e 100644
--- a/commit.c
+++ b/commit.c
@@ -840,14 +840,95 @@ struct commit_list *reduce_heads(struct commit_list *heads)
return result;
}
+static void handle_signed_tag(struct commit *parent, struct commit_extra_header ***tail)
+{
+ struct merge_remote_desc *desc;
+ struct commit_extra_header *mergetag;
+ char *buf;
+ unsigned long size, len;
+ enum object_type type;
+
+ desc = merge_remote_util(parent);
+ if (!desc || !desc->obj)
+ return;
+ buf = read_sha1_file(desc->obj->sha1, &type, &size);
+ if (!buf || type != OBJ_TAG)
+ goto free_return;
+ len = parse_signature(buf, size);
+ if (size == len)
+ goto free_return;
+ /*
+ * We could verify this signature and either omit the tag when
+ * it does not validate, but the integrator may not have the
+ * public key of the signer of the tag he is merging, while a
+ * later auditor may have it while auditing, so let's not run
+ * verify-signed-buffer here for now...
+ *
+ * if (verify_signed_buffer(buf, len, buf + len, size - len, ...))
+ * warn("warning: signed tag unverified.");
+ */
+ mergetag = xcalloc(1, sizeof(*mergetag));
+ mergetag->key = xstrdup("mergetag");
+ mergetag->value = buf;
+ mergetag->len = size;
+
+ **tail = mergetag;
+ *tail = &mergetag->next;
+ return;
+
+free_return:
+ free(buf);
+}
+
+void append_merge_tag_headers(struct commit_list *parents,
+ struct commit_extra_header ***tail)
+{
+ while (parents) {
+ struct commit *parent = parents->item;
+ handle_signed_tag(parent, tail);
+ parents = parents->next;
+ }
+}
+
+static void add_extra_header(struct strbuf *buffer,
+ struct commit_extra_header *extra)
+{
+ strbuf_addstr(buffer, extra->key);
+ strbuf_add_lines(buffer, " ", extra->value, extra->len);
+}
+
+void free_commit_extra_headers(struct commit_extra_header *extra)
+{
+ while (extra) {
+ struct commit_extra_header *next = extra->next;
+ free(extra->key);
+ free(extra->value);
+ free(extra);
+ extra = next;
+ }
+}
+
+int commit_tree(const char *msg, unsigned char *tree,
+ struct commit_list *parents, unsigned char *ret,
+ const char *author)
+{
+ struct commit_extra_header *extra = NULL, **tail = &extra;
+ int result;
+
+ append_merge_tag_headers(parents, &tail);
+ result = commit_tree_extended(msg, tree, parents, ret, author, extra);
+ free_commit_extra_headers(extra);
+ return result;
+}
+
static const char commit_utf8_warn[] =
"Warning: commit message does not conform to UTF-8.\n"
"You may want to amend it after fixing the message, or set the config\n"
"variable i18n.commitencoding to the encoding your project uses.\n";
-int commit_tree(const char *msg, unsigned char *tree,
- struct commit_list *parents, unsigned char *ret,
- const char *author)
+int commit_tree_extended(const char *msg, unsigned char *tree,
+ struct commit_list *parents, unsigned char *ret,
+ const char *author, struct commit_extra_header *extra)
{
int result;
int encoding_is_utf8;
@@ -868,8 +949,10 @@ int commit_tree(const char *msg, unsigned char *tree,
*/
while (parents) {
struct commit_list *next = parents->next;
+ struct commit *parent = parents->item;
+
strbuf_addf(&buffer, "parent %s\n",
- sha1_to_hex(parents->item->object.sha1));
+ sha1_to_hex(parent->object.sha1));
free(parents);
parents = next;
}
@@ -881,6 +964,11 @@ int commit_tree(const char *msg, unsigned char *tree,
strbuf_addf(&buffer, "committer %s\n", git_committer_info(IDENT_ERROR_ON_NO_NAME));
if (!encoding_is_utf8)
strbuf_addf(&buffer, "encoding %s\n", git_commit_encoding);
+
+ while (extra) {
+ add_extra_header(&buffer, extra);
+ extra = extra->next;
+ }
strbuf_addch(&buffer, '\n');
/* And add the comment */