Replace validation logic for data-dir in pt-osc to use innodb_directories. #1023
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Current validation checks that the directory exists and is writable by the user running pt-osc. This does not make sense because the tool can be executed remotely, and even locally, access is not required for the user running the tool. What is required is that the directory exists in
innodb_directories.This change removes the old validation and checks if the directory passed in data-dir exists.