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alpine-linux-headless-bootstrap
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version 1.2 

New feature: auto-update apkovl file with latest release on master
gadget: improved setup if several ports available and/or some unconnected
wlan: only install & start wpa_supplicant if needed
updated doc
This commit is contained in:
macmpi 2023-11-23 22:13:27 +01:00
parent 4026274721
commit e7bd00c1df
7 changed files with 189 additions and 114 deletions
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15
README.md
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@ -25,15 +25,18 @@ Extra files may be added next to `headless.apkovl.tar.gz` to customise boostrapp
- `interfaces`[^3] (*optional*): define network interfaces at will, if defaults DCHP-based are not suitable. - `interfaces`[^3] (*optional*): define network interfaces at will, if defaults DCHP-based are not suitable.
- `authorized_keys` (*optional*): provide client's public SSH key to secure `root` ssh login. - `authorized_keys` (*optional*): provide client's public SSH key to secure `root` ssh login.
- `ssh_host_*_key*` (*optional*): provide server's custom ssh keys to be injected (may be stored), instead of using bundled ones[^2] (not stored). Providing an empty key file will trigger new keys generation (ssh server may take longer to start). - `ssh_host_*_key*` (*optional*): provide server's custom ssh keys to be injected (may be stored), instead of using bundled ones[^2] (not stored). Providing an empty key file will trigger new keys generation (ssh server may take longer to start).
- `auto-updt` (*optional*): allow apkovl file automatic update with latest from master branch. If it contains *reboot* keyword all in one line, system will reboot after succesful update (unless ssh session is active or `unattended.sh` script is available).
**Goody:** seamless USB-serial & USB-ethernet gadget mode (PiZero for instance):\
On supporting Pi devices, just add `dtoverlay=dwc2,dr_mode=peripheral` in `usercfg.txt` (or `config.txt`), and plug USB cable into host Computer port.\
Serial terminal can then be connected-to from host Computer (e.g. `cu -l ttyACM0` on Linux. xon/xoff flow control).\
Alternatively, with host Computer set-up to share networking with USB interface as 10.42.0.1 gateway, one can log into device from host with: `ssh root@10.42.0.2`.
Main execution steps are logged: `cat /var/log/messages | grep headless`. Main execution steps are logged: `cat /var/log/messages | grep headless`.
## Goody:
Seamless USB-serial & USB-ethernet gadget mode (*e.g. PiZero*):
- Make sure dwc2/dwc3 driver is loaded accordingly, and device configuration is set to `peripheral` mode: this may be hardware (including cable) and/or software driven.\
(on supporting Pi devices, just add `dtoverlay=dwc2,dr_mode=peripheral` in `usercfg.txt` (or `config.txt`) to force by software)
- Plug USB cable into host Computer port before boot.\
Serial terminal can then be connected-to from host Computer (e.g. `cu -l ttyACM0` on Linux. xon/xoff flow control).\
Alternatively, with host Computer set-up to share networking with USB interface as 10.42.0.1 gateway, one can log into device from host with: `ssh root@10.42.0.2`.
[^1]: Initial boot fully preserves system's original state (config files & installed packages): a fresh system will therefore come-up as unconfigured. [^1]: Initial boot fully preserves system's original state (config files & installed packages): a fresh system will therefore come-up as unconfigured.
[^2]: About bundled ssh keys: this overlay is meant to **quickly bootstrap** system in order to then proceed with proper install; therefore it purposely embeds [some ssh keys](https://github.com/macmpi/alpine-linux-headless-bootstrap/tree/main/overlay/tmp/.trash) so that bootstrapping is as fast as possible. Those temporary keys are moved in RAM /tmp: they will **not be stored/reused** once actual system install is performed (whether or not ssh server is installed in final setup). [^2]: About bundled ssh keys: this overlay is meant to **quickly bootstrap** system in order to then proceed with proper install; therefore it purposely embeds [some ssh keys](https://github.com/macmpi/alpine-linux-headless-bootstrap/tree/main/overlay/tmp/.trash) so that bootstrapping is as fast as possible. Those temporary keys are moved in RAM /tmp: they will **not be stored/reused** once actual system install is performed (whether or not ssh server is installed in final setup).

