Fix error unclosed IO on external binary version query

cps/converter.py

@@ -39,9 +39,7 @@ def _get_command_version(path, pattern, argument=None):
         if argument:
             command.append(argument)
         try:
-            for line in process_wait(command):
-                if re.search(pattern, line):
-                    return line
+            return process_wait(command, pattern=pattern).string
         except Exception as ex:
             log.warning("%s: %s", path, ex)
             return _EXECUTION_ERROR

cps/helper.py

@@ -711,12 +711,11 @@ def check_unrar(unrarLocation):
         if sys.version_info < (3, 0):
             unrarLocation = unrarLocation.encode(sys.getfilesystemencoding())
         unrarLocation = [unrarLocation]
-        for lines in process_wait(unrarLocation):
-            value = re.search('UNRAR (.*) freeware', lines, re.IGNORECASE)
-            if value:
-                version = value.group(1)
-                log.debug("unrar version %s", version)
-                break
+        value = process_wait(unrarLocation, pattern='UNRAR (.*) freeware')
+        if value:
+            version = value.group(1)
+            log.debug("unrar version %s", version)
+
     except (OSError, UnicodeDecodeError) as err:
         log.debug_or_exception(err)
         return _('Error excecuting UnRar')

cps/subproc_wrapper.py

@@ -20,7 +20,7 @@ from __future__ import division, print_function, unicode_literals
 import sys
 import os
 import subprocess
-
+import re
 
 def process_open(command, quotes=(), env=None, sout=subprocess.PIPE, serr=subprocess.PIPE, newlines=True):
     # Linux py2.7 encode as list without quotes no empty element for parameters
@@ -44,12 +44,18 @@ def process_open(command, quotes=(), env=None, sout=subprocess.PIPE, serr=subpro
     return subprocess.Popen(exc_command, shell=False, stdout=sout, stderr=serr, universal_newlines=newlines, env=env) # nosec
 
 
-def process_wait(command, serr=subprocess.PIPE):
+def process_wait(command, serr=subprocess.PIPE, pattern=""):
     # Run command, wait for process to terminate, and return an iterator over lines of its output.
     newlines = os.name != 'nt'
+    ret_val = ""
     p = process_open(command, serr=serr, newlines=newlines)
     p.wait()
     for line in p.stdout.readlines():
         if isinstance(line, bytes):
             line = line.decode('utf-8')
-        yield line
+        match = re.search(pattern, line, re.IGNORECASE)
+        if match and ret_val == "":
+            ret_val = match
+    p.stdout.close()
+    p.stderr.close()
+    return ret_val