Commits on Apr 30, 2024

1. azureblob: allow working with only list+create/write permissions (fix… …

   … no_head_object/add no_read_for_metadata)
   
   There are three reasons an option why one would avoid HEAD requests on azureblob, with this now mainly implementing the latter one:
   
   - no_head_object: Don't do a HEAD *before* writing to (or reading from) an object, to reduce the number of transactions and thus increase performance. **This already exists in azureblob, a small issue was fixed here where using a prefix would still require a HEAD request to the prefix itself.**
   - no_head: Don't do a HEAD *after* writing to an object, for the same reason but at the cost of "increasing the chance for undetected upload failures".  **This is still not implemented for azureblob yet and quite complex, see s3.Object.Update()!**
   - no_read_for_metadata: Instead of doing a HEAD to get metadata, use a list operation, to avoid requiring READ permissions for immutable/append-only applications (this seems to be quite azureblob-specific) - one could also use both no_head_object and no_head together to achieve this, but then uploads wouldn't be verified.
   
   Fixes rclone#6162 and rclone#7027

   

   moqmar committed Apr 30, 2024
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