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Block KRB5CCNAME from inheriting into sandbox
If this environment variable is set on the host, it's going to mess up authentication in the sandbox. For example, if the host has: KRB5CCNAME=KCM: then the sandboxed process will try to use the host KCM socket, which is not available in the sandboxed environment, rather than the gssproxy socket that we want it to use. We need to unset it to ensure that whatever configuration we ship in the runtime gets used instead. We have switched the GNOME runtime to use an empty krb5.conf and it works as long as we don't break it with this environment variable meant for the host.
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