#!/bin/sh
#
# mkmysqldump -- dump MySQL (master) data
# Copyright (c)2015 Alexander Barton <alex@barton.de>
#

NAME=$(basename "$0")

# Defaults
MYHOST="localhost"
MYUSER="root"
MYPW=""
OUTFILE="$(hostname -s)-$(date "+%Y%m%d-%H%M%S").sql"
STATS=""

Help() {
	echo "$NAME [<options> ...]"
	echo
	echo "  --host|-h <host>"
	echo "      MySQL server hostname [\"$MYHOST\"]."
	echo "  --user|-u <user>"
	echo "      MySQL server user [\"$MYUSER\"]."
	echo "  --password|-p <password>"
	echo "      MySQL server password [\"$MYPW\"]".
	echo "  --outfile|-o <file>"
	echo "      Path and name of SQL dump file [\"$OUTFILE\"]."
	echo "  --outdir|-d <directory>"
	echo "      Directory for automatically named dump files."
	echo "  --summary|-s"
	echo "      Display file and file system status summary."
	echo
}

Usage() {
	Help
	exit 2
}

for cmd in mysql mysqldump; do
	if ! which "$cmd" >/dev/null 2>&1; then
		echo "$NAME: \"$cmd\" command not found!"
		exit 1
	fi
done

while [ $# -gt 0 ]; do
	case "$1" in
	  "--host"|"-h")
	  	[ $# -ge 2 ] || Usage
		MYHOST="$2"
		shift 2
		;;
	  "--user"|"-u")
		[ $# -ge 2 ] || Usage
		MYHOST="$2"
		shift 2
		;;
	  "--password"|"-p")
		[ $# -ge 2 ] || Usage
		MYPW="$2"
		shift 2
		;;
	  "--outfile"|"-o")
		[ $# -ge 2 ] || Usage
		OUTFILE="$2"
		shift 2
		;;
	  "--outdir"|"-d")
		[ $# -ge 2 ] || Usage
		OUTFILE="$2/$(hostname -s)-$(date "+%Y%m%d-%H%M%S").sql"
		shift 2
		;;
	  "--summary"|"-s")
		STATS=1
		shift
		;;
	  "--help")
	  	Help
		exit 0
		;;
	  *)
		Usage
	esac
done

echo "Dumping MySQL server on \"$MYHOST\" (user \"$MYUSER\"):"
umask 0077

[ -n "$MYPW" ] && PWSWITCH="--password='$MYPW'" || PWSWITCH=""

echo "Getting list of databases from server ..."
DATABASES=$(
	mysql -h "$MYHOST" -u "$MYUSER" $PWSWITCH -e 'show databases' \
	 | grep "^\| " | cut -d' ' -f2 | grep -v "Database" \
	 | grep -v "information_schema" \
	 | grep -v "performance_schema" \
	 | grep -v "mysql"
)
if [ $? -ne 0 ]; then
	echo "Failed to get list of databases! Aborting!"
	exit 1
fi

echo "Dumping SQL data to file \"$OUTFILE\" ..."
CMD="mysqldump \
	-h $MYHOST \
	-u $MYUSER \
	$PWSWITCH \
	--lock-all-tables \
	--master-data=1 \
	--databases $DATABASES"

echo "Start: $(date)"
echo $CMD
$CMD >"$OUTFILE"; r=$?
echo "End: $(date)"

[ $r -eq 0 ] \
	&& echo "Dump command exited with code 0, success." \
	|| echo "Dump command FAILED with code $r!" >&2

if [ -e "$OUTFILE" -a -n "$STATS" ]; then
	echo
	echo "SQL dump file"
	ls -lh "$OUTFILE"
	echo
	df -h "$OUTFILE"
	echo
fi

exit $r