added ability to change configuration with yaml config file

.travis.yml

@@ -9,7 +9,7 @@ python:
 
 # Install Dependencies
 install:
-    - pip install nose coveralls
+    - pip install nose coveralls PyYAML
 
 # Run Tests
 script:

README.md

@@ -51,7 +51,14 @@ n021 | 2016-11-26 19:00:01 | offline,down | 'DIMM Configuration Error'
 -- --
 ```
 
-Use --help to show all options.
+You can setup the configuration file for tracknodes to change the database location or the command to get node status.  Use the below as an example.
+
+```shell
+$ cat /etc/tracknodes.conf
+---
+dbfile: "/opt/tracknodes.db"
+pbsnodes_cmd: "/opt/pbsnodes"
+```
 
 ```shell
 $ tracknodes --help

lib/tracknodes/cli.py

@@ -1,5 +1,7 @@
 """ Command Line Interface Module """
 import optparse
+import os
+import yaml
 from tracknodes import TrackNodes
 
 
@@ -21,7 +23,7 @@ def __init__(self):
         parser.add_option("-c", "--pbsnodes_cmd", dest="pbsnodes_cmd",
                           help="pbsnodes binary location, example: /opt/pbsnodes",
                           metavar="PBSNODESCMD",
-                          default="pbsnodes")
+                          default=None)
         parser.add_option("-v", "--verbose", dest="verbose",
                           help="Verbose Output",
                           metavar="VERBOSE",
@@ -33,6 +35,18 @@ def __init__(self):
         self.dbfile = options.dbfile
         self.verbose = options.verbose
 
+        # Load Configurations if not set on CLI
+        if os.path.isfile('/etc/tracknodes.conf'):
+            with open('/etc/tracknodes.conf', 'r') as f:
+                tracknodes_conf = yaml.load(f)
+                if tracknodes_conf is not None:
+                    if "dbfile" in tracknodes_conf:
+                        if self.dbfile is None:
+                            self.dbfile = str(tracknodes_conf["dbfile"])
+                    if "pbsnodes_cmd" in tracknodes_conf:
+                        if self.pbsnodes_cmd is None:
+                            self.pbsnodes_cmd = str(tracknodes_conf["pbsnodes_cmd"])
+
     def run(self):
         """ EntryPoint Of Application """
         pbsnodes = TrackNodes(update=self.update, dbfile=self.dbfile, pbsnodes_cmd=self.pbsnodes_cmd, verbose=self.verbose)

lib/tracknodes/tracknodes.py

@@ -118,6 +118,9 @@ def is_exe(fpath):
             """ File must have execute bit set """
             return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
 
+        if program is None:
+            return None
+
         fpath, fname = os.path.split(program)
         if fpath:
             if is_exe(program):

setup.py

@@ -22,7 +22,7 @@
     author_email='[email protected]',
     url='https://github.com/NREL/tracknodes',
     license='GPL',
-    install_requires=[],
+    install_requires=["PyYAML"],
     package_dir={
         '': 'lib'},
     packages=find_packages('lib'),