August 2010 - cabal-devel

[Hackage] #661: optionally select the oldest available dependencies rather than the newest
by Hackage 20 Apr '12

20 Apr '12

#661: optionally select the oldest available dependencies rather than the newest ----------------------------+----------------------------------------------- Reporter: benmachine | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: Cabal library | Version: 1.6.0.3 Severity: normal | Keywords: Difficulty: unknown | Ghcversion: Platform: | ----------------------------+----------------------------------------------- When developing a package, you want to specify as wide a range of build- depends as possible, but it's often quite tedious to keep checking if your latest development effort hasn't made your package incompatible with some ancient version of a library you use. In view of this I think it would be helpful to have an option that asks cabal configure to pick the oldest possible version of each dependency, so you could quickly and easily ensure that at least the two endpoints are covered. -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/661> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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[Hackage] #695: cabal install world always reinstalls programs
by Hackage 16 Apr '12

16 Apr '12

#695: cabal install world always reinstalls programs ---------------------------------+------------------------------------------ Reporter: duncan | Owner: Type: defect | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: Severity: normal | Keywords: Difficulty: easy (<4 hours) | Ghcversion: Platform: | ---------------------------------+------------------------------------------ cabal-install does not currently track the installed state of programs. It does now list them in the world file however. This leads to it always wanting to reinstall programs. Probably we do want to keep the programs in the world file, since we hopefully will track programs better in future. The temporary hack would be to filter out packages that have no lib when retrieving packages from the world file. -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/695> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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[Hackage] #694: mention --constraint flag in error essage when dep planning fails
by Hackage 16 Apr '12

16 Apr '12

#694: mention --constraint flag in error essage when dep planning fails ---------------------------------+------------------------------------------ Reporter: duncan | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: Severity: normal | Keywords: Difficulty: easy (<4 hours) | Ghcversion: Platform: | ---------------------------------+------------------------------------------ Dependency planning problems can often be solved by running with --dry-run -v, seeing what the planner is selecting and forcing it to make different choices using the --constraint flag. When dependency planning fails with particular kinds of constraint problem, it may be useful to users to mention this. We should check if this advice applies to all cases where the dep planner fails, or if its only appropriate for certain classes of failure. -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/694> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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[Hackage] #731: Custom Build-type with --package-db and --global encounters runtime error
by Hackage 28 Mar '12

28 Mar '12

#731: Custom Build-type with --package-db and --global encounters runtime error ---------------------------------+------------------------------------------ Reporter: cygnus | Owner: Type: defect | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: 1.8.0.4 Severity: normal | Keywords: Difficulty: unknown | Ghcversion: 6.12.2 Platform: Linux | ---------------------------------+------------------------------------------ To reproduce: * Run `cabal init`, change `Build-type` to `Custom` (`Setup.hs` already provided by `cabal init`) * Run `ghc-pkg init db` * Run `cabal configure --package-db=./db --global` * Output: {{{ Resolving dependencies... cabal: internal error: unexpected package db stack }}} In `cabal-install-0.8.2`, this appears to be caused by the code on lines 112-114 of `Distribution.Client.Configure`: {{{ usePackageDB = if UserPackageDB `elem` packageDBs then packageDBs else packageDBs ++ [UserPackageDB] }}} in combination with the code on lines 297-306 of `Distribution.Client.SetupWrapper`: {{{ ghcPackageDbOptions :: PackageDBStack -> [String] ghcPackageDbOptions dbstack = case dbstack of (GlobalPackageDB:UserPackageDB:dbs) -> concatMap specific dbs (GlobalPackageDB:dbs) -> "-no-user-package-conf" : concatMap specific dbs _ -> ierror where specific (SpecificPackageDB db) = [ "-package-conf", db ] specific _ = ierror ierror = error "internal error: unexpected package db stack" }}} Essentially, the order of the package databases in the stack is not as expected since the list already contains a `SpecificPackageDB` when the `UserPackageDB` is appended. (Note: this applies to GHC 6.12.3 and Cabal 1.8.0.6 on my system, but I could not select those versions in the ticket properties.) -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/731> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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[Hackage] #675: template-haskell cannot be upgraded (broken data-accessor-template)
by Hackage 05 Mar '12

05 Mar '12

#675: template-haskell cannot be upgraded (broken data-accessor-template) ---------------------------------+------------------------------------------ Reporter: guest | Owner: Type: defect | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: HEAD Severity: normal | Keywords: Difficulty: unknown | Ghcversion: 6.12.1 Platform: | ---------------------------------+------------------------------------------ data-accessor-template-0.2.1.3 has flags in the cabal file on template- haskell versions, which makes it broken for cabal-install on ghc-6.12: cabal-install tries to install template-haskell-2.3, which fails (and it can't be expected to succeed because TH is integrated into ghc due to quotes) You can work around the build failure with: {{{ cabal install data-accessor-template --constraint='template-haskell >= 2.4' }}} cabal-install ought to know that template-haskell isn't something it should install (as it does with base). -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/675> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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[Hackage] #665: Confusion situation when linking ./dist/setup/setup is interrupted
by Hackage 05 Mar '12

