From d83f96dd43df846582940270bc83b13dbe97c1be Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Sun, 11 Dec 2016 14:34:52 +0100
Subject: Initial draft of dsync sync script.

---
 bin/mailsync-dsync | 132 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100755 bin/mailsync-dsync

diff --git a/bin/mailsync-dsync b/bin/mailsync-dsync
new file mode 100755
index 0000000..5fe80a7
--- /dev/null
+++ b/bin/mailsync-dsync
@@ -0,0 +1,132 @@
+#!/bin/sh
+# Copyright © 2015-2016 Jonas Smedegaard <dr@jones.dk>
+# Description: Synchronize mail using Dovecot tool dsync
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# Depends: dovecot-core
+# Recommends: moreutils
+#
+# FIXME
+#  * Generailze account resolving (avoid hardcoded accounts)
+#
+# TODO
+#  * Gracefully serialize (with warning) if parallel not available
+#  * Add option to not parallelize (and not warn if parallel missing)
+#  * Add global lock
+#  * Handle "region" derived from profile:
+#    + Avoid parallelize same-region profiles
+#    + Lock each region separately
+#  * Parse configfile for profiles
+
+set -e
+
+PRG=$(basename "$0")
+
+showhelp() {
+	cat <<EOF
+Usage: $PRG [--tomuch] [--] PROFILE [PROFILE...]
+Synchronize one or more Dovecot Maildir profiles
+
+  --toomuch         Don't update notmuch database after syncronization
+  --debug           Enable debugging output
+  --alive           Monitor SSH connection that server is alive
+  --reset           Clear state tracking to force full sync
+  -h, --help        This help text
+
+Examples:
+  $PRG jones hb
+  $PRG --toomuch jones
+EOF
+}
+
+exit1() {
+	response="${1:+Error: }${1:-Internal error!}"
+	echo >&2 "$response"
+	exit 1
+}
+
+# parse cmdline options
+TEMP="`getopt -s sh -o h -l help,toomuch,debug,alive,reset -n "$PRG" -- "$@"`" || exit1 "Internal getopt error."
+eval set -- "$TEMP"
+while true ; do
+	case "$1" in
+	-h|--help) showhelp; exit;;
+	--toomuch) toomuch=yes; shift;;
+	--debug) debug=yes; shift;;
+	--alive) alive=yes; shift;;
+	--reset) reset=yes; shift;;
+	--) shift; break;;
+	*) exit1 "Internal error resolving options.";;
+	esac
+done
+
+[ $# -gt 0 ] || set -- jones debian bb hb lxp5
+
+_nice() {
+#	ionice -c 3 chrt --idle 0 /bin/sh -c "$@"
+	"$@"
+}
+
+_dsync() {
+	profile="$1"
+	case "$profile" in
+		jones) host=mail.jones.dk;;
+		debian) host=jonas-debian@mail.jones.dk;;
+		bb) host=mail.bitbase.dk;;
+		hb) host=mail.homebase.dk;;
+#		db) host=db.letsgo.dk;;
+#		lb) host=lb.letsgo.dk;;
+		lxp5) host=lxp5.free-owl.de;;
+		*) exit1 "Wrong account \"$account\"";;
+	esac
+	for algo in ed25519 ecdsa dsa rsa; do
+		key="$HOME/.ssh/id_${algo}_mail_$profile"
+		if [ -f "$key" ] && [ -f "$key.pub" ]; then
+			break
+		fi
+		key=
+	done
+	cachedir="$HOME/.cache/mydsync"
+	statefile="$cachedir/$profile"
+	[ -z "$reset" ] || rm -f "$statefile" "$statefile"~
+	if [ -s "$statefile" ]; then
+		cp -f "$statefile" "$statefile"~
+	else
+		touch "$statefile"
+	fi
+	state="$(cat "$statefile")"
+	if [ -z "$state" ] && [ -f "$statefile"~ ]; then
+		state="$(cat "$statefile"~)"
+	fi
+	mkdir -p "$cachedir"
+	[ -n "$key" ] || exit1 "ssh key missing for $profile"
+	_nice doveadm ${debug:+-D} \
+		-o mail_location=maildir:~/Maildir/"$profile" \
+		sync -s "$state" -x spam -x Junk -x Trash \
+		ssh -i "$key" -o BatchMode=yes \
+			${alive:+-o ServerAliveInterval=10 -o ServerAliveCountMax=5} \
+			"$host" doveadm dsync-server \
+		> "$statefile"
+}
+
+case $# in
+    0)
+	exit1 "Internal error: no arguments to process";;
+    1)
+	_dsync "$1";;
+    *)
+	parallel -i sh -c "$0 --toomuch ${debug:+--debug} ${alive:+--alive} ${reset:+--reset} {}" -- "$@";;
+esac
+[ -n "$toomuch" ] || _nice notmuch new
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