commit_tree(): add a new author parameter

In case it's NULL, it is still determined automatically, but now you
have the ability to specify one yourself.

Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-commit-tree.c

@@ -46,7 +46,8 @@ static const char commit_utf8_warn[] =
 "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)
+		struct commit_list *parents, unsigned char *ret,
+		const char *author)
 {
 	int result;
 	int encoding_is_utf8;
@@ -74,7 +75,9 @@ int commit_tree(const char *msg, unsigned char *tree,
 	}
 
 	/* Person/date information */
-	strbuf_addf(&buffer, "author %s\n", git_author_info(IDENT_ERROR_ON_NO_NAME));
+	if (!author)
+		author = git_author_info(IDENT_ERROR_ON_NO_NAME);
+	strbuf_addf(&buffer, "author %s\n", author);
 	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);
@@ -123,7 +126,7 @@ int cmd_commit_tree(int argc, const char **argv, const char *prefix)
 	if (strbuf_read(&buffer, 0, 0) < 0)
 		die("git commit-tree: read returned %s", strerror(errno));
 
-	if (!commit_tree(buffer.buf, tree_sha1, parents, commit_sha1)) {
+	if (!commit_tree(buffer.buf, tree_sha1, parents, commit_sha1, NULL)) {
 		printf("%s\n", sha1_to_hex(commit_sha1));
 		return 0;
 	}

builtin-merge.c

@@ -691,7 +691,7 @@ static int merge_trivial(void)
 	parent->next = xmalloc(sizeof(struct commit_list *));
 	parent->next->item = remoteheads->item;
 	parent->next->next = NULL;
-	commit_tree(merge_msg.buf, result_tree, parent, result_commit);
+	commit_tree(merge_msg.buf, result_tree, parent, result_commit, NULL);
 	finish(result_commit, "In-index merge");
 	drop_save();
 	return 0;
@@ -720,7 +720,7 @@ static int finish_automerge(struct commit_list *common,
 	}
 	free_commit_list(remoteheads);
 	strbuf_addch(&merge_msg, '\n');
-	commit_tree(merge_msg.buf, result_tree, parents, result_commit);
+	commit_tree(merge_msg.buf, result_tree, parents, result_commit, NULL);
 	strbuf_addf(&buf, "Merge made by %s.", wt_strategy);
 	finish(result_commit, buf.buf);
 	strbuf_release(&buf);

builtin.h

@@ -17,7 +17,8 @@ extern int read_line_with_nul(char *buf, int size, FILE *file);
 extern int fmt_merge_msg(int merge_summary, struct strbuf *in,
 	struct strbuf *out);
 extern int commit_tree(const char *msg, unsigned char *tree,
-		struct commit_list *parents, unsigned char *ret);
+		struct commit_list *parents, unsigned char *ret,
+		const char *author);
 extern int check_pager_config(const char *cmd);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);