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headless.apkovl.tar.gz
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1
headless.apkovl.tar.gz.sha512 Normal file
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@ -0,0 +1 @@
003cb6812a4db690db522bb26de14f83d55e2c0b2a8d626a35c90bb9c6cce3181c605f6b51722cd54c712815952faf1072336eb932f80e683748869e27027afb headless.apkovl.tar.gz

3
make.sh
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@ -30,7 +30,8 @@ if [ -n "$build_path" ]; then
doas tar cv -C "$build_path"/overlay --no-recursion \ doas tar cv -C "$build_path"/overlay --no-recursion \
$(doas find "$build_path"/overlay/ | sed "s|$build_path/overlay/||" | sort | xargs ) | \ $(doas find "$build_path"/overlay/ | sed "s|$build_path/overlay/||" | sort | xargs ) | \
gzip -c9n > headless.apkovl.tar.gz gzip -c9n > headless.apkovl.tar.gz
TZ=UTC touch -cm -t "$t_stamp" headless.apkovl.tar.gz sha512sum headless.apkovl.tar.gz > headless.apkovl.tar.gz.sha512
TZ=UTC touch -cm -t "$t_stamp" headless.apkovl.tar.gz*
doas rm -rf "$build_path" doas rm -rf "$build_path"
fi fi

199
overlay/usr/local/bin/headless_bootstrap
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@ -3,7 +3,7 @@
# SPDX-FileCopyrightText: Copyright 2022-2023, macmpi # SPDX-FileCopyrightText: Copyright 2022-2023, macmpi
# SPDX-License-Identifier: MIT # SPDX-License-Identifier: MIT
HDLSBSTRP_VERSION="1.1" HDLSBSTRP_VERSION="1.2"
_apk() { _apk() {
local cmd="$1" local cmd="$1"
@ -27,14 +27,14 @@ _apk() {
} }
_preserve() { _preserve() {
# create a back-up of element (file, folder, symlink) # Create a back-up of element (file, folder, symlink).
[ -z "${1}" ] && return 1 [ -z "${1}" ] && return 1
[ -e "${1}" ] && cp -a "${1}" "${1}".orig [ -e "${1}" ] && cp -a "${1}" "${1}".orig
} }
_restore() { _restore() {
# remove element (file, folder, symlink) and replace by # Remove element (file, folder, symlink) and replace by
# previous back-up if available # previous back-up if available.
[ -z "${1}" ] && return 1 [ -z "${1}" ] && return 1
rm -rf "${1}" rm -rf "${1}"
[ -e "${1}".orig ] && mv -f "${1}".orig "${1}" [ -e "${1}".orig ] && mv -f "${1}".orig "${1}"
@ -46,9 +46,9 @@ alias _logger='logger -st "${0##*/}"'
##### End of part to be duplicated into headless_cleanup (do not alter!) ##### End of part to be duplicated into headless_cleanup (do not alter!)
_prep_cleanup() { _prep_cleanup() {
## Prep for final headless_cleanup ## Prep for final headless_cleanup:
# clears any installed packages and settings # clears any installed packages and settings.
# copy begininng of this file to keep functions # Copy begininng of this file to keep functions.
sed -n '/^#* End .*alter!)$/q;p' /usr/local/bin/headless_bootstrap >/tmp/.trash/headless_cleanup sed -n '/^#* End .*alter!)$/q;p' /usr/local/bin/headless_bootstrap >/tmp/.trash/headless_cleanup
cat <<-EOF >>/tmp/.trash/headless_cleanup cat <<-EOF >>/tmp/.trash/headless_cleanup
# Redirect stdout and errors to console as service won't show messages # Redirect stdout and errors to console as service won't show messages
@ -64,31 +64,32 @@ cat <<-EOF >> /tmp/.trash/headless_cleanup
_restore "/etc/hostname" _restore "/etc/hostname"
rm -f /etc/modprobe.d/headless_gadget.conf rm -f /etc/modprobe.d/headless_gadget.conf
# remove from boot service to avoid spurious openrc recalls from unattended script # Remove from boot service to avoid spurious openrc recalls from unattended script.
