ram-mozilla-config.service

[Unit]
Description=Mozilla config dir to ram for user %u

[Service]
Type=oneshot
RemainAfterExit=yes
Environment=HOME_CONFIG_DIR=%h/.mozilla
Environment=RAM_DIR=%t/mozilla

ExecStartPre=/bin/sh -c "test -d ${HOME_CONFIG_DIR} || (rm -f ${HOME_CONFIG_DIR} ; mv ${HOME_CONFIG_DIR}.bak ${HOME_CONFIG_DIR})"
ExecStartPre=-/bin/mkdir ${RAM_DIR}
ExecStartPre=/bin/mv ${HOME_CONFIG_DIR} ${HOME_CONFIG_DIR}.bak

ExecStart=/bin/ln -s ${RAM_DIR}/config ${HOME_CONFIG_DIR} ; /bin/cp -a ${HOME_CONFIG_DIR}.bak ${RAM_DIR}/config

ExecStop=/usr/bin/rsync --delete -rl ${RAM_DIR}/config/ ${HOME_CONFIG_DIR}.bak
ExecStopPost=/usr/bin/unlink ${HOME_CONFIG_DIR}
ExecStopPost=/bin/mv ${HOME_CONFIG_DIR}.bak ${HOME_CONFIG_DIR}
ExecStopPost=/bin/rm -r ${RAM_DIR}/config
ExecStopPost=-/bin/rmdir ${RAM_DIR}

[Install]
WantedBy=cache.target