dsync backup touch source index files.

Hi everyone,

Can someone explain me why dsync need read-write access to source box when pulling data (dsync -R backup)?

I am working on migration from Dovecot 1.x with maildir to latest Dovecot 2.2.15 with mdbox and found that there is no way to do this from ro filesystem (got "failed: Read-only file system" on access to /dovecot.index.log).

I am wondering is it bug or feature?

I am not sure that this is save to allow dsync v2.2.15 to have write access to v1.x indexes.

-- Anton Chevychalov