NethVoice: support storing call recordings on external disk

[Amygos]

NethVoice currently does not support storing call recordings on an external disk. On NethServer 8, additional storage can be assigned to a module volume through the org.nethserver.volumes label.

Proposed approach

As a short-term solution, assign the entire spool volume to an external disk. This allows call recordings to be stored on external storage with minimal changes to the current architecture.

Scope

• implement the org.nethserver.volumes label in the module image
• assign the whole spool volume to the external disk
• allow this choice only during module installation

Limitations

This solution has some known constraints:

• spool is shared with other data in addition to call recordings
• the storage target can only be selected during module installation

These limitations should be documented as part of the feature.

Future improvements

Possible enhancements, not included in this implementation, include:

• allowing the storage destination to be changed after installation
• supporting only a subdirectory such as /var/spool/asterisk/monitor
• providing a UI option to configure recording storage more easily

References

• Mattermost discussion: https://mattermost.nethesis.it/nethesis/pl/844dqmhe7brs7rw117xh4xy91c
• NethServer 8 developer manual - Volumes: https://nethserver.github.io/ns8-core/modules/volumes/#suggest-volume-assignment-to-additional-disks