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enable-desktop-switching-lightdm.sh
executable file
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enable-desktop-switching-lightdm.sh
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#!/usr/bin/env bash
# Script that enables desktop session switching and disables autologin for LightDM.
LIGHTDM_GTK_GREETER_FILE='/etc/lightdm/lightdm-gtk-greeter.conf'
LIGHTDM_AUTOLOGIN_FILE='/etc/lightdm/lightdm.conf.d/22-armbian-autologin.conf'
# You need root permissions to run this script.
if [[ "${UID}" != '0' ]]; then
echo '> You need to become root to run this script.'
echo '> Aborting.'
exit 1
fi
# Function that checks if required binary exists and installs it if necessary.
ENSURE_PACKAGE () {
REQUIRED_BINARY=$(basename "${1}")
REPO_PACKAGES="${*:2}"
if [[ "${REQUIRED_BINARY}" != '-' ]]; then
[[ -n "${REPO_PACKAGES}" ]] || REPO_PACKAGES="${REQUIRED_BINARY}"
if command -v "${REQUIRED_BINARY}" 1> /dev/null; then
REPO_PACKAGES=''
fi
fi
[[ -n "${REPO_PACKAGES}" ]] || return
if [[ "${REPO_REFRESHED}" == '0' ]]; then
apt update 1> /dev/null
REPO_REFRESHED=1
fi
for REPO_PACKAGE in ${REPO_PACKAGES}
do
apt install -y "${REPO_PACKAGE}"
done
}
# Variable that keeps track if repository is already refreshed.
REPO_REFRESHED=0
# Install packages if necessary.
ENSURE_PACKAGE 'sed'
ENSURE_PACKAGE 'grep'
# Generate backup file if it doesn't exist.
[[ -f "${LIGHTDM_GTK_GREETER_FILE}.bak" ]] || cp "${LIGHTDM_GTK_GREETER_FILE}" "${LIGHTDM_GTK_GREETER_FILE}.bak"
# Change indicators line in configuration file.
if ! grep -Fq '~session' "${LIGHTDM_GTK_GREETER_FILE}"; then
echo replace
sed -i 's/^indicators = .*$/indicators = ~language;~session;~power;~a11y/' "${LIGHTDM_GTK_GREETER_FILE}"
fi
# Disable autologin.
[[ ! -f "${LIGHTDM_AUTOLOGIN_FILE}" ]] || mv "${LIGHTDM_AUTOLOGIN_FILE}" "${LIGHTDM_AUTOLOGIN_FILE}.bak"
# Let user know that script has finished its job.
echo '> Finished.'