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Fix hang on cyclic symlinks with -r -f - #4691
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With -r -f, the recursive directory walk follows symbolic links, so a symlink pointing back into an ancestor directory makes UTIL_prepareFileList loop forever and the CLI hangs. Track the (device, inode) of each directory on the current path and skip an entry whose target is already an ancestor. Fixes meta#4081.
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With
-r -f, zstd follows symbolic links while walking directories, so a symlink that points back into a directory it already sits in makes the walk loop forever and the CLI hangs.UTIL_prepareFileListnow records the (device, inode) of each directory on the current path and skips an entry whose target is already an ancestor, printing a warning. The new cli-test covers a cyclic symlink and a non-cyclic one.Fixes #4081.