[Hackage] #490: cabal unpack gives bad error message for unsatisfiable constraints
#490: cabal unpack gives bad error message for unsatisfiable constraints ----------------------------------+----------------------------------------- Reporter: duncan | Owner: Type: defect | Status: new Priority: normal | Milestone: cabal-install-0.6 Component: cabal-install tool | Version: 1.6.0.1 Severity: normal | Keywords: Difficulty: very easy (<1 hour) | Ghcversion: Platform: | ----------------------------------+----------------------------------------- The simple use case works fine: {{{ $ cabal unpack HaXml Downloading HaXml-1.13.3... Unpacking HaXml-1.13.3... }}} But we also allow constraints and that does not necessarily work: {{{ $ cabal unpack HaXml-1.19.6 cabal: List.maximumBy: empty list }}} The problem is that the index does not contain `HaXml-1.19.6`. After a `cabal update` it is fine. In general this would happen for any user- supplied version constraint that turns out to be unsatisfiable. The function `resolvePackages` in `Distribution.Client.Unpack` does not consider the possibility that a dependency may be unsatisfiable. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/490 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects
#490: cabal unpack gives bad error message for unsatisfiable constraints ---------------------------------+------------------------------------------ Reporter: duncan | Owner: Type: defect | Status: new Priority: normal | Milestone: cabal-install-0.6 Component: cabal-install tool | Version: 1.6.0.1 Severity: normal | Resolution: Keywords: | Difficulty: very easy (<1 hour) Ghcversion: | Platform: ---------------------------------+------------------------------------------ Comment (by Saizan): With the attached patch we have: {{{ $ cabal unpack haxml-1.20 cabal: There is no available version of HaXml that satisfies ==1.20 }}} {{{ $ cabal unpack containers haxml-1.20 array 'containers-0.2.0.0' is cached. Unpacking containers-0.2.0.0... cabal: There is no available version of HaXml that satisfies ==1.20 }}} {{{ $ cabal unpack containers nonexistant cabal: There is no package named nonexistant }}} So, non-existant package names make unpack die early, while non-resolvable deps for existing packages make it die on the first one encountered while fetching, like other fetching-related problems (e.g. downloading or extracting). -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/490#comment:1 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects
#490: cabal unpack gives bad error message for unsatisfiable constraints
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Reporter: duncan | Owner:
Type: defect | Status: closed
Priority: normal | Milestone: cabal-install-0.6
Component: cabal-install tool | Version: 1.6.0.1
Severity: normal | Resolution: fixed
Keywords: | Difficulty: very easy (<1 hour)
Ghcversion: | Platform:
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Changes (by duncan):
* status: new => closed
* resolution: => fixed
Comment:
Applied, thanks.
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Sun Feb 8 16:52:40 GMT 2009 Andrea Vezzosi
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