vishesh92 opened a new pull request, #7949:
URL: https://github.com/apache/cloudstack/pull/7949

   Docs PR - https://github.com/apache/cloudstack-documentation/pull/352
   
   ### Description
   
   This PR allows listing files in a primary storage (for KVM, VMWare & 
XenServer hypervisors) and secondary storage (via SSVM). We also link the 
templates, snapshots and volumes with the files in the UI.
   This will also help to list files which are not in cloudstack db but left 
over due to some failed action.
   
   <!--- Describe your changes in DETAIL - And how has behaviour functionally 
changed. -->
   #### Implementation Overview
   We send a command to endpoint for a datastore (SSVM for secondary storage 
and Hypervisor manager or hosts) to list files at a path. Using the answer, we 
link tempate id, snapshot id and volume id by querying the database and send 
the response.
   
   #### Commands Added
   * **Command** - `listImageStoreObjects`
   * params
     * `id` - id of the image store
     * `path` - path to list on image store
   * **Command** - `listStoragePoolObjects`
   * **params**
     * `id` - id of the storage pool
     * `path` - path to list on storage pool
   * **Command** - `migrateResourceToAnotherSecondaryStorage`
   * params
     * `srcpool` - id of the image store from where the data is to be migrated
     * `destpool` - id of the destination secondary storage pool to which the 
resources are to be migrated
     * `templates` - id(s) of the templates to be migrated
     * `snapshots` - id(s) of the snapshots to be migrated
   
   #### Response for `listImageStoreObjects` and `listStoragePoolObjects`
   List response containing the following keys:
   * `name` - Name of the data store object
   * `isdirectory` - Is it a directory
   * `size` - Size is in Bytes
   * `templateid` - Template ID associated with the data store object
   * `format` - Format of template associated with the data store object
   * `snapshotid` - Snapshot ID associated with the data store object
   * `volumeid` - Volume ID associated with the data store object
   * `lastupdated` - Last modified date of the file/directory
   
   
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   <!-- In case of bug fix, the expected and actual behaviours, steps to 
reproduce. -->
   
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   ### Types of changes
   
   - [ ] Breaking change (fix or feature that would cause existing 
functionality to change)
   - [x] New feature (non-breaking change which adds functionality)
   - [ ] Bug fix (non-breaking change which fixes an issue)
   - [ ] Enhancement (improves an existing feature and functionality)
   - [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
   
   ### Feature/Enhancement Scale or Bug Severity
   
   #### Feature/Enhancement Scale
   
   - [x] Major
   - [ ] Minor
   
   #### Bug Severity
   
   - [ ] BLOCKER
   - [ ] Critical
   - [ ] Major
   - [ ] Minor
   - [ ] Trivial
   
   
   ### Screenshots (if appropriate):
   
   
   ### How Has This Been Tested?
   <!-- Please describe in detail how you tested your changes. -->
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   <!-- Please read the 
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