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