From 1038fa3d50bda90377117559a9f685e2e7389d8f Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Sat, 10 Dec 2016 17:40:49 +0100
Subject: dovecot: use Single-Instance Storage for mail attachments.

---
 roles/IMAP/files/etc/cron.d/doveadm              |  3 +++
 roles/IMAP/files/etc/dovecot/conf.d/10-mail.conf |  6 +++---
 roles/IMAP/tasks/imap.yml                        | 20 ++++++++++++--------
 3 files changed, 18 insertions(+), 11 deletions(-)
 create mode 100644 roles/IMAP/files/etc/cron.d/doveadm

(limited to 'roles/IMAP')

diff --git a/roles/IMAP/files/etc/cron.d/doveadm b/roles/IMAP/files/etc/cron.d/doveadm
new file mode 100644
index 0000000..1f1f139
--- /dev/null
+++ b/roles/IMAP/files/etc/cron.d/doveadm
@@ -0,0 +1,3 @@
+MAILTO=root
+
+7 5 * * *  vmail  test -x /usr/bin/doveadm && nice -n 19 /usr/bin/doveadm sis deduplicate /home/mail/attachments /home/mail/attachments/queue
diff --git a/roles/IMAP/files/etc/dovecot/conf.d/10-mail.conf b/roles/IMAP/files/etc/dovecot/conf.d/10-mail.conf
index ab5ceef..2e68df4 100644
--- a/roles/IMAP/files/etc/dovecot/conf.d/10-mail.conf
+++ b/roles/IMAP/files/etc/dovecot/conf.d/10-mail.conf
@@ -362,7 +362,7 @@ mdbox_preallocate_space = yes
 # this for now.
 
 # Directory root where to store mail attachments. Disabled, if empty.
-#mail_attachment_dir =
+mail_attachment_dir = /home/mail/attachments
 
 # Attachments smaller than this aren't saved externally. It's also possible to
 # write a plugin to disable saving specific attachments externally.
@@ -372,9 +372,9 @@ mdbox_preallocate_space = yes
 #  posix : No SiS done by Dovecot (but this might help FS's own deduplication)
 #  sis posix : SiS with immediate byte-by-byte comparison during saving
 #  sis-queue posix : SiS with delayed comparison and deduplication
-#mail_attachment_fs = sis posix
+mail_attachment_fs = sis-queue /home/mail/attachments/queue:posix
 
 # Hash format to use in attachment filenames. You can add any text and
 # variables: %{md4}, %{md5}, %{sha1}, %{sha256}, %{sha512}, %{size}.
 # Variables can be truncated, e.g. %{sha256:80} returns only first 80 bits
-#mail_attachment_hash = %{sha1}
+mail_attachment_hash = %{sha256}
diff --git a/roles/IMAP/tasks/imap.yml b/roles/IMAP/tasks/imap.yml
index 51e7694..f4a23e4 100644
--- a/roles/IMAP/tasks/imap.yml
+++ b/roles/IMAP/tasks/imap.yml
@@ -36,11 +36,21 @@
         owner=root group=root
         mode=0755
 
-- name: Create /home/mail/virtual
-  file: path=/home/mail/virtual
+- name: Create /home/mail/{virtual,attachments,spamspool}
+  file: path=/home/mail/{{ item }}
         state=directory
         owner=vmail group=vmail
         mode=0700
+  with_items:
+    - virtual
+    - attachments
+    - spamspool
+
+- name: Create a cronjob for SIS deduplication
+  copy: src=etc/cron.d/doveadm
+        dest=/etc/cron.d/doveadm
+        owner=root group=root
+        mode=0644
 
 - name: Create virtual mailbox directories
   file: path=/etc/dovecot/virtual/{{ item }}
@@ -64,12 +74,6 @@
     - recent
     - unseen
 
-- name: Create directory /home/mail/spamspool
-  file: path=/home/mail/spamspool
-        state=directory
-        owner=vmail group=vmail
-        mode=0700
-
 - name: Create directory /etc/dovecot/ssl
   file: path=/etc/dovecot/ssl
         state=directory
-- 
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