raspap-webgui-mirror/installers/minwrite.sh

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#!/bin/bash
#
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# RaspAP minimal microSD card write operation
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# Original author: @zbchristian
# Original source URI: https://github.com/RaspAP/raspap-tools
# Modified by: @billz <billzimmerman@gmail.com>
# License: GNU General Public License v3.0
# License URI: https://github.com/raspap/raspap-webgui/blob/master/LICENSE
#
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# Limits microSD card write operation to a minimum by moving temporary and log files to RAM.
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# Several packages are removed and the default logging service is replaced.
# The file system is still in read/write mode, so RaspAP settings can be saved.
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# Write access can be checked with "iotop -aoP".
# Remaining access originates mainly from the ext4 journal update (process jbd2).
# Exit on error
set -o errexit
# Exit on error inside functions
set -o errtrace
# Set defaults
readonly bootcmd="/boot/cmdline.txt"
function _install_minwrite() {
_display_welcome
_begin_install
_remove_packages
_disable_services
_install_logger
_disable_swap
_move_directories
_install_complete
}
function _dirs2tmpfs() {
for dir in "${dirs[@]}"; do
echo "Moving $dir to RAM"
if ! grep -q " $dir " /etc/fstab; then
echo "tmpfs $dir tmpfs nosuid,nodev 0 0" | sudo tee -a /etc/fstab
fi
done
}
# Determines host Linux distribution details
function _get_linux_distro() {
if type lsb_release >/dev/null 2>&1; then # linuxbase.org
OS=$(lsb_release -si)
RELEASE=$(lsb_release -sr)
CODENAME=$(lsb_release -sc)
DESC=$(lsb_release -sd)
elif [ -f /etc/os-release ]; then # freedesktop.org
. /etc/os-release
OS=$ID
RELEASE=$VERSION_ID
CODENAME=$VERSION_CODENAME
DESC=$PRETTY_NAME
else
_install_status 1 "Unsupported Linux distribution"
fi
}
function _begin_install() {
_install_log "Modify the OS to minimize microSD card write operation"
_get_linux_distro
echo "Detected OS: ${DESC}"
}
function _remove_packages() {
_install_log "Removing packages"
echo -e "The following packages will be removed: ${ANSI_YELLOW}dphys-swapfile logrotate${ANSI_RESET}"
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echo -n "Proceed? [Y/n]: "
if [ "$assume_yes" == 0 ]; then
read answer < /dev/tty
if [ "$answer" != "${answer#[Nn]}" ]; then
_install_status 0 "(Skipped)"
else
sudo apt-get -y remove --purge dphys-swapfile logrotate || _install_status 1 "Unable to remove packages"
sudo apt-get -y autoremove --purge || _install_status 1 "Unable to autoremove packages"
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_install_status 0
fi
else
echo "(Skipped)"
fi
}
function _disable_services() {
_install_log "Disabling services"
echo -e "The following services will be disabled: ${ANSI_YELLOW}bootlogd.service bootlogs console-setup apt-daily${ANSI_RESET}"
echo -n "Proceed? [Y/n]: "
if [ "$assume_yes" == 0 ]; then
read answer < /dev/tty
if [ "$answer" != "${answer#[Nn]}" ]; then
_install_status 0 "(Skipped)"
else
sudo systemctl unmask bootlogd.service || _install_status 2 "Service bootlogd.service does not exist"
sudo systemctl disable bootlogs || _install_status 2 "Service bootlogs does not exist"
sudo systemctl disable apt-daily.service apt-daily.timer apt-daily-upgrade.timer apt-daily-upgrade.service || _install_status 2 "Service apt-daily does not exist"
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_install_status 0
fi
else
echo "(Skipped)"
fi
}
function _install_logger() {
_install_log "Installing new logger"
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echo -e "The following new logger will be installed: ${ANSI_YELLOW}busybox-syslogd${ANSI_RESET}"
echo -n "Proceed? [Y/n]: "
if [ "$assume_yes" == 0 ]; then
read answer < /dev/tty
if [ "$answer" != "${answer#[Nn]}" ]; then
_install_status 0 "(Skipped)"
else
sudo apt-get -y install busybox-syslogd || _install_status 1 "Unable to install busybox-syslogd"
sudo dpkg --purge rsyslog || _install_status 1 "Unable to purge rsyslog"
_install_status 0
fi
else
echo "(Skipped)"
fi
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}
function _disable_swap() {
_install_log "Modifying boot options to disable swap and filesystem check"
echo "The noswap option will be written to ${bootcmd}"
echo -n "Proceed? [Y/n]: "
if [ "$assume_yes" == 0 ]; then
read answer < /dev/tty
if [ "$answer" != "${answer#[Nn]}" ]; then
_install_status 0 "(Skipped)"
else
if ! grep -q "noswap" $bootcmd; then
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sudo sed -i '1 s/$/ fsck.mode=skip noswap/' $bootcmd || _install_status 1 "Unable to write to ${bootcmd}"
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echo "Modified ${bootcmd} with noswap option"
_install_status 0
fi
fi
else
echo "(Skipped)"
fi
}
function _move_directories() {
_install_log "Add tmpfs entries to /etc/fstab"
# move directories to RAM
dirs=( "/tmp" "/var/log" "/var/tmp" "/var/lib/misc" "/var/cache")
# special dirs used by vnstat and php
dirs+=( "/var/lib/vnstat" "/var/php/sessions" )
echo "The following directories will be moved to RAM:"
echo -e "${ANSI_YELLOW}${dirs[*]}${ANSI_RESET}"
echo -n "Proceed? [Y/n]: "
if [ "$assume_yes" == 0 ]; then
read answer < /dev/tty
if [ "$answer" != "${answer#[Nn]}" ]; then
_install_status 0 "(Skipped)"
else
_dirs2tmpfs || _install_status 1 "Unable to call dirs2tmpfs"
_install_status 0
fi
else
echo "(Skipped)"
fi
}
function _install_complete() {
_install_log "Installation completed"
echo -e "${ANSI_RED}The system needs to be rebooted as a final step.${ANSI_RESET}"
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echo -n "Reboot now? [Y/n]: "
if [ "$assume_yes" == 0 ]; then
read answer < /dev/tty
if [ "$answer" != "${answer#[Nn]}" ]; then
echo "Installation reboot aborted."
exit 0
fi
echo "Rebooting..."
sudo reboot || _install_status 1 "Unable to execute reboot"
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fi
}