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	Tue, 30 Mar 2021 11:36:39 -0700 (PDT)
Subject:	Re: How to uninstall packages that were installed as dependency but
	are no longer required
To:	cygwin AT cygwin DOT com
References:	<20210330 DOT 145159 DOT 2203755649720422295 DOT yasu AT utahime DOT org>
	<4c3c2dc4-6de3-9a3b-b39a-986e651275c3 AT gmail DOT com>
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Date:	Tue, 30 Mar 2021 20:36:37 +0200
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From:	Marco Atzeri via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
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On 30.03.2021 19:18, Brian Inglis wrote:
> On 2021-03-30 02:07, Marco Atzeri via Cygwin wrote:
>> On 30.03.2021 07:51, Yasuhiro Kimura wrote:
>>> If you repeat the update of installed Cygwin packages for a while,
>>> it's quite possible that there are some packages that were installed
>>> as dependency but are no longer required by any others.
>>>
>>> Then is there any way to detect and uninstall such ones?
>>>
>>> I expect such way as `apt autoremove` of Debian or `dnf autoremove` of
>>> Fedora.
> 
>> as currently we are not tracking between choosen packages
>> and installed by dependency, Cygwin is lacking such capabilities
> 
> The undocumented third field in installed.db is automatic dependency 0 / 
> manually picked 1:
> 
> $ sort -k3 /etc/setup/installed.db | uniq -cf2
>           1 INSTALLED.DB 3
>        1203 _autorebase _autorebase-001007-1.tar.bz2 0
>         467 aalib aalib-1.4rc5-12.tar.bz2 1
> 

it really depends on the history of the package,
I have tons of package with "0" that in reality were picked
long time ago.
So it is not 100% trustable on long time installation

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