[#2785] [Extractor] Fix successful claimed extract leaving empty folder

* The main fix here is adding os.environ to the command call otherwise in some configurations
   the extraction would fail. Was unable to reproduce locally but users confirm this fix works.
 * Refactored the code to properly report errors if the extract command fails along with actual
   command output.
 * Bump version to 0.5.

deluge/plugins/Extractor/deluge/plugins/extractor/core.py

@@ -11,10 +11,11 @@
 # See LICENSE for more details.
 #
 
+import errno
 import logging
 import os
 
-from twisted.internet.utils import getProcessValue
+from twisted.internet.utils import getProcessOutputAndValue
 from twisted.python.procutils import which
 
 import deluge.component as component
@@ -120,40 +121,33 @@ class Core(CorePluginBase):
             if file_ext_sec and file_ext_sec + file_ext in EXTRACT_COMMANDS:
                 file_ext = file_ext_sec + file_ext
             elif file_ext not in EXTRACT_COMMANDS or file_ext_sec == '.tar':
-                log.warning("Can't extract file with unknown file type: %s", f["path"])
+                log.debug("Can't extract file with unknown file type: %s", f["path"])
                 continue
+
             cmd = EXTRACT_COMMANDS[file_ext]
-
-            # Now that we have the cmd, lets run it to extract the files
             fpath = os.path.join(tid_status["download_location"], os.path.normpath(f["path"]))
-
-            # Get the destination path
             dest = os.path.normpath(self.config["extract_path"])
             if self.config["use_name_folder"]:
-                name = tid_status["name"]
-                dest = os.path.join(dest, name)
+                dest = os.path.join(dest, tid_status["name"])
 
-            # Create the destination folder if it doesn't exist
-            if not os.path.exists(dest):
-                try:
-                    os.makedirs(dest)
-                except OSError as ex:
+            try:
+                os.makedirs(dest)
+            except OSError as ex:
+                if not (ex.errno == errno.EEXIST and os.path.isdir(dest)):
                     log.error("Error creating destination folder: %s", ex)
-                    return
+                    break
 
-            def on_extract_success(result, torrent_id, fpath):
-                # XXX: Emit an event
-                log.info("Extract successful: %s (%s)", fpath, torrent_id)
+            def on_extract(result, torrent_id, fpath):
+                # Check command exit code.
+                if not result[2]:
+                    log.info("Extract successful: %s (%s)", fpath, torrent_id)
+                else:
+                    log.error("Extract failed: %s (%s) %s", fpath, torrent_id, result[1])
 
-            def on_extract_failed(result, torrent_id, fpath):
-                # XXX: Emit an event
-                log.error("Extract failed: %s (%s)", fpath, torrent_id)
-
-            # Run the command and add some callbacks
-            log.debug("Extracting %s with %s %s to %s", fpath, cmd[0], cmd[1], dest)
-            d = getProcessValue(cmd[0], cmd[1].split() + [str(fpath)], {}, str(dest))
-            d.addCallback(on_extract_success, torrent_id, fpath)
-            d.addErrback(on_extract_failed, torrent_id, fpath)
+            # Run the command and add callback.
+            log.debug("Extracting %s from %s with %s %s to %s", fpath, torrent_id, cmd[0], cmd[1], dest)
+            d = getProcessOutputAndValue(cmd[0], cmd[1].split() + [str(fpath)], os.environ, str(dest))
+            d.addCallback(on_extract, torrent_id, fpath)
 
     @export
     def set_config(self, config):

deluge/plugins/Extractor/setup.py

@@ -16,7 +16,7 @@ from setuptools import find_packages, setup
 __plugin_name__ = "Extractor"
 __author__ = "Andrew Resch"
 __author_email__ = "andrewresch@gmail.com"
-__version__ = "0.3"
+__version__ = "0.5"
 __url__ = "http://deluge-torrent.org"
 __license__ = "GPLv3"
 __description__ = "Extract files upon torrent completion"