Avoid a possible recursive copy when destination (build_dir) is underneath source directory #1026
+17
−7
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If the user makes a mistake in config
mdbook
could have started a never-ending copy that only ends when your disk is full. This change avoids that.It also makes it possible to create a valid (if not recommended) configuration where your
build-dir
is underneath thesrc
directory. One reason for possibly wishing to do that is when you desiresrc
to be the root directory of a project.Relates to #1024