05 Mar '12

#665: Confusion situation when linking ./dist/setup/setup is interrupted ---------------------------------+------------------------------------------ Reporter: duncan | Owner: Type: defect | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: 1.6.0.3 Severity: normal | Keywords: Difficulty: unknown | Ghcversion: Platform: | ---------------------------------+------------------------------------------ If one accidentally interrupts cabal when it's linking `./dist/setup/setup` then you can end up with the file existing it not being executable. This leads to a confusing situation for the user. Running `cabal install` or `cabal configure` will fail silently. Running with -v indicates that something returns exit code 127. This corresponds to a permission error when trying to execute `./dist/setup/setup` Two improvements could be made: * Report the failure to execute `./dist/setup/setup` * If ghc is interrupted when creating `./dist/setup/setup`, cabal should delete the file, if it exists. That way, cabal will recompile on the next invocation. -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/665> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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[Hackage] #669: Allow cabal-install's package build location to be set
by Hackage 05 Mar '12

05 Mar '12

#669: Allow cabal-install's package build location to be set ---------------------------------+------------------------------------------ Reporter: duncan | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: Severity: normal | Keywords: Difficulty: unknown | Ghcversion: Platform: | ---------------------------------+------------------------------------------ Apparently some systems mount /tmp such that one cannot create and run executables. This is clearly problematic for cabal-install because it needs somewhere to build packages. http://article.gmane.org/gmane.comp.lang.haskell.cafe/73517 It may be useful for cabal-install to have a config setting to specify where to do package builds (for downloaded packages). If not specified this would default to the temp dir as now. -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/669> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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[Hackage] #670: cabal-install should warn about common problem after installing progs
by Hackage 05 Mar '12

05 Mar '12

#670: cabal-install should warn about common problem after installing progs ---------------------------------+------------------------------------------ Reporter: duncan | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: 1.6.0.3 Severity: normal | Keywords: Difficulty: easy (<4 hours) | Ghcversion: Platform: | ---------------------------------+------------------------------------------ There are a few common problems have when installing programs. * target bindir (or symlink-bindir) is not on the `$PATH` so they cannot run the program after installation. * target bindir is on the `$PATH` but the installed program is masked by the presence of the same named prog in a dir that is earlier on the `$PATH`. For example `/usr/local/bin/cabal` and `~/.cabal/bin/cabal`, the latter might have just been installed but the earlier one will still be picked up. * the shell keeping a cache of name -> path and so not picking up a new program. Eg in the above example, even if `~/.cabal/bin/` comes first on the `$PATH`, if bash has the mapping `cabal` -> `/usr/local/bin/cabal` then it will not notice when `~/.cabal/bin/cabal` is installed. The fix here is to run `hash -r`. The only time we might want to tell users to run `hash -r` is if the program did not previously exist and if it gets installed in a location that is earlier on the `$PATH` than an existing installed instance (which may thus be in the cache). Sadly we cannot query sh to find out what its cache holds. -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/670> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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[Hackage] #672: 'cabal init' command should allow for multiple entries in the Category field
by Hackage 05 Mar '12

05 Mar '12

#672: 'cabal init' command should allow for multiple entries in the Category field ---------------------------------+------------------------------------------ Reporter: byorgey | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: Severity: minor | Keywords: init, categories Difficulty: easy (<4 hours) | Ghcversion: Platform: | ---------------------------------+------------------------------------------ The .cabal format allows multiple categories (e.g. Data, Network, Math, etc.) to be listed in the Category field, but the 'cabal init' interactive mode only lets the user choose a single category. It would be nice to allow the user to choose multiple categories. -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/672> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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[Hackage] #673: cabal init: fail gracefully if bogus files are found during recursive search for source code
by Hackage 05 Mar '12

05 Mar '12

#673: cabal init: fail gracefully if bogus files are found during recursive search for source code ---------------------------------+------------------------------------------ Reporter: byorgey | Owner: Type: defect | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: Severity: normal | Keywords: init, search, file, crash Difficulty: easy (<4 hours) | Ghcversion: 6.12.1 Platform: Mac OS | ---------------------------------+------------------------------------------ cabal init does a recursive search looking for things that look like Haskell modules to be added to the exports list. The following error messages were reported by Ivan Miljenovic: {{{ cabal: /scratch/ghc-6.12.1/distrib/installer-scripts/MacOS: does not exist cabal: /tmp/pulse-a7kaqGHss6Yh/native: inappropriate type }}} Not sure exactly what causes these errors, but in any case cabal init should not crash. -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/673> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects

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