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<p>Hi Simon,</p>
<p>I see, you triggered another feature/bug of cabal install, namely
when you are in a project directory, project settings affect
solving process. And when there's a .cabal file, it's a project.<br>
So cabal tried to find an install plan containing local packages
(that makes sense, if you try to install local lhs2tex for
example!)<br>
<br>
Solution is to change directory (cd) somewhere else and try again.
(There's also cabal install -z flag feature request, -z to ignore
local project; but it's not yet merged).</p>
<p>- Oleg<br>
</p>
<div class="moz-cite-prefix">On 31.5.2019 11.02, Simon Peyton Jones
wrote:<br>
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<p class="MsoNormal">Thanks Oleg<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">my first guess
is that: when working on the unsaturated type families paper,
you did `cabal install --lib report`; or something similar.
`report` is probably some internal library to that paper /
project.<o:p></o:p></p>
<p class="MsoNormal">I am confident I did nothing like that.
But there is a file called report.cabal in the directory where
I did the ‘cabal install lhs2tex’ command.<span
style="color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt">To confirm,
check what is in your
~/.ghc/x86_64-linux-8.6.5/environments/default (or similar),
is some `package-id report-0.1.0.0-hexhash` line there?<o:p></o:p></p>
<p class="MsoNormal">There is no such file:<o:p></o:p></p>
<p class="Code">bash$ ls ~/.ghc<o:p></o:p></p>
<p class="Code">ghci_history x86_64-linux-8.9.0.20190414
x86_64-linux-8.9.0.20190508<o:p></o:p></p>
<p class="Code">x86_64-linux-8.6.4 x86_64-linux-8.9.0.20190430
x86_64-linux-8.9.0.20190527<o:p></o:p></p>
<p class="Code">bash$ ls ~/.ghc/x86_64-linux-8.6.4/<o:p></o:p></p>
<p class="Code">package.conf.d<o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0cm
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<p class="MsoNormal"
style="margin:0cm;margin-bottom:.0001pt"><b><span
style="color:windowtext;mso-fareast-language:EN-GB"
lang="EN-US">From:</span></b><span
style="color:windowtext;mso-fareast-language:EN-GB"
lang="EN-US"> Oleg Grenrus <a class="moz-txt-link-rfc2396E" href="mailto:oleg.grenrus@iki.fi"><oleg.grenrus@iki.fi></a>
<br>
<b>Sent:</b> 30 May 2019 20:19<br>
<b>To:</b> Simon Peyton Jones
<a class="moz-txt-link-rfc2396E" href="mailto:simonpj@microsoft.com"><simonpj@microsoft.com></a>; <a class="moz-txt-link-abbreviated" href="mailto:cabal-devel@haskell.org">cabal-devel@haskell.org</a><br>
<b>Subject:</b> Re: Cabal install<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>Hi Simon,<br>
<br>
my first guess is that: when working on the unsaturated type
families paper, you did `cabal install --lib report`; or
something similar. `report` is probably some internal
library to that paper / project.<br>
<br>
In that case, you are hitting the unfortunate cabal bug [1].<br>
<br>
To confirm, check what is in your
~/.ghc/x86_64-linux-8.6.5/environments/default (or similar),
is some `package-id report-0.1.0.0-hexhash` line there? If
so, the simplest fix is to remove that environment file.<br>
<br>
- [1] <a
href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fhaskell%2Fcabal%2Fissues%2F5888&data=02%7C01%7Csimonpj%40microsoft.com%7C5a4d4dc3dc214b29d8f408d6e533b91b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636948407671672464&sdata=OH3R%2Fl9xP6d2w8OUQ8V%2FUa%2Bp%2FEpDeqyy%2FWWBxTJ7Q%2BQ%3D&reserved=0"
moz-do-not-send="true">
https://github.com/haskell/cabal/issues/5888 </a><a
href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fhaskell%2Fcabal%2Fissues%2F5559&data=02%7C01%7Csimonpj%40microsoft.com%7C5a4d4dc3dc214b29d8f408d6e533b91b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636948407671682461&sdata=%2Fo%2FL6ZWU%2Bt2fA1CDGqjHL7RU1FFHGbIJacPzLNctZyE%3D&reserved=0"
moz-do-not-send="true">https://github.com/haskell/cabal/issues/5559<span
style="color:blue"><br>
</span></a><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p>Cheers,<br>
Oleg<o:p></o:p></p>
<div>
<p class="MsoNormal">On 30.5.2019 16.50, Simon Peyton Jones
wrote:<o:p></o:p></p>
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<p class="MsoNormal">Dear friendly Cabal folk<o:p></o:p></p>
<p class="MsoNormal">Here’s what happened to me today<o:p></o:p></p>
<p class="Code">bash$ cabal install lhs2tex<o:p></o:p></p>
<p class="Code">cabal: Could not resolve dependencies:<o:p></o:p></p>
<p class="Code">[__0] next goal: report (user goal)<o:p></o:p></p>
<p class="Code">[__0] rejecting: report-0.1.0.0 (conflict:
requires UnsaturatedTypeFamilies)<o:p></o:p></p>
<p class="Code">[__0] fail (backjumping, conflict set:
report)<o:p></o:p></p>
<p class="Code">After searching the rest of the dependency
tree exhaustively, these were the<o:p></o:p></p>
<p class="Code">goals I've had most trouble fulfilling:
report<o:p></o:p></p>
<p class="MsoNormal">Crumbs. What is ‘report’? Why does it
need UnsaturatedTypeFamilies? I’m totally lost.<o:p></o:p></p>
<p class="MsoNormal">Then, in an inspired moment, I thought
to change to a different directory, ~/tmp.
<o:p></o:p></p>
<p class="MsoNormal">Then quite different things happened –
it downloaded and built relevant libraries.<o:p></o:p></p>
<p class="MsoNormal">I think that there just happened to be
a .cabal file in the original directory I was in at the
time. That appears to affect what ‘cabal install’ does in
a truly radical way.<o:p></o:p></p>
<p class="MsoNormal">My point is this: this is terribly
confusing for the user (at least for this on). I’d be
shocked if ‘apt install blah’ behaved utterly differently
in different directories. I’m going to make a little
empty directory somewhere, and cd to it before invoking
cabal in future. But that just feels like a workaround,
not a solution.<o:p></o:p></p>
<p class="MsoNormal">I’m not saying it’s wrong – just giving
you a data point that it had one user completely stumped<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="Code"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
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style="mso-fareast-language:EN-GB"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>cabal-devel mailing list<o:p></o:p></pre>
<pre><a href="mailto:cabal-devel@haskell.org" moz-do-not-send="true">cabal-devel@haskell.org</a><o:p></o:p></pre>
<pre><a href="https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fcabal-devel&data=02%7C01%7Csimonpj%40microsoft.com%7C5a4d4dc3dc214b29d8f408d6e533b91b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636948407671692458&sdata=vRr6UoW69Y0U7rGrYHm1XtbAH2jlFsArh21E7i0o6ko%3D&reserved=0" moz-do-not-send="true">http://mail.haskell.org/cgi-bin/mailman/listinfo/cabal-devel</a><o:p></o:p></pre>
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