root/autopilot/trunk/autopilot/delete_glider.py

"""
Delete glider from configuration file.

    Usage:

        delete-glider glider

    or

        python delete_glider.py path/to/config/file glider
"""

import os
import sys
import errno
import lockfile as lf
import ConfigParser as cp

if __name__ == "__main__":
    num_args = len(sys.argv) - 1
    if num_args != 2:
        print __doc__
    else:
        cfg_path = os.path.abspath(sys.argv[1])
        glider = sys.argv[2].lower()
        report = {"glider": glider,
                  "path": cfg_path,
                 }
        try:
            lock = lf.FileLock(cfg_path)
            lock.acquire(5)
        except lf.LockTimeout:
            lock.break_lock()
            lock.acquire(0)
        config = cp.SafeConfigParser()
        try:
            with open(cfg_path) as handle:
                config.readfp(handle)
        except IOError as e:
            if e.errno == errno.ENOENT:
                print "Glider {glider} does not exist in {path}.". \
                      format(**report)
        else:
            if config.remove_section(glider):
                with open(cfg_path, "w") as handle:
                    config.write(handle)
                print "Glider {glider} deleted from {path}.". \
                      format(**report)
            else:
                print "Glider {glider} does not exist in {path}.". \
                      format(**report)
        finally:
            lock.release()