Cabal- A framework for packaging Haskell software





This has code for checking for various problems in packages. There is one set of checks that just looks at a PackageDescription in isolation and another set of checks that also looks at files in the package. Some of the checks are basic sanity checks, others are portability standards that we'd like to encourage. There is a PackageCheck type that distinguishes the different kinds of check so we can see which ones are appropriate to report in different situations. This code gets uses when configuring a package when we consider only basic problems. The higher standard is uses when when preparing a source tarball and by hackage when uploading new packages. The reason for this is that we want to hold packages that are expected to be distributed to a higher standard than packages that are only ever expected to be used on the author's own environment.


Package Checking

data PackageCheck Source

Results of some kind of failed package check.

There are a range of severities, from merely dubious to totally insane. All of them come with a human readable explanation. In future we may augment them with more machine readable explanations, for example to help an IDE suggest automatic corrections.



This package description is no good. There's no way it's going to build sensibly. This should give an error at configure time.


explanation :: String

A problem that is likely to affect building the package, or an issue that we'd like every package author to be aware of, even if the package is never distributed.


explanation :: String

An issue that might not be a problem for the package author but might be annoying or determental when the package is distributed to users. We should encourage distributed packages to be free from these issues, but occasionally there are justifiable reasons so we cannot ban them entirely.


explanation :: String

An issue that is ok in the author's environment but is almost certain to be a portability problem for other environments. We can quite legitimately refuse to publicly distribute packages with these problems.


explanation :: String


checkPackage :: GenericPackageDescription -> Maybe PackageDescription -> [PackageCheck]Source

Check for common mistakes and problems in package descriptions.

This is the standard collection of checks covering all apsects except for checks that require looking at files within the package. For those see checkPackageFiles.

It requires the GenericPackageDescription and optionally a particular configuration of that package. If you pass Nothing then we just check a version of the generic description using flattenPackageDescription.

Checking package contents

checkPackageFiles :: PackageDescription -> FilePath -> IO [PackageCheck]Source

Sanity check things that requires IO. It looks at the files in the package and expects to find the package unpacked in at the given filepath.

checkPackageContent :: Monad m => CheckPackageContentOps m -> PackageDescription -> m [PackageCheck]Source

Sanity check things that requires looking at files in the package. This is a generalised version of checkPackageFiles that can work in any monad for which you can provide CheckPackageContentOps operations.

The point of this extra generality is to allow doing checks in some virtual file system, for example a tarball in memory.

data CheckPackageContentOps m Source

A record of operations needed to check the contents of packages. Used by checkPackageContent.

checkPackageFileNames :: [FilePath] -> [PackageCheck]Source

Check the names of all files in a package for portability problems. This should be done for example when creating or validating a package tarball.