Do not create new user namespace if we already have CAP_SYS_ADMIN#66
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…ew user namespace if we already have CAP_SYS_ADMIN
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Parse /proc/self/status to determine whether we already have CAP_SYS_ADMIN. If we do, then don't create a new user namespace unless explicitly requested. If parsing of /proc/self/status fails, or it doesn't exist, then assume zero capabilities and proceed as before.