# -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-
#
# mysql handler script for backupninja
#

getconf backupdir /var/backups/mysql
getconf databases all
getconf ignores
getconf nodata
getconf dbhost localhost
getconf hotcopy no
getconf sqldump no
getconf compress yes
getconf vsname

# authentication:
getconf user
getconf dbusername
getconf dbpassword
getconf configfile /etc/mysql/debian.cnf


# Decide if the handler should operate on a vserver or on the host.
# In the former case, check that $vsname exists and is running.
local usevserver=no
local vroot
if [ $vservers_are_available = yes ]; then
   if [ -n "$vsname" ]; then
      # does it exist ?
      if ! vservers_exist "$vsname" ; then
         fatal "The vserver given in vsname ($vsname) does not exist."
      fi
      # is it running ?
      vservers_running $vsname || fatal "The vserver $vsname is not running."
      # everything ok
      info "Using vserver '$vsname'."
      usevserver=yes
      vroot="$VROOTDIR/$vsname"
   else
      info "No vserver name specified, actions will be performed on the host."
   fi
fi

## Prepare ignore part of the command
## This only works for mysqldump at the moment

ignore=''
for i in $ignores $nodata; do
       ignore="$ignore --ignore-table=$i"
done
	
# create backup dirs, $vroot will be empty if no vsname was specified
# and we will instead proceed to operate on the host
[ -d $vroot$backupdir ] || mkdir -p $vroot$backupdir
[ -d $vroot$backupdir ] || fatal "Backup directory '$vroot$backupdir'"
hotdir="$backupdir/hotcopy"
dumpdir="$backupdir/sqldump"

if [ $usevserver = yes ]
then
	[ "$sqldump" == "no" -o -d $vroot$dumpdir ] || $VSERVER $vsname exec mkdir -p $dumpdir
	[ "$hotcopy" == "no" -o -d $vroot$hotdir ] || $VSERVER $vsname exec mkdir -p $hotdir
else
	[ "$sqldump" == "no" -o -d $dumpdir ] || mkdir -p $dumpdir
	[ "$hotcopy" == "no" -o -d $hotdir ] || mkdir -p $hotdir
fi

#######################################################################
## AUTHENTICATION

#
# one of three authentication methods:
# 1. setting the user, so that /home/user/.my.cnf is used.
# 2. specifying the user and password in the handler config,
#    which generates a temporary .my.cnf in /root/.my.cnf
# 3. specify the config file with --defaults-extra-file
#    (this option DOESN'T WORK WITH MYSQLHOTCOPY)
#

# create .my.cnf
# only if dbusername and dbpassword specified.
# we create a tmp file because we don't want to
# specify the password on the command line.

defaultsfile=""

if [ "$dbusername" != "" -a "$dbpassword" != "" ]
then
    if [ $usevserver = yes ]
    then
    	vhome=`$VSERVER $vsname exec getent passwd "root" | @AWK@ -F: '{print $6}'`
	home="$vroot$vhome"
    else
    	home=`getent passwd "root" | @AWK@ -F: '{print $6}'`
    fi

    [ -d $home ] || fatal "Can't find root's home directory ($home)."
    
    mycnf="$home/.my.cnf"
    
    if [ -f $mycnf ]
    then
	# rename temporarily
	tmpcnf="$home/my.cnf.disable"
	debug "mv $mycnf $tmpcnf"
	mv $mycnf $tmpcnf
    fi
    
    oldmask=`umask`
    umask 077
    cat > $mycnf <<EOF
# auto generated backupninja mysql conf
[mysql]
host=$dbhost
user=$dbusername
password="$dbpassword"

[mysqldump]
host=$dbhost
user=$dbusername
password="$dbpassword"

[mysqlhotcopy]
host=$dbhost
user=$dbusername
password="$dbpassword"
EOF
	umask $oldmask
	if [ $usevserver = yes ] 
	then
	    defaultsfile="--defaults-extra-file=$vhome/.my.cnf"
	else
	    defaultsfile="--defaults-extra-file=$mycnf"
	fi
fi

# if a user is not set, use $configfile, otherwise use $mycnf
if [ "$user" == "" ]; then
	user=root;
	defaultsfile="--defaults-extra-file=$configfile"
else
	userset=true;
	if [ $usevserver = yes ]
	then
	    vuserhome=`$VSERVER $vsname exec getent passwd "$user" | @AWK@ -F: '{print $6}'`
	    if [ $? -eq 2 ]
	    then
	    	fatal "User $user not found in /etc/passwd"
	    fi
    	    userhome="$vroot$vuserhome"
	else
	    userhome=`getent passwd "$user" | @AWK@ -F: '{print $6}'`
	    if [ $? -eq 2 ]
	    then
	    	fatal "User $user not found in /etc/passwd"
	    fi
       	fi
	
	debug "User home set to: $userhome"
	[ -f $userhome/.my.cnf ] || fatal "Can't find config file in $userhome/.my.cnf"
	defaultsfile="--defaults-extra-file=$userhome/.my.cnf"
	debug "using $defaultsfile"
fi

