On Fri, Apr 24, 2015 at 02:51:08PM +0100, SP wrote:
On 24/04/15 13:04, Magnus Therning wrote:
If I re-install ghc all information about installed packages is lost, on the ghc-level [..] When re-installing ghc these two databases aren't in sync anymore and using `pacman` to install results in errors on the `ghc-pkg` level. Basically, `pacman` won't re-install all dependencies, since they are already installed, but when registering with `ghc-pkg` it has no records of those dependencies.
Can we protect the system from such mistakes? I guess the ideal solution would be to rsync the databases somehow after ghc is reinstalled.
The only solution I can see is to do something clever in the ghc.install (`pre_upgrade` and `post_upgrade`). I'm not sure exactly what information is available though. One would probably need enough information to distinguish a re-install from an upgrade. I should add that you are the very first one ever to report this problem. Also, I'm still not clear on *why* `pacman` all of a sudden decides to re-install ghc on your system. If you figure out why, then that might very well be a more natural place to fix the issue than inside the ghc package. (I'm guessing random re-installs can happen for other packages on your system, though not with such disastrous effects.) /M -- Magnus Therning OpenPGP: 0xAB4DFBA4 email: magnus@therning.org jabber: magnus@therning.org twitter: magthe http://therning.org/magnus Unix is the answer, but only if you phrase the question very carefully. -- Unknown