Poetry: POETRY_CACHE_DIR or cache-dir config are not used at all.

[mdgilene]

• [x] I am on the latest Poetry version.
• [x] I have searched the issues of this repo and believe that this is not a duplicate.
• [x] If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Windows 10
• Poetry version: 1.0.5
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/mdgilene/0da1568f8ac90615e89cd1331115d80a

Issue

Setting the cache-dir location using either the environment variable POETRY_CACHE_DIR or with poetry config cache-dir /path/to/new/cache does not work. Poetry still uses the default location C:\Users\<user>\AppData\Local\pypoetry\Cache.

This will not work for me as there are size constraints on my user profile directory. Beacuse of this I need to relocate this directory to another drive.

I believe this to be cause by the fact that the environment/config settings are never read when determining the cache location.

poetry/utils/appdirs.py

def user_cache_dir(appname):
    r"""
    Return full path to the user-specific cache dir for this application.
        "appname" is the name of application.
    Typical user cache directories are:
        macOS:      ~/Library/Caches/<AppName>
        Unix:       ~/.cache/<AppName> (XDG default)
        Windows:    C:\Users\<username>\AppData\Local\<AppName>\Cache
    On Windows the only suggestion in the MSDN docs is that local settings go
    in the `CSIDL_LOCAL_APPDATA` directory. This is identical to the
    non-roaming app data dir (the default returned by `user_data_dir`). Apps
    typically put cache data somewhere *under* the given dir here. Some
    examples:
        ...\Mozilla\Firefox\Profiles\<ProfileName>\Cache
        ...\Acme\SuperApp\Cache\1.0
    OPINION: This function appends "Cache" to the `CSIDL_LOCAL_APPDATA` value.
    """
    if WINDOWS:
        # Get the base path
        path = os.path.normpath(_get_win_folder("CSIDL_LOCAL_APPDATA"))

        # Add our app name and Cache directory to it
        path = os.path.join(path, appname, "Cache")
    elif sys.platform == "darwin":
        # Get the base path
        path = expanduser("~/Library/Caches")

        # Add our app name to it
        path = os.path.join(path, appname)
    else:
        # Get the base path
        path = os.getenv("XDG_CACHE_HOME", expanduser("~/.cache"))

        # Add our app name to it
        path = os.path.join(path, appname)

    return path

[pwoolvett]

Far from ideal, but as a workaround you can temporarily set/replace XDG_CACHE_HOME, eg:

XDG_CACHE_HOME=/path/to/another/drive/cache poetry add black

(tested on 1.0.9)

[finswimmer]

Hello,

I tested it with the latest preview release without any problems. Is someone else able to reproduce the issue?

fin swimmer

[inseopark]

I've found something strange behavior on this topic.
Using poetry version 1.1.2, on Windows, I wanted run some script runnning with System privileges, I want to set cache-dir set other than Windows system directory.

When testing with normal user account,

• Without environment variable set :

C:\Users\ispark_skcc\AppData\Local\pypoetry\ used 
$ poetry shell
$ poetry add semver
...
$ gtree -dL 2 C:\Users\ispark_skcc\appdata\local\pypoetry\Cache
C:\Users\ispark_skcc\appdata\local\pypoetry\Cache
|-- artifacts
|   `-- d1
`-- cache
    `-- repositories

• With POETRY_CACHE_DIR set to other locations
  only artifacts directory goes into POETRY_CACHE_DIR, but cache\repositories\pypi generated in %LOCALAPPDATA%

$ gtree -dL 3 C:\Users\ispark_skcc\appdata\local\pypoetry\Cache
C:\Users\ispark_skcc\appdata\local\pypoetry\Cache
`-- cache
    `-- repositories
        `-- pypi