Create _install_minwrite() + functions
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billz
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#!/bin/bash
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#
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# RaspAP minimal microSD card write opartion
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# Original author: @zbchristian
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# Original source URI: https://github.com/RaspAP/raspap-tools
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# Modified by: @billz <billzimmerman@gmail.com>
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# License: GNU General Public License v3.0
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# License URI: https://github.com/raspap/raspap-webgui/blob/master/LICENSE
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#
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# Limits the microSD card write operation to a minimum by moving temporary and log files to RAM.
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# Write access can be checked with "iotop -aoP".
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# Remaining access originates mainly from the ext4 journal update (process jbd2).
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# Exit on error
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set -o errexit
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# Exit on error inside functions
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set -o errtrace
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# Set defaults
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readonly bootcmd="/boot/cmdline.txt"
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function _install_minwrite() {
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_display_welcome
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_begin_install
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_remove_packages
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_disable_services
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_install_logger
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_disable_swap
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_move_directories
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_install_complete
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}
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function _dirs2tmpfs() {
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for dir in "${dirs[@]}"; do
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echo "Moving $dir to RAM"
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if ! grep -q " $dir " /etc/fstab; then
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echo "tmpfs $dir tmpfs nosuid,nodev 0 0" | sudo tee -a /etc/fstab
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fi
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done
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}
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# Determines host Linux distribution details
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function _get_linux_distro() {
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if type lsb_release >/dev/null 2>&1; then # linuxbase.org
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OS=$(lsb_release -si)
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RELEASE=$(lsb_release -sr)
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CODENAME=$(lsb_release -sc)
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DESC=$(lsb_release -sd)
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elif [ -f /etc/os-release ]; then # freedesktop.org
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. /etc/os-release
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OS=$ID
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RELEASE=$VERSION_ID
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CODENAME=$VERSION_CODENAME
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DESC=$PRETTY_NAME
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else
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_install_status 1 "Unsupported Linux distribution"
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fi
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}
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function _begin_install() {
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_install_log "Modify the OS to minimize microSD card write operation"
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_get_linux_distro
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echo "Detected OS: ${DESC}"
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}
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function _remove_packages() {
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_install_log "Removing packages"
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echo -e "The following packages will be removed: ${ANSI_YELLOW}triggerhappy dphys-swapfile logrotate${ANSI_RESET}"
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echo -n "Proceed? [Y/n]: "
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if [ "$assume_yes" == 0 ]; then
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read answer < /dev/tty
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if [ "$answer" != "${answer#[Nn]}" ]; then
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_install_status 0 "(Skipped)"
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else
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sudo apt -y remove --purge triggerhappy dphys-swapfile logrotate || _install_status 1 "Unable to remove packages"
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sudo apt -y autoremove --purge || _install_status 1 "Unable to autoremove packages"
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_install_status 0
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fi
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else
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echo "(Skipped)"
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fi
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}
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function _disable_services() {
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_install_log "Disabling services"
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echo -e "The following services will be disabled: ${ANSI_YELLOW}bootlogd.service bootlogs console-setup apt-daily${ANSI_RESET}"
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echo -n "Proceed? [Y/n]: "
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if [ "$assume_yes" == 0 ]; then
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read answer < /dev/tty
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if [ "$answer" != "${answer#[Nn]}" ]; then
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_install_status 0 "(Skipped)"
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else
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sudo systemctl unmask bootlogd.service || _install_status 1 "Unable to disable bootlogd.service"
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sudo systemctl disable bootlogs || _install_status 1 "Unable to disable bootlogs"
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sudo systemctl disable console-setup || _install_status 1 "Unable to disable console-setup"
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sudo systemctl disable apt-daily.service apt-daily.timer apt-daily-upgrade.timer apt-daily-upgrade.service || _install_status 1 "Unable to disable apt-daily"
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_install_status 0
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fi
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else
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echo "(Skipped)"
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fi
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}
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function _install_logger() {
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_install_log "Installing new logger"
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echo -e "The new logger will be installed: ${ANSI_YELLOW}busybox-syslogd${ANSI_RESET}"
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sudo apt-get -y install busybox-syslogd || _install_status 1 "Unable to install busybox-syslogd"
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sudo dpkg --purge rsyslog || _install_status 1 "Unable to purge rsyslog"
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_install_status 0
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}
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function _disable_swap() {
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_install_log "Modifying boot options to disable swap and filesystem check"
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echo "The noswap option will be written to ${bootcmd}"
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echo -n "Proceed? [Y/n]: "
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if [ "$assume_yes" == 0 ]; then
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read answer < /dev/tty
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if [ "$answer" != "${answer#[Nn]}" ]; then
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_install_status 0 "(Skipped)"
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else
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# disable swap
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if ! grep -q "noswap" $bootcmd; then
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echo "Modified ${bootcmd} with noswap option"
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sudo sed -i '1 s/$/ fsck.mode=skip noswap/' /boot/cmdline.txt || _install_status 1 "Unable to write to ${bootcmd}"
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_install_status 0
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fi
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fi
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else
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echo "(Skipped)"
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fi
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}
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function _move_directories() {
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_install_log "Add tmpfs entries to /etc/fstab"
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# move directories to RAM
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dirs=( "/tmp" "/var/log" "/var/tmp" "/var/lib/misc" "/var/cache")
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# special dirs used by vnstat and php
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dirs+=( "/var/lib/vnstat" "/var/php/sessions" )
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echo "The following directories will be moved to RAM:"
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echo -e "${ANSI_YELLOW}${dirs[*]}${ANSI_RESET}"
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echo -n "Proceed? [Y/n]: "
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if [ "$assume_yes" == 0 ]; then
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read answer < /dev/tty
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if [ "$answer" != "${answer#[Nn]}" ]; then
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_install_status 0 "(Skipped)"
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else
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_dirs2tmpfs || _install_status 1 "Unable to call dirs2tmpfs"
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_install_status 0
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fi
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else
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echo "(Skipped)"
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fi
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}
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function _install_complete() {
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_install_log "Installation completed"
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echo -e "${ANSI_RED}A system reboot should be performed now${ANSI_RESET}"
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echo -n "Reboot now? [Y/n]: "
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if [ "$assume_yes" == 0 ]; then
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read answer < /dev/tty
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if [ "$answer" != "${answer#[Nn]}" ]; then
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echo "Installation reboot aborted."
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exit 0
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fi
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echo "Rebooting..."
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sudo shutdown -r now || _install_status 1 "Unable to execute shutdown"
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fi
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}
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