scripts: Add a check that scripts are run from an installation direct…

…ory.

This helps to assist our users when they try to run the scripts from the
'retdec/scripts' directory instead of from an installed RetDec (#418).

scripts/retdec-decompiler.py

@@ -17,6 +17,7 @@
 retdec_unpacker = importlib.import_module('retdec-unpacker')
 utils = importlib.import_module('retdec-utils')
 utils.check_python_version()
+utils.ensure_script_is_being_run_from_installed_retdec()
 
 SigFromLib = retdec_signature_from_library_creator.SigFromLib
 Unpacker = retdec_unpacker.Unpacker

scripts/retdec-fileinfo.py

@@ -15,6 +15,7 @@
 config = importlib.import_module('retdec-config')
 utils = importlib.import_module('retdec-utils')
 utils.check_python_version()
+utils.ensure_script_is_being_run_from_installed_retdec()
 retdec_archive_decompiler = importlib.import_module('retdec-archive-decompiler')
 
 ArchiveDecompiler = retdec_archive_decompiler.ArchiveDecompiler

scripts/retdec-signature-from-library-creator.py

@@ -15,6 +15,7 @@
 config = importlib.import_module('retdec-config')
 utils = importlib.import_module('retdec-utils')
 utils.check_python_version()
+utils.ensure_script_is_being_run_from_installed_retdec()
 
 CmdRunner = utils.CmdRunner
 sys.stdout = utils.Unbuffered(sys.stdout)

scripts/retdec-tests-runner.py

@@ -11,6 +11,7 @@
 import importlib
 utils = importlib.import_module('retdec-utils')
 utils.check_python_version()
+utils.ensure_script_is_being_run_from_installed_retdec()
 
 try:
     import colorama

scripts/retdec-unpacker.py

@@ -28,6 +28,7 @@
 config = importlib.import_module('retdec-config')
 utils = importlib.import_module('retdec-utils')
 utils.check_python_version()
+utils.ensure_script_is_being_run_from_installed_retdec()
 
 CmdRunner = utils.CmdRunner
 sys.stdout = utils.Unbuffered(sys.stdout)

scripts/retdec-utils.py

@@ -282,6 +282,17 @@ def check_python_version():
     if sys.version_info < (3,4):
         print_error_and_die('Cannot use Python version {} ({}). Use at least Python 3.4.'.format(platform.python_version(), sys.executable))
 
+def ensure_script_is_being_run_from_installed_retdec():
+    # Use this function to assist our users when they try to run the scripts
+    # from the 'retdec/scripts' directory instead of from an installed RetDec.
+    # See https://github.com/avast-tl/retdec/issues/418
+    if not os.path.dirname(__file__).endswith('bin'):
+        print_error_and_die(
+            'You need to build and install RetDec first and then run the installed script via '
+            '`python $RETDEC_INSTALL_DIR/bin/retdec-decompiler.py`.\n'
+            'For more details, see https://github.com/avast-tl/retdec#installation-and-use'
+        )
+
 def tool_exists(tool_name):
     return shutil.which(tool_name) is not None