Add traverse path filter for Linux #112
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… only. Use fromRawFilePath.
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Currently the implementation of FSNotify on Linux traverses through all subdirectories and call
INo.addWatch(inotify_add_watch) recursively on all directories. This crashes applications when a really unwanted directory (for example, one containing broken symlinks) is scanned, and may cause performance problems.(See srid/unionmount#9 , where
.direnvand therefore a wholenixpkgsis scanned.)In this patch, a
confPathFilteris added toWatchConfigto allow users to hold the library back from traversing down unwanted directories.