mount-tmpfs

#!/bin/bash

# This script simply mounts a tmpfs filesystem at build/test/cassandra
# If there is already a tmpfs mounted at that location, it will be unmounted first
# The size of the tmpfs is 1GB

# The script is expected to work on both Linux and MacOS

# Run the script from the root of your project. In most cases it should improve performance of running unit tests.
# Do not run it using sudo, it will ask for sudo password if needed.
# The script does not expect any arguments.

(grep "apache-cassandra" build.xml || grep "dse-db" build.xml) 1> /dev/null

os="$(uname | tr '[:upper:]' '[:lower:]')"

if [[ "$os" == "darwin" ]]; then
	existing="$(diskutil list | grep CassandraBuildTmp || true)"
	if [[ -n "$existing" ]]; then
		diskname="$(hdiutil | grep CassandraBuildTmp | cut -f 1)"
		diskutil unmount CassandraBuildTmp
		hdiutil detach "$diskname"
	fi

	rm -rf build/test/cassandra
	mkdir -p build/test/cassandra

	diskutil erasevolume HFS+ CassandraBuildTmp "$(hdiutil attach -nomount ram://2097152)"
	diskutil mount -mountPoint "$(pwd)/build/test/cassandra" CassandraBuildTmp
elif [[ "$os" == "linux" ]]; then
	mount | grep tmpfs | grep /build/test/cassandra | cut -f 3 -d ' ' | while read -r line;
	do
		sudo umount "$line"
	done

	rm -rf build/test/cassandra
	mkdir -p build/test/cassandra

	sudo mount -t tmpfs -o size=1024M tmpfs "$(pwd)/build/test/cassandra"
else
	echo "Unrecognized OS: $os" 1>&2
	exit 1
fi