describe: when failing, tell the user about options that work

diff --git a/builtin-commit-tree.c b/builtin-commit-tree.c
index 0453425c471f1d6793bc7f5f59d17e9d285ddfc6..64670777312c71d45b10f72a1efe9fceae3e3b89 100644 (file)
--- a/builtin-commit-tree.c
+++ b/builtin-commit-tree.c
@@ -124,7 +124,7 @@ 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));
+               die_errno("git commit-tree: failed to read");
 
        if (!commit_tree(buffer.buf, tree_sha1, parents, commit_sha1, NULL)) {
                printf("%s\n", sha1_to_hex(commit_sha1));