Merge pull request #1362 from c0rydoras/fix/cache-dir

Follow XDG Base Directory Specification for cache directory

doc/source/symbol-tables.rst

@@ -9,7 +9,7 @@ How Volatility finds symbol tables
 
 All files are stored as JSON data, they can be in pure JSON files as ``.json``, or compressed as ``.json.gz`` or ``.json.xz``.
 Volatility will automatically decompress them on use.  It will also cache their contents (compressed) when used, located
-under the user's home directory, in :file:`.cache/volatility3`, along with other useful data.  The cache directory currently
+under the user's home directory, in :file:`.cache/volatility3` or when `XDG_CACHE_HOME` is set in :file:`${XDG_CACHE_HOME}/volatility3`, along with other useful data.  The cache directory currently
 cannot be altered.
 
 Symbol table JSON files live, by default, under the :file:`volatility3/symbols` directory.  The symbols directory is

volatility3/framework/constants/__init__.py

@@ -6,6 +6,7 @@
 Stores all the constant values that are generally fixed throughout
 volatility This includes default scanning block sizes, etc.
 """
+
 import enum
 import os.path
 import sys
@@ -65,7 +66,11 @@ LOGLEVEL_VVV = 7
 LOGLEVEL_VVVV = 6
 """Logging level for four levels of detail: -vvvvvv"""
 
-CACHE_PATH = os.path.join(os.path.expanduser("~"), ".cache", "volatility3")
+
+CACHE_PATH = os.path.join(
+    os.environ.get("XDG_CACHE_HOME") or os.path.join(os.path.expanduser("~"), ".cache"),
+    "volatility3",
+)
 """Default path to store cached data"""
 
 SQLITE_CACHE_PERIOD = "-3 days"