alpine-linux-headless-boots.../overlay/etc/local.d/headless.start

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#!/bin/sh
VERSION="0.6"
# Redirect stdout and errors to console as rc.local does not log anything
exec 1>/dev/console 2>&1
logger -st ${0##*/} "Alpine Linux headless bootstrap v$VERSION by macmpi"
mkdir /tmp/.trash
ovlpath=$( find /media -maxdepth 2 -type d -path '*/.*' -prune -o -type f -name *.apkovl.tar.gz -exec dirname {} \; | head -1 )
## Setup Network interfaces
if [ -f "${ovlpath}/wpa_supplicant.conf" ]; then
logger -st ${0##*/} "Wifi setup found !"
apk add wpa_supplicant
install -m600 "${ovlpath}/wpa_supplicant.conf" /etc/wpa_supplicant/wpa_supplicant.conf
else
logger -st ${0##*/} "Wifi setup not found !"
fi
if ! install -m644 "${ovlpath}/interfaces" /etc/network/interfaces; then
# set default interfaces if not specified by interface file on boot storage
logger -st ${0##*/} "No interfaces file supplied, building default interfaces..."
for dev in $(ls /sys/class/net)
do
case ${dev%%[0-9]*} in
lo)
cat <<-EOF >> /etc/network/interfaces
auto $dev
iface $dev inet loopback
EOF
;;
eth)
cat <<-EOF >> /etc/network/interfaces
auto $dev
iface $dev inet dhcp
EOF
;;
wlan)
[ -f /etc/wpa_supplicant/wpa_supplicant.conf ] && cat <<-EOF >> /etc/network/interfaces
auto $dev
iface $dev inet dhcp
EOF
;;
usb)
cat <<-EOF >> /etc/network/interfaces
auto $dev
iface $dev inet static
address 10.42.0.2/24
gateway 10.42.0.1
EOF
cat <<-EOF > /etc/resolv.conf
nameserver 208.67.222.222
nameserver 208.67.220.220
EOF
;;
esac
done
fi
echo "Using following network interfaces:"
cat /etc/network/interfaces
echo "alpine-headless" > /etc/hostname
hostname -F /etc/hostname
grep -q "wlan" /etc/network/interfaces && [ -f /etc/wpa_supplicant/wpa_supplicant.conf ] && rc-service wpa_supplicant start
rc-service networking start
## Setup temporary SSH server (root login, no password)
## we use some bundled or optionaly provided keys to avoid generation at boot and save time
apk add openssh
# bundled temporary keys are moved in RAM /tmp so they won't be stored
# within permanent config later (new ones will then be generated)
mv /etc/ssh/ssh_host_*_key* /tmp/.trash/.
cp /etc/ssh/sshd_config /etc/ssh/sshd_config.orig
cat <<-EOF >> /etc/ssh/sshd_config
AuthenticationMethods none
PermitEmptyPasswords yes
PermitRootLogin yes
EOF
# inject optional custom keys (those might be stored)
if ! install -m600 "${ovlpath}"/ssh_host_*_key* /etc/ssh/; then
echo "HostKey /tmp/.trash/ssh_host_ed25519_key" >> /etc/ssh/sshd_config
echo "HostKey /tmp/.trash/ssh_host_rsa_key" >> /etc/ssh/sshd_config
fi
cp /etc/conf.d/sshd /etc/conf.d/sshd.orig
cat <<-EOF >> /etc/conf.d/sshd
sshd_disable_keygen=yes
EOF
rc-service sshd start
## Prep for final post-cleanup
## clears any installed packages and settings
cat <<-EOF > /tmp/.trash/post-cleanup
#!/bin/sh
logger -st ${0##*/} "Cleaning-up..."
mv /etc/ssh/sshd_config.orig /etc/ssh/sshd_config
mv /etc/conf.d/sshd.orig /etc/conf.d/sshd
apk del openssh
apk del wpa_supplicant
rm -rf /etc/wpa_supplicant
rm /etc/network/interfaces
rm /etc/hostname
rm /etc/modules-load.d/g_ether.conf
rm /etc/modprobe.d/g_ether.conf
rc-update del local default
rm /etc/local.d/headless.start
if [ -f "${ovlpath}/unattended.sh" ]; then
install -m755 "${ovlpath}/unattended.sh" /tmp/unattended.sh
/tmp/unattended.sh >/dev/console 2>&1 &
logger -st ${0##*/} "/tmp/unattended.sh script launched in the background with PID \$!"
fi
logger -st ${0##*/} "Done !!"
EOF
chmod +x /tmp/.trash/post-cleanup
exec /tmp/.trash/post-cleanup