import os
import tempfile, random


def mount(src, dst, shared, private, slave):
    cmd = "mount"
    if shared:
        cmd += " --make-shared"
    if private:
        cmd += " --make-private"
    if slave:
        cmd += " --make-slave"
    if src:
        cmd += " --bind '%s' '%s'" % (src, dst)
    else:
        cmd += " -t tmpfs none '%s'" % (dst)

    print(cmd)
    ret = os.system(cmd)
    if ret:
        print("failed")


root = tempfile.mkdtemp(prefix="root.mount", dir="/tmp")
mount(None, root, 1, 0, 0)
mounts = [root]

for i in range(10):
    dstdir = random.choice(mounts)
    dst = tempfile.mkdtemp(prefix="mount", dir=dstdir)
    src = random.choice(mounts + [None])
    mount(src, dst,
          random.randint(0, 100) > 50,
          random.randint(0, 100) > 90,
          random.randint(0, 100) > 50)
    mounts.append(dst)