alpine-linux-headless-boots.../sample_unattended.sh

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#!/bin/sh
# SPDX-FileCopyrightText: Copyright 2022-2023, macmpi
# SPDX-License-Identifier: MIT
## collection of few code snippets as sample unnatteded actions some may find usefull
## will run encapusated within headless_unattended OpenRC service
# To prevent headless bootstrap script from starting sshd
# only keep a single starting # on the line below
##NO_SSH
# Uncomment to enable stdout and errors redirection to console (service won't show messages)
# exec 1>/dev/console 2>&1
# shellcheck disable=SC2142 # known special case
alias _logger='logger -st "${0##*/}"'
## Obvious one; reminder: is run as background service
_logger "hello world !!"
sleep 60
_logger "Finished script"
########################################################
## This snippet removes apkovl file on volume after initial boot
# grab used ovl filename from dmesg
ovl="$( dmesg | grep -o 'Loading user settings from .*:' | awk '{print $5}' | sed 's/:.*$//' )"
if [ -f "${ovl}" ]; then
ovlpath="$( dirname "$ovl" )"
else
# search path again as mountpoint have been changed later in the boot process...
ovl="$( basename "${ovl}" )"
ovlpath=$( find /media -maxdepth 2 -type d -path '*/.*' -prune -o -type f -name "${ovl}" -exec dirname {} \; | head -1 )
ovl="${ovlpath}/${ovl}"
fi
# also works in case volume is mounted read-only
grep -q "${ovlpath}.*[[:space:]]ro[[:space:],]" /proc/mounts; is_ro=$?
_is_ro() { return "$is_ro"; }
_is_ro && mount -o remount,rw "${ovlpath}"
rm -f "${ovl}"
_is_ro && mount -o remount,ro "${ovlpath}"
########################################################
## This snippet configures Minimal diskless environment
# note: with INTERFACESOPTS=none, no networking will be setup so it won't work after reboot!
# Change it or run setup-interfaces in interractive mode afterwards (and lbu commit -d thenafter)
_logger "Setting-up minimal environment"
cat <<-EOF > /tmp/ANSWERFILE
# base answer file for setup-alpine script
# Do not set keyboard layout
KEYMAPOPTS=none
# Keep hostname
HOSTNAMEOPTS="$(hostname)"
# Set device manager to mdev
DEVDOPTS=mdev
# Contents of /etc/network/interfaces
INTERFACESOPTS=none
# Set Public nameserver
DNSOPTS="-n 208.67.222.222"
# Set timezone to UTC
TIMEZONEOPTS="UTC"
# set http/ftp proxy
PROXYOPTS=none
# Add first mirror (CDN)
APKREPOSOPTS="-1"
# Do not create any user
USEROPTS=none
# No Openssh
SSHDOPTS=none
# Use openntpd
NTPOPTS="chrony"
# No disk install (diskless)
DISKOPTS=none
# Setup storage for diskless (find boot directory in /media/xxxx/apk/.boot_repository)
LBUOPTS="$( find /media -maxdepth 3 -type d -path '*/.*' -prune -o -type f -name '.boot_repository' -exec dirname {} \; | head -1 | xargs dirname )"
APKCACHEOPTS="\$LBUOPTS/cache"
EOF
# trick setup-alpine to pretend existing SSH connection
# and therefore keep (do not reset) network interfaces while running in background
# requires alpine-conf 3.15.1 and later, available from Alpine 3.17
SSH_CONNECTION="FAKE" setup-alpine -ef /tmp/ANSWERFILE
lbu commit -d
########################################################
_logger "Finished unattended script"