Function write_commit_tree

commit.c:1693–1734

   "variable i18n.commitEncoding to the encoding your project uses.\n");

static void write_commit_tree(struct strbuf *buffer, const char *msg, size_t msg_len,
			      const struct object_id *tree,
			      const struct object_id *parents, size_t parents_len,
			      const char *author, const char *committer,
			      const struct commit_extra_header *extra)
{
	int encoding_is_utf8;
	size_t i;

	/* Not having i18n.commitencoding is the same as having utf-8 */
	encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);

	strbuf_grow(buffer, 8192); /* should avoid reallocs for the headers */
	strbuf_addf(buffer, "tree %s\n", oid_to_hex(tree));

	/*
	 * NOTE! This ordering means that the same exact tree merged with a
	 * different order of parents will be a _different_ changeset even
	 * if everything else stays the same.
	 */
	for (i = 0; i < parents_len; i++)
		strbuf_addf(buffer, "parent %s\n", oid_to_hex(&parents[i]));

	/* Person/date information */
	if (!author)
		author = git_author_info(IDENT_STRICT);
	strbuf_addf(buffer, "author %s\n", author);
	if (!committer)
		committer = git_committer_info(IDENT_STRICT);
	strbuf_addf(buffer, "committer %s\n", committer);
	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 */
	strbuf_add(buffer, msg, msg_len);
}

int commit_tree_extended(const char *msg, size_t msg_len,
			 const struct object_id *tree,