Monitors executables in a directory (passed as argument). Executables that are modified (based on md5sum) or introduced, are executed.

autodirexec.py

#!/usr/bin/env python

import sys, os, commands, time, errno

def getExecutablesAndMd5(directory):
    """
    Returns a dictionary with the following.
    Key: Paths to executable within specified directory.
    Value: The md5sums of the executable.
    """
    execs = {}
    for d in os.listdir(directory):
        filePath = os.path.join(directory,d)
        if (os.path.isfile(filePath) and os.access(filePath, os.X_OK)):
            execs[filePath] = commands.getoutput('md5sum ' + filePath)
    return execs

def sanityCheck():
    if len(sys.argv) < 2:
        print 'Not enough arguments. Specify directory to monitor.'
        exit(errno.EINVAL)

    monitorDir = str(sys.argv[1])
    if not os.path.isdir(monitorDir):
        print 'Directory "' + monitorDir + '" doesn\'t exist!'
        exit(errno.ENOTDIR)

def main():
    """
    Monitors executables in a directory (passed as argument).
    Executables that are modified (based on md5sum) or introduced,
    are executed.

    External requirements: md5sum
    """
    sanityCheck()

    os.system('clear')
    print 'Waiting for executables.'

    monitorDir = str(sys.argv[1])
    execs = getExecutablesAndMd5(monitorDir)
    loopsSinceClear = 0
    while (True):
        execsNow = getExecutablesAndMd5(monitorDir)

        # Loop through to see if tests should be run.
        areThereTestsToRun = False
        for k in execsNow:
            isNew = not execs.has_key(k)
            isUpdated = execs.has_key(k) and execsNow[k] != execs[k]
            if isNew or isUpdated:
                areThereTestsToRun = True
                break

        if (areThereTestsToRun):
            # Only clear screen if >6 iterations have passed by
            # without tests being modified.
            if loopsSinceClear > 6:
                os.system('clear')
                loopsSinceClear = 0

            # Execute tests that are new or updated.
            for k in execsNow:
                isNew = not execs.has_key(k)
                isUpdated = execs.has_key(k) and execsNow[k] != execs[k]
                if isNew or isUpdated:
                    print commands.getoutput(k)
        else:
            loopsSinceClear += 1

        execs = execsNow
        time.sleep(0.5);

if __name__ == "__main__":
    main()