自制程序：在安装公式之前已修改PATH env var（Mercurial将使用系统python而不是自制程序python）

Question

Trying to use Homebrew on Mac OS X 10.9 to install mercurial and make sure it's using homebrew python version.

I've updated /etc/paths to list /usr/local/bin before /usr/bin .

Installed python 2.7.9 using brew install python , the python executable is located at /usr/local/bin/python which is a symlink to /usr/local/Cellar/python/2.7.9/bin/python .
When I type which python or python -V I'm getting the homebrew python version.

Later, when I run brew install mercurial the installed file /usr/local/bin/hg shebang ( #! ) points to the system python /usr/bin/python .
This is happening because mercurial python package installer (distutils) is using the PATH variable to hardcode the path to python in shebang instead of #!/usr/bin/env python .

When I check my PATH environment variable I see /usr/local/bin before /usr/bin , but if I try to install a brew package interactively: brew install -i mercurial I get a shell with a different PATH variable without /usr/local/bin at all.

How can I install mercurial to make sure it will use the homebrew version of python ? I prefer a way that would survive mercurial package upgrades as well.

Answer 1

By default the formula only uses system Python. You can bypass Superenv (which sanitizes PATH) and it should pick up whatever is in PATH when building from source:

$ brew reinstall mercurial --build-from-source --env=std
$ head -n 1 /usr/local/bin/hg  
#!/usr/local/opt/python/bin/python2.7