Revert "fix setting preference rollback error"

This reverts commit 963e4e9.

scripts/targetcli

@@ -23,7 +23,7 @@ from __future__ import print_function
 from os import getuid, getenv
 from targetcli import UIRoot
 from rtslib_fb import RTSLibError
-from configshell_fb import Console, ConfigShell, ExecutionError
+from configshell_fb import ConfigShell, ExecutionError
 from targetcli import __version__ as targetcli_version
 
 import sys
@@ -88,27 +88,30 @@ def usage_version(cmd):
     if cmd in ("version", "--version", "-v"):
         version()
 
-def try_op_lock(console, lkfd):
+def try_op_lock(shell, lkfd):
     '''
     acquire a blocking lock on lockfile, to serialize multiple requests
     '''
     try:
         fcntl.flock(lkfd, fcntl.LOCK_EX)  # wait here until ongoing request is finished
     except Exception as e:
-        text = "taking lock on lockfile failed: %s" %str(e)
-        console.display(console.render_text(text, 'red'))
+        shell.con.display(
+            shell.con.render_text(
+                "taking lock on lockfile failed: %s" %str(e),
+                'red'))
         sys.exit(1)
 
-def release_op_lock(console, lkfd):
+def release_op_lock(shell, lkfd):
     '''
     release blocking lock on lockfile, which can allow other requests process
     '''
     try:
         fcntl.flock(lkfd, fcntl.LOCK_UN)  # allow other requests now
     except Exception as e:
-        text = "unlock on lockfile failed: %s" %str(e)
-        console.display(console.render_text(text, 'red'))
-        lkfd.close()
+        shell.con.display(
+            shell.con.render_text(
+                "unlock on lockfile failed: %s" %str(e),
+                'red'))
         sys.exit(1)
     lkfd.close()
 
@@ -248,23 +251,21 @@ def main():
     '''
     Start the targetcli shell.
     '''
-    console = Console()
+    shell = TargetCLI(getenv("TARGETCLI_HOME", '~/.targetcli'))
 
     is_root = False
     if getuid() == 0:
         is_root = True
 
     try:
-        lkfd = open(lock_file, 'w+')
+        lkfd = open(lock_file, 'w+');
     except IOError as e:
-        text = "opening lockfile failed: %s" %str(e)
-        console.display(console.render_text(text, 'red'))
+        shell.con.display(
+                shell.con.render_text("opening lockfile failed: %s" %str(e),
+                    'red'))
         sys.exit(1)
 
-    try_op_lock(console, lkfd)
-
-    targetcli_dir = getenv("TARGETCLI_HOME", '~/.targetcli')
-    shell = TargetCLI(targetcli_dir, console)
+    try_op_lock(shell, lkfd)
 
     use_daemon = False
     if shell.prefs['auto_use_daemon']:
@@ -291,7 +292,6 @@ def main():
         shell.con.display(shell.con.render_text(str(error), 'red'))
         if not is_root:
             shell.con.display(shell.con.render_text("Retry as root.", 'red'))
-        release_op_lock(console, lkfd)
         sys.exit(-1)
 
     if len(sys.argv) > 1:
@@ -302,9 +302,7 @@ def main():
                 shell.run_cmdline(" ".join(sys.argv[1:]))
         except Exception as e:
             print(str(e), file=sys.stderr)
-            release_op_lock(console, lkfd)
             sys.exit(1)
-        release_op_lock(console, lkfd)
         sys.exit(0)
 
     shell.con.display("targetcli shell version %s\n"
@@ -324,7 +322,7 @@ def main():
         shell.log.info("Global pref auto_save_on_exit=true")
         root_node.ui_command_saveconfig()
 
-    release_op_lock(console, lkfd)
+    release_op_lock(shell, lkfd)
 
 
 if __name__ == "__main__":