fixing bug related to the new security features in Git. Some requests to versions were made as root

    return res

def revision_update(path,file):

    import subprocess

    import subprocess, os# , pwd for some reasons  pwd.getpwall() show some 3-user default, so read and parse etc/passwd

    pef = None # , preexec_fn=pefuid

    if (os.getuid() == 0):

        uname = os.getlogin()

        with open("/etc/passwd") as f:

            for line in f:

                line = line.strip()

                a = line.split(':')

                if a[0] == uname:

                    pef = preexec_fn=demote(int(a[3]),int(a[2]));    

                    break

    cmd = "cd "+path+"; git rev-list --count $(git log -1 --pretty=format:\"%H\" "+file+")..HEAD"

    try:

        res = subprocess.check_output(cmd,stderr=subprocess.STDOUT,shell=True)

        res = subprocess.check_output(cmd,stderr=subprocess.STDOUT,shell=True, preexec_fn=pef)

    except subprocess.CalledProcessError as e:

        res = "error_"+e.returncode

    res = str(int(res))

    res = res.strip(' \t\n\r')

    return res

def demote(user_uid, user_gid):

    import os

    def result():

        os.setgid(user_gid)

        os.setuid(user_uid)

    return result