feat: add get_home_directory to repo_utils (#809)

docs/repo_utils.md

@@ -111,6 +111,24 @@ Find an environment variable in system. Doesn't %-escape the value!
 The environment variable value or the default if it is not set
 
 
+<a id="repo_utils.get_home_directory"></a>
+
+## repo_utils.get_home_directory
+
+<pre>
+repo_utils.get_home_directory(<a href="#repo_utils.get_home_directory-rctx">rctx</a>)
+</pre>
+
+
+
+**PARAMETERS**
+
+
+| Name  | Description | Default Value |
+| :------------- | :------------- | :------------- |
+| <a id="repo_utils.get_home_directory-rctx"></a>rctx |  <p align="center"> - </p>   |  none |
+
+
 <a id="repo_utils.os"></a>
 
 ## repo_utils.os

lib/private/repo_utils.bzl

@@ -55,6 +55,9 @@ def _get_env_var(rctx, name, default):
         return rctx.os.environ[name]
     return default
 
+def _get_home_directory(rctx):
+    return _get_env_var(rctx, "HOME", None)
+
 def _platform(rctx):
     """Returns a normalized name of the host os and CPU architecture.
 
@@ -109,6 +112,7 @@ repo_utils = struct(
     is_linux = _is_linux,
     is_windows = _is_windows,
     get_env_var = _get_env_var,
+    get_home_directory = _get_home_directory,
     os = _os,
     platform = _platform,
 )