# -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-
# vim: set filetype=sh sw=3 sts=3 expandtab autoindent:
#
# 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 sqldumpoptions "--lock-tables --complete-insert --add-drop-table --quick --quote-names"
getconf compress yes

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


## 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
# and we will instead proceed to operate on the host
[ -d $backupdir ] || mkdir -p $backupdir
[ -d $backupdir ] || fatal "Backup directory '$backupdir'"
hotdir="$backupdir/hotcopy"
dumpdir="$backupdir/sqldump"

[ "$sqldump" == "no" -o -d $dumpdir ] || mkdir -p $dumpdir
[ "$hotcopy" == "no" -o -d $hotdir ] || mkdir -p $hotdir

#######################################################################
## 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 [ -n "$dbusername" -a -n "$dbpassword" ]
then
   home=`getent passwd "root" | @AWK@ -F: '{print $6}'`

   [ -d $home ] || fatal "Can't find root's home directory ($home)."

   mycnf="$home/.my.cnf"

   workcnf="$mycnf"

   if [ -f $workcnf ]
   then
      # rename temporarily
      tmpcnf="$workcnf.disable"
      debug "mv $workcnf $tmpcnf"
      mv $workcnf $tmpcnf
   fi

   oldmask=`umask`
   umask 077
   cat > $workcnf <<EOF
# auto generated backupninja mysql conf
[mysql]
host=$dbhost
user=$dbusername
password="$dbpassword"

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

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

[mysqladmin]
host=$dbhost
user=$dbusername
password="$dbpassword"
EOF
   umask $oldmask
   defaultsfile="--defaults-extra-file=$mycnf"

# else, if a user is set use her .my.cnf
elif [ -n "$user" ]
then
   userset=true;

   userhome=`getent passwd "$user" | @AWK@ -F: '{print $6}'`
   if [ $? -eq 2 ]
   then
      fatal "User $user not found in /etc/passwd"
   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"
   # otherwise use $configfile
else
   user=root
   defaultsfile="--defaults-extra-file=$configfile"
fi

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

if [ "$hotcopy" == "yes" ]
then
   info "Initializing hotcopy method"
   if [ "$databases" == "all" ]
   then
      execstr="$MYSQLHOTCOPY --quiet --allowold --regexp /.\*/./.\*/ $hotdir"
      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 $databases
      do
         execstr="$MYSQLHOTCOPY --allowold $db $hotdir"
         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
      databases=$(set -o pipefail ; su $user -c "$MYSQL $defaultsfile -N -B -e 'show databases'" | sed 's/|//g;/\+----/d;/^\(information\|performance\)_schema$/d')
      if [ $? -ne 0 ]
      then
         fatal "Authentication problem, maybe user/password is wrong or mysqld is not running?"
      fi
   fi

   for db in $databases
   do
      # Sanitize database name
      db=$(echo $db | tr -d \'\;)

      DUMP_BASE="$MYSQLDUMP $defaultsfile $sqldumpoptions"

      # 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\.\(.\+\)" )
            DUMP_STRUCT="$DUMP_STRUCT $table"
         done
         DUMP="( $DUMP; $DUMP_STRUCT )"
      fi

      # Test to make sure mysqld is running, if it is not sqldump will not work
      su $user -c "$MYSQLADMIN $defaultsfile ping 2>&1 >/dev/null"
      if [ $? -ne 0 ]; then
         fatal "mysqld doesn't appear to be running!"
      fi
      if [ "$compress" == "yes" ]; then
         execstr="$DUMP | $GZIP $GZIP_OPTS > '$dumpdir/${db}.sql.gz'"
      else
         execstr="$DUMP > '$dumpdir/${db}.sql'"
      fi
      debug "su $user -c \"$execstr\""

      if [ ! $test ]
      then
         output=`su $user -s /bin/bash -c "set -o pipefail ; $execstr" 2>&1`
         code=$?
         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 $workcnf"
   rm $workcnf
   if [ -f "$tmpcnf" ]
   then
      debug "mv $tmpcnf $workcnf"
      mv $tmpcnf $workcnf
   fi
fi

return 0