[GSoC] migration

[Joshua Root]

On 2017-8-6 22:11 , Umesh Singla wrote:
> On Sat, Jul 22, 2017 at 7:26 AM, Joshua Root <jmr at macports.org 
> <mailto:jmr at macports.org>> wrote:
> 
> 
>         For now, I'd like to ask in what order does "registry::entry
>         imaged" returns the port list? Because I'm running the sorting
>         function which the restore_ports.tcl uses but it's giving me the
>         ports in the same order as result.
> 
> 
>     Probably just ordered by rowid, i.e. might as well be random. Note
>     that the sort_ports proc from restore_ports.tcl does not take a list
>     of registry references like registry::entry returns, but a list of
>     strings representing port names, versions and variants in the format
>     generated by 'port installed'.
> 
> 
> `port installed` returns the result of `registry::entry imaged` sorted 
> in an alphabetical order, first by name, then version etc.

Yes. The order of the input lines doesn't matter for restore_ports.tcl 
of course because it's sorting them. My point was just that that 
particular sort procedure takes something like "zlib @1.2.11_0 (active)" 
as input, rather than "::registry::entry150".

> `registry::entry imaged` might be returning in a random order but 
> sorting it (with ports coming before their dependencies) doesn't change 
> the result at all.

This could easily be true in some cases but definitely not in the 
general case. Are you testing on real-world registry contents or just on 
an installation you created recently for testing? In the latter case, 
each port will happen to come before its dependents simply because 
dependencies are installed first. After some upgrading of ports over 
time, in practically random order, this will often no longer be the case.

Attached is a small script that I used to demonstrate that this property 
does not hold in my own registry. There, entry0 is fftw-3, and comes 
before its dependent entry243 (py27-numpy). On the other hand, entry267 
is py27-setuptools, which comes after its dependent entry76 (py27-nose).

- Josh
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