Rename, refactor uncloud-init
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2 changed files with 76 additions and 105 deletions
105
ucloud-init.sh
105
ucloud-init.sh
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#!/bin/sh
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# Some Global Variables
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ssh_authorized_keys_path='/root/.ssh/authorized_keys'
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ssh_config_path='/etc/ssh/ssh_config'
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sshd_config_path='/etc/ssh/sshd_config'
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etc_resolv_path='/etc/resolv.conf'
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# Functions
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get_distro() {
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OS=$(cat /etc/*release | grep ID | head -1 | cut -c 4-)
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echo $OS
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}
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setup_ssh() {
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tput setaf 2; tput bold; echo "Setting up SSH"; tput sgr0;
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mkdir -p $(dirname $ssh_authorized_keys_path)
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touch $ssh_authorized_keys_path
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if ! grep -q "PasswordAuthentication no" $sshd_config_path; then
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echo "PasswordAuthentication no" >> $sshd_config_path
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fi
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if ! grep -q "PermitRootLogin yes" $sshd_config_path; then
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echo "PermitRootLogin yes" >> $sshd_config_path
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fi
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# TODO: Make sure to replace the following address with http://metadata
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# whenever we got http://metadata resolving to url work successfully.
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metadata=$(curl -s http://metadata)
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echo "$metadata" | jq -r '.["ssh-keys"] | .[]' > ssh-key-list.txt
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while read ssh_key; do
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if ! grep -q "$ssh_key" $ssh_authorized_keys_path; then
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echo $ssh_key >> $ssh_authorized_keys_path
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fi
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done < ssh-key-list.txt
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rm -f ssh-key-list.txt
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service -q sshd restart
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}
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grow_partition() {
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tput setaf 2; tput bold; echo "Growing Partition"; tput sgr0;
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# TODO: Try to replace the growpart to parted
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sh growpart -q /dev/vda 3 > /dev/null;
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}
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make_script_verbose() {
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# Show output of this script
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if [[ ! -e /etc/conf.d/local ]] && ! grep -q "rc_verbose=yes" /etc/conf.d/local; then
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echo "rc_verbose=yes" >> /etc/conf.d/local
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fi
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}
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setup_dns() {
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tput setaf 2; tput bold; echo "Setting up DNS"; tput sgr0;
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# Check if rdnssd is installed, if not put Google's DNS
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# into /etc/resolv.conf and install rdnssd for the next time
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if ! apk list | grep -q ndisc6; then
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echo "nameserver 2001:4860:4860::8888" >> $etc_resolv_path
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echo "nameserver 2001:4860:4860::8844" >> $etc_resolv_path
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echo "nameserver 8.8.8.8" >> $etc_resolv_path
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echo "nameserver 8.8.4.4" >> $etc_resolv_path
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fi
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}
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# Main Code Starts here
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# Change dir to current dir
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cd "$(dirname "$0")"
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make_script_verbose
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setup_dns
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# Initial Package Installation
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if [[ $(get_distro) = "alpine" ]]; then
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tput setaf 2; tput bold; echo "Installing/Updating/Upgrading Packages"; tput sgr0;
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edge_package_flags='--update-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ --allow-untrusted'
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apk update -q
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apk upgrade
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apk add -q ndisc6 $edge_package_flags
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apk add -q openssh-server sfdisk util-linux jq curl ncurses
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else
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echo "Unsupported OS"
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exit 1
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fi
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rc-update -q add rdnssd
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service -q rdnssd start
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setup_ssh
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grow_partition
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76
uncloud-init
Executable file
76
uncloud-init
Executable file
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@ -0,0 +1,76 @@
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#!/bin/sh
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#
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# Initialize an uncloud VM. This script depends on:
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# curl grep getent (i.e. glibc) curl,dirname (i.e. coreutils)
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###
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# TODO: handle command-line parameters.
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DEPLOY_SSH_AUTHORIZED_KEYS=1
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OVERRIDE_EXISTING_SSH_AUTHORIZED_KEYS=0
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GROW_ROOT_PARTITION=0
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SSH_USER=root
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SSH_DAEMON_CONFIG=/etc/ssh/sshd_config
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UNCLOUD_METADATA_SERVER=https://key.wf
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###
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# SSH key deployment logic.
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deploy_ssh_authorized_keys () {
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# Ensure SSHD configuration can be found.
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if [ ! -f "$SSH_DAEMON_CONFIG" ]; then
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echo "Could not find SSHD configuration at $SSH_DAEMON_CONFIG" >&2
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exit 1
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fi
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# Ensure that login is not prevented by SSHD configuration.
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if [ "$SSH_USER" = "root" ]; then
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if grep -q -e "^PermitRootLogin no$" "$SSH_DAEMON_CONFIG"; then
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echo "PermitRootLogin yes" >> "$SSH_DAEMON_CONFIG"
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fi
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fi
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# Get home directory of SSH_USER.
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homedir=$(getent passwd "$SSH_USER" | cut -d: -f6)
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if [ $? != 0 ]; then
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echo "Could not resolve user $SSH_USER." >&2
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exit 1
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fi
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# Fetch and deploy SSH keys from metadata server.
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authorized_keys_file="$homedir/.ssh/authorized_keys"
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mkdir -p $(dirname "$authorized_keys_file")
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if [ -f "$authorized_keys_file" ] \
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&& if [ ! $OVERRIDE_EXISTING_SSH_AUTHORIZED_KEYS ];
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echo "Aborting SSH key deployement to not override existing $authorized_keys_file."
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echo "You can change this behavior with the OVERRIDE_EXISTING_SSH_AUTHORIZED_KEYS flag."
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return
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fi
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curl "$METDATA_SERVER/fnux" --output $authorized_keys_file
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}
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###
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# Partition/filesystem growth logic.
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grow_root_partition () {
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# TODO
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}
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###
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# Entrypoint.
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if [ $DEPLOY_SSH_AUTHORIZED_KEYS ]; then
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routine='SSH authorized_keys deployment routine'
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echo "--- RUNNING $routine..."
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deploy_ssh_authorized_keys()
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echo "--- DONE with $routine."
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fi
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if [ $GROW_ROOT_PARTITION ]: then
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routine='SSH authorized_keys deployment routine'
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echo "--- RUNNING $routine..."
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grow_root_partition()
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echo "--- DONE with $routine."
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fi
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