From ff0048a3a26c9076c8052a8c7be171e4364f0d09 Mon Sep 17 00:00:00 2001
From: "Chris St. Pierre" <chris.a.st.pierre@gmail.com>
Date: Thu, 7 Feb 2013 10:00:37 -0500
Subject: moved common file locking code into Bcfg2.Utils

---
 src/lib/Bcfg2/Client/Client.py           | 10 ++++------
 src/lib/Bcfg2/Server/Plugins/Metadata.py | 12 ++----------
 src/lib/Bcfg2/Utils.py                   | 10 ++++++++++
 3 files changed, 16 insertions(+), 16 deletions(-)

(limited to 'src/lib')

diff --git a/src/lib/Bcfg2/Client/Client.py b/src/lib/Bcfg2/Client/Client.py
index 45e0b64e6..b0d877a19 100644
--- a/src/lib/Bcfg2/Client/Client.py
+++ b/src/lib/Bcfg2/Client/Client.py
@@ -14,6 +14,7 @@ import Bcfg2.Options
 import Bcfg2.Client.XML
 import Bcfg2.Client.Frame
 import Bcfg2.Client.Tools
+from Bcfg2.Utils import locked
 from Bcfg2.Compat import xmlrpclib
 from Bcfg2.version import __version__
 from subprocess import Popen, PIPE
@@ -288,11 +289,7 @@ class Client(object):
             #check lock here
             try:
                 lockfile = open(self.setup['lockfile'], 'w')
-                try:
-                    fcntl.lockf(lockfile.fileno(),
-                                fcntl.LOCK_EX | fcntl.LOCK_NB)
-                except IOError:
-                    # otherwise exit and give a warning to the user
+                if locked(lockfile.fileno()):
                     self.fatal_error("Another instance of Bcfg2 is running. "
                                      "If you want to bypass the check, run "
                                      "with the %s option" %
@@ -301,7 +298,8 @@ class Client(object):
                 raise
             except:
                 lockfile = None
-                self.logger.error("Failed to open lockfile")
+                self.logger.error("Failed to open lockfile %s: %s" %
+                                  (self.setup['lockfile'], sys.exc_info()[1]))
 
         # execute the configuration
         self.tools.Execute()
diff --git a/src/lib/Bcfg2/Server/Plugins/Metadata.py b/src/lib/Bcfg2/Server/Plugins/Metadata.py
index ef0c152fd..df98e6ea8 100644
--- a/src/lib/Bcfg2/Server/Plugins/Metadata.py
+++ b/src/lib/Bcfg2/Server/Plugins/Metadata.py
@@ -15,6 +15,7 @@ import Bcfg2.Server
 import Bcfg2.Server.Lint
 import Bcfg2.Server.Plugin
 import Bcfg2.Server.FileMonitor
+from Bcfg2.Utils import locked
 from Bcfg2.Compat import MutableMapping, all, wraps  # pylint: disable=W0622
 from Bcfg2.version import Bcfg2VersionInfo
 
@@ -27,15 +28,6 @@ except ImportError:
 LOGGER = logging.getLogger(__name__)
 
 
-def locked(fd):
-    """ Acquire a lock on a file """
-    try:
-        fcntl.lockf(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
-    except IOError:
-        return True
-    return False
-
-
 if HAS_DJANGO:
     class MetadataClientModel(models.Model,
                               Bcfg2.Server.Plugin.PluginDatabaseModel):
@@ -195,7 +187,7 @@ class XMLMetadataConfig(Bcfg2.Server.Plugin.XMLFileBacked):
         newcontents = lxml.etree.tostring(dataroot, xml_declaration=False,
                                           pretty_print=True).decode('UTF-8')
 
-        while locked(fd) == True:
+        while locked(fd):
             pass
         try:
             datafile.write(newcontents)
diff --git a/src/lib/Bcfg2/Utils.py b/src/lib/Bcfg2/Utils.py
index ba17e1a63..247e4f16b 100644
--- a/src/lib/Bcfg2/Utils.py
+++ b/src/lib/Bcfg2/Utils.py
@@ -2,6 +2,7 @@
 used by both client and server.  Stuff that doesn't fit anywhere
 else. """
 
+import fcntl
 from Bcfg2.Compat import any  # pylint: disable=W0622
 
 
@@ -65,3 +66,12 @@ class PackedDigitRange(object):
 
     def __len__(self):
         return sum(r[1] - r[0] + 1 for r in self.ranges) + len(self.ints)
+
+
+def locked(fd):
+    """ Acquire a lock on a file """
+    try:
+        fcntl.lockf(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
+    except IOError:
+        return True
+    return False
-- 
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