freebsd / iocage / 12027166335

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Add hardening measures on untar (#49)

This adds hardening measures while untaring archives fetched
over the network (including FreeBSD tarballs and iocage plugins),
as implemented by TrueNAS, see:
https://github.com/truenas/iocage/pull/358

This reduces the impact of intentionally malicious or accidentally
broken archives.

Please note that users are still advised to only fetch from
trusted sources and make use of TLS to prevent MITM attacks.

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