rm -f /etc/runlevels/default/headless_bootstrap rm -f /etc/runlevels/default/headless_bootstrap
rm -f /usr/local/bin/headless_bootstrap rm -f /usr/local/bin/headless_bootstrap
# Run unattended script if available # Run unattended script if available.
install -m755 "${ovlpath}"/unattended.sh /tmp/headless_unattended > /dev/null 2>&1 && \ install -m755 ${ovlpath}/unattended.sh /tmp/headless_unattended >/dev/null 2>&1 && \
_logger "Starting headless_unattended service" && \ _logger "Starting headless_unattended service" && \
rc-service headless_unattended start rc-service headless_unattended start
rm -f /etc/init.d/headless_* rm -f /etc/init.d/headless_*
_logger "Clean-up done, enjoy !" _logger "Clean-up done, enjoy !"
cat /tmp/.trash/banner >/dev/console cat /tmp/.trash/banner >/dev/console
if [ -c /dev/ttyGS0 ]; then if [ -c /dev/ttyGS${gdgt_id} ]; then
# Enabling terminal login into ttyGS0 serial for 60 sec # Enabling terminal login into valid serial port:
# no choice than making permanent change to pre 3.19 versions of /etc/securetty # no choice than making permanent change to /etc/securetty (Alpine 3.19 already has ttyGS0).
grep -q "ttyGS0" /etc/securetty || echo "ttyGS0" >> /etc/securetty grep -q "ttyGS${gdgt_id}" /etc/securetty || echo "ttyGS${gdgt_id}" >>/etc/securetty
/sbin/getty -L 115200 ttyGS0 vt100 & /sbin/getty -L 115200 /dev/ttyGS${gdgt_id} vt100 &
fi fi
exit 0
EOF EOF
chmod +x /tmp/.trash/headless_cleanup chmod +x /tmp/.trash/headless_cleanup
} }
_setup_sshd() { _setup_sshd() {
## Setup temporary SSH server (root login, no password) ## Setup temporary SSH server (root login, no password):
# We use some bundled (or optionaly provided) keys to avoid generation at startup and save time # we use some bundled (or optionaly provided) keys to avoid generation at startup and save time.
_apk add openssh-server _apk add openssh-server
_preserve "/etc/ssh/sshd_config" _preserve "/etc/ssh/sshd_config"
_preserve "/etc/conf.d/sshd" _preserve "/etc/conf.d/sshd"
@ -98,7 +99,7 @@ cat <<-EOF > /etc/ssh/sshd_config
Banner /tmp/.trash/banner Banner /tmp/.trash/banner
EOF EOF
# Client authorized_keys or no authentication # Client authorized_keys or no authentication.
if install -m600 "${ovlpath}"/authorized_keys /tmp/.trash/authorized_keys >/dev/null 2>&1; then if install -m600 "${ovlpath}"/authorized_keys /tmp/.trash/authorized_keys >/dev/null 2>&1; then
_logger "Enabling public key SSH authentication..." _logger "Enabling public key SSH authentication..."
cat <<-EOF >>/etc/ssh/sshd_config cat <<-EOF >>/etc/ssh/sshd_config
@ -119,7 +120,7 @@ fi
# or use bundeled ones (not stored) # or use bundeled ones (not stored)
local keygen_stance="sshd_disable_keygen=yes" local keygen_stance="sshd_disable_keygen=yes"
if install -m600 "${ovlpath}"/ssh_host_*_key* /etc/ssh/ >/dev/null 2>&1; then if install -m600 "${ovlpath}"/ssh_host_*_key* /etc/ssh/ >/dev/null 2>&1; then
# check for empty key within injected ones: if found, generate new keys # Check for empty key within injected ones: if found, generate new keys.
if find /etc/ssh/ -maxdepth 1 -type f -name 'ssh_host_*_key*' -empty | grep -q .; then if find /etc/ssh/ -maxdepth 1 -type f -name 'ssh_host_*_key*' -empty | grep -q .; then
rm /etc/ssh/ssh_host_*_key* rm /etc/ssh/ssh_host_*_key*
keygen_stance="" keygen_stance=""
@ -140,42 +141,72 @@ echo "$keygen_stance" >> /etc/conf.d/sshd
rc-service sshd restart rc-service sshd restart
} }
_updt_apkovl() {
## Update apkovl overlay file & eventually reboot
# URL redirects to apkovl file on github master: is.gd shortener provides basic analytics.
# Analytics are public and can be checked at https://is.gd/stats.php?url=apkovl_master
# Privacy policy: https://is.gd/privacy.php
local file_url="https://is.gd/apkovl_master"
local sha_url="https://github.com/macmpi/alpine-linux-headless-bootstrap/raw/main/headless.apkovl.tar.gz.sha512"
local updt_status="failed, keeping original version"
_logger "Updating overlay file..."
