如何修复自制权限？

Question

我已经卸载并安装了3次Homebrew现在，因为它似乎从来不允许我安装任何东西，因为它拒绝我的权限，在大多数安装结束。

作为示例，我将发布当前面临的libjpeg下载场景。

我尝试安装libjpeg并得到：

$ brew install libjpeg
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/jpeg-8d.mountain_lion.bottle.1.tar.gz
Already downloaded: /Library/Caches/Homebrew/jpeg-8d.mountain_lion.bottle.1.tar.gz
==> Pouring jpeg-8d.mountain_lion.bottle.1.tar.gz
Warning: Could not link jpeg. Unlinking...
Error: The brew link step did not complete successfully
The formula built, but is not symlinked into /usr/local
You can try again using `brew link jpeg'
Error: Permission denied - /usr/local/opt/jpeg

Error: Permission denied - /usr/local/opt/jpeg

$ brew doctor
Warning: "config" scripts exist outside your system or Homebrew directories.
./configure scripts often look for *-config scripts to determine if
software packages are installed, and what additional flags to use when
compiling and linking.

Having additional scripts in your path can confuse software installed via
Homebrew if the config script overrides a system or Homebrew provided
script of the same name. We found the following "config" scripts:

/Library/Frameworks/Python.framework/Versions/2.7/bin/python-config
/Library/Frameworks/Python.framework/Versions/2.7/bin/python2-config
/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7-config
Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run brew link on these:

jpeg

Answer 1

我能够通过在文件夹上使用chown来解决问题：

sudo chown -R "$USER":admin /usr/local

而且（很可能）必须对/library/caches/homebrew执行相同的操作：

sudo chown -R "$USER":admin /Library/Caches/Homebrew

显然，我以前使用过sudo，改变了我对/usr/local的文件夹权限，从现在开始，所有使用brew的安装都证明是成功的。