#######################################################################
## HOT COPY

if [ "$hotcopy" == "yes" ]
then
    info "Initializing hotcopy method"
    if [ "$databases" == "all" ]
    then
	if [ $usevserver = yes ]
	then
	    	info "dbhost: $dbhost"
		execstr="$VSERVER $vsname exec $MYSQLHOTCOPY -h $dbhost --quiet --allowold --regexp /.\*/./.\*/ $hotdir"
	else
		execstr="$MYSQLHOTCOPY --quiet --allowold --regexp /.\*/./.\*/ $hotdir"
	fi
	debug "su $user -c \"$execstr\""
	if [ ! $test ]
	then
		output=`su $user -c "$execstr" 2>&1`
		code=$?
		if [ "$code" == "0" ]
		then
			debug $output
			info "Successfully finished hotcopy of all mysql databases"
		else
			warning $output
			warning "Failed to hotcopy all mysql databases"
		fi
	fi
    else	
	for db in $databases
	do
		if [ $usevserver = yes ]
		then
			execstr="$VSERVER $vsname exec $MYSQLHOTCOPY --allowold $db $hotdir"
		else
			execstr="$MYSQLHOTCOPY --allowold $db $hotdir"
		fi
		debug 'su $user -c \"$execstr\"'
		if [ ! $test ]
		then
			output=`su $user -c "$execstr" 2>&1`
			code=$?
			if [ "$code" == "0" ]
			then
				debug $output
				info "Successfully finished hotcopy of mysql database $db"
			else
				warning $output
				warning "Failed to hotcopy mysql database $db"
			fi
		fi
	done
     fi
fi

##########################################################################
## SQL DUMP

if [ "$sqldump" == "yes" ]
then
    info "Initializing SQL dump method"
    if [ "$databases" == "all" ]
    then
	if [ $usevserver = yes ]
	then
	    debug 'echo show databases | $VSERVER $vsname exec su $user -c \"$MYSQL $defaultsfile\" | grep -v Database'
	    databases=`echo 'show databases' | $VSERVER $vsname exec su $user -c "$MYSQL $defaultsfile" | grep -v Database`
	    if [ $? -ne 0 ]
	    then
	        fatal "Authentication problem, maybe user/password is wrong or mysqld is not running?"
	    fi
	else
		databases=$(su $user -c "$MYSQL $defaultsfile -N -B -e 'show databases'" | sed 's/|//g;/\+----/d')
		if [ $? -ne 0 ]
		then
		    fatal "Authentication problem, maybe user/password is wrong or mysqld is not running?"
		fi
	fi
    fi

	for db in $databases
	do
           DUMP_BASE="$MYSQLDUMP $defaultsfile --lock-tables --complete-insert --add-drop-table --quick --quote-names"

           # Dumping structure and data
           DUMP="$DUMP_BASE $ignore $db"

           # If requested, dump only the table structure for this database
           if echo "$nodata" | grep -E '(^|[[:space:]])'"$db\." >/dev/null
           then
              # Get the structure of the tables, without data
              DUMP_STRUCT="$DUMP_BASE --no-data $db"
              for qualified_table in $nodata
              do
                 table=$( expr match "$qualified_table" "$db\.\([^\w]*\)" )
                 DUMP_STRUCT="$DUMP_STRUCT $table"
              done
              DUMP="( $DUMP; $DUMP_STRUCT )"
           fi
		if [ $usevserver = yes ]
		then
                   # Test to make sure mysqld is running, if it is not sqldump will not work
                   $VSERVER $vsname exec su $user -c "$MYSQLADMIN $defaultsfile ping"
                   if [ $? -ne 0 ]; then
                      fatal "Either you have an authentication problem, or mysqld doesn't appear to be running!"
                   fi
                   if [ "$compress" == "yes" ]; then
                      execstr="$VSERVER $vsname exec $DUMP | $GZIP > $vroot$dumpdir/${db}.sql.gz"
                   else
                      execstr="$VSERVER $vsname exec $DUMP -r $vroot$dumpdir/${db}.sql"
                   fi
		else
                   # Test to make sure mysqld is running, if it is not sqldump will not work
                   su $user -c "$MYSQLADMIN $defaultsfile ping"
                   if [ $? -ne 0 ]; then
                      fatal "Either you have an authentication problem, or mysqld doesn't appear to be running!"
                   fi
                   if [ "$compress" == "yes" ]; then
                      execstr="$DUMP | $GZIP > $dumpdir/${db}.sql.gz"
                   else
                      execstr="$DUMP -r $dumpdir/${db}.sql"
                   fi
		fi
		debug "su $user -c \"$execstr\""
		if [ ! $test ]
		then
			output=`su $user -c "$execstr" 2>&1`
			code=$?
			if [ "$code" == "0" ]
			then
				debug $output
				info "Successfully finished dump of mysql database $db"
			else
				warning $output
				warning "Failed to dump mysql databases $db"
			fi
		fi
	done
fi

# clean up tmp config file
if [ "$dbusername" != "" -a "$dbpassword" != "" ]
then
	## clean up tmp config file
	debug "rm $mycnf"
	rm $mycnf
	if [ -f "$tmpcnf" ]
	then
		debug "mv $tmpcnf $mycnf"
		mv $tmpcnf $mycnf
	fi
fi

return 0
