mirror of
https://0xacab.org/liberate/backupninja.git
synced 2024-11-08 20:02:32 +01:00
346 lines
11 KiB
Bash
346 lines
11 KiB
Bash
# -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-
|
|
# vim: set filetype=sh sw=3 sts=3 expandtab autoindent:
|
|
|
|
###############################################################
|
|
#
|
|
# This handler uses dovecot (version 2 or later) dsync backup
|
|
# to backup mail to a remote server.
|
|
#
|
|
# Source and destination directories are typically configured
|
|
# via the dovecot configuration, but can be overridden using
|
|
# the settings here.
|
|
#
|
|
# if the configuration is setup to have keepdaily at 3,
|
|
# keepweekly is 2, and keepmonthly is 1, then each user's
|
|
# maildir backup snapshot directory will contain these files:
|
|
# daily.1
|
|
# daily.2
|
|
# daily.3
|
|
# weekly.1
|
|
# weekly.2
|
|
# monthly.1
|
|
#
|
|
# The basic algorithm is to dsync each user individually,
|
|
# and to use hard links for retaining historical data.
|
|
#
|
|
# For the backup rotation to work, destuser must be able to run
|
|
# arbitrary bash commands on the desthost.
|
|
#
|
|
# If 'remove' is set to 'yes' (default), then any mail directory
|
|
# which is deleted from the source will be moved to a "deleted"
|
|
# directory in the destination. It is up to you to periodically
|
|
# remove this directory or old maildirs in it.
|
|
#
|
|
# Limitations:
|
|
# . because we are not dynamically looking up anything with
|
|
# dovecot's userdb, we expect all data to be under the same
|
|
# tree on both the source and destination
|
|
#
|
|
# . we are assuming a backup to a backup server, so the
|
|
# destination host should have its dovecot mail_location
|
|
# configured to put the mail into
|
|
# $stripped_destdir/$letter/$user/$current_backup
|
|
#
|
|
##############################################################
|
|
|
|
getconf rotate yes
|
|
getconf remove yes
|
|
getconf backup yes
|
|
|
|
getconf keepdaily 5
|
|
getconf keepweekly 3
|
|
getconf keepmonthly 1
|
|
|
|
getconf srcconffile
|
|
getconf destconffile
|
|
getconf srcdir
|
|
getconf destdir
|
|
getconf current_backup current_backup
|
|
getconf desthost
|
|
getconf destport 22
|
|
getconf destuser
|
|
getconf destid_file /root/.ssh/id_rsa
|
|
getconf sshoptions
|
|
|
|
failedcount=0
|
|
|
|
# strip leading mailbox specifier (eg. mdbox:; maildir:, etc)
|
|
stripped_destdir=${destdir/*:/}
|
|
stripped_srcdir=${srcdir/*:/}
|
|
|
|
# strip trailing /
|
|
destdir=${destdir%/}
|
|
srcdir=${srcdir%/}
|
|
|
|
if [ -n "$srcconffile" ]; then
|
|
srcconffile="-c $srcconffile"
|
|
fi
|
|
|
|
if [ -n "$destconffile" ]; then
|
|
destconffile="-c $destconffile"
|
|
fi
|
|
|
|
[ -d $stripped_srcdir ] || fatal "source directory $srcdir doesn't exist"
|
|
|
|
|
|
##################################################################
|
|
### FUNCTIONS
|
|
|
|
function do_user() {
|
|
local user=$1
|
|
local btype=$2
|
|
local letter=${user:0:1}
|
|
local target="$stripped_destdir/$letter/$user/$btype.1"
|
|
local failedcount=0
|
|
local ret=0
|
|
|
|
debug "syncing"
|
|
while [ $failedcount -lt 3 ]; do
|
|
debug $DSYNC $testflags -u $user backup $srcconffile \
|
|
ssh -i $destid_file $destuser@$desthost $DSYNC $destconffile \
|
|
-u $user 2>&1
|
|
ret=`$DSYNC $testflags -u $user backup $srcconffile \
|
|
ssh -i $destid_file $destuser@$desthost $DSYNC $destconffile \
|
|
-u $user 2>&1`
|
|
ret=$?
