cabal可以不卸载软件包吗？ [英] Can cabal not un-install packages?

问题描述

那么卸载软件包的最佳方法是什么？

cabal help 显示这些不是卸载选项。由cabal安装？

 ％cabal update 
％cabal install mighttpd2 
  

mighttpd2安装成功。但是，ghc-pkg找不到&取消注册：

 ％ghc-pkg list | grep -i可能
％ghc-pkg取消注册mighttpd2 
 ghc-pkg：找不到包mighttpd2 
  

真诚！

 > find .cabal | grep -i mighttp 
 .cabal / share / doc / mighttpd2-2.3.3 
 .cabal / share / doc / mighttpd2-2.3.3 / LICENSE 
 .cabal / share / mighttpd2-2.3 .3 
 .cabal / share / mighttpd2-2.3.3 / sample.conf 
 .cabal / share / mighttpd2-2.3.3 / sample.route 
 .cabal / packages / hackage.haskell .org / mighttpd2 
 .cabal / packages / hackage.haskell.org / mighttpd2 / 2.3.3 
 .cabal / packages / hackage.haskell.org / mighttpd2 / 2.3.3 / mighttpd2-2.3.3 .tar.gz 
 
> ghc-pkg列表| grep -i package \.conf 
 /usr/local/lib/ghc-7.0.3/package.conf.d：
 /home/sw2wolf/.ghc/i386-freebsd-7.0.3 /package.conf.d：
  

所以.cabal / packages / hackage.haskell.org不能被ghc-pkg看到。

解决方案

您可能没有Cabal路径作为GHC路径的一部分。

第1步

首先，试着找出你的GHC包路径是什么，

  ghc-pkg list 
＃显示类似/home/username/.../package.conf.d的内容
  

然后，确保一个Cabal正在写信给活动。对我来说，Cabal添加软件包到

  /home/username/.ghc/x86_64-linux-7.0.4/package.conf .d 
  

第2步

如果有

  strace -f -o trace.txt cabal install mighttpd2 $ b在你的系统上没有这样的目录，看看Cabal写的是什么。 $ b greppackage \.cachetrace.txt 
  

然后将包路径添加到此系统环境变量

  export GHC_PACKAGE_PATH = NEWPATH：/usr/local/lib/ghc-7.0.3/package.conf.d 
  

再试一次，如果不行，请继续步骤3

第3步

查看该目录并查看是否有像

的文件

<$ p $如果它在那里，那么你在那里，然后你就可以使用它，然后你可以使用它来创建一个新的数据库文件。可能需要recache

  ghc-pkg recache --user 
  

cabal help shows thers isnot "uninstall" option.

then what's the best way to uninstall the packages installed by cabal ?

% cabal update
% cabal install mighttpd2

mighttpd2 is installed successfully. However the ghc-pkg cannot find & unregister it:

% ghc-pkg list | grep -i might
% ghc-pkg unregister mighttpd2
ghc-pkg: cannot find package mighttpd2 

Sincerely!

>find .cabal | grep -i mighttp
.cabal/share/doc/mighttpd2-2.3.3
.cabal/share/doc/mighttpd2-2.3.3/LICENSE
.cabal/share/mighttpd2-2.3.3
.cabal/share/mighttpd2-2.3.3/sample.conf
.cabal/share/mighttpd2-2.3.3/sample.route
.cabal/packages/hackage.haskell.org/mighttpd2
.cabal/packages/hackage.haskell.org/mighttpd2/2.3.3
.cabal/packages/hackage.haskell.org/mighttpd2/2.3.3/mighttpd2-2.3.3.tar.gz

>ghc-pkg list | grep -i package\.conf
 /usr/local/lib/ghc-7.0.3/package.conf.d:
 /home/sw2wolf/.ghc/i386-freebsd-7.0.3/package.conf.d:

So ".cabal/packages/hackage.haskell.org" cannot be seen by ghc-pkg.

解决方案

you might not have the Cabal path as part of your GHC path.

step 1

First, try to find out what your GHC package path is,

ghc-pkg list
    # displays stuff like "/home/username/.../package.conf.d"

then, make sure the one Cabal is writing to is active. For me, Cabal adds packages to

/home/username/.ghc/x86_64-linux-7.0.4/package.conf.d

step 2

If there is no such directory on your system, see what Cabal's writing.

strace -f -o trace.txt cabal install mighttpd2
grep "package\.cache" trace.txt

then add the package path to this system environment variable

export GHC_PACKAGE_PATH=NEWPATH:/usr/local/lib/ghc-7.0.3/package.conf.d

try again, if it doesn't work proceed to step 3

step 3

look in that directory and see if there's a file like

mighthttpd2-version-LONGHASHCODE.conf

if it's there, then you probably need to recache

ghc-pkg recache --user

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