Cabal dependency extrema testing

[Bram Neijt]

Ok, so I had my first go at this, but it seems all the things I try
will fail. My approach was simple: take a single dependency and change
">=" into "==" for that single dependency, then try to build. Do that
for every dependency in the cabal file.

Turns out, none of the things I tries would work. Here is a concrete example:
mkdir test
cd test
snap init
#Edit the test.cabal file and change bytestring >= 0.9.1 to bytestring == 0.9.1
cabal fetch .

This fails, telling me:
$ cabal fetch .
Resolving dependencies...
cabal: Could not resolve dependencies:
trying: test-0.1 (user goal)
next goal: xmlhtml (dependency of test-0.1)
rejecting: xmlhtml-0.2.0.3/installed-4c6... (conflict: xmlhtml =>
bytestring==0.10.0.1/installed-7e2..., test => bytestring==0.9.1 && <0.11)
trying: xmlhtml-0.2.1
trying: unordered-containers-0.2.3.0/installed-7fe... (dependency of
xmlhtml-0.2.1)
next goal: hashable (dependency of
unordered-containers-0.2.3.0/installed-7fe...)
rejecting: hashable-1.2.0.2/installed-bbd... (conflict: unordered-containers
=> hashable==1.1.2.5/installed-d93...)
rejecting: hashable-1.1.2.5/installed-d93... (conflict: hashable =>
bytestring==0.10.0.1/installed-7e2..., test => bytestring==0.9.1 && <0.11)
rejecting: hashable-1.2.0.10, 1.2.0.9, 1.2.0.8, 1.2.0.7, 1.2.0.6, 1.2.0.5,
1.2.0.4, 1.2.0.3, 1.2.0.2, 1.2.0.1, 1.2.0.0, 1.1.2.5, 1.1.2.4, 1.1.2.3,
1.1.2.2, 1.1.2.1, 1.1.2.0, 1.1.1.0, 1.1.0.0, 1.0.1.1, 1.0.1.0, 1.0.0
(conflict: unordered-containers => hashable==1.1.2.5/installed-d93...)


Am I donig something wrong, or does this just mean that the bytstring
dependency should be fixed to something above 0.9.1?

Greetings,

Bram

On Wed, Jun 12, 2013 at 9:29 AM, Erik Hesselink <hesselink at gmail.com> wrote:
> On Wed, Jun 12, 2013 at 12:16 AM, Roman Cheplyaka <roma at ro-che.info> wrote:
>> * Roman Cheplyaka <roma at ro-che.info> [2013-06-12 01:10:56+0300]
>>> * Roman Cheplyaka <roma at ro-che.info> [2013-06-12 01:05:29+0300]
>>> > * Bram Neijt <bneijt at gmail.com> [2013-06-11 23:15:39+0200]
>>> > > Hi all,
>>> > >
>>> > > I think it would be interesting to test build a package with the
>>> > > "latest" and "oldest" allowed dependencies, to see if the dependency
>>> > > boundaries hold. For example, build the text[1] package with version
>>> > > 0.2 of test-framework-hunit (oldest allowed according to .cabal file)
>>> > > to see if that is still works.
>>> > >
>>> > > Does anybody know of previous work on that?
>>> > > Does anybody have pointers on how to build with a specific version set?
>>> > > What is the easiest way to parse the dependencies in the cabal file,
>>> > > API pointers are also very much appreciated :)
>>> >
>>> > I believe Bram Schuur (CC'd) worked on this during OdHac.
>>>
>>> Trying his another email...
>>
>> Still no luck. This is his github account, maybe try to reach him there:
>> https://github.com/craffit
>
> I believe this address still works.
>
> Regards,
>
> Erik
>
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