|
|
if [ $ret == 2 ]; then
|
|
# dsync needs to be run again
|
|
let "failedcount = failedcount + 1"
|
|
elif [ $ret == 0 ]; then
|
|
# things worked, so we break out of the loop
|
|
break
|
|
ssh -o PasswordAuthentication=no $desthost -l $destuser -i $destid_file $sshoptions "date +%c%n%s > $stripped_destdir/$letter/$user/$btype.1/created"
|
|
elif [ $ret != 0 ]; then
|
|
# things did not work in a good way, report it and try again
|
|
warning "dsync $user failed"
|
|
warning " returned: $ret"
|
|
let "failedcount = failedcount + 1"
|
|
fi
|
|
|
|
if [ $failedcount -ge 3 ]; then
|
|
warning "dsync failed 3 times for this user -- something is not working right. bailing out."
|
|
fi
|
|
done
|
|
}
|
|
|
|
# remove any maildirs from backup which might have been deleted
|
|
# and add new ones which have just been created.
|
|
# (actually, it just moved them to the directory "deleted")
|
|
|
|
function do_remove() {
|
|
local tmp1=`maketemp dsync-tmp-file`
|
|
local tmp2=`maketemp dsync-tmp-file`
|
|
|
|
ssh -p $destport -i $destid_file $sshoptions $destuser@$desthost mkdir -p "${stripped_destdir}/deleted"
|
|
cd "$stripped_srcdir"
|
|
for userdir in `ls -d1 */`; do
|
|
ls -1 "$stripped_srcdir/$userdir" | sort > $tmp1
|
|
ssh -p $destport -i $destid_file $sshoptions $destuser@$desthost ls -1 "$stripped_destdir/$userdir" | sort > $tmp2
|
|
for deluser in `join -v 2 $tmp1 $tmp2`; do
|
|
[ "$deluser" != "" ] || continue
|
|
info "removing $destuser@$desthost:$stripped_destdir/$userdir$deluser/"
|
|
ssh -p $destport -i $destid_file $sshoptions $destuser@$desthost mv "$stripped_destdir/$userdir$deluser/" "$stripped_destdir/deleted"
|
|
ssh -p $destport -i $destid_file $sshoptions $destuser@$desthost "date +%c%n%s > '$stripped_destdir/deleted/$deluser/deleted_on'"
|
|
done
|
|
done
|
|
rm $tmp1
|
|
rm $tmp2
|
|
}
|
|
|
|
function do_rotate() {
|
|
[ "$rotate" == "yes" ] || return;
|
|
local user=$1
|
|
local letter=${user:0:1}
|
|
local backuproot="$stripped_destdir/$letter/$user"
|
|
(
|
|
ssh -T -o PasswordAuthentication=no $desthost -l $destuser -i $destid_file $sshoptions <<EOF
|
|
##### BEGIN REMOTE SCRIPT #####
|
|
seconds_daily=86400
|
|
seconds_weekly=604800
|
|
seconds_monthly=2628000
|
|
keepdaily=$keepdaily
|
|
keepweekly=$keepweekly
|
|
keepmonthly=$keepmonthly
|
|
now=\`date +%s\`
|
|
|
|
if [ ! -d "$backuproot" ]; then
|
|
echo "Debug: skipping rotate of $user. $backuproot doesn't exist."
|
|
exit
|
|
fi
|
|
|
|
for rottype in daily weekly monthly; do
|
|
seconds=\$((seconds_\${rottype}))
|
|
|
|
dir="$backuproot/\$rottype"
|
|
if [ ! -d \$dir.1 ]; then
|
|
echo "Debug: \$dir.1 does not exist, skipping."
