Merge branch 'nd/reject-empty-shallow-request'

"git fetch --shallow-since=<cutoff>" that specifies the cut-off
point that is newer than the existing history used to end up
grabbing the entire history.  Such a request now errors out.

* nd/reject-empty-shallow-request:
  upload-pack: reject shallow requests that would return nothing

1 files changed, 3 insertions, 0 deletions

diff --git a/shallow.c b/shallow.c
index 2abebeb..79439a8 100644
--- a/shallow.c
+++ b/shallow.c
@@ -191,6 +191,9 @@ struct commit_list *get_shallow_commits_by_rev_list(int ac, const char **av,
 		die("revision walk setup failed");
 	traverse_commit_list(&revs, show_commit, NULL, &not_shallow_list);
 
+	if (!not_shallow_list)
+		die("no commits selected for shallow requests");
+
 	/* Mark all reachable commits as NOT_SHALLOW */
 	for (p = not_shallow_list; p; p = p->next)
 		p->item->object.flags |= not_shallow_flag;