[Dovecot] DoveCot compression to save HDD space

[Timo Sirainen]

On Wed, 2007-02-14 at 10:26 -0700, Stephen Warren wrote:
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> Bill Landry wrote:
> >> 1. save the file to some temporary file in a directory where only
> >> deliver has access
> >> 2. change effective UID to destination user (keep the deliver group
> >> effective) and hardlink the file to the user's maildir
> >> 3. change effective UID back to root
> >> 4. process next user, goto 2
> >> 5. Unlink the temporary file
> 
> Permissions are stored in the inode (essentially, with the file itself),
> and not in the directory entry. As such, each hard link to the file
> would share the exact same permissions, so the above algorithm doesn't
> work to give each user their own permissions on the same underlying
> storage file.

That's why I mentioned that the file would have to be owned by root or
another special user. The file would need some world-readable
permissions, which would be enough for IMAP access (there's no need to
modify the file). Also the world-readability shouldn't be a problem
since the maildir directory itself should be restricted to only the one
user.

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