问题
Some packages from brew require python@3.8 as a dependency. For example:
$ brew deps vim
gdbm
gettext
libyaml
lua
openssl@1.1
perl
python@3.8
readline
ruby
sqlite
xz
However, I want to manage all my python installations with pyenv and I would not like to download python@3.8 with brew. This would imply having to exactly same versions of python installed in 2 different locations, which I would like to avoid. Reading up on brew, pyenv and python I´ve come to understand that having python installed in different parts of the system may cause some trouble in the future, which I'd also like to avoid. Unfortunately I cannot seem to resolve the python dependency in brew packages through pyenv. Below follow the steps I've tried to overcome this.
I have installed pyenv with brew, and necessary python versions from there.
$ pyenv versions
system
* 3.8.2 (set by PYENV_VERSION environment variable)
I have tried solving this according to this Github discussion by setting a brew alias such as:
alias brew='env PATH=${PATH//$(pyenv root)\/shims:/} brew'
As that did not resolve the dependency issue, I tried create a link for python@3.8 in /usr/local/Cellar which would point to the pyenv python, somehow similar to this issue with:
ln -s ~/.pyenv/versions/3.8.2 $(brew --cellar python)@3.8
This did not work, so I have also tried adding the link to ´/usr/local/bin´:
ln -s ~/.pyenv/versions/3.8.2 /usr/local/bin/python@3.8
However, running brew info vim still shows that the python@3.8 dependency is not satisfied.
$ brew info vim
vim: stable 8.2.0900 (bottled), HEAD
Vi 'workalike' with many additional features
https://www.vim.org/
Conflicts with:
ex-vi (because vim and ex-vi both install bin/ex and bin/view)
macvim (because vim and macvim both install vi* binaries)
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/vim.rb
==> Dependencies
Required: gettext ✘, lua ✘, perl ✘, python@3.8 ✘, ruby ✘
Any ideas how can I link/connect my pyenv python installation to homebrew so that the additional python@3.8 is not installed? Or maybe solve the issue in another manner using pyenv global/local/shell? I am currently using macOs Catalina.
Any help is greatly appreciated!
回答1:
First of all, I appreciate the desire to keep redundancy to a minimum! I was sad to see no answers, but I think that I've figured it out. You can do this, though Homebrew warns against it and you're wading into the territory of relying on your own understanding to support this use case (as Homebrew states in their post). The SO issue you linked to has the right idea with the links, but from what I can tell they don't get the links quite right. I'm all for experimenting and learning (it's the only way?), so by all means go for it, but again you won't get much support if you're not able to dig into your own $PATH and follow the links that you've set up yourself.
If you already have any traces of Homebrew's python3, first get rid of them (brew unlink python3 and brew uninstall python3). If you already had python@3.8 from Homebrew, when uninstalling it, note the packages that depended on it (for example, ffmpeg), and reinstall them after.
As of this post, Homebrew is expected Python 3.8.6 for it's python@3.8, so first install that version with pyenv following their documentation:
pyenv install 3.8.6
That will put (by default) the actual Python install in
~/.pyenv/versions/3.8.6
Now we just need to add one link, and then let brew do the rest. I'll use full paths here, so you can run this from anywhere (and remember to read ln -s ... ... in your head as Link -Symbolic Target LinkName):
ln -s ~/.pyenv/versions/3.8.6 $(brew --cellar python)/3.8.6
With the -f flag, you could have omitted the trailing /3.8.6, as ln will use the name of the target. To be as explicit as possible on the link, you should have
ln -s ~/.pyenv/versions/3.8.6 /usr/local/Cellar/python@3.8/3.8.6
Here's what the result should look like:
➜ ~ ll $(brew --cellar python@3.8)
total 0
lrwxr-xr-x 1 [my username] admin 36B Oct 14 16:52 3.8.6 ->
/Users/[my username]/.pyenv/versions/3.8.6
Finally, let Homebrew manage the rest of necessary linking:
brew link python3
来源：https://stackoverflow.com/questions/62249443/linking-pyenv-python-to-homebrew-in-order-to-avoid-homebrew-python3-8-installat