Thu Aug 6 06:19:28 PDT 2009 Simon Marlow
* Add a unuque identifier for installed packages (part 1 of 9)
Ignore-this: b774e5719e666baee504e1f52381cc8b
NOTE: the patch has been split into 9 pieces for easy
reviewing, the individual pieces won't build on their own.
Part 1 does the following:
Distribution.Package:
- define the InstalledPackageId type as a newtype of String
Distribution.InstalledPackageInfo:
- add an installedPackageId field to InstalledPackageInfo
- change the type of the depends field from [PackageIdentifier]
to [InstalledPackageId]
The idea behind this change is to add a way to uniquely identify
installed packages, letting us decouple the identity of an installed
package instance from its package name and version. The benefits of
this are
- We get to detect when a package is broken because its
dependencies have been recompiled, or because it is being
used with a different package than it was compiled against.
- We have the possibility of having multiple instances of a
given <package>-<version> installed at the same time. In the
future this might be used for "ways". It might also be
useful during the process of upgrading/recompiling packages.
M ./Distribution/InstalledPackageInfo.hs -11 +10
M ./Distribution/Package.hs -3 +24
View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20090806131928-12142-5ef3fc82a...
