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Subject:	Re: Anecdotal: Rebase and Visual Studio 2015 and /etc
To:	cygwin AT cygwin DOT com
References:	<693uFCmXF1392S07 DOT 1467203045 AT web07 DOT cms DOT usa DOT net> <3334CBDB-BF42-4CDA-83B5-CCA5B251A746 AT etr-usa DOT com> <98C319EE-D0EF-48CD-85D7-3384DA5051A9 AT etr-usa DOT com> <44F329F2-C5FE-47D9-BCC5-BF7F9D85F68F AT etr-usa DOT com> <d83f0551-1a48-b723-f50e-9949bd395823 AT cornell DOT edu>
From:	Ken Brown <kbrown AT cornell DOT edu>
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Date:	Tue, 5 Jul 2016 09:59:03 -0400
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On 7/3/2016 10:02 AM, Ken Brown wrote:
> On 7/1/2016 7:38 PM, Warren Young wrote:
>> On Jul 1, 2016, at 4:40 PM, Warren Young wrote:
>>>
>>> I’ve written a script to do that automatically.
>>
>> I’ve improved the script so that it no longer requires any
>> parameters.  It finds the last-used setup.ini file and extracts the
>> list of currently-installed packages, all on its own.
>
> This script has a couple of problems.  First, it doesn't take dependency
> loops into account.  For example, if package p requires q and q requires
> p, then both will be marked as non-root.  Second, if the mirror was used
> for both an x86 and x86_64 installation, it always uses the x86
> setup.ini, regardless of the current architecture.

The second problem is easy to fix.  I think you can fix the first 
problem by using the dependency order computed by setup and recorded in 
/var/log/setup.log.full:

$ grep "Dependency order" /var/log/setup.log.full
Dependency order of packages: base-cygwin cygwin libdbus1_3 libiconv2 
libintl8 libffi6 libpcre1 liblzma5 libgcc1 libstdc++6 terminfo...

You should only mark a package as a non-root if it is required by a 
package that occurs later in the list.

Ken

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