I2PSnark handles inaccessible storage dir badly

[Reportage]

On startup, if I2PSnark cannot find the configured storage directory, it fails to start. Making the storage directory available and then starting I2PSnark causes abnormal disk access and takes a very long time to initialize.

In the event that the configured storage directory isn't found, it might be better to fallback to the default storage location and add a notification to the screen log that the configured location is inaccessible etc.

[zzz]

yup, known problem

[zzz]

• start even if dir doesn't exist and can't create
• retry create on refresh
• show message if can't create or if empty and not writable
• try to create after config change
• hide add/create forms if dir doesn't exist or not writable

In 7aee68c5e258dd79b9bd89aafbdf490b35687c61 0.9.33-19