if wget -q -O /tmp/apkovl -T 10 "$file_url" >/dev/null 2>&1 && \
wget -q -O /tmp/sha -T 10 "$sha_url" >/dev/null 2>&1 && \
[ "$( sha512sum /tmp/apkovl | awk '{print $1}' )" = "$( awk '{print $1}' /tmp/sha )" ]; then
_is_ro && mount -o remount,rw "${ovlpath}"
cp /tmp/apkovl "${ovl}"
_is_ro && mount -o remount,ro "${ovlpath}"
! [ "$( sha512sum "${ovl}" | awk '{print $1}' )" = "$( awk '{print $1}' /tmp/sha )" ] && \
_logger "Bad update: original apkovl file may be altered, please check!..." && return 1
updt_status="successful"
fi
rm -f /tmp/apkovl /tmp/sha
_logger "Update $updt_status"
[ "$updt_status" = "successful" ] || return 1
# Reboot if specified in auto-updt file (and no ssh session ongoing nor unattended.sh script available).
! pgrep -a -P "$( cat /run/sshd.pid 2>/dev/null )" 2>/dev/null | grep -q "sshd: root@pts" && \
! [ -f "${ovlpath}"/unattended.sh ] && \
grep -q "^reboot$" "${ovlpath}"/auto-updt && \
_logger "Will reboot in 3sec..." && sleep 3 && reboot
exit 0
}
_tst_version() { _tst_version() {
# Tested URL redirects to github project page: is.gd shortener provides basic analytics. ## Compare current version with latest online, notify & eventally calls for update
# URL redirects to github project page: is.gd shortener provides basic analytics.
# Analytics are public and can be checked at https://is.gd/stats.php?url=apkovl_run # Analytics are public and can be checked at https://is.gd/stats.php?url=apkovl_run
# Privacy policy: https://is.gd/privacy.php # Privacy policy: https://is.gd/privacy.php
local new_vers="" local new_vers=""
local status="failed"
local ref="/macmpi/alpine-linux-headless-bootstrap/releases/tag/v" local ref="/macmpi/alpine-linux-headless-bootstrap/releases/tag/v"
if wget -q -O /tmp/homepg -T 10 https://is.gd/apkovl_run > /dev/null 2>&1; then local url="https://is.gd/apkovl_run"
status="success"
if wget -q -O /tmp/homepg -T 10 "$url" >/dev/null 2>&1; then
_logger "Internet access: success"
ver="$( grep -o "$ref.*\"" /tmp/homepg | grep -Eo '[0-9]+[\.[0-9]+]*' )" ver="$( grep -o "$ref.*\"" /tmp/homepg | grep -Eo '[0-9]+[\.[0-9]+]*' )"
rm -f /tmp/homepg rm -f /tmp/homepg
[ -n "$ver" ] && ! [ "$ver" = "$HDLSBSTRP_VERSION" ] && \ if [ -n "$ver" ] && ! [ "$ver" = "$HDLSBSTRP_VERSION" ]; then
new_vers="!! Version $ver is available on Github project page !!" && \ new_vers="!! Version $ver is available on Github project page !!"
_logger "$new_vers" && \ _logger "$new_vers"
printf '%s\n\n' "$new_vers" >>/tmp/.trash/banner printf '%s\n\n' "$new_vers" >>/tmp/.trash/banner
