[arch-haskell] Symlinks are screwed up in i686

Magnus Therning magnus at therning.org
Sat Feb 12 21:51:53 CET 2011

On Sat, Feb 12, 2011 at 02:25:56PM +0100, Peter Hercek wrote:
> On 02/11/2011 12:38 PM, Peter Simons wrote:
> >your recent update of the i686 tree screwed up the symlinks for 'repo.db'
> >again, which in turn broke my build. Furthermore, you've again deleted older
> >versions of the updated packages even though I repeatedly asked you not to.
> Is there a local access and is the naming policy strict enough so
> that the removal of the old packages can be handled by a simple
> script over the text listing of the repository directory?

Yes, there is local access, and yes it's easy to extract version info
from the filenames alone.  I've attached a script I use to list *all*
old versions of all packages in a directory; my typical usage is "rm

> If so then lets just write a script which keeps the last two
> versions of everything.

Feel free to modify the script.

> I already proposed this but there was no response and it looks like
> it is still an issue.

Well, to be rather blunt, it's an issue I don't care about at all, so
I was waiting for someone who cares to hack it up :-)


Magnus Therning                      OpenPGP: 0xAB4DFBA4 
email: magnus at therning.org   jabber: magnus at therning.org
twitter: magthe               http://therning.org/magnus
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#! /usr/bin/env runhaskell

module Main where

import System.Directory
import Control.Monad
import Data.List
import System.FilePath
import Distribution.Text
import Distribution.Version
import Data.Maybe
import qualified Data.Map as M

main = do
    files <- getDirectoryContents "." >>= filterM doesFileExist
    let pkgs = map splitFilename $ filter (isSuffixOf ".pkg.tar.xz") files
    let pkgmap = makeMap pkgs
    let mpkgs = M.filter ((> 1) . length) pkgmap
    mapM_ printToRemove $ M.elems mpkgs

data ArchPkg = ArchPkg
    { apFileName :: FilePath
    , apPackage :: String
    , apVersion :: Maybe Version
    , apRelease :: Int
    , apArch :: String
    } deriving (Eq, Show)

splitFilename fn = ArchPkg { apFileName = fn, apPackage = reverse pkg, apVersion = simpleParse $ reverse ver, apRelease = read $ reverse rel, apArch = reverse arch }
        revfnnoext = reverse $ (iterate dropExtension fn) !! 3
        (arch, (_:r1)) = break (== '-') revfnnoext
        (rel, (_:r2)) = break (== '-') r1
        (ver, (_:r3)) = break (== '-') r2
        pkg = r3

makeMap pkgs = mm M.empty pkgs
        mm m [] = m
        mm m (pkg:rest) = mm (M.insertWith' (++) (apPackage pkg) [pkg] m) rest

cmpAP a b = let
        verCmp = compare (apVersion a) (apVersion b)
        relCmp = compare (apRelease a) (apRelease b)
    in if verCmp /= EQ
        then verCmp
        else relCmp

printToRemove ps = mapM_ (putStrLn . apFileName) (tail $ reverse $ sortBy cmpAP ps)

-- vim: set ft=haskell :
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