Add conan.conanrc file to setup the conan user home

[czoido]

Closes: #11542

You can create a .conanrc file in the folder where you are running conan (or any parent folder), it can have this content:

Set the conan home to an absolute folder

# accepts comments
conan_home=/absolute/folder

Set the conan home to a relative folder inside the current folder

# accepts comments
conan_home=./relative folder/inside current folder

Set the conan home to a relative folder outside the current folder

# accepts comments
conan_home=../relative folder/outside current folder

Set the conan home to a path containing the ~ that will be expanded to the system's user home

# accepts comments
conan_home=~/use the user home to expand it

The .conanrc file is searched for in all parent folders so, if for example, in this structure:

.
.conanrc
├── project1
└── project2

And you are running from folder project1 the parent folders are traversed recursively until a .conanrc is found in case it exists.

[lasote]

The issue to be closed described also that we wanted to recover the "storage" path (different from the cache). Right?

[memsharded]

@lasote the storage path was already merged in #11672

[prince-chrismc]

This made playing with Conan 2.0 so much easier! ❤️

Now I just keep .conanrc in my root project folder with conan_home=~/.conan2 and magic 🧙 I get

$ conan config home
Current Conan home: /Users/christopherm/.conan2

👏

[memsharded]

@prince-chrismc To make things clear, .conan2 is already the default name in Conan 2.0 beta to avoid colliding with Conan 1.X. But the feature should work for other names too, please check

[prince-chrismc]

It does, conan_home=/tmp/meetup/.conan_two

Current Conan home: /Users/christopherm/.conan_two
 christopherm@christopherm-mac  ~/meetup   conan2 ±  conan config home
Initialized file: '/tmp/meetup/.conan_two/settings.yml'
Initialized file: '/tmp/meetup/.conan_two/extensions/plugins/compatibility/compatibility.py'
Initialized file: '/tmp/meetup/.conan_two/extensions/plugins/compatibility/app_compat.py'
Initialized file: '/tmp/meetup/.conan_two/extensions/plugins/compatibility/cppstd_compat.py'
Initialized file: '/tmp/meetup/.conan_two/extensions/plugins/profile.py'
Current Conan home: /tmp/meetup/.conan_two

[blackliner]

Amazing, thanks for this! This will make working in multiple repositories with different, conflicting hooks a dream. Also, monorepo ❤️