# Optionally update apkovl if key-file allows it.
[ -f "${ovlpath}"/auto-updt ] && _updt_apkovl &
fi
else
_logger "Internet access: failed"
fi fi
_logger "Internet access: $status"
} }
_setup_networking() { _setup_networking() {
## Setup Network interfaces ## Setup network interfaces.
local has_wifi local has_wifi wlan_lst
_has_wifi() { return "$has_wifi"; } _has_wifi() { return "$has_wifi"; }
find /sys/class/ieee80211/*/device/net/* -maxdepth 0 -type d -exec basename {} \; > /tmp/.wlan_list 2>/dev/null wlan_lst="$( find /sys/class/net/*/phy80211 -exec \
[ -s /tmp/.wlan_list ] && [ -f "${ovlpath}"/wpa_supplicant.conf ] sh -c 'printf %s\| "$( basename "$( dirname "$0" )" )"' {} \; 2>/dev/null )"
wlan_lst="${wlan_lst%\|}"
[ -n "$wlan_lst" ] && [ -f "${ovlpath}"/wpa_supplicant.conf ]
has_wifi=$? has_wifi=$?
if _has_wifi; then
_logger "Configuring wifi..."
_apk add wpa_supplicant
_preserve "/etc/wpa_supplicant/wpa_supplicant.conf"
install -m600 "${ovlpath}"/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf
rc-service wpa_supplicant restart
else
_logger "No wifi interface or SSID/pass file supplied"
fi
_preserve "/etc/network/interfaces" _preserve "/etc/network/interfaces"
if ! install -m644 "${ovlpath}"/interfaces /etc/network/interfaces >/dev/null 2>&1; then if ! install -m644 "${ovlpath}"/interfaces /etc/network/interfaces >/dev/null 2>&1; then
@ -186,7 +217,7 @@ if ! install -m644 "${ovlpath}"/interfaces /etc/network/interfaces > /dev/null 2
EOF EOF
for dev in /sys/class/net/*; do for dev in /sys/class/net/*; do
# shellcheck disable=SC2034 # Unused IFINDEX while still sourced from uevent # shellcheck disable=SC2034 # Unused IFINDEX while still sourced from uevent.
local DEVTYPE INTERFACE IFINDEX local DEVTYPE INTERFACE IFINDEX
DEVTYPE="" DEVTYPE=""
# shellcheck source=/dev/null # shellcheck source=/dev/null
@ -202,13 +233,19 @@ if ! install -m644 "${ovlpath}"/interfaces /etc/network/interfaces > /dev/null 2
EOF EOF
;; ;;
*) *)
_has_wifi && grep -q "$INTERFACE" /tmp/.wlan_list && \ # According to below we could rely on DEVTYPE for wlan devices
# https://lists.freedesktop.org/archives/systemd-devel/2014-January/015999.html
# but...some wlan might still be ill-behaved: use wlan_lst
# shellcheck disable=SC2169 # ash does support string replacement.
_has_wifi && ! [ "${wlan_lst/$INTERFACE/}" = "$wlan_lst" ] && \
cat <<-EOF >>/etc/network/interfaces cat <<-EOF >>/etc/network/interfaces
auto $INTERFACE auto $INTERFACE
iface $INTERFACE inet dhcp iface $INTERFACE inet dhcp
EOF EOF
# Ensure considered gadget interface is actually the connected one (may have several).
[ "$DEVTYPE" = "gadget" ] && \ [ "$DEVTYPE" = "gadget" ] && \
find /sys/class/udc/*/device/gadget."${gdgt_id}"/net/"$INTERFACE" -maxdepth 0 >/dev/null 2>&1 && \
cat <<-EOF >>/etc/network/interfaces && cat <<-EOF >/etc/resolv.conf cat <<-EOF >>/etc/network/interfaces && cat <<-EOF >/etc/resolv.conf
auto $INTERFACE auto $INTERFACE
iface $INTERFACE inet static iface $INTERFACE inet static
@ -230,35 +267,53 @@ echo "Using following network interfaces:"
cat /etc/network/interfaces cat /etc/network/interfaces
echo "###################################" echo "###################################"
if _has_wifi && grep -qE "$wlan_lst" /etc/network/interfaces; then
_logger "Configuring wifi..."
_apk add wpa_supplicant
_preserve "/etc/wpa_supplicant/wpa_supplicant.conf"
install -m600 "${ovlpath}"/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf
rc-service wpa_supplicant restart
else
_logger "No wifi interface or SSID/pass file supplied"
fi
_preserve "/etc/hostname" _preserve "/etc/hostname"
echo "alpine-headless" >/etc/hostname echo "alpine-headless" >/etc/hostname
hostname -F /etc/hostname hostname -F /etc/hostname
rc-service networking restart rc-service networking restart
rm -f /tmp/.wlan_list
} }
_setup_gadget() { _setup_gadget() {
## load composite USB Serial/USB Ethernel driver & setup terminal ## Load composite USB Serial/USB Ethernel driver & setup terminal.
