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File name : qemu_img.py

Content :

"""
Qemu-img Command Wrapper
========================

The qemu img command is wrapped for specific functions

:depends: qemu-img
"""

import os

import salt.utils.path

def __virtual__():
    """
    Only load if qemu-img is installed
    """
    if salt.utils.path.which("qemu-img"):
        return "qemu_img"
    return (
        False,
        "The qemu_img execution module cannot be loaded: the qemu-img binary is not in"
        " the path.",
    )

def make_image(location, size, fmt):
    """
    Create a blank virtual machine image file of the specified size in
    megabytes. The image can be created in any format supported by qemu

CLI Example:

.. code-block:: bash

salt '*' qemu_img.make_image /tmp/image.qcow 2048 qcow2
        salt '*' qemu_img.make_image /tmp/image.raw 10240 raw
    """
    if not os.path.isabs(location):
        return ""
    if not os.path.isdir(os.path.dirname(location)):
        return ""
    if not __salt__["cmd.retcode"](
        "qemu-img create -f {} {} {}M".format(fmt, location, size),
        python_shell=False,
    ):
        return location
    return ""

def convert(orig, dest, fmt):
    """
    Convert an existing disk image to another format using qemu-img

CLI Example:

.. code-block:: bash

salt '*' qemu_img.convert /path/to/original.img /path/to/new.img qcow2
    """
    cmd = ("qemu-img", "convert", "-O", fmt, orig, dest)
    ret = __salt__["cmd.run_all"](cmd, python_shell=False)
    if ret["retcode"] == 0:
        return True
    else:
        return ret["stderr"]

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