stack builds happy again and again #3151
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This appears with at least the following 3 stack versions:
The version 1.3.2 reported to work is: |
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fwiw, i believe this can be reproduced faster with:
however, something very strange is going on, for me at least, when playing around with this, and i can only guess it's related to nix somehow i somehow managed to get happy to build (and not be found to be missing subsequently; i just set up a empty project and just built nevertheless, i still get the following: my stack version: (note: i'm quite naive at nix; i've not used it much) |
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I confirm the fact that issue is present on |
Looks like its building happy multiple times during the same build - if that was meant. That triggers other dependencies to be rebuild as well EDIT Seems like its working ok on |
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Could this be somehow related to #3178? |
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OK, the problem here is the same with The upstream packages are wrong because they do not list their
A workaround is to simply put Why does this work? Because even though there hasn't been a Hackage release with the fix, there has been a Hackage revision that changes the package without changing the version number http://hackage.haskell.org/package/entropy-0.3.7/revisions/, thus triggering different behaviour even though the version is apparently the same. In my opinion this practice of non-maintainers silently fixing up other people's packages is highly confusing. and has cost us lots of hours to figure out what would have taken 5 minutes if there had been a proper version bump. For This problem exists for all built tools that use Hackage, be it To me the solution is clear: We should stop silently fixing packages on Hackage, and instead make proper fixed upstream releases and Hackage uploads. |
domenkozar
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Jun 22, 2017
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@domenkozar The wording might be slightly confusing for other readers:
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The comment about |
Merged
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I've tested this repro with the new extensible-snapshots branch (PR #3249), and I no longer see the behavior of |
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Closing now that #3249 is merged. |
mgsloan
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Aug 20, 2017
Motivated from this build failure on HEAD: * https://travis-ci.org/commercialhaskell/stack/jobs/266365181 Related to #3178. This fix is based on a comments from: * #3178 (comment) * #3151 (comment)
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We found a situation where stack seems to build the same thing over and over again.
To reproduce, use this branch: https://github.com/input-output-hk/cardano-sl/tree/vanya (commit
9f57d759) and build withThe build should fail at the end with a linker error (expected), and building again will build
happyagain:In particular, it says
missing dependencies: happyeven though it seems to have installed it just fine before.I think the reason is that after
happy-1.19.5: copy/register, I get this:I even checked this with a Ctrl-Z directly after
happy-1.19.5: copy/register, and still had it not appear in the ghc-pkg.Somebody else reports:
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