_logger "Enabling USB-gadget Serial and Ethernet ports" _logger "Enabling USB-gadget Serial and Ethernet ports"
lsmod | grep -q "dwc2" || modprobe -qs dwc2 # Remove conflicting modules in case they were initially loaded (cmdline.txt).
# remove conflicting modules in case they were initially loaded (cmdline.txt) modprobe -r g_serial g_ether g_cdc
modprobe -rq g_serial g_ether g_cdc modprobe g_cdc
modprobe -q g_cdc && sleep 1 # Wait for g_cdc to settle and serial ports become available
# once driver has settled check if cable is connected: unload if not timeout 1 sh <<-EOF
[ "$( cat "$udc_gadget"/current_speed )" = "UNKNOWN" ] && \ while ! grep -q "ttyGS" /proc/devices; do sleep 0.2; done
_logger "USB cable not connected !!" && modprobe -rq g_cdc && return 1 EOF
# default serial config: xon/xoff flow control # Determine which gadget ID is connected with USB cable (assume just one max).
stty -g -F /dev/ttyGS0 >/dev/null 2>&1 # (setting console to unconnected serial port would block boot)
# notes to users willing to connect from Linux Ubuntu-based host terminal: gdgt_id="$( find /sys/class/udc/*/current_speed -exec \
sh -c 'grep -vq "UNKNOWN" "$0" && find ${0/current_speed/}device/gadget.* -maxdepth 0' {} \; \
| sed 's/\/.*gadget\.//' )"
if [ -c /dev/ttyGS"${gdgt_id}" ]; then
# Default serial config: xon/xoff flow control.
stty -F /dev/ttyGS"${gdgt_id}"
setconsole /dev/ttyGS"${gdgt_id}"
# Notes to users willing to connect from Linux Ubuntu-based host terminal:
# - user on host needs to be part of dialout group (reboot required), and # - user on host needs to be part of dialout group (reboot required), and
# - disable spurious AT commands from ModemManager on host-side Gadget serial port # - disable spurious AT commands from ModemManager on host-side Gadget serial port
# you may create a /etc/udev/rules.d/99-ttyacms-gadget.rules as per: # one may create a /etc/udev/rules.d/99-ttyacms-gadget.rules as per:
# https://linux-tips.com/t/prevent-modem-manager-to-capture-usb-serial-devices/284/2 # https://linux-tips.com/t/prevent-modem-manager-to-capture-usb-serial-devices/284/2
# ATTRS{idVendor}=="0525" ATTRS{idProduct}=="a4aa", ENV{ID_MM_DEVICE_IGNORE}="1" # ATTRS{idVendor}=="0525" ATTRS{idProduct}=="a4aa", ENV{ID_MM_DEVICE_IGNORE}="1"
else
setconsole /dev/ttyGS0 _logger "USB-gadget port not connected !"
modprobe -r g_cdc
fi
} }
@ -269,30 +324,34 @@ setconsole /dev/ttyGS0
exec 1>/dev/console 2>&1 exec 1>/dev/console 2>&1
_logger "Alpine Linux headless bootstrap v$HDLSBSTRP_VERSION by macmpi" _logger "Alpine Linux headless bootstrap v$HDLSBSTRP_VERSION by macmpi"
# help randomness for wpa_supplicant and sshd (urandom until 3.16) # Help randomness for wpa_supplicant and sshd (urandom until 3.16).
rc-service seedrng restart || rc-service urandom restart rc-service seedrng restart || rc-service urandom restart
# setup USB gadget mode if such device mode is enabled # Setup USB gadget ports if some ports are enabled in peripheral mode.
udc_gadget="$( dirname "$( find -L /sys/class/udc/* -maxdepth 2 -type f -name "is_a_peripheral" 2>/dev/null)" )" # Note: we assume dwc2/dwc3 is pre-loaded, we just check mode.
