Wrapper Script

Ever run some commands that take a very long time to run, such as compiling code? Yet you never notice that the command stopped running. I solved this problem by creating a Python script, called wrapper.py, that runs a single command and then emails the result to the executor of the script.

Here is the script’s usage:

$ wrapper.py [COMMAND_WITH_ARGUMENTS]

For example, here is how I now compile code.

$ wrapper.py make all

You can download this Python script here, or you can copy-n-paste from down below.

#!/usr/bin/python
 
 ###############################################################################################
 # This script was written for www.philforhumanity.com.
 # If you have any questions, issues, or enhancement requests, please contact us via the website.
 # Use this script at your own risk.
 ###############################################################################################
 
 # This script will run any command, then email the user the command finished running.
 
 # System Libraries
 from subprocess import call    # For the call function
 from sys import argv           # For arguments
 from getpass import getuser    # For userid (not importing all of getpass)
 
 # Variables
 command = argv[1:]             # Ignore the first argument, since that is this script's file name, for the command to run   # sys.argv
 commandstr = ' '.join(command) # Convert the list into a string separated by a single space
 delimiter = '=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-='
 return_code = 0
 username = getuser() + "@philforhumanity.com"
 
 # Check to make sure at least one argument is given
 if (len(argv) < 2):   # sys.argv
     print "\nERROR: No commands given.\n\nUSAGE:", sys.argv[0], "[COMMAND_WITH_ARGUMENTS]"
     exit (1)
 
 # Run command
 print "Running command:", commandstr, "\n", delimiter
 try:
     return_code = call(commandstr, shell=True)           # NOTE: This will print the output to the screen
     if (return_code <> 0):
         print delimiter, "\nERROR: Command failed with return code:", return_code
         command2 = 'echo Command failed: ' + commandstr + '| /usr/bin/mail -s "Command failed: ' + commandstr + '" ' + username
     else:
         print delimiter, "\nCommand passed: " + commandstr
         command2 = 'echo Command passed: ' + commandstr + '| /usr/bin/mail -s "Command passed: ' + commandstr + '" ' + username
 except OSError as e:
     print >>sys.stderr, "ERROR: Execution failed:", e
     exit (1)
 
 # Send email
 print delimiter, "\nSending email with this command:", command2
 try:
     return_code = call(command2, shell=True)           # NOTE: This will print the output to the screen
     if (return_code <> 0):
         print "ERROR #2: Email failed with return code:", return_code
 except OSError as e:
     print >>sys.stderr, "ERROR #2: Execution failed:", e
     exit (1)
 
 # Exit
 exit ()

by Phil for Humanity
on 10/02/2014

Wrapper Script

Related Articles » UNIX Support: Recursively GREP » Recursive GREP » Command Loop

Related Articles
» UNIX Support: Recursively GREP
» Recursive GREP
» Command Loop