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pathspec: die on empty strings as pathspec
An empty string as a pathspec element matches all paths. A buggy script, however, could accidentally assign an empty string to a variable that then gets passed to a Git command invocation, e.g.: path=... compute a path to be removed in $path ... git rm -r "$path" which would unintentionally remove all paths in the current directory. The fix for this issue comprises of two steps. Step 1, which warns that empty strings as pathspecs will become invalid, has already been implemented in commit d426430 ("pathspec: warn on empty strings as pathspec", 2016-06-22). This patch is step 2. It removes the warning and throws an error instead. Signed-off-by: Emily Xie <email@example.com> Reported-by: David Turner <firstname.lastname@example.org> Signed-off-by: Junio C Hamano <email@example.com>
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