[Distutils] PEP 376 -- new round

[Carl Meyer]

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Reinout van Rees wrote:
> Debian/ubuntu has a mechanism to clean up packages that were once
> installed to satisfy dependencies but that aren't needed anymore.
>
> The handiest course of action is probably looking up how they do it.
> (/me doesn't know now it works internally, btw)

Apt has a file, /var/lib/apt/extended_states, which stores an
"Auto-Installed" flag with same semantics as the REQUESTED flag
(inverted). Though there are issues with the flag not being set
correctly for base-system packages, and not all tools take advantage of
the flag, the stored metadata is the same.

Carl
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