#677: Error: Couldn't read cabal file "./HDBC/2.2.5/HDBC.cabal" ---------------------------------+------------------------------------------ Reporter: guest | Owner: Type: defect | Status: closed Priority: normal | Milestone: Component: cabal-install tool | Version: 1.6.0.3 Severity: normal | Resolution: fixed Keywords: | Difficulty: unknown Ghcversion: 6.10.4 | Platform: Linux ---------------------------------+------------------------------------------ Changes (by duncan): * status: new => closed * resolution: => fixed Comment: Fixed by editing the HDBC.cabal file for 2.2.5 and 2.2.6 on the server. The other workaround would have been to upgrade cabal-install. The problem is that the package was using the following syntax: {{{ Build-Depends: HUnit, QuickCheck (>= 2.0), testpack (>= 2.0) }}} But it only declared {{{ Cabal-Version: >=1.2.3 }}} When in fact this version range syntax (using parentheses) requires Cabal 1.8. The second problem is that the QA filters did not detect that this package was using the later syntax without properly declaring it. That is fixed by this patch {{{ Wed Jun 2 18:37:03 BST 2010 Duncan Coutts <duncan@haskell.org> * Fix QA check on version range syntax to detect use of ()'s The problem was that we do the QA check on using the new version range syntax after parsing. The new syntax allows ()'s but previously the code threw them away in the parser stage. We now retain them in the AST and deal with them appropriately. This now allows the QA check to be accurate and detect things like "build-depends: base (>= 4.2)". }}} The hackage server and new versions of cabal-install will report: {{{ HDBC-2.2.5 $ cabal check The following errors will cause portability problems on other environments: * The package uses full version-range expressions in a 'build-depends' field: testpack (>=2.0), QuickCheck (>=2.0). To use this new syntax the package needs to specify at least 'cabal-version: >= 1.8'. Alternatively, if broader compatibility is important, then convert to conjunctive normal form, and use multiple 'build-depends:' lines, one conjunct per line. Hackage would reject this package. }}} -- Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/677#comment:1> Hackage <http://haskell.org/cabal/> Hackage: Cabal and related projects