Install dovecot from backports (for imapc).

Interesting features include caching of mail headers (v2.2.8+) as well
as new IMAP capabilities.

4 files changed, 20 insertions, 8 deletions

diff --git a/roles/IMAP-proxy/files/etc/dovecot/conf.d/10-auth.conf b/roles/IMAP-proxy/files/etc/dovecot/conf.d/10-auth.conf
index 229ac94..1abea0c 100644
--- a/roles/IMAP-proxy/files/etc/dovecot/conf.d/10-auth.conf
+++ b/roles/IMAP-proxy/files/etc/dovecot/conf.d/10-auth.conf
@@ -6,6 +6,7 @@
 # SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP
 # matches the local IP (ie. you're connecting from the same computer), the
 # connection is considered secure and plaintext authentication is allowed.
+# See also ssl=required setting.
 disable_plaintext_auth = yes
 
 # Authentication cache size (e.g. 10M). 0 means it's disabled. Note that
diff --git a/roles/IMAP-proxy/files/etc/dovecot/conf.d/10-mail.conf b/roles/IMAP-proxy/files/etc/dovecot/conf.d/10-mail.conf
index f106af5..e19b507 100644
--- a/roles/IMAP-proxy/files/etc/dovecot/conf.d/10-mail.conf
+++ b/roles/IMAP-proxy/files/etc/dovecot/conf.d/10-mail.conf
@@ -98,7 +98,7 @@ namespace inbox {
   #list = children
 #}
 # Should shared INBOX be visible as "shared/user" or "shared/user/INBOX"?
-#mail_shared_explicit_inbox = yes
+#mail_shared_explicit_inbox = no
 
 # System user and group used to access mails. If you use multiple, userdb
 # can override these by returning uid or gid fields. You can use either numbers
@@ -124,6 +124,10 @@ mail_gid = imapproxy
 # or ~user/.
 #mail_full_filesystem_access = no
 
+# Dictionary for key=value mailbox attributes. Currently used by URLAUTH, but
+# soon intended to be used by METADATA as well.
+#mail_attribute_dict =
+
 ##
 ## Mail processes
 ##
@@ -207,6 +211,10 @@ mail_plugins = virtual
 ## Mailbox handling optimizations
 ##
 
+# Mailbox list indexes can be used to optimize IMAP STATUS commands. They are
+# also required for IMAP NOTIFY extension to be enabled.
+mailbox_list_index = yes
+
 # The minimum number of mails in a mailbox before updates are done to cache
 # file. This allows optimizing Dovecot's behavior to do less disk writes at
 # the cost of more disk reads.
@@ -276,8 +284,14 @@ mail_plugins = virtual
 # in is important to avoid deadlocks if other MTAs/MUAs are using multiple
 # locking methods as well. Some operating systems don't allow using some of
 # them simultaneously.
+#
+# The Debian value for mbox_write_locks differs from upstream Dovecot. It is
+# changed to be compliant with Debian Policy (section 11.6) for NFS safety.
+# Dovecot: mbox_write_locks = dotlock fcntl
+# Debian: mbox_write_locks = fcntl dotlock
+#
 #mbox_read_locks = fcntl
-#mbox_write_locks = dotlock fcntl
+#mbox_write_locks = fcntl dotlock
 
 # Maximum time to wait for lock (all of them) before aborting.
 #mbox_lock_timeout = 5 mins
@@ -341,8 +355,6 @@ mail_plugins = virtual
 # also allows single instance storage for them. Other backends don't support
 # this for now.
 
-# WARNING: This feature hasn't been tested much yet. Use at your own risk.
-
 # Directory root where to store mail attachments. Disabled, if empty.
 #mail_attachment_dir =
 
diff --git a/roles/IMAP-proxy/files/etc/dovecot/conf.d/20-imapc.conf b/roles/IMAP-proxy/files/etc/dovecot/conf.d/20-imapc.conf
index 47785a4..32cc391 100644
--- a/roles/IMAP-proxy/files/etc/dovecot/conf.d/20-imapc.conf
+++ b/roles/IMAP-proxy/files/etc/dovecot/conf.d/20-imapc.conf
@@ -12,7 +12,6 @@ imapc_user = %u
 mail_prefetch_count = 20
 
 # The list of valid features can be found there
-# http://hg.dovecot.org/dovecot-2.1/file/f572fbafb445/src/lib-storage/index/imapc/imapc-settings.c
+# http://hg.dovecot.org/dovecot-2.2/file/tip/src/lib-storage/index/imapc/imapc-settings.c
 # (in the struct 'imapc_feature_list imapc_feature_list')
-imapc_features = rfc822.size
-
+imapc_features = rfc822.size fetch-headers
diff --git a/roles/IMAP-proxy/tasks/main.yml b/roles/IMAP-proxy/tasks/main.yml
index f76ee72..4a1984c 100644
--- a/roles/IMAP-proxy/tasks/main.yml
+++ b/roles/IMAP-proxy/tasks/main.yml
@@ -1,5 +1,5 @@
 - name: Install Dovecot
-  apt: pkg={{ item }}
+  apt: pkg={{ item }} default_release={{ ansible_lsb.codename }}-backports
   with_items:
     - dovecot-core
     - dovecot-imapd