NAS-139149 / 26.04 / batch cryptdecode

[stavros-k]

After figuring out why the UI wouldnt show the decrypted dir names (truenas/webui#13058)
I saw that one of my buckets wouldn't show the decrypted names for the root dir, but would for subdirs.

It looks like the cryptdecode has a hard limit of 10 items per call (https://github.com/rclone/rclone/blob/28c187b9b49a9785a7f47a802c74e8a8aedf11c6/cmd/cryptdecode/cryptdecode.go#L48). So in this PR i'm batching the file names to cryptdecode.

Backport to 25.10.2 would be nice.

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-139149

[Copilot]

Pull request overview

This PR fixes a bug where directories with more than 10 encrypted files would not have their names decrypted in the UI. The issue was caused by rclone's cryptdecode command having a hard limit of 10 items per call. The fix batches the encrypted filenames into groups of 10 and processes them sequentially.

Key Changes

• Introduced batching logic to process encrypted filenames in groups of 10
• Added clear comments explaining the rclone cryptdecode limit
• Maintained existing error handling and result accumulation logic

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[yocalebo]

Thanks! Though.... I hate we're fork+exec'ing here ☹️ . It also seems a bit like pseudo-security to encrypt file names..... paranoia abounds

[stavros-k]

Note: *Due to itertools.batched, this cant backported to 25.10.2

[bugclerk]

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