Snapshot Mounting in KopiaUI Fails While Command Line Succeeds - Windows 10

[samomar]

Description:

There is an issue with KopiaUI where mounting a snapshot to the Z:\ drive fails with the error Z:\ is unavailable. However, when running the same command directly via the command line, the snapshot mounts successfully to Z:\. This suggests that KopiaUI may be using arguments or methods that cause inconsistent behavior when handling certain drive letters.

Steps to Reproduce:

1. Open KopiaUI on Windows 10.
2. Try to mount a snapshot to Z:\ using the UI's mount feature.
3. Observe the error: Z:\ is unavailable. If the location is on this PC, make sure the device or drive is connected....
4. Run the same command via Command Prompt:

   C:\Users\Username\Downloads\KopiaUI-0.17.0-win\resources\server\kopia.exe mount <snapshot ID> Z: --browse
   

5. Observe that the snapshot mounts successfully via the command line.

Expected Behavior:

KopiaUI should behave consistently with the command line, allowing the snapshot to be mounted to the Z:\ drive without errors.

Actual Behavior:

KopiaUI fails to mount the snapshot to Z:\, while the command line mounts it without issue.

Environment:

• KopiaUI Version: 0.17.0
• OS: Windows 10
• Snapshot Command (via CLI):

  C:\Users\Username\Downloads\KopiaUI-0.17.0-win\resources\server\kopia.exe mount <snapshot ID> Z: --browse
  

• Snapshot ID: k9857cfff2abadaf5f0eb2a26780dae1f
• Source Path: C:\Users\Username\Music
• Snapshot Size: 16.8 GB

Troubleshooting Attempts:

1. Successfully mounted the snapshot to Z:\ via the command line using the same parameters.
2. The issue is isolated to the UI, as the CLI mount works without any issues, suggesting that KopiaUI might be passing additional or incorrect arguments leading to inconsistent behavior.

Possible Causes:

• UI Argument Handling: KopiaUI may be handling arguments incorrectly when attempting to mount snapshots, leading to drive letter conflicts or misconfiguration.
• Inconsistent UI Behavior: KopiaUI might be executing additional logic or using different system calls than the command line version of kopia.exe, which could be causing the issue.

Suggested Fix:

• Investigate the argument handling logic in KopiaUI when performing snapshot mounting.
• Ensure that the UI is using the same methods and arguments as the command line interface to prevent inconsistent behavior.
• Provide more detailed error logging in the UI to help diagnose potential discrepancies between UI and CLI behavior.

References:

• Kopia documentation on mounting snapshots
• Related issue on GitHub discussing mounting inconsistencies