Auto detect JAVA_HOME on Linux (#546)

* Auto detect JAVA_HOME for linux

* Fix is_linux and import subprocess

* Revert "Fix is_linux and import subprocess"

This reverts commit 3ff9f89.

* Revert "Auto detect JAVA_HOME for linux"

This reverts commit 1b31fd8.

* Restore original source and update JAVA_PATH on linux

* Add makefile

* Pythonic way to set JAVA_HOME on Linux

* Ignore the Makefile

commands/java.py

@@ -10,9 +10,10 @@
 import traceback
 import sys
 import logging
+from pathlib import Path
 
 from commands.util import configure_error
-from commands.util import is_osx
+from commands.util import is_osx, is_linux
 from commands.util import shell
 from commands.util import CommandFailed
 from commands.util import warning
@@ -48,6 +49,12 @@ def get_java_home():
         except CommandFailed:
             traceback.print_exc()
 
+    if is_linux():
+        javac_path = shutil.which('javac')
+        if javac_path is not None:
+            _java_home = Path(javac_path).resolve().parent.parent.as_posix()
+            return _java_home
+
     configure_error(
         'Please set the environment variable JAVA_HOME to a path containing the JDK.')
 

commands/util.py

@@ -26,6 +26,10 @@ def is_bsd():
     return 'bsd' in get_platform()
 
 
+def is_linux():
+    return "linux" in get_platform()
+
+
 class CommandFailed(Exception):
     """
     The command failed to run for any reason