add few code snippets for some unattended actions

sample_unattended.sh

@@ -1,6 +1,85 @@
 #/bin/sh
 
+## collection of few code snippets as sample unnatteded actions some may find usefull
+
+
+## Obvious one; reminder: is run in the background
 echo hello world !!
 sleep 60
+
+########################################################
+
+
+## This snippet removes apkovl file on volume after initial boot
+ovlpath=$( find /media -maxdepth 2 -type d -path '*/.*' -prune -o -type f -name *.apkovl.tar.gz -exec dirname {} \; | head -1 )
+
+# also works in case volume is mounted read-only
+grep -q "${ovlpath}.*[[:space:]]ro[[:space:],]" /proc/mounts; RO=$?
+[ "$RO" -eq "0" ] && mount -o remount,rw "${ovlpath}"
+rm "${ovlpath}"/*.apkovl.tar.gz
+[ "$RO" -eq "0" ] && mount -o remount,ro "${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 -st ${0##*/} "Setting-up minimal environment"
+
+cat <<-EOF > /tmp/ANSWERFILE
+	# base answer file for setup-alpine script
+
+	# Do not set keyboard layout
+	KEYMAPOPTS=none
+
+	# Keep hostname
+	HOSTNAMEOPTS="$(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
+SSH_CONNECTION="FAKE" setup-alpine -ef /tmp/ANSWERFILE
+lbu commit -d
+
+########################################################
+
+
 logger -st ${0##*/} "Finished unattended script"