[ "$( cat "$udc_gadget"/is_a_peripheral 2>/dev/null )" = "0" ] && \ gdgt_id=""
find /sys/class/udc/*/is_a_peripheral -print0 2>/dev/null | \
xargs -0 cat 2>/dev/null | grep -q "0" && \
_setup_gadget _setup_gadget
# Determine ovl file location # Determine ovl file location.
# grab used ovl filename from dmesg # Grab used ovl filename from dmesg.
ovl="$( dmesg | grep -o 'Loading user settings from .*:' | awk '{print $5}' | sed 's/:.*$//' )" ovl="$( dmesg | grep -o 'Loading user settings from .*:' | awk '{print $5}' | sed 's/:.*$//' )"
if [ -f "${ovl}" ]; then if [ -f "${ovl}" ]; then
ovlpath="$( dirname "$ovl" )" ovlpath="$( dirname "$ovl" )"
else else
# search path again as mountpoint have been changed later in the boot process... # Search path again as mountpoint have been changed later in the boot process...
ovl="$( basename "${ovl}" )" ovl="$( basename "${ovl}" )"
ovlpath=$( find /media -maxdepth 2 -type d -path '*/.*' -prune -o -type f -name "${ovl}" -exec dirname {} \; | head -1 ) ovlpath=$( find /media -maxdepth 2 -type d -path '*/.*' -prune -o -type f -name "${ovl}" -exec dirname {} \; | head -1 )
ovl="${ovlpath}/${ovl}" ovl="${ovlpath}/${ovl}"
fi fi
# Create banner file # Create banner file.
warn="" warn=""
grep -q "${ovlpath}.*[[:space:]]ro[[:space:],]" /proc/mounts; RO=$? grep -q "${ovlpath}.*[[:space:]]ro[[:space:],]" /proc/mounts; is_ro=$?
[ "$RO" -eq "0" ] && warn="(remount partition rw!)" _is_ro() { return "$is_ro"; }
_is_ro && warn="(remount partition rw!)"
cat <<-EOF >/tmp/.trash/banner cat <<-EOF >/tmp/.trash/banner
Alpine Linux headless bootstrap v$HDLSBSTRP_VERSION by macmpi Alpine Linux headless bootstrap v$HDLSBSTRP_VERSION by macmpi
@ -306,11 +365,11 @@ cat <<-EOF > /tmp/.trash/banner
_setup_networking _setup_networking
# Test latest available version online # Test latest available version online.
# Can be skipped by creating a 'opt-out'-named dummy file aside apkovl file # Can be skipped by creating a 'opt-out'-named dummy file aside apkovl file.
[ -f "${ovlpath}"/opt-out ] || _tst_version & [ -f "${ovlpath}"/opt-out ] || _tst_version &
# setup sshd unless unattended.sh script prevents it # Setup sshd unless unattended.sh script prevents it.
grep -q "^#NO_SSH$" "${ovlpath}"/unattended.sh >/dev/null 2>&1 \ grep -q "^#NO_SSH$" "${ovlpath}"/unattended.sh >/dev/null 2>&1 \
|| _setup_sshd || _setup_sshd

10
sample_auto-updt Normal file
View File

@ -0,0 +1,10 @@
# SPDX-FileCopyrightText: Copyright 2022-2023, macmpi
# SPDX-License-Identifier: MIT
# Automated reboot after update is cancelled if:
# - there is an opened ssh session
# - unattended.sh script is provided
# Uncomment line below to enable reboot after update
#reboot

7
sample_unattended.sh
View File

@ -37,10 +37,11 @@ else
fi fi
# also works in case volume is mounted read-only # also works in case volume is mounted read-only
grep -q "${ovlpath}.*[[:space:]]ro[[:space:],]" /proc/mounts; RO=$? grep -q "${ovlpath}.*[[:space:]]ro[[:space:],]" /proc/mounts; is_ro=$?
[ "$RO" -eq "0" ] && mount -o remount,rw "${ovlpath}" _is_ro() { return "$is_ro"; }
_is_ro && mount -o remount,rw "${ovlpath}"
rm -f "${ovl}" rm -f "${ovl}"
[ "$RO" -eq "0" ] && mount -o remount,ro "${ovlpath}" _is_ro && mount -o remount,ro "${ovlpath}"
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