Customize the global cache location

The Package Manager maintains a global cache for registry data and uncompressed packages. The global cache includes subsidiary caches, each serving a different purpose. The Package Manager stores the global caches in a default location, which you can override.

You might want to override the cache location for several reasons:

You want to save space on your internal drive.
You want to store the cache on a shared drive, which is accessible to others.
You want to store the cache in a folder that’s not in a system directory.

By default, the Package Manager uses the following folder structure for the global cache:

<global-cache-root>
  ├── npm
  │   └── <registry data (package metadata and tarballs)>
  ├── packages
  │   └── <uncompressed contents of package tarballs>
  └── git-lfs (if enabled)
       └── <downloaded Git LFS files>

For information on the default location of the global cache root, see global cache.

Note: The Package Manager maintains separate caches for the global cache and the Asset Store package cache. For information on overriding the default location for the Asset Store cache, see Customize the Asset Store cache location.

To override the default location of the global cache root, you can use the following methods:

The Preferences window is the recommended method because of its ease and permanence. When you change the package cache location using this method, Unity stores the preference for the current session and future sessions.
- Note: Using the Preferences window sets the cacheRoot property in a user configuration file. If you want to set the configuration file manually, see Using a configuration file.
The environment variable method isn’t permanent, but advanced users might find it preferable in specific use cases.

Important notes before you begin

Regardless of the method you choose, changing the cache location tells the Package Manager to use that location going forward. Existing packages that Package Manager stored in the original location remain in that folder structure.
You can use environment variables to override the location of the global cache root or its subsidiary caches (registry data cache, uncompressed packages cache, and the Git LFS cache). However, environment variables and configuration file properties aren’t equivalent, so using different methods to configure settings can produce unexpected results.
There are several factors that affect how setting several values with different methods work together:
- If you used the environment variable method to change the cache location, then you can’t use the Preferences window to change the location.
- 当您使用用户配置文件时，更改将应用于当前用户帐户。
- 如果您使用 UPM_CACHE_ROOT 环境变量和 cacheRoot 属性为全局缓存根设置了不同的值，Package Manager 使用 UPM_CACHE_ROOT 环境变量中的位置。
- If you set an environment variable for the registry data cache (UPM_NPM_CACHE_PATH), the uncompressed packages cache (UPM_CACHE_PATH), or the Git LFS cache (UPM_GIT_LFS_CACHE_PATH), Package Manager uses the location specified by the environment variable, regardless of where the global cache root is.
- 如果您启用了 Git LFS 缓存 (UPM_ENABLE_GIT_LFS_CACHE)，但未显式制定其路径 (UPM_GIT_LFS_CACHE_PATH)，Package Manager 将使用全局缓存根下的 git-lfs 文件夹作为其位置。

Using the Preferences window

To use the Preferences window to override the default location of the global cache, follow these steps.

Use one of the following methods to open the Preferences window:
- Open the Unity menu (macOS) or the Edit menu (Windows and Linux) and select Preferences.
- Open the Package Manager window, open the Advanced menu, and select Preferences.
Select the Package Manager category.
Under Packages, open the menu beside Cache Location .
Choose Change Location.
Choose a new location for the global cache.

The Preferences window with the Package Manager category selected

Using a configuration file

You can manually edit the same configuration file that the Preferences window sets to override the location of the global cache root:

Locate the .upmconfig.toml user configuration file. To find the file location, see Configuration files. If the file doesn’t exist, create an empty text file.
Add the cacheRoot key and set its value as an absolute path to a custom location. Important: When setting Windows paths in TOML files, use forward slashes (/) or double backslashes (\\). Don’t use single backslashes (\) because they’re special characters which mark escape sequences and can cause TOML parsing errors.

Windows example
```
cacheRoot = "E:\\Unity\\cache"
```
macOS and Linux example
```
cacheRoot = "/dev/external/shared/Unity/cache"
```

You don’t need to restart the Unity Editor or the Hub after setting the cacheRoot key for the change to take effect.

Using environment variables

In scenarios that involve automation or continuous integration, it’s less practical and more error prone to configure settings in a configuration file or a preferences window. In such scenarios, you might consider using environment variables to configure settings for the global cache and its subsidiary caches. The following environment variables are available:

环境变量：	描述：
`UPM_CACHE_ROOT`	Specify the location of the global cache (the root folder containing the registry data and uncompressed packages caches).
`UPM_NPM_CACHE_PATH`	Specify the absolute path to the location where you want Package Manager to store package metadata and tarballs. By default, this is the `npm` subdirectory under the global cache root.
`UPM_CACHE_PATH`	Specify the absolute path to the location where you want Package Manager to store the uncompressed contents of package tarballs. By default, this is the `packages` subdirectory under the global cache root.
`UPM_ENABLE_GIT_LFS_CACHE`	Specify any value except empty ("") to enable the Git LFS cache. By default, Package Manager uses the `git-lfs` subdirectory under the global cache root, unless you specify a different path using the `UPM_GIT_LFS_CACHE_PATH` environment variable.
`UPM_GIT_LFS_CACHE_PATH`	指定您希望 Package Manager 存储 Git LFS 缓存的位置的绝对路径。通过设置此路径，您会自动启用 Git LFS 缓存。

Important: Follow these guidelines when you use this method:

Close the Unity Editor and Unity Hub if they’re already running before setting environment variables.
Launch the Unity Editor or Unity Hub from the same command prompt or terminal session where you set the environment variables.
Any environment variables you set in the table above must be set every time you launch Unity.

For information on setting environment variables, refer to the documentation for your operating system. For an introduction to environment variables, see https://en.wikipedia.org/wiki/Environment_variable.

Unity 2021.2 中的 Package Manager 配置文件现在支持设置全局缓存根 NewIn20212

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