Synnefo » ./kamaki

Metadata and Property modification

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Image metadata and custom properties can be modified even after the image is

registered. Metadata are fixed image attributes, like name, disk format etc.

while custom properties are set by the image owner and, usually, refer to

attributes of the images OS.

Let's rename the image:

.. code-block:: console

    [kamaki]: image meta set 7h1rd-1m4g3-1d --name='Changed Name'

    [kamaki]:

If we, now, list the image metadata, we will see that the name is changed:

.. code-block:: console

    [kamaki]: image meta list 7h1rd-1m4g3-1d

    checksum:         3cb03556ec971f...e8dd6190443b560cb7

    container-format: bare

    created-at:       2013-06-19 08:00:22

    deleted-at:       

    disk-format:      diskdump

    id:               7h1rd-1m4g3-1d

    is-public:        False

    location:         pithos://s0m3-u53r-1d/pithos/debian_base3.diskdump

    name:             Changed Name

    owner:            s0m3-u53r-1d

    properties:      

            OS:     Linux

            USER:   root

    size:             903471104

    status:           available

    updated-at:       2013-06-19 08:01:00

    [kamaki]:

We can use the same idea to change the values of other metadata like disk

format, container format or status. On the other hand, we cannot modify the

id, owner, location, checksum and dates. E.g., to publish and unpublish:

.. code-block:: console

    [kamaki]: image meta set 7h1rd-1m4g3-1d --publish --name='Debian Base Gama'

    [kamaki]: image meta set 7h1rd-1m4g3-1d --unpublish

    [kamaki]:

The first call published the image (set is-public to True) and also restored

the name to "Debian Base Gama". The second one unpublished the image (set

is-public to False).

To delete metadata, use the image meta delete method:

.. code-block:: console

    [kamaki]: image meta delete 7h1rd-1m4g3-1d status

    [kamaki]:

will empty the value of "status".

These operations can be used for properties with the same semantics:

.. code-block:: console

    [kamaki]: image meta set 7h1rd-1m4g3-1d -p user=user

    [kamaki]: image meta list 7h1rd-1m4g3-1d

    ...

    properties:

            OS:     Linux

            USER:   user

    ...

    [kamaki]:

Just to test the feature, let's create a property "greet" with value

"hi there", and then remove it. Also, let's restore the value of USER:

.. code-block:: console

    [kamaki]: image meta set 7h1rd-1m4g3-1d -p greet='Hi there' -p user=root

    [kamaki]: image meta list 7h1rd-1m4g3-1d

    ...

    properties:

            OS:     Linux

            USER:   root

            GREET:  Hi there

    ...

    [kamaki]: image meta delete 7h1rd-1m4g3-1d -p greet

    [kamaki]: image meta list 7h1rd-1m4g3-1d

    ...

    properties:

            OS:     Linux

            USER:   root

    ...

    [kamaki]: