pyspaces 1.2.2

Create process in linux namespaces

Works with Linux namespaces througth glibc with pure python

Goals

There is so many beautiful tools like docker, rocket and vagga written on go and rust, but no one on python. I think that is because there is no easy way to works with linux namespaces on python:

• you can use asylum - project that looks like dead and with codebase hosted not on mainstream hub like github

• or you can use python-libvirt bindings with big layer of abstraction

• or just use native glibc library with ctypes

• otherwise subprocess.Popen your choice

I want to change it: i want to create native python bindings to glibc with interface of python multiprocessing.Process.

Example

First simple example:

import os
from pyspaces import Container


def execute(argv):
    os.execvp(argv[0], argv)

cmd = "mount -t proc proc /proc; ps ax"
c = Container(target=execute, args=(('bash', '-c', cmd),),
              uid_map='0 1000 1',
              newpid=True, newuser=True, newns=True
              )
c.start()
print("PID of child created by clone() is %ld\n" % c.pid)
c.join()
print("Child returned: pid %s, status %s" % (c.pid, c.exitcode))

output:

PID of child created by clone() is 15978

PID TTY      STAT   TIME COMMAND
1   pts/19   S+     0:00 bash -c mount -t proc proc /proc; ps ax
3   pts/19   R+     0:00 ps ax

Child returned: pid 15978, status 0

CLI

space -v execute --pid --fs --user --uid '0 1000 1' bash -c 'mount -t proc /proc; ps ax'

space chroot --pid --uid '0 1000 1' ~/.local/share/lxc/ubuntu/rootfs/ /bin/ls /home/

Note: If the program you’re trying to exec is dynamic linked, and the dynamic linker is not present in /lib in the chroot environment - you would get the “OSError: [Errno 2] No such file or directory” error. You’d need all the other files the dynamic-linked program depends on, including shared libraries and any essential configuration/table/etc in the new root directories. src