So let's say I have a code checkout that I used --ignore-externals on originally. One of the directories has several large externals in it.
After having checked out my sparse copy, is there a way to retrieve just one of those externals? As far as I can tell, all I can do is svn up . and retrieve all the externals at once. --depth doesn't seem to work in this case, nor does svn up external_dir/ since it doesn't exist yet. I even tried faking it with mkdir external_dir/; svn up external_dir/, although I didn't really expect that one to work.
So, is it possible to retrieve/update only one external, rather than everything in the directory, if it was originally ignored?