|
|
continue 1
|
|
fi
|
|
|
|
# Rotate the current list of backups, if we can.
|
|
oldest=\`find $backuproot -maxdepth 1 -type d -name \$rottype'.*' | @SED@ 's/^.*\.//' | sort -n | tail -1\`
|
|
#echo "Debug: oldest \$oldest"
|
|
[ "\$oldest" == "" ] && oldest=0
|
|
for (( i=\$oldest; i > 0; i-- )); do
|
|
if [ -d \$dir.\$i ]; then
|
|
if [ -f \$dir.\$i/created ]; then
|
|
created=\`tail -1 \$dir.\$i/created\`
|
|
else
|
|
created=0
|
|
fi
|
|
cutoff_time=\$(( now - (seconds*(i-1)) ))
|
|
if [ ! \$created -gt \$cutoff_time ]; then
|
|
next=\$(( i + 1 ))
|
|
if [ ! -d \$dir.\$next ]; then
|
|
echo "Debug: \$rottype.\$i --> \$rottype.\$next"
|
|
mv \$dir.\$i \$dir.\$next
|
|
date +%c%n%s > \$dir.\$next/rotated
|
|
else
|
|
echo "Debug: skipping rotation of \$dir.\$i because \$dir.\$next already exists."
|
|
fi
|
|
else
|
|
echo "Debug: skipping rotation of \$dir.\$i because it was created" \$(( (now-created)/86400)) "days ago ("\$(( (now-cutoff_time)/86400))" needed)."
|
|
fi
|
|
fi
|
|
done
|
|
done
|
|
|
|
max=\$((keepdaily+1))
|
|
if [ \( \$keepweekly -gt 0 -a -d $backuproot/daily.\$max \) -a ! -d $backuproot/weekly.1 ]; then
|
|
echo "Debug: daily.\$max --> weekly.1"
|
|
mv $backuproot/daily.\$max $backuproot/weekly.1
|
|
date +%c%n%s > $backuproot/weekly.1/rotated
|
|
fi
|
|
|
|
max=\$((keepweekly+1))
|
|
if [ \( \$keepmonthly -gt 0 -a -d $backuproot/weekly.\$max \) -a ! -d $backuproot/monthly.1 ]; then
|
|
echo "Debug: weekly.\$max --> monthly.1"
|
|
mv $backuproot/weekly.\$max $backuproot/monthly.1
|
|
date +%c%n%s > $backuproot/monthly.1/rotated
|
|
fi
|
|
|
|
for rottype in daily weekly monthly; do
|
|
max=\$((keep\${rottype}+1))
|
|
dir="$backuproot/\$rottype"
|
|
oldest=\`find $backuproot -maxdepth 1 -type d -name \$rottype'.*' | @SED@ 's/^.*\.//' | sort -n | tail -1\`
|
|
[ "\$oldest" == "" ] && oldest=0
|
|
# if we've rotated the last backup off the stack, remove it.
|
|
for (( i=\$oldest; i >= \$max; i-- )); do
|
|
if [ -d \$dir.\$i ]; then
|
|
if [ -d $backuproot/rotate.tmp ]; then
|
|
echo "Debug: removing rotate.tmp"
|
|
rm -rf $backuproot/rotate.tmp
|
|
fi
|
|
echo "Debug: moving \$rottype.\$i to rotate.tmp"
|
|
mv \$dir.\$i $backuproot/rotate.tmp
|
|
fi
|
|
done
|
|
done
|
|
####### END REMOTE SCRIPT #######
|
|
EOF
|
|
) | (while read a; do passthru $a; done)
|
|
|
|
}
|
|
|
|
|
|
function setup_remote_dirs() {
|
|
local user=$1
|
|
local backuptype=$2
|
|
local letter=${user:0:1}
|
|
local dir="$stripped_destdir/$letter/$user/$backuptype"
|
|
local tmpdir="$stripped_destdir/$letter/$user/rotate.tmp"
|
|
(
|
|
ssh -T -o PasswordAuthentication=no $desthost -l $destuser -i $destid_file $sshoptions <<EOF
|
|
if [ ! -d $stripped_destdir ]; then
|
|
echo "Fatal: Destination directory $stripped_destdir does not exist on host $desthost."
|
|
exit 1
|
|
elif [ -d $dir.1 ]; then
|
|
if [ -f $dir.1/created ]; then
|
|
echo "Warning: $dir.1 already exists. Overwriting contents."
|
|
else
|
|
echo "Warning: we seem to be resuming a partially written $dir.1"
|
|
fi
|
|
else
|
|
if [ -d $tmpdir ]; then
|
|
mv $tmpdir $dir.1
|
|
if [ \$? == 1 ]; then
|
|
echo "Fatal: could not mv $stripped_destdir/rotate.tmp $dir.1 on host $desthost"
|
|
exit 1
|
|
fi
|
|
else
|
|
mkdir --parents $dir.1
|
|
if [ \$? == 1 ]; then
|
|
echo "Fatal: could not create directory $dir.1 on host $desthost"
|
|
exit 1
|
|
fi
|
|
fi
|
|
if [ -d $dir.2 ]; then
|
|
echo "Debug: update links $backuptype.2 --> $backuptype.1"
|
|
cp -alf $dir.2/. $dir.1
|
|
#if [ \$? == 1 ]; then
|
|
# echo "Fatal: could not create hard links to $dir.1 on host $desthost"
|
|
# exit 1
|
|
#fi
|
|
fi
|
|
fi
|
|
[ -f $dir.1/created ] && rm $dir.1/created
|
|
[ -f $dir.1/rotated ] && rm $dir.1/rotated
|
|
exit 0
|
|
EOF
|
|
) | (while read a; do passthru $a; done)
|
|
|
|
if [ $? == 1 ]; then exit; fi
|
|
}
|
|
|
|
###
|
|
##################################################################
|
|
|
|
# see if we can login
|
|
debug "ssh -o PasswordAuthentication=no $desthost -l $destuser -i $destid_file $sshoptions 'echo -n 1'"
|
|
if [ ! $test ]; then
|
|
result=`ssh -o PasswordAuthentication=no $desthost -l $destuser -i $destid_file $sshoptions 'echo -n 1' 2>&1`
|
|
if [ "$result" != "1" ]; then
|
|
fatal "Can't connect to $desthost as $destuser using $destid_file."
|
|
fi
|
|
fi
|
|
|
|
## SANITY CHECKS ##
|
|
status=`ssh -p $destport -i $destid_file $sshoptions $destuser@$desthost "[ -d \"$stripped_destdir\" ] && echo 'ok'"`
|
|
if [ "$status" != "ok" ]; then
|
|
fatal "Destination directory $stripped_destdir doesn't exist!"
|
|
exit
|
|
fi
|
|
|
|
### REMOVE OLD MAILDIRS ###
|
|
|
|
if [ "$remove" == "yes" ]; then
|
|
do_remove
|
|
fi
|
|
|
|
### MAKE BACKUPS ###
|
|
|
|
if [ "$backup" == "yes" ]; then
|
|
if [ $keepdaily -gt 0 ]; then btype=daily
|
|
elif [ $keepweekly -gt 0 ]; then btype=weekly
|
|
elif [ $keepmonthly -gt 0 ]; then btype=monthly
|
|
else fatal "keeping no backups"; fi
|
|
|
|
if [ "$testuser" != "" ]; then
|
|
cd "$stripped_srcdir/${user:0:1}"
|
|
do_rotate $testuser
|
|
setup_remote_dirs $testuser $btype
|
|
do_user $testuser $btype
|
|
else
|
|
[ -d "$stripped_srcdir" ] || fatal "directory $stripped_srcdir not found."
|
|
for user in `@DOVEADM@ user \* | cut -d@ -f1`
|
|
do
|
|
debug $user
|
|
[ "$user" != "" ] || continue
|
|
do_rotate $user
|
|
setup_remote_dirs $user $btype
|
|
do_user $user $btype
|
|
done
|
|
fi
|
|
fi
|
|
|