如何更改 cabal 存储文档的目录
我安装了一个带有前缀 $HOME/usr 的自定义 Haskell 工具链，因此编译器位于 $HOME/usr/bin/ghc 中，文档位于 $HOME 中/usr/share/doc/ghc/...。该工具链由 ghc 安装、cabal 安装以及您需要的所有库组成。我以某种方式设置了 $PATH，所有这些程序都在其中。我的系统上没有安装这些工具。
现在我尝试安装一些其他库。但当 cabal 尝试安装文档时，我总是遇到同样的错误：
~$ cabal install --global binary Resolving dependencies... Configuring binary-0.5.0.2... Preprocessing library binary-0.5.0.2... Building binary-0.5.0.2... ... snip ... Registering binary-0.5.0.2... cabal: /usr/local/share/doc: permission denied
我怎样才能告诉 cabal 文档应该放在哪里？我不想在 shell 中一次又一次地提供这些信息，所以最好是一个配置文件。我希望将所有与 haskell 相关的东西都放在我的主树中，以避免错误的命令破坏我的系统。
I installed a custom Haskell toolchain with the prefix $HOME/usr, so the compiler lives in $HOME/usr/bin/ghc and the documentation in $HOME/usr/share/doc/ghc/.... The toolchain consists of a ghc installation, a cabal installation and all the libs you need. I set up $PATH in a way, that all these programs are in it. There is no other installation of these tools on my system.
Now I tried to install some other libraries. But I always got the same error when cabal tried to install the documentation:
~$ cabal install --global binary Resolving dependencies... Configuring binary-0.5.0.2... Preprocessing library binary-0.5.0.2... Building binary-0.5.0.2... ... snip ... Registering binary-0.5.0.2... cabal: /usr/local/share/doc: permission denied
How can I tell cabal where the documentation should live? I don't want to give this information again and again in the shell, so the best would be a config file. I want to have all the haskell related stuff in my home tree, to avoid destroying my system with a wrong command.
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为什么要使用“--global”安装？默认情况下，这会将所有内容放入 /usr/local/ 中。如果您执行标准的每用户安装，文档将安装到您的主目录中，并且应该可以正常工作。
话虽如此，这可以通过文件进行配置。 cabal 配置文件通常位于
~/.cabal/config/。这是我的相关部分：您可以进行任何您喜欢的更改，只需确保取消注释这些行即可。还有一个“install-dirs user”部分，用于每用户安装。
Why are you installing with "--global"? By default this would put everything in /usr/local/. If you do a standard per-user install the docs will be installed into your home directory and it should work fine.
That being said, this is configurable via a file. The cabal config file is typically located at
~/.cabal/config/. Here's the relevant section of mine:You can make whatever changes you like, just be sure to uncomment the lines. There is also an "install-dirs user" section, which is used in per-user installs.
我同意海报的观点。为什么没有明确的文档说明如何操作
cabal安装包--全局
需要权限时提示输入 sudo 吗？
正在做
sudo cabal 安装包
是一个坏主意，因为这样你就以 root 身份构建包。并且您必须允许互联网连接写入 root 拥有的文件（您必须填充 /root/.cabal 或类似的内容）。
这是人们想要这样做的一个很好的理由：
如果我通过我的 Linux 包管理器安装 ghc 和 haskell 平台（这样做有充分的理由；），那么如果我执行 cabal 安装包
它不会识别全局识别的包。
I agree with the poster. Why is there no clear documentation for how to do
cabal install package --global
that prompts for sudo when permission is needed?
Doing
sudo cabal install package
is a bad idea because then you're building packages as root. And you have to allow an internet connection to write to a file owned by root (you will have to populate /root/.cabal or something like that).
Here is a good reason why one would want to do this:
If I install ghc and the haskell platform through my linux package manager (there are good reasons for this ;), then if I do cabal install package
it will not recognize the packages that globally recognized.
好吧，实际上有人发布了（几乎令人烦恼的）详细描述，说明如何进行全局安装（使用 --global 或 install-dirs global）而不会遇到权限错误。诀窍是在 cabal 配置文件中使用 root-cmd sudo 。
看，
http://jdgallag.wordpress.com/2011/05/14/cabal-install-to-global-using-sudo-but-do-not-build-as-root/
Well, someone actually posted a(n almost annoyingly) detailed description of how to do global installations (with either --global or install-dirs global) without running into permission errors. The trick is to use root-cmd sudo in the cabal config file.
See,
http://jdgallag.wordpress.com/2011/05/14/cabal-install-to-global-using-sudo-but-do-not-build-as-root/