I noticed today that if you leave off the branch name from git subtree like so: $ git subtree add --prefix somewhere -m "adding CDH as subtree" path/to/repo warning: read-tree: emptying the index with no arguments is deprecated; use --empty fatal: just how do you expect me to merge 0 trees? The error message is not particularly helpful (and seems to actually be in read-subtree?) The solution in my case was to add the branch name on the end of the command. Ideally it would be better to emit an error-message from a script higher up the calling chain that would be more descriptive about the problem (such as suggesting no